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Architectures of zeolitic imidazolate framework derived Cu2Se/ZnSe@NPC and Cu1.95Se@NPC nanoparticles as anode materials for sodium-ion and lithium-ion batteries
(Elsevier, 2025) Bugday, Nesrin; Huang, Jiangnan; Deng, Wentao; Zou, Guoqiang; Hou, Hongshuai; Ji, Xiaobo; Yasar, Sedat
Transition metal selenides (TMSes) face challenges such as low electronic conductivity, significant volume expansion, and particle agglomeration during charge and discharge processes, limiting their practical application in batteries. A promising solution involves integrating a carbon matrix into TMS-based anodes, which can enhance conductivity and mitigate volume stress. In this study, we synthesized novel Cu Se/ZnSe@NPC and Cu Se@NPC nanoparticles, embedded in a nitrogen-doped porous carbon (NPC) network using zeolitic imidazolate framework-11 (ZIF-11) as a template, for the first time as anode materials in lithium-ion (LIBs) and sodium-ion batteries (SIBs). The Cu Se/ZnSe@NPC and Cu Se@NPC nanoparticles demonstrate impressive initial capacities of 762 and 712 mAh g-1 at 0.1 A g-1, respectively, and deliver specific capacities of 401 and 358 mAh g-1 at 0.3 A g-1 for lithium-ion half-cell batteries. For sodium-ion half-cell batteries, these materials achievesatisfactory initial capacities of 455 and 349 mAh g-1 at 0.1 A g-1, and exhibit exceptional cycling stability with capacities of 223 and 204 mAh g-1 after 1000 cycles at 2 A g-1, respectively.
Benzyl {2-[(2-(1H-Benzo[d][1,2,3]triazol-1-yl)-2-oxoethyl)amino]-2-oxoethyl} carbamate
(Mdpi, 2014) Kucukbay, Hasan; Bugday, Nesrin
N-(Protected alpha-aminoacyl) benzotriazoles are powerful acylating agents, and they are used frequently for preparing peptides and their mimetics and conjugates. The present paper describes the synthesis and characterization of a new benzyl {2-[(2-(1H-benzo[d][1,2,3]triazol-1-yl)-2-oxoethyl)amino]-2-oxoethyl} carbamate.
Boron-doped porous carbon material derived from ZIF-11: Investigation of cotton fabric supercapacitor and Li-ion battery performances
(Wiley, 2022) Bugday, Nesrin; Altin, Serdar; Bulut, Fatih; Altin, Emine; Yasar, Sedat
Nitrogen-doped porous carbon (NPC@ZIF-11) and boron-NPC (BNPC@ZIF-11) materials were synthesized by pyrolysis methods, and structural characterization of the compounds was carried out by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, Brunauer-Elmet-Teller technique, Raman spectroscopy, and inductively coupled plasma-mass spectrometry techniques. The ZIF-11 was converted to the NPC@ZIF11 by pyrolysis. BNPC@ZIF-11 was fabricated from NPC@ZIF-11 by pyrolysis in the presence of phenylboronic acid. The fabric supercapacitor, sandwich-type supercapacitor, and Li-ion battery performances of NPC@ZIF-11 and BNPC@ZIF-11 were investigated. The capacity of the Li-ion cell was found as 720 mAh g(-1) for the first cycle, and it was decreased to 250 mAh g(-1) after 100 cycles. The capacitance values of the cylindrical devices were 92 F g(-1) and 115.6 F g(-1), for C1 and C4000 in KOH electrolytes. The BNPC@ZIF-11 was used as an electrode material on cotton fabric, and the highest obtained capacitance was 72.8 mF for 0.1 mA, which is a promising result for wearable energy storage materials.
