Photoelectrochemical CO2 Reduction Products Over Sandwiched Hybrid Ga2O3:ZnO/Indium/ZnO Nanorods

Hye Ji Jang; Ju Hyun Yang; Ju Young Maeng; Min Hee Joo; Young Jun Kim; Choong Kyun Rhee; Youngku Sohn

doi:10.3389/fchem.2022.814766

Photoelectrochemical CO₂ Reduction Products Over Sandwiched Hybrid Ga₂O₃:ZnO/Indium/ZnO Nanorods

Front Chem. 2022 Feb 9:10:814766. doi: 10.3389/fchem.2022.814766. eCollection 2022.

Authors

Hye Ji Jang¹, Ju Hyun Yang^{1

2}, Ju Young Maeng¹, Min Hee Joo^{1

2}, Young Jun Kim¹, Choong Kyun Rhee¹, Youngku Sohn^{1

2}

Affiliations

¹ Department of Chemistry, Chungnam National University, Daejeon, South Korea.
² Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, South Korea.

Abstract

Recycled valuable energy production by the electrochemical CO₂ reduction method has explosively researched using countless amounts of developed electrocatalysts. Herein, we have developed hybrid sandwiched Ga₂O₃:ZnO/indium/ZnO nanorods (GZO/In/ZnO_NR) and tested their photoelectrocatalytic CO₂ reduction performances. Gas chromatography and nuclear magnetic spectroscopy were employed to examine gas and liquid CO₂ reduction products, respectively. Major products were observed to be CO, H₂, and formate whose Faradaic efficiencies were highly dependent on the relative amounts of overlayer GZO and In spacer, as well as applied potential and light irradiation. Overall, the present study provides a new strategy of controlling CO₂ reduction products by developing a sandwiched hybrid catalyst system for energy and environment.

Keywords: Ga2O3; ZnO nanorod; electrochemical CO2 reduction; indium; sandwiched hybrid.