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    Optimization of Electrochemical Presodiation Parameters of Na-Ion Full Cells for Stable Solid-Electrolyte Interface Formation: Hard Carbon Rods from Waste Firefighter Suits
    (Wiley-V C H Verlag Gmbh, 2023) Yalman, Emine; Altundag, Sebahat; Aydin, Mustafa Goktan; Onal, Yunus; Depci, Tolga; Tekbas, Hasan; Bulut, Fatih
    Utilizing the synthetic waste of firefighter costumes, rod-shaped hard carbon materials are effectively produced for the first time with over 99% purity, and their structural properties are evaluated using the appropriate spectroscopic techniques. The galvanostatic cycling tests are performed at different temperatures and the result shows that the capacity and capacity fade values are directly affected by the temperature. The high-rate consumption of sodium ions during the evolution of the solid-electrolyte interface in the first cycle of the cells is observed and the highest capacity of the half cells is obtained as 410 and 233 mAh g(-1) for the first and second cycles, respectively. To compensate for the sodium-ion loss, an electrochemical treatment presodiation technique is implemented, which is an effective means of compensating for the initial inefficiency. The optimum presodiation condition of electrochemical treatment of anode electrode for the production of Na0.67Mn0.5Fe0.45Ti0.07O2/presodiated hard carbon full cells is investigated. The highest capacity values for C/10 are obtained at 114.9 mAh g(-1) for the full cells using the voltage window of 2-4 V. The cost analysis of the battery pack for 90 kW electric-powered cars is calculated by the BatPaC software and the results are evaluated for possible commercialization.
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    Synthesis and characterization of whitlockite from sea urchin skeleton and investigation of antibacterial activity
    (Elsevier Sci Ltd, 2021) Yucel, Aysegul; Sezer, Selda; Birhanli, Emre; Ekinci, Tuba; Yalman, Emine; Depci, Tolga
    In the present study, undoped whitlockite and ZnO doped-Whitlockite, which is the second most abundant inorganic material in bone structure, were synthesized from sea urchin skeleton. The obtained bioceramic ma-terials were characterized by XRD, FT-IR, and SEM and their antibacterial activities were determined using the inhibition zone diameters of Escherichia coli and Pseudomonas aeruginosa as gram negative bacteria and Staphylococcus aureus as gram positive bacterium after 24 h incubation. The characterization studies showed that nano size homogenous biocereamic whitlockite (Ca2.86Mg0.14(PO4)(2)) was synthesized from the sea urchin skeleton. After dopping process, the main structure of the whitlockite keeps stable, showing a dopping concentration-independent character. On the other hand, the peaks belonging to ZnO were started to seen in the XRD pattern with increasing the level of ZnO-concentration (after 7 %). All experimental results point out that the obtained whitlockites are viable nominate candidates for bioceramic materials and the results of antibacterial sensitivity prove the inhibitory effect towards Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus for ZnO-doped-whitlockite.