Bridged NHC-Pd(II) complexes: Synthesis, DFT calculations, molecular docking, and investigation of catalytic and biological activities
(Elsevier Science Sa, 2024) Firat, Tuba; Bugday, Nesrin; Yasar, Seyma; Boulebd, Houssem; Mansour, Lamjed; Koko, Waleed S.; Hamdi, Naceur
Six palladium(II) ( 3a -f ) complexes of the type [Pd 2 ( mu-Cl) 2 (NHC)] were prepared by transmetallation of the corresponding Ag-NHC and [PdCl 2 (CH 3 CN) 2 ] complexes, and their structures were successfully characterised by 1 H NMR, 13 C NMR, HRMS, FTIR and elemental analysis. Density functional theory (DFT) calculations were also realised for the complexes. The prepared complexes were assessed for their catalytic activity in the C -H arylation of 2-isobuthylthiazole as well as for their biological activities. As results, these complexes were found to be potent catalysts in the creation of C5-arylated 2-isobuthylthiazole derivatives via C -H bond activation reaction. Furthermore, biological activity analysis revealed that complex 3a exhibits high cytotoxicity towards both human colon carcinoma cell lines (HCT-116) and hepatocellular carcinoma cell lines (HepG-2) with IC 50 values of 4.2 and 9.3 mu MmL -1 , respectively. Complex 3b also showed antioxidant activity comparable to that of BHT through DPPH and ABTS assays. Both complexes 3d and 3f also showed significant inhibitory activity towards the AChE enzyme with IC 50 values of 5.06 and 2.52 mu MmL -1 , respectively. Finally, all complexes showed excellent antiparasitic activity, with 3b exhibiting strong antileishmanial activity against both L. major promastigotes and amastigotes. The interaction between the most cytotoxic complexes and DNA, envisaged as a potential mechanism of toxicity, was explored by means of docking studies. In summary, these prepared complexes have the potential to serve as potent catalysts for the synthesis of arylated 2-isobutylthiazole and biologically active agents, paving the way for numerous prospects in the fields of medicinal chemistry and organic synthesis.
C-H Bond activation of 2-isobutylthiazole at C5 position catalysed by Pd-N-heterocyclic carbene complexes
(Elsevier Science Sa, 2021) Bugday, Nesrin; Khan, Siraj; Yasar, Sedat; Ozdemir, Ismail
A highly efficient and effective protocol has been developed for the synthesis of C5-(hetero)arylated 2-isobutylthiazole derivatives. Four different palladium N-heterocyclic carbene (Pd-NHCs) complexes [Pd(mu-Cl)Cl(SIMes)](2) (2), (LCl2 Pd-SIMes) (3: L = PPh3; 4: L = Py; 5: L = 3-CHO-Py) were synthesized and used for the first time as a catalysts in direct C-H arylation reaction of 2-isobutylthiazole at C5 position. Utilizations of these catalytic systems, the arylation of 2-isobutylthiazole with substituted (hetero)aryl bromides efficiently proceeded at low catalyst loading (1 mol%) and without any additives such as PivOH under argon or aerobic conditions at 120 degrees C in a short time. Different substituted (hetero)aryl bromides, even some deactivated or highly sterically hindered (hetero)arylbromides, with a wide range of functional groups were successfully utilized under the optimum reaction conditions. In all cases, the C5 arylated 2-isobutylthiazoles were obtained in moderate to excellent yields. (C) 2021 Elsevier B.V. All rights reserved.
Comparative assessment of ZIF-based electrochemical sensors for Cabotegravir detection in environmental, biological, and pharmaceutical samples
(Elsevier, 2025) Genc, Asena Ayse; Bugday, Nesrin; Bouali, Wiem; Erk, Nevin; Naser, Marwah; Duygulu, Ozgur; Yasar, Sedat
The analysis of biological and environmental samples for drug quantification is a significant task in drug discovery. This study presents a comparative electrochemical evaluation of Zeolitic Imidazolate Frameworks (ZIF11 and ZIF-12) for the sensitive detection of Cabotegravir in environmental, biological, and pharmaceutical samples. Electrochemical sensors were developed using ZIF-11 and ZIF-12-modified glassy carbon electrodes (GCE), demonstrating enhanced electrocatalytic activity toward CAB oxidation. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) confirmed that ZIF-12/GCE exhibited a lower peak separation potential and reduced charge transfer resistance compared to ZIF-11/GCE and bare GCE, attributing the superior electron transfer kinetics to the Co metal center in ZIF-12. Differential pulse voltammetry (DPV) allowed for the quantification of CAB over a wide linear range (0.04 - 10.3 mu M) with a low limit of detection (LOD) of 1.15 nM. The sensors were successfully applied for CAB determination in real samples, including human serum, urine, pharmaceutical formulations, and environmental water (lake and tap water), demonstrating excellent accuracy, repeatability, and selectivity against common interferents. These findings establish ZIF-12/GCE as a promising electrochemical platform for CAB detection across diverse sample matrices, with potential applications in environmental monitoring and pharmaceutical analysis.
