Fabrication and optimization of perovskite-based photoanodes for solar-driven CO2 photoelectroreduction to formate

作者：José Antonio Abarca, Ivan Merino‐Garcia, Guillermo Díaz‐Sainz, Maite Perfecto-Irigaray, Garikoitz Beobide, Ángel Irabien, Jonathan Albo · 发表于：Catalysis Today · 年份：2024 · DOI：10.1016/j.cattod.2023.114505 · 被引用次数：35 · 研究领域：Advanced Photocatalysis Techniques、CO2 Reduction Techniques and Catalysts、Perovskite Materials and Applications

The photoelectrochemical reduction of CO 2 to value-added products represents a promising strategy for mitigating CO 2 emissions.However, further research efforts need to be undertaken to enable the technology for scaleup, including the design and fabrication of efficient photoelectrodes capable of yielding substantial photogenerated current densities.In this work, a photoanode combining a commercial calcium titanate perovskite (CaTiO 3 ) and BiVO 4 layers coated onto a transparent FTO substrate by automated spray pyrolysis is proposed.Different photoanode configurations are tested, with the most favourable results achieved when BiVO 4 is positioned as the top layer with back illumination.The optimization of the catalytic loading is also assessed, finding an optimal at 1 mg cm -2 of CaTiO 3 and 3 mg cm -2 of BiVO 4 , resulting in an impressive current density of -71 mA cm -2 at -1.8 V vs. Ag/AgCl.This optimal photoanode is then integrated into an electrolyzer for continuous visible light-driven CO 2 reduction in the gas phase to formate, obtaining a concentration of 63.8 g L -1 , with a Faradaic Efficiency of 79.1 %, and solar-to-fuel conversion efficiency of 7.6 %.These results represent a significant advancement in the development of photoanodes, offering promise for the future scalability of photoelectrochemical CO 2 reduction processes.