Integrating hydrogen utilization in CO2 electrolysis with reduced energy loss

Xiaoyi Jiang, Le Ke, Kai Zhao, Xiaoyu Yan, Hongbo Wang, Xiaojuan Cao, Yuchen Liu, Lingjiao Li, Yifei Sun, Zhiping Wang, Dai Dang and Ning Yan ()
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Xiaoyi Jiang: Wuhan University
Le Ke: Wuhan University
Kai Zhao: Wuhan University
Xiaoyu Yan: Wuhan University
Hongbo Wang: Wuhan University
Xiaojuan Cao: Wuhan University
Yuchen Liu: Wuhan University
Lingjiao Li: Wuhan University
Yifei Sun: Shenzhen Research Institute of Xiamen University
Zhiping Wang: Wuhan University
Dai Dang: Guangdong University of Technology
Ning Yan: Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Electrochemical carbon dioxide reduction reaction using sustainable energy is a promising approach of synthesizing chemicals and fuels, yet is highly energy intensive. The oxygen evolution reaction is particularly problematic, which is kinetically sluggish and causes anodic carbon loss. In this context, we couple CO2 electrolysis with hydrogen oxidation reaction in a single electrochemical cell. A Ni(OH)2/NiOOH mediator is used to fully suppress the anodic carbon loss and hydrogen oxidation catalyst poisoning by migrated reaction products. This cell is highly flexible in producing either gaseous (CO) or soluble (formate) products with high selectivity (up to 95.3%) and stability (>100 h) at voltages below 0.9 V (50 mA cm−2). Importantly, thanks to the “transferred” oxygen evolution reaction to a water electrolyzer with thermodynamically and kinetically favored reaction conditions, the total polarization loss and energy consumption of our H2-integrated CO2 reduction reaction, including those for hydrogen generation, are reduced up to 22% and 42%, respectively. This work demonstrates the opportunity of combining CO2 electrolysis with the hydrogen economy, paving the way to the possible integration of various emerging energy conversion and storage approaches for improved energy/cost effectiveness.

Date: 2024
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DOI: 10.1038/s41467-024-45787-x

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