Cu@MOF based composite materials: High performance anode electrodes for lithium-ion and sodium-ion batteries
(Elsevier, 2024) Bugday, Nesrin; Deng, Wentao; Zou, Guoqiang; Hou, Hongshuai; Ji, Xiaobo; Yasar, Sedat
In order to satisfy the increasing demand for energy, it is essential to improve the efficiency of lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) batteries. Metal selenides (MSes) have a high theoretical specific capacity, can be designed in a variety of ways, conduct electricity well, can change morphology easily, and have a multi-electron reaction mechanism. These characteristics make them very competitive as anode materials for LIBs and SIBs. Herein, we synthesise Cu@MOF and Cu@NH2-MOF as the precursor to prepare Cu1.95Se embedded into porous carbon matrix (Cu1.95Se@PC) and porous-N-doped carbon matrix (Cu1.95Se@NPC) via pyrolysis process of Cu@MOF and Cu@NH2-MOF, respectively. Cu1.95Se@PC and Cu1.95Se@NPC electrodes for half-cell LIBs and SIBs exhibit a high reversible capacity of 313.1, 480.9 (for LIBs), 216.3 and 303.8 (for SIBs) mAhg(-1) after 1000 cycles at 2 A g(-1), respectively. We assess the electrochemical performance of the Cu1.95Se@PC and Cu1.95Se@NPC anodes by integrating them with commercially available LiFePO4 (LFP) into full-cell LIBs. The LFP//Cu1.95Se@PC and LFP//Cu1.95Se@NPC full-cells have discharge capacities of approximately 330 and 293 mAh g(-1) at 0.3 A g(-1) at the initial cycle. In order to explore the sodium storage mechanism of the Cu1.95Se composites, we conducted an in situ XRD test during the first charge/discharge cycle, considering their favourable cycling and rate performance. Our work provides a promising anode electrode material for both half-cell LIBs and SIBs with high volume utilization and superior electrochemical performances.
Development of a MOF-based electrochemical sensor for trace detection of cannabidiol in biological, environmental, and plant-derived samples
(Pergamon-Elsevier Science Ltd, 2025) Bouali, Mariem; Bugday, Nesrin; Bouali, Wiem; Erk, Nevin; Duygulu, Ozgur; Demirdogen, Ruken Esra; Cengiz, Mehmet Fatih
The accurate determination of cannabidiol (CBD) is of growing importance due to its expanding therapeutic applications, legal regulation requirements, and the need for reliable quality control in biological, environmental, and plant-derived products. In this study, a novel electrochemical sensor based on a MOF-808-modified glassy carbon electrode (MOF-808/GCE) was developed for the sensitive and selective detection of cannabidiol (CBD). The sensor leveraged the high surface area and active sites of MOF-808, which incorporates six monotopic formate ligands, to enhance electrochemical performance. Using differential pulse voltammetry (DPV), the sensor demonstrated a wide linear range (0.02-5.0 mu M), excellent correlation (R2 = 0.997), and a low detection limit of 0.005 mu M. The modified electrode exhibited outstanding repeatability (RSD = 2.0 %) and reproducibility (RSD = 1.4 %). Interference studies confirmed high selectivity against common electroactive species. The sensor was successfully applied to determine CBD in complex real-world matrices, including human plasma, urine, lake and tap water, and Cannabis sativa extracts, with recoveries ranging from 98.38 % to 102.4 %. These results establish the MOF-808/GCE sensor as a robust and efficient tool for trace-level CBD analysis in biological, environmental, and plant-based samples.
