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    Facile fabrication of Sn/SnOx electrode as an efficient electrocatalyst for CO2 reduction to formate
    (Elsevier Ltd, 2023) Rende, Kumru; Balun Kayan, Didem; Çolakerol Arslan, Leyla; Ergenekon, Pınar
    Producing valuable hydrocarbons via electrochemical reduction of CO2 has been a promising active research area. In this study, it was aimed to develop a low-cost and efficient Sn-based electrode reducing CO2 to formate with high selectivity. SnOx thin-film electrode was prepared via potentiostatic electrodeposition at the potentials of ?0.5 V, ?0.6 V, ?0.7 V, and ?0.8 V vs. Ag/AgCl on a pure Sn plate for 300 s in an acidic media. The Sn/SnOx electrode which was prepared at ?0.6 V was found to have the highest Faradaic efficiency. Electrochemical reduction of CO2 was carried out on this Sn/SnOx electrode in aqueous CO2-saturated 0.1 M KHCO3 solution. The optimum values for the parameters which have significant impacts on Faradaic efficiency for producing formate namely, electrolysis potential and electrolysis time were determined. The maximum Faradaic efficiency of formate on the Sn/SnOx electrode was obtained as 74.7 % at the applied potential of ?1.8 V in an H-type cell. The maximum Faradaic efficiency of formate obtained on the Sn/SnOx electrode reached about twice the value obtained on the Sn plate (39.7 %). The results also indicated that the Sn/SnOx electrode has higher catalytic stability and electrochemically active surface area (2.08 cm2) than the bare Sn plate (0.82 cm2). This study showed that an efficient Sn/SnOx electrode can be developed with a simple method that involves only a SnSO4/H2SO4 solution and as short as 300 s plating duration via electrodeposition at a lower overpotential of ?0.6 V. The novelty of this study can be attributed to the combination of simple and unique electrocatalyst preparation procedure with less energy consumption and chemical/additive use, short deposition time, and relatively low overpotential for developing an efficient Sn/SnOx electrocatalyst ensuring a high Faradaic efficiency for formate production. Thus, producing formate from the conversion of CO2 which is a waste carbon source, was achieved by a quite simple and economic method.
  • Küçük Resim
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    Sn-based chi-rGO/SnO2 Nanocomposite as an Efficient Electrocatalyst for CO2 Reduction to Formate
    (John Wiley and Sons Inc, 2024) Rende, Kumru; Kayan, Didem Balun; Çolakerol Arslan, Leyla; Ergenekon, Pınar
    Designing efficient and cost-effective electrocatalysts in simple ways is very important for energy efficiency. In this sense, nano-sized materials have been extensively utilized for the development of efficient electrodes for electrochemical CO2 reduction. In the present study, we have developed a Sn/chitosan-reduced graphene oxide (chi-rGO)/SnO2 composite electrode via only electrochemical techniques and tested it for electrochemical reduction of CO2 to formate. A bare Sn plate was modified with a reduced graphene oxide layer in the presence of chitosan to get a stable Sn/chi-rGO composite structure and to get more active sites, thus an efficient reduction process was performed. The surface of the Sn/chi-rGO composite was further modified by SnO2 nanoparticles via the potentiostatic electrodeposition method at a fixed applied potential of ?0.6 V for varying periods. The calculated double-layer capacitance (Cdl) of the Sn/chi-rGO/SnO2 electrode was about 80 times larger than the bare Sn plate implying that the coexistence of SnO2 nanoparticles on the (chi-rGO) structure enhanced the electrochemically active sites. The maximum Faradaic efficiency was recorded as 88 % towards the production of formate at an average current density of ?7.36 mAcm?2 at ?1.8 V. Electrochemical measurements and the stability test revealed that the resultant Sn/chi-rGO/SnO2 composite structure behaves as a potential electrode material for efficient CO2 conversion to formate.The study presents a simple and low-cost electrode preparation procedure including only electrochemical techniques which can be conducted within a very short time and without using extra energy and chemicals/additives.