中国科学院化学所韩布兴团队报道了点阵应变工程促进CO₂电还原为C₂₊产品。相关研究成果发表在2024年7月1日出版的《德国应用化学》。

调节电极材料表面和反应中间体之间的结合效应，对于高效CO₂电还原生产高价值多碳（C₂₊）化合物至关重要。理论研究表明，单组分Cu催化剂中的晶格拉伸应变可以减少*CO中间体之间的偶极-偶极排斥，促进*OH吸附，而高的*CO和*OH覆盖率降低了C–C耦合的能垒。

该文中，研究人员通过电还原具有不同结晶度的CuO前体，在不添加任何额外组分的情况下，制备了具有不同晶格拉伸应变的Cu催化剂。将制备的单组分Cu催化剂用于CO₂电还原，发现Cu中的晶格拉伸应变可以有效地提高C₂₊产物的法拉第效率。特别地，所制备的具有高晶格拉伸应变的CuTPA催化剂在1.25V vs.RHE下，以486.1mAcm^-2的部分电流密度实现了90.9%的FEC₂₊。

附：英文原文

Title: Lattice Strain Engineering Boosts CO2 Electroreduction to C2+ Products

Author: Jiapeng Jiao, Xinchen Kang, Jiahao Yang, Shuaiqiang Jia, Xiao Chen, Yaguang Peng, Chunjun Chen, Xueqing Xing, Zhongjun Chen, Mingyuan He, Haihong Wu, Buxing Han

Issue&Volume: 2024-07-01

Abstract: Regulating the binding effect between the surface of an electrode material and reaction intermediates is essential in highly efficient CO2 electro-reduction to produce high-value multicarbon (C2+) compounds. Theoretical study reveals that lattice tensile strain in single-component Cu catalysts can reduce the dipole–dipole repulsion between *CO intermediates and promotes *OH adsorption, and the high *CO and *OH coverage decreases the energy barrier for C–C coupling. In this work, Cu catalysts with varying lattice tensile strain were fabricated by electro-reducing CuO precursors with different crystallinity, without adding any extra components. The as-prepared single-component Cu catalysts were used for CO2 electro-reduction, and it is discovered that the lattice tensile strain in Cu could enhance the Faradaic efficiency (FE) of C2+ products effectively. Especially, the as-prepared CuTPA catalyst with high lattice tensile strain achieves a FEC2+ of 90.9% at 1.25 V vs. RHE with a partial current density of 486.1 mA cm2.

DOI: 10.1002/anie.202409563

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202409563