Engineering hemp-derived carbon-cobalt chalcogenide hybrids toward durable and high-capacity sodium-ion batteries
(Royal Soc Chemistry, 2026) Bugday, Nesrin; Sahan, Ozgenur Dincer; Duygulu, Ozgur; Karadag, Ahmet; Yasar, Sedat
Biomass carbons (BCs) have emerged as a favored anode material for different types of batteries owing to their cost-effectiveness and environmental sustainability. However, their performance at elevated current densities is suboptimal, necessitating the development of BCs combined with other components that possess high theoretical capacities. Herein, we embedded Co9S8 and CoSe2/Co3Se4 nanoparticles onto porous carbon derived from stem fiber of the hemp (Cannabis sativa L.) plant template using an in situ growth method. This strategy reduces the dissolution of Co9S8 and CoSe2/Co3Se4 in the electrolyte, thereby preventing capacity loss, and heteroatom-containing carbon functionalities enhance interfacial interaction with cobalt chalcogenides and contribute to improved electrochemical stability. The synthesized Co9S8@C-CAN electrode, used as a sodium-ion battery (SIB) anode, demonstrates high reversible capacity and stable cycling behavior. Co9S8@C-CAN retains a capacity of 608 mA h g-1 after 250 cycles, even at a high current density of 2.0 A g-1, with a high cycle stability. This study presents a method for synthesizing hybrid materials by integrating BC with metal sulfides or metal selenides, introducing a novel strategy for the fabrication of SIB anodes.
Evaluation of NMR Results of Newly Synthesized Platinum-Based N- Heterocyclic Carbene Complexes
(Wiley, 2023) Aslan, Sumeyye; Yuce, Hande; Yasar, Sedat; Bugday, Nesrin; Turkmen, Nese Basak; Eke, Benay Can; Unuvar, Songul
[Abstract Not Available]
Fabrication of a Stable and Highly Effective Anode Material for Li-Ion/Na-Ion Batteries Utilizing ZIF-12
(Wiley-V C H Verlag Gmbh, 2024) Bugday, Nesrin; Wang, Haoji; Hong, Ningyun; Zhang, Baichao; Deng, Wentao; Zou, Guoqiang; Hou, Hongshuai
Transition metal selenides (TMSs) are receiving considerable interest as improved anode materials for sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs) due to their considerable theoretical capacity and excellent redox reversibility. Herein, ZIF-12 (zeolitic imidazolate framework) structure is used for the synthesis of Cu2Se/Co3Se4@NPC anode material by pyrolysis of ZIF-12/Se mixture. When Cu2Se/Co3Se4@NPC composite is utilized as an anode electrode material in LIB and SIB half cells, the material demonstrates excellent electrochemical performance and remarkable cycle stability with retaining high capacities. In LIB and SIB half cells, the Cu2Se/Co3Se4@NPC anode material shows the ultralong lifespan at 2000 mAg-1, retaining a capacity of 543 mAhg-1 after 750 cycles, and retaining a capacity of 251 mAhg-1 after 200 cycles at 100 mAg-1, respectively. The porous structure of the Cu2Se/Co3Se4@NPC anode material can not only effectively tolerate the volume expansion of the electrode during discharging and charging, but also facilitate the penetration of electrolyte and efficiently prevents the clustering of active particles. In situ X-ray difraction (XRD) analysis results reveal the high potential of Cu2Se/Co3Se4@NPC composite in building efficient LIBs and SIBs due to reversible conversion reactions of Cu2Se/Co3Se4@NPC for lithium-ion and sodium-ion storage. The Cu2Se/Co3Se4@NPC material, which is synthesized from Cu@ZIF-12, utilizes the advantages of Cu and Co metal complexes to facilitate the storage of lithium and sodium ions. Defect-rich N-doped amorphous carbon (NPC) improves electrical conductivity, and the Cu2Se/Co3Se4@NPC composite material demonstrates remarkable cycle stability while retaining high capacities in LIB and SIB half cells. image
