The role of oxygen-vacancy in bifunctional indium oxyhydroxide catalysts for electrochemical coupling of biomass valorization with CO2 conversion

Fenghui Ye, Shishi Zhang, Qingqing Cheng, Yongde Long, Dong Liu, Rajib Paul, Yunming Fang (), Yaqiong Su (), Liangti Qu, Liming Dai and Chuangang Hu ()
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Fenghui Ye: Beijing University of Chemical Technology
Shishi Zhang: Xi’an Jiaotong University
Qingqing Cheng: Chinese Academy of Sciences
Yongde Long: Beijing University of Chemical Technology
Dong Liu: Beijing University of Chemical Technology
Rajib Paul: Kent State University
Yunming Fang: Beijing University of Chemical Technology
Yaqiong Su: Xi’an Jiaotong University
Liangti Qu: Tsinghua University
Liming Dai: University of New South Wales
Chuangang Hu: Beijing University of Chemical Technology

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract Electrochemical coupling of biomass valorization with carbon dioxide (CO2) conversion provides a promising approach to generate value-added chemicals on both sides of the electrolyzer. Herein, oxygen-vacancy-rich indium oxyhydroxide (InOOH-OV) is developed as a bifunctional catalyst for CO2 reduction to formate and 5-hydroxymethylfurfural electrooxidation to 2,5-furandicarboxylic acid with faradaic efficiencies for both over 90.0% at optimized potentials. Atomic-scale electron microscopy images and density functional theory calculations reveal that the introduction of oxygen vacancy sites causes lattice distortion and charge redistribution. Operando Raman spectra indicate oxygen vacancies could protect the InOOH-OV from being further reduced during CO2 conversion and increase the adsorption competitiveness for 5-hydroxymethylfurfural over hydroxide ions in alkaline electrolytes, making InOOH-OV a main-group p-block metal oxide electrocatalyst with bifunctional activities. Based on the catalytic performance of InOOH-OV, a pH-asymmetric integrated cell is fabricated by combining the CO2 reduction and 5-hydroxymethylfurfural oxidation together in a single electrochemical cell to produce 2,5-furandicarboxylic acid and formate with high yields (both around 90.0%), providing a promising approach to generate valuable commodity chemicals simultaneously on both electrodes.

Date: 2023
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DOI: 10.1038/s41467-023-37679-3

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