Yazar "Deng, Wentao" seçeneğine göre listele

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  • Küçük Resim Yok
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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.
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    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.
  • Küçük Resim Yok
    Öğe
    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
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    Öğe
    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.
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    Metal-Organic Framework Materials for Electrochemical Supercapacitors
    (Shanghai Jiao Tong Univ Press, 2022) Cao, Ziwei; Momen, Roya; Tao, Shusheng; Xiong, Dengyi; Song, Zirui; Xiao, Xuhuan; Deng, Wentao
    Exploring new materials with high stability and capacity is full of challenges in sustainable energy conversion and storage systems. Metal-organic frameworks (MOFs), as a new type of porous material, show the advantages of large specific surface area, high porosity, low density, and adjustable pore size, exhibiting a broad application prospect in the field of electrocatalytic reactions, batteries, particularly in the field of supercapacitors. This comprehensive review outlines the recent progress in synthetic methods and electrochemical performances of MOF materials, as well as their applications in supercapacitors. Additionally, the superiorities of MOFs-related materials are highlighted, while major challenges or opportunities for future research on them for electrochemical supercapacitors have been discussed and displayed, along with extensive experimental experiences.
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    Öğe
    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).
  • Küçük Resim Yok
    Öğe
    Outstanding electrochemical and long cycle performance of the transition metal selenides embedded in porous carbon
    (Elsevier Science Sa, 2025) Bugday, Nesrin; Deng, Wentao; Duygulu, Ozgur; Ji, Xiaobo; Yasar, Sedat
    Transition-metal selenides are drawn significant attention owing to their high energy density and theoretical capacity. Nonetheless, their inadequate conductivity, poor cycling stability, subpar rate performance, and volume expansion impede their practical application in battery systems. We effectively synthesize core-shell Cu2Se/ZnSe@NPC, Cu2Se@NPC, and Cu2Se/Co3Se4@NPC composite heterostructures utilizing ZIF-8 and ZIF-67 as precursors. The Cu2Se, ZnSe, and Co3Se4 nanoparticles added to the N-doped porous carbon (NPC) structure provide enormous active sites for the electrodes in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). We belive that, the N-doped porous carbon (NPC) reduces the volume change impact created during the cycle process while simultaneously improving the conductivity. The Cu2Se/Co3Se4@NPC composite shows better performance and stability for SIBs, while the Cu2Se/ZnSe@NPC is outstanding for LIBs. Cu2Se/Co3Se4@NPC, Cu2Se/ZnSe@NPC, and Cu2Se@NPC electrodes exhibit a high initial capacity of 1507, 798, and 1023 mAh g-1 for LIBs, respectively. For SIBs after 1000 cycles, the capacities of the materials maintain at 310, 237, and 181 mAh g-1, respectively. Furthermore, the Cu2Se/ZnSe@NPC, Cu2Se@NPC, and Cu2Se/Co3Se4@NPC composites demonstrate exceptional rate performance for SIBs and LIBs. The reaction kinetics of Li/Na ions in the Cu2Se/ ZnSe@NPC, Cu2Se@NPC, and Cu2Se/Co3Se4@NPC composites are examined to elucidate their exceptional electrochemical performance. The results show the great potential of these composites and help us understand how different metal selenides, both alone and in different combinations, affect the creation of effective LIBs and SIBs.
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    Sustainable chickpea stem-inspired cobalt chalcogenide-carbon composites as ultra-stable anodes for sodium-ion batteries and hybrid capacitors
    (Elsevier, 2026) Bugday, Nesrin; Onal, Yunus; Duygulu, Ozgur; Deng, Wentao; Ji, Xiaobo; Yasar, Sedat
    The improvement of sustainable and high-performance anodes is essential for the future of sodium-ion energy storage systems (SIESS). Transition metal chalcogenides (TMCs) as anode have become a focal point of research because to their substantial capability facilitated by conversion or alloying reactions. Herein, metallic cobalt nanoparticles supported on the chickpea stem derived carbon (Co@CSC) underwent controlled oxidation, sulfurization, and selenization to form cobalt chalcogenides/carbon (Co3O4@CSC, Co9S8@CSC, and Co3Se4@CSC) composites. Electrochemical evaluation of these composites for sodium-ion batteries (SIBs) reveals reversible capacity of 586 mAh g(-1) at a current density of 0.1 A g(-1), along with remarkable rate performance of 370 mAh g(-1) at 2.0 A g(-1) and long-term stability after 1000 cycles for Co9S8@CSC. In contrast, the Co3Se4@CSC shows dominant pseudocapacitive contributions, enhancing both reversibility and long-term stability. Practical applicability is confirmed in full cells employing Na3V2(PO4)(3) cathodes: the Co3Se4@CSC//Na3V2(PO4)(3) configuration delivered capacity of 146 mAh g(-1) at a current density of 0.1 A g(-1). According to hybrid capacitor tests, Co3Se4@CSC surpass Co9S8@CSC by providing greater reversible capacity (similar to 85 mAh g(-1)) and steadier voltage profiles. Robust coupling between the cobalt chalcogenides and the conductive porous carbon promote efficient charge transport, preserved structural integrity during cycling, and enhanced redox kinetics.
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    ZIF-12-derived N-doped Fe/Co/S/@C nanoparticles as high-performance composite anode electrode materials for lithium-ion batteries
    (Elsevier Science Sa, 2022) Bugday, Nesrin; Ates, Mehmet Nurullah; Duygulu, Ozgur; Deng, Wentao; Ji, Xiaobo; Altin, Serdar; Yasar, Sedat
    Different sulfide species of both iron and cobalt metals (FeS2, FeS, CoS, and FeCoS2) are composed together in N-doped porous carbon (NPC) for the synthesis of composite anode materials (labeled as Fe/Co/S@NPC-T hereafter, T = 700, 800, 900) by sulfurization and pyrolysis of Fe/Co-based zeolitic imidazolate framework (ZIF-12). Their structural properties are investigated by XRD, FTIR, SEM, TEM, BET and XPS analysis, and Fe/ Co/S@NPC-T composite materials, heat treated at different temperatures, are used as anode materials in rechargeable lithium-ion batteries. According to XRD results, the heat treatment of the Fe/Co@ZIF-12/S heat treated at 900 ? leads to the formation of the FeCoS2 phase (66 %) along with CoS (33 %) phase impurity. The heat treatment of the Fe/Co@ZIF-12/S heat treated at 800 ? causes the formation of the main phase of FeCoS2 with minor impurity phases of CoS and FeS2. However, pyrolysis of the Fe/Co@ZIF-12/S heat treated at 700 & DEG;C leads to the formation of the FeCoS2, CoS, FeS, and FeS2 phases. Among the samples, the highest BET surface area is 53.4 m2/g for the Fe/Co/S@NPC-90 0 sample. The CV analysis of the battery cell shows anodic and cathodic redox peaks, which belong to the redox reaction of CoS, FeS2, and FeS. The first dis-charge capacities of the cells for Fe/Co/S@NPC-70 0, Fe/Co/S@NPC-80 0 and Fe/Co/S@NPC-90 0 are 395, 963, 574 mA h/g at 300 mA/g, and 229, 835 and 1024 mA h/g at 1000 mA/g, respectively. (c) 2022 Elsevier B.V. All rights reserved.