Facile construction of a robust and recyclable laccase/metal-organic framework-808 with boosted stability for biodegradation of Reactive Blue 171 and Reactive Blue 198 from aqueous media
(Elsevier, 2024) Bakar, Busra; Bugday, Nesrin; Birhanli, Emre; Boran, Filiz; Ulu, Ahmet; Yasar, Sedat; Yesilada, Ozfer
Laccase enzyme sees application demand in many industries such as textile, food processing, wood processing, pharmaceutical, and chemical. However, it becomes difficult to maintain the enzymatic activity of laccase under harsh reaction conditions and even after several biocatalytic cycles. Therefore, suitably prescribed supports are crucial to ensure that the catalytic activity and reusability of the immobilized laccase are maintained at high levels. The present study highlights the development and dye decolorization application of an enzyme carrier matrix employing a Zr-based metal-organic framework (MOF), MOF-808, with hierarchical porosity for the immobilization of laccase from Trametes trogii . The immobilization efficiency for Lac/MOF-808 was found to be 70.83 +/- 1.98 %. Lac/MOF-808 exhibited optimal catalytic temperature at 60 degrees C, while the optimal catalytic pH was 4.5. Due to recoverable properties from the carrier matrix the recycle test was satisfactory for the Lac/MOF808, being reused 7 times without losses greater than 50 % of residual activity. Stored at 25 degrees C, Lac/MOF-808 retained 30 % of its activity during 4-weeks period. A kinetic study was carried out for Lac/MOF-808 monitoring the oxidation reaction of ABTS. The K-m value was 0.070 mM and the V-max was 87.7 mu mol min(-1) g(-1). Kinetic investigations, on the other hand, demonstrated a decrease in K m following immobilization, signifying a higher affinity for substrate. The Lac/MOF-808 maintained its decolorization efficiency even after eight reaction cycles, exhibiting a remarkable activity of 56.7 % and 77.2 % against Reactive Blue 171 and Reactive Blue 198, respectively. Hence, the described Lac/MOF-808 might be an ideal candidate for efficient dye decolorization applications.
First electrochemical analysis of acalabrutinib via heterostructure porous carbon matrix contains multimetals
(Pergamon-Elsevier Science Ltd, 2025) Bugday, Nesrin; Genc, Asena Ayse; Bouali, Wiem; Erk, Nevin; Yasar, Sedat
A novel electrochemical sensor based on a NiZn/Co heterostructure embedded in nitrogen-doped porous carbon (NiZn/Co@NPC) was successfully developed for the sensitive determination of Acalabrutinib (ACA). The NiZn/ Co@NPC nanocomposite was synthesized using Ni/Zn@ZIF as a precursor, ensuring the uniform dispersion of nanoparticles within the porous carbon matrix, as confirmed by XRD, SEM, and TEM analyses. The incorporation of multi-metallic active sites and the high surface area of the porous carbon significantly enhanced electron transfer, minimized nanoparticle aggregation, and improved electrochemical performance. The NiZn/Co@NPCmodified glassy carbon electrode (NiZn/Co@NPC/GCE) exhibited superior sensitivity compared to the bare electrode, with a wide linear detection range (0.5-5.0 mu M), a low detection limit (0.03 mu M), and excellent repeatability (RSD = 1.4 %) and reproducibility (RSD = 2.0 %). The sensor demonstrated high selectivity against potential interferents, confirming its robustness for real-world applications. Analytical validation in pharmaceutical capsules, spiked urine, and plasma samples using the standard addition method yielded recoveries ranging from 99.4 % to 101.9 %, confirming the accuracy and reliability of the electrochemical method. The incorporation of multi-metallic active sites and creation of more electroactive surface area in the porous carbon by doping different redox active metals leads to significantly enhanced charge transfer, minimized nanoparticle aggregation, and improved electrochemical performance.
