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SARIOĞLU, CEVAT

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    Synthesis of SnS2 photocatalyst for photocatalytic hydrogen production
    (2022-06-30) OK, ALAADDİN CEM; SARIOĞLU, CEVAT; Ok A. C., Sarıoğlu C.
    Hydrogen could be generated from both renewable and non-renewable sources of energy. Usingnonrenewable energy sources to produce hydrogen will result in greenhouse CO2 gas emissions andcause global warming. Photocatalytic systems for generating hydrogen from solar energy have a greatdeal of potential to solve the global warming problem because of the totally renewable green source ofsun and water. Because of its superior properties, such as a proper and narrow bandgap, betterchemical stability, non-toxic, photo-corrosion resistance, and suitable optimum conduction and valanceband potentials, the tin disulfide (SnS2) photocatalyst has great potential to be used for producing H2from the splitting of water via solar energy. In this study, SnO2 powders were successfully thermallysulfurized to SnS2 powders at 500°C for 24 hours under an Argon (Ar) atmosphere. The XRD analysisverified the hexagonal SnS2 crystals. UV-vis spectroscopy was used to determine the band gap valueof the generated powder, which is 2.24 eV.
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    Photoelectrochemical performance of thermally sulfurized CdxZn1-xS photoanode: Enhancement with reduced graphene oxide support
    (PERGAMON-ELSEVIER SCIENCE LTD, 2020) ÖZKAYA, ALİ RIZA; Ayaz, RanaMuhammad Zunain; Akyuz, Duygu; Uguz, Ozlem; Tansik, Irem; Sarioglu, Cevat; Karaca, Fatma; Ozkaya, Ali Riza; Koca, Atif
    In this study, photoelectrochemical performance of reduced graphene oxide (RGO)-CdxZn1-xS compos-ites, which were synthesized through a novel two-steps thermal sulfurization process by using elemental sulfur, was reported. This is the first time that the two-step thermal sulfurization process with elemental sulfur for the preparation of photoanode based on RGO-CdxZn1-xS. The electrodes exhibited high photostability and photocurrent response in the presence of visible light. The presence of RGO in CdxZn1-xS as electron collector and transporter increased the photocurrents approximately 40%. Among the RGOCdxZn1-xS composites, RGO-CdS photoanode yielded an extremely high photocurrent density of 6.5 mAcm(-2) with the rate of hydrogen production rate of 551.1mmolh(-1)cm(-2). This value of photocurrent density is almost 89% of its theoretical value. This is the maximum attained photocurrent density with superior stability in comparison with related literature. (c) 2020 Elsevier Ltd. All rights reserved.
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    Fabrication and characterization of anodic films on 304 stainless steel
    (2022-11-19) SARIOĞLU, CEVAT; YUMUŞAK, GÖRKEM; Ağırlar N., Bağcı N. C., Arkalı E., SARIOĞLU C., YUMUŞAK G.
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    Solar-hydrogen production with reduced graphene oxide supported CdxZn1-xS photocatalysts
    (PERGAMON-ELSEVIER SCIENCE LTD, 2020) ÖZKAYA, ALİ RIZA; Tanisik, Irem; Uguz, Ozlem; Akyuz, Duygu; Ayaz, Rana Muhammad Zunain; Sarioglu, Cevat; Karaca, Fatma; Ozkaya, Ali Riza; Koca, Atif
    Reduced graphene oxide (RGO)/CdxZn(1-x)S composites were firstly synthesized by thermal sulfurization method in one pot with elemental sulfur as sulfur source. By using one pot synthesis, CdxZn(1-x)S particles were decorated on the RGO sheets during sulfurization of Cd2+ and Zn2+ precursors. This synthesis method eased the control of the particle sizes of CdxZn(1-x)S by providing homogenous decoration of RGO with CdxZn(1-x)S particles and increased the strength between RGO sheet and CdxZn(1-x)S particles, which enhanced charge carrier mobility rate. Here, RGO in the composite structure supplied high electron conductivity, high adsorption capacity and extended light absorption ability. Thus, prepared RGO/CdxZn(1-x)S composites enhanced the photocatalytic activity. The crystal systems, lattice parameters, band gaps and surface morphologies of all photocatalysts are characterized to determine the factors that affected the photocatalytic activities of the composites. After that, the photocatalytic activities of prepared photocatalysts were tested by measuring H-2 evolution rates. Among the composites, RGO/Cd0.7Zn0.3S structure possessed the highest H-2 production rate (141.6 mu molh(-1)) and apparent quantum efficiency (19.4%). (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.