Efficient electrocatalytic CO2 reduction to C2+ chemicals on internal porous copper

作者：Sha Wang, Jianling Zhang, Lei Yao, Yisen Yang, Lirong Zheng, Bo Guan, Yingzhe Zhao, Yanyue Wang, Buxing Han, Xueqing Xing · 发表于：Nano Research · 年份：2023 · DOI：10.1007/s12274-023-5791-y · 被引用次数：19 · 研究领域：CO2 Reduction Techniques and Catalysts、Electrocatalysts for Energy Conversion、Ionic liquids properties and applications

To improve the electrocatalytic conversion of carbon dioxide (CO 2 ) into C 2+ products (such as ethylene (C 2 H 4 ) and ethanol (CH 3 CH 2 OH), etc.) is of great importance, but remains challenging. Herein, we proposed a strategy that directs the C-C coupling pathway through enriching and confining the carbon monoxide (CO) intermediate to internal pores of Cu nanocubes, for electrocatalytic reduction of CO 2 into C 2+ chemicals. In H-type cell, the Faraday efficiency (FE) for ethylene and ethanol reaches 70.3% at −1.28 V versus the reversible hydrogen electrode (vs. RHE), with a current density of 47.9 mA·cm −2 . In flow cell, the total current density is up to 340.3 mA·cm −2 at −2.38 V (vs. RHE) and the FE for C 2+ products is 67.4%. Experimental and theoretical studies reveal that both the CO intermediate adsorption and C-C coupling reaction on such an internal porous catalyst are facilitated, thus improving CO 2 -to-C 2+ conversion efficiency.