Metal-organic framework-derived silver/copper-oxide catalyst for boosting the productivity of carbon dioxide electrocatalysis to ethylene

被引:2
|
作者
Sun, Bo [1 ]
Cheng, Haoyan [1 ]
Shi, Changrui [1 ]
Guan, Jiangyi [1 ]
Jiang, Zhonghan [1 ]
Ma, Shuaiyu [1 ]
Song, Kexing [1 ,2 ]
Hu, Hao [1 ]
机构
[1] Henan Univ Sci & Technol, Collaborat Innovat Ctr Nonferrous Met, Luoyang 471023, Peoples R China
[2] Henan Acad Sci, Mat Res Inst, Zhengzhou 450002, Peoples R China
基金
中国国家自然科学基金;
关键词
Porous carbon confinement; Cu-Ag bimetals; Heterostructures; Multi-carbon products; Energy conversion; CO2; electroreduction; ELECTROCHEMICAL CO2 REDUCTION; CONSTRUCTION; CU2O;
D O I
10.1016/j.jcis.2024.10.014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrochemical reduction of CO2 2 into valuable multi-carbon (C2) 2 ) chemicals holds promise for mitigating CO2 2 emissions and enabling artificial carbon cycling. However, achieving high selectivity remains challenging due to the limited activity and active sites of C-C - C coupling catalysts. Herein, we report an Ag-modified Cu-oxide catalyst (CuO/Ag@C) derived from metal-organic frameworks (MOF), capable of efficiently converting CO2 2 to C2H4. 2 H 4 . The MOF-derived porous carbon confines the size of metal nanoparticles, ensuring sufficient exposure of active sites. Remarkably, the CuO/Ag@C catalyst achieves an impressive Faradaic efficiency of 48.6% for C2H4 2 H 4 at-0.7 V vs. RHE, demonstrating excellent stability. Both experimental results and theoretical calculations indicate that Ag sites promote the production of CO, enhancing the coverage of *CO on Cu sites. Furthermore, the reconfiguration of charge density at the Cu-Ag interface optimizes the electronic states of the reaction sites, reducing the formation energy of the key intermediate *OCCHO, thereby favoring C2H4 2 H 4 production effectively. This work provides insight into structurally rational catalyst design for highly active and selective multiphase catalysts.
引用
收藏
页码:615 / 623
页数:9
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