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Boosting Visible-Light-Driven CO2 Reduction to CH4 for In Situ Resource Utilization Application with BiVO4/WO3 Heterojunction Photoanodes Developed by Magnetron Sputtering
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DOI：10.1002/adsu.70617.png)
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Abstract
En 中文
Photoelectrochemical reduction of CO2 into energy-dense hydrocarbons represents a promising strategy for sustainable fuel production and in situ resource utilization. This is particularly attractive in extraterrestrial environments where CO2-rich atmospheres and solar energy are readily available, enabling the conversion of locally available resources into fuels and chemical feedstocks while reducing reliance on Earth-supplied materials. In this work, BiVO4 and BiVO4/WO3 photoanodes are fabricated by magnetron sputtering and integrated into a photoelectrochemical system with a Cu-based gas diffusion cathode for selective CO2 reduction to CH4 using greywater as electrolyte. The BiVO4/WO3 heterojunction enhances charge separation and electron transport, achieving optimal performance with thicknesses of 100 nm (BiVO4) and 130 nm (WO3), with a CH4 faradaic efficiency of 47.9%, an energy-to-fuel conversion efficiency of 2.7%, and a production rate of 36.7 µmol m−2 s−1 under gas-phase operation. These results highlight the potential of heterojunction engineering and scalable sputtering deposition for high-performance photoelectrochemical CO2 conversion toward solar-driven CH4 production.
Keywords:
BiVO4/WO3 heterojunction
CO2 reduction
magnetron sputtering
methane
phoelectrochemistry
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