Hard carbon-encapsulated cobalt chalcogenides derived from waste apricot seed testa biomass: High performance anode electrode materials for Na-ion storage
(Elsevier, 2025) Bugday, Nesrin; Onal, Yunus; Duygulu, Ozgur; Deng, Wentao; Ji, Xiaobo; Yasar, Sedat
Anode materials are crucial in sodium-ion batteries (SIBs), and the advancement of low-cost, high-capacity, and cycle-stable anode materials is a primary objective in the progression of sodium-ion batteries. Carbon, derived from biomass has emerged as a prominent anode material for energy storage devices, attributed to its costeffectiveness and environmental sustainability. Given their limited capacities at elevated current densities, it is essential to create biomass-derived composites incorporating other components with high theoretical capacities. This study successfully embeds Co3O4, Co9S8, and Co3Se4 cobalt chalcogenide nanoparticles onto hard carbon derived from the biomass of waste apricot seed testa (WAST). Hard carbon coating reduces or inhibits the dissolution of Co3O4, Co9S8, and Co3Se4 cobalt chalcogenides in the electrolyte, thereby preventing capacity loss. The synthesized Co3O4@HC-WAST, Co9S8@HC-WAST, and Co3Se4@HC-WAST electrodes demonstrate excellent cycling stability and rate performance when test as sodium-ion battery anodes. The capacity of the best anode material, Co3Se4@HC-WAST, is maintained at 307.8 mAh g- 1 (5 A g- 1) after 750 cycles with 99 % Coulombic efficiency. This study outlines a method for the preparation and comparison of the electrochemical performance of composite hybrid materials comprising hard carbon and cobalt chalcogenides.
High-performance electrodes for Li-ion cell: Heteroatom-doped porous carbon/CoS structure and investigation of their structural and electrochemical properties
(Wiley, 2022) Bugday, Nesrin; Altin, Emine; Altin, Serdar; Yasar, Sedat
As an essential class of anode materials, the synthesis and characterization of CoS@ZIF-12-C composite anode materials are reported. The two-step synthesis of CoS nanoparticles embedded in N-doped porous carbon by using a metal-organic framework (MOF) as the template. After structural characterization of CoS@ZIF-12-C composite materials, the main phase was found as CoS with symmetry of P63mmc. Benefiting from the CoS embedded in porous carbon structure, the half Li-ion battery cell tests of CoS@ZIF-12-C composite materials were performed by a 2-electrode method using CR2032 cells, and the capacities of the cells were measured for 200 cycles using 300 mAg(-1) and 500 cycles using 1000 mAg(-1). The first discharge capacities of the cells for 1000 mAg(-1) were found as 458, 1178, and 815 mAhg(-1) for CoS@ZIF-12-C-T, T = 700, 800, and 900 degrees C, respectively. An unexpected capacity increase was observed for the CoS@ZIF-12-C-700 and CoS@ZIF-12-C-900 half cells during the cycling. Ex-situ x-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and cyclic voltammetry (CV) analysis were performed after cycling of the cells for explanations of the capacity increase. Ex-situ XRD analysis of these cells showed phase transitions from crystalline to amorphous type structure, and ex-situ FTIR proves the preservation of the CoS phase during the cycling. A redox reaction mechanism was suggested to explain the cells' battery performance by ex-situ XRD analysis.
