Jiang Yong, Zhong Dazhong, Wang Lei, Li Jiayuan, Hao Genyan, Li Jinping, Zhao Qiang
College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, P. R. China.
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan, 030024, Shanxi, P. R. China.
Chem Asian J. 2022 Jul 15;17(14):e202200380. doi: 10.1002/asia.202200380. Epub 2022 May 31.
Electrochemical reduction of CO to produce valuable multi-carbon products is a promising avenue for promoting CO conversion and achieving renewable energy storage, and it has also attracted considerable attention recently. However, the synthesis of Cu electrode with a controllable electrochemical active surface area (ECSA) to understand its role in CO reduction to C H remains challenging. Herein, a series of Cu electrodes with different ECSA is synthesized through a simple oxidation-reduction approach. We reveal that the improved selectivity of C H is proportional to the ECSA of Cu in the low ECSA range, and a further increase in ECSA has a negligible effect on its selectivity. The enlarged surface area could strengthen the local pH effect near the surface of Cu electrode and suppress the generation of C products as well as H . The study provides a feasible strategy to rationally design electrocatalysts with high electrochemical CO reduction performances.
通过电化学还原CO来生产有价值的多碳产物是促进CO转化和实现可再生能源存储的一条有前景的途径，并且最近也引起了相当大的关注。然而，合成具有可控电化学活性表面积（ECSA）的铜电极以了解其在CO还原为C₂H₄中的作用仍然具有挑战性。在此，通过一种简单的氧化还原方法合成了一系列具有不同ECSA的铜电极。我们发现，在低ECSA范围内，C₂H₄选择性的提高与铜的ECSA成正比，而ECSA的进一步增加对其选择性影响可忽略不计。增大的表面积会增强铜电极表面附近的局部pH效应，并抑制C₂产物以及H₂的生成。该研究提供了一种合理设计具有高电化学CO还原性能的电催化剂的可行策略。
