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Nanostructured Au Electrode with 100 h Stability for Solar-Driven Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide.

ABSTRACT: Solar-to-chemical energy conversion is a potential alternative to fossil fuels. A promising approach is the electrochemical (EC) reduction of CO2 to value-added chemicals, particularly hydrocarbons. Here, we report on the selective EC reduction of CO2 to CO on a porous Au nanostructure (pAu) cathode in 0.1 M KHCO3. The pAu cathode anodized at 2.6 V exhibited maximum Faradaic efficiency (FE) for conversion of CO2 to CO (up to 100% at -0.75 V vs reversible hydrogen electrode (RHE)). Furthermore, commercial Si photovoltaic cells were combined with EC systems (PV-EC) consisting of pAu cathodes and IrO2 anodes. The triple-junction cell and EC system resulted in a solar-to-CO conversion efficiency (SCE) of 5.3% under 1 sun illumination and was operated for 100 h. This study provides a PV-EC CO2 reduction system for CO production and indicates the potential of the PV-EC system for the EC reduction of CO2 to value-added chemicals.

SUBMITTER: Bae H 

PROVIDER: S-EPMC8945059 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature

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Nanostructured Au Electrode with 100 h Stability for Solar-Driven Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide.

Bae Hyojung H   Seong Chaewon C   Burungale Vishal V   Seol Myeongheon M   Yoon Chul Oh CO   Kang Soon Hyung SH   Jung Wan-Gil WG   Kim Bong-Joong BJ   Ha Jun-Seok JS  

ACS omega 20220228 11

Solar-to-chemical energy conversion is a potential alternative to fossil fuels. A promising approach is the electrochemical (EC) reduction of CO<sub>2</sub> to value-added chemicals, particularly hydrocarbons. Here, we report on the selective EC reduction of CO<sub>2</sub> to CO on a porous Au nanostructure (pAu) cathode in 0.1 M KHCO<sub>3</sub>. The pAu cathode anodized at 2.6 V exhibited maximum Faradaic efficiency (FE) for conversion of CO<sub>2</sub> to CO (up to 100% at -0.75 V vs reversib  ...[more]

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