Highly Active Fe3O4@SBA-15@NHC-Pd Catalyst for Suzuki-Miyaura Cross-Coupling Reaction
(Springer, 2022) Akkoc, Mitat; Bugday, Nesrin; Altin, Serdar; ozdemir, Ismail; Yasar, Sedat
A novel Pd-NHC functionalized magnetic Fe3O4@SBA-15@NHC-Pd was synthesized and used as an efficient heterogeneous catalyst in the Suzuki-Miyaura C-C bond formation reactions. The Fe3O4@SBA-15@NHC-Pd characterized by X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray analysis (EDX), Thermogravimetric Analysis (TGA), Differential Thermal Analysis (DTA). The Inductively Coupled Plasma-Optical emission spectroscopy (ICP-OES) analysis was used to determine the exact amount of Pd (0.33 wt%) in Fe3O4@SBA-15@NHC-Pd. The TEM images of the catalyst showed the existence of palladium nanoparticles immobilized in the catalyst's structure, while no reducing agent was used. The NHC moieties in the catalyst structure could be stabilize Pd(0) nanoparticles prevents agglomeration. The magnetic catalyst was effectively used in the Suzuki-Miyaura cross-coupling reaction of substituted phenylboronic acid derivatives with (hetero)aryl bromides in the presence of a K2CO3 at room temperature in aqueous media and magnetic catalyst could be simply extracted from the reaction mixture by an external magnet. Different aryl bromides were converted to coupled-products in excellent yields with spectacular TOFs values (up to 1,960,339 h(-1)); in the presence of 1 mg of Fe3O4@SBA-15@NHC-Pd catalyst (contains 3.1 x 10(-6) mol% Pd) at room temperature in aqueous media. After reusability experiments, it is found that this catalyst was effectively used up to ten times in the reaction with almost consistent catalytic efficiency. A decrease in the activity of the 10th reused catalyst was found as 9%. Graphic Abstract
Magnetic Cu/Co nanoparticles supported on nitrogen-doped porous carbon derived from Cu/Co@aZIF: Investigation of catalytic activity and structural properties
(Wiley, 2023) Bugday, Nesrin; Yasar, Sedat; Altin, Serdar; Duygulu, Ozgur; Onal, Yunus
By calcining copper-doped amorphous zeolitic imidazolate framework (Cu/Co@aZIF), a novel magnetic nanoporous carbon composite (Cu/Co@NPC) material was produced, characterized by different spectroscopic techniques, and used for the first time as an efficient catalyst for the azide-alkyne cycloaddition (AAC) reaction and the reduction reaction of nitrophenol (RRN) under air in water. With this catalyst, the AAC and RRN reactions were conducted in aqueous solutions, and good to excellent yields of related products were synthesized in a short reaction time. The potential of the magnetic Cu/Co@NPC nanocatalyst for targeting RRN and AAC reactions was uncovered by studying specific substrates for RRN and AAC reactions. The Cu/Co@NPC magnetic nanocatalyst is recyclable at least five times, with just a drop of 6% and 22% in catalytic efficiency in RRN and AAC, respectively.
Magnetite@MCM-41 nanoparticles as support material for Pd-N-heterocyclic carbene complex: A magnetically separable catalyst for Suzuki-Miyaura reaction
(Wiley, 2021) Akkoc, Mitat; Bugday, Nesrin; Altin, Serdar; Yasar, Sedat
The Magnetite@MCM-41@NHC@Pd catalyst was obtained with Pd metal bound to the NHC ligand anchored to the surface of Fe3O4@MCM-41. It was characterized by Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy disperse X-ray analysis (EDX), thermogravimetric analysis (TGA), differential thermal analysis (DTA), and scanning electron microscopy (SEM). The amount of Pd in the Magnetite@MCM-41@NHC@Pd was measure by inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis. The catalytic activity of Magnetite@MCM-41@NHC@Pd heterogeneous catalyst done on Suzuki-Miyaura reactions of aryl halides with different substituted arylboronic acid derivatives. All coupling reactions afforded excellent yields and up to 408404 Turnover Frequency (TOF) h(-1) in the presence of 2 mg of Magnetite@MCM-41@NHC@Pd catalyst (0.0564 mmol g(-1), 0.01127 mmol% Pd) at room temperature in 2-propanol/H2O (1:2). Moreover, Magnetite@MCM-41@NHC@Pd catalyst was recover by applying the magnet and reused for another reaction. The catalyst showed excellent structural and chemical stability and reused ten times without a substantial loss in its catalytic performance.
