材料科学
纳米反应器
选择性
电化学
法拉第效率
催化作用
拉曼光谱
镍
化学工程
纳米技术
电极
纳米颗粒
化学
物理化学
冶金
物理
工程类
光学
生物化学
作者
Jia Song,Hongbo Zhang,Rongbo Sun,Peigen Liu,Xianhui Ma,Cai Chen,Wenxin Guo,Xusheng Zheng,Huang Zhou,Yushi Gao,Wen‐Gang Cui,Hongge Pan,Zhuhua Zhang,Yuen Wu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-04-16
标识
DOI:10.1021/acsnano.4c01599
摘要
CO plays a crucial role as an intermediate in electrochemical CO2 conversion to generate multicarbon (C2+) products. However, optimizing the coverage of the CO intermediate (*CO) to improve the selectivity of C2+ products remains a great challenge. Here, we designed a hierarchically structured double hollow spherical nanoreactor featuring atomically dispersed nickel (Ni) atoms as the core and copper (Cu) nanoparticles as the shell, which can greatly improve the catalytic activity and selectivity for C2+ compounds. Within this configuration, CO generated at the active Ni sites on the inner layer accumulates in the cavity before spilling over neighboring Cu sites on the outer layer, thus enhancing CO dimerization within the cavity. Notably, this setup achieves a sustained faradaic efficiency of 74.4% for C2+ production, with partial current densities reaching 337.4 mA cm–2. In situ Raman spectroscopy and finite-element method (FEM) simulations demonstrate that the designed local CO generator can effectively increase the local CO concentration and restrict CO evolution, ultimately boosting C–C coupling. The hierarchically ordered architectural design represents a promising solution for achieving highly selective C2+ compound production in the electroreduction of CO2.
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