Proceedings of Catalyst Design Strategies for Photo- and Electrochemical Fuel Synthesis (ECAT25)
Publication date: 19th December 2024
Photo electro-catalytic reduction (PECR) of CO2 to value-added chemicals and fuels will reduce the dependency on fossil fuels and at the same time, it will solve environmental issues such as unevenness in the temperature, rains, and rise in sea levels. To reduce the highly stable linear molecule of CO2, a Z-schematic heterojunction thin film of TiO2-Pt-Cu2O was synthesized by anodization, sputtering, and electrodeposition methods respectively. The successfully synthesized electrodes are characterized by XRD to conform to the crystalline phase formation, the optical behaviour of the electrodes is characterized by DRS UV-visible analysis, which conforms enhanced light absorption towards the visible region as compared to pristine electrodes. Further, morphological and EDAX analysis conforms to the shapes and elements present in the samples. Linear sweep voltammetry (LSV) analysis was performed on the synthesized electrodes in the presence and absence of the dissolved CO2 in light irradiation and absence of light, which conforms increase in current density to 10.2 mA/cm2 (TiO2-Pt-Cu2O) as compared to 1.2 mA/cm2 for TiO2. Further, Electrochemical impedance spectroscopy was performed for the charge transfer behaviour of the electrodes. Chronoamperometry (CA) analysis was carried out at various applied potentials ranging from 0 to -1.2V vs. Ag/AgCl for dissolved CO2 reduction, the product obtained during the reactions was analysed by gas chromatography and it was confirmed that various products of H2, and CO, CH4, CH3OH and C2H5OH were observed with enhancement in the formation of the products is observed for Z-schematic heterojunction.
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