MOF-derived SnSe/carbon composite anode materials for Li-ion and Na-ion batteries
(Nonferrous Metals Soc China, 2025) Bugday, Nesrin; Deng, Wentao; Duygulu, Ozgur; Zou, Guoqiang; Hou, Hongshuai; Ji, Xiaobo; Yasar, Sedat
Metal selenides (MSs) are attracted considerable interest as potential anode electrode materials for Li-ion/Na-ion batteries (LIBs/SIBs) owing to their elevated theoretical capacity and superior conductivity. Nevertheless, their potential is constrained by inadequate capacity retention and inferior longevity, principally due to volumetric expansion and undesirable structural failure caused by the insertion and extraction of comparatively large Li+/Na+ ions during charging and discharging. Therefore, three different composites containing SnSe and one more metal selenide are synthesized using metal-organic framework (MOF) to enhance the accommodation of Li/Na ions and provide adequate ion routes. The Co3Se4/SnSe@NPC material demonstrates exceptional cyclic stability and rate capability as anode material for LIBs and SIBs (603 mAh g-1 after 1000 cycles at 2 A g-1 (for LIBs) and 296 mAh g-1 after 1000 cycles at 2 A g-1 (for SIBs)). This electrochemical performance enhancement may be attributed to the improved conductivity of the composite structure and introduction of SnSe, which facilitates the transfer of electrons within the structure. In addition, selenium- and nitrogen-doped mesoporous carbon architectures facilitate electrolyte penetration in active materials, enhance contact area, promote effective diffusion of Li+ or Na+ within the composite, and mitigate volume expansion during the charge-discharge cycle. Consequently, the Co3Se4/SnSe@NPC composite offers a novel perspective on the advancement of anode materials for LIBs and SIBs. (sic)(sic)(sic)(sic)(sic) (MSs)(sic)(sic)(sic)(sic)(sic)/(sic)(sic)(sic)(sic)(sic) (LIBs/SIBs)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)Li+/Na+(sic)(sic) (sic)(sic)/(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)-(sic)(sic)(sic)(sic) (MOF)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SnSe (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)Li/Na (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), Co3Se4/SnSe@NPC (sic)(sic)(sic)(sic)(sic)LIBs (sic)SIBs (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)((sic)2 A g-1 (sic)(sic)(sic)(sic)(sic)(sic),LIBs (sic)(sic)1000 (sic)(sic)(sic)(sic)(sic)(sic)(sic)603 mAh g-1;SIBs (sic)(sic)1000 (sic)(sic)(sic)(sic)(sic)(sic)(sic)296 mAh g-1).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SnSe (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic),(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic) Li+/Na+(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), Co3Se4/SnSe@NPC (sic)(sic)(sic)(sic)(sic)LIBs (sic)SIBs (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).
N-heterocyclic carbene Pd(II) complex supported on Fe3O4@SiO2: Highly active, reusable and magnetically separable catalyst for Suzuki-Miyaura cross-coupling reactions in aqueous media
(Elsevier Science Sa, 2021) Akkoc, Mitat; Bugday, Nesrin; Altin, Serdar; Kiraz, Nadir; Yasar, Sedat; Ozdemir, Ismail
A new type magnetic nano Fe3O4@SiO2@NHC@Pd-MNPs heterogeneous catalyst was fabricated and characterized by Fourier Transform Infrared (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Energy Disperse X-ray analysis (EDX), Thermogravimetric Analysis (TGA), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy (SEM). The loading amount of Palladium (Pd) to magnetic nano Fe3O4@SiO2@NHC@Pd-MNPs was measured by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) analysis. The catalytic activity of magnetic nano Fe3O4@SiO2@NHC@Pd-MNPs heterogeneous catalyst was examined on Suzuki-Miyaura cross-coupling reactions of aryl halides with different substituted arylboronic acid derivatives. All coupling reactions yielded excellent results and high TOF (up to 76528 h(-1)) in the presence of 2 mg of Fe3O4@SiO2@NHC@Pd-MNPs catalyst (0.0197 mmolg(-1), 0.00394 mmol%Pd) at 80 degrees C in 2-propanol/H2O (1:2). In addition, the magnetic nano Fe3O4@SiO2@NHC@Pd-MNPs catalyst was easily recovered by using an external Nd-magnet and reused for the Suzuki cross-coupling reactions. The catalyst showed strong structural and chemical stability and was reused six times without losing its catalytic activity substantially. (C) 2021 Elsevier B.V. All rights reserved.

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