Porous Bilayer Electrode‐Guided Gas Diffusion for Enhanced CO2 Electrochemical Reduction

Advanced Energy & Sustainability Research

Terence Xiaoteng Liu¹  Yucheng Wang¹  Hanhui Lei¹  Yongqing Fu¹  Ben Bin Xu¹  Chao Gao²  Chenxi Xu³  Hang Xiang³  Eileen Hao Yu³  Yinzhu Jiang⁴ 

[1] Faculty of Engineering and Environment Northumbria University Newcastle Upon Tyne NE1 8ST UK;MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province Zhejiang University 38 Zheda Road Hangzhou 310027 P. R. China;School of Engineering Newcastle University Newcastle Upon Tyne NE1 7RU UK;School of Materials Science and Engineering State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 P. R. China;

关键词: CO2 reduction reaction;    gas diffusion electrodes;    graphene aerogels;    mass transfer;   

DOI  :  10.1002/aesr.202100083

来源: DOAJ

【 摘 要 】

Comparing with the massive efforts in developing innovative catalyst materials system and technologies, structural design of cells has attracted less attention on the road toward high‐performance electrochemical CO2 reduction reaction (eCO2RR). Herein, a hybrid gas diffusion electrode‐based reaction cell is proposed using highly porous carbon paper (CP) and graphene aerogels (GAs), which is expected to offer directional diffusion of gas molecules onto the catalyst bed, to sustain a high performance in CO2 conversion. The above‐mentioned hypothesis is supported by the experimental and simulation results, which show that the CP + GA combined configuration increases the Faraday efficiency (FE) from ≈60% to over 94% toward carbon monoxide (CO) and formate production compared with a CP only cell with Cu2O as the catalyst. It also suppresses the undesirable side reaction–hydrogen evolution over 65 times than the conventional H‐type cell (H‐cell). By combining with advanced catalysts with high selectivity, a 100% FE of the cell with a high current density can be realized. The described strategy sheds an extra light on future development of eCO2RR with a structural design of cell‐enabled high CO2 conversion.

【 授权许可】

Unknown