Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (7): 20240082.doi: 10.7503/cjcu20240082

• Physical Chemistry • Previous Articles     Next Articles

Preparation of Defect Sites Rich CuAg Catalyst for CO2 Reduction to C2+ Products

JING Huifang1, LIU Yi1, FANG Qiang1, LANG Xuelei1, HAO Genyan2, ZHONG Dazhong1(), LI Jinping1, ZHAO Qiang1()   

  1. 1.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China
    2.College of Energy Engineering,Shanxi College of Technology,Shuozhou 036000,China
  • Received:2024-02-19 Online:2024-07-10 Published:2024-05-13
  • Contact: ZHONG Dazhong, ZHAO Qiang E-mail:zhongdazhong@tyut.edu.cn;zhaoqiang@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22308246);the Central Government Guides the Special Fund Projects of Local Scientific and Technological Development, China(YDZISX20231A015);the Fundamental Research Program of Shanxi Province, China(202203021212266)

Abstract:

In this paper, defect sites rich Ag/Cu-OH was obtained by electrochemical reduction of Ag/Cu(OH)2 for efficient carbon dioxide reduction reaction(CO2RR) to C2+ products. The defect sites rich Ag/Cu-OH gives a superior activity than Ag/Cu-O obtained from the reduction of Ag/CuO precursor. The electrocatalytic performance of the catalyst was evaluated in the H-cell, and Ag2%/Cu-OH showed 1.5 times higher ethylene(C2H4) Faradaic efficiency(FE) and 1.3 times higher C2+ Faraday efficiency than Ag2%/Cu-O. We obtained a high C2H4 FE of 56.2% on Ag2%/Cu-OH in the membrane electrode assembly(MEA) electrolyze at the high current density of 375 mA/cm2. The improved performance of Ag2%/Cu-OH can be attributed not only to the synergistic effect between Cu and Ag, but also to the presence of more low coordination Cu defect sites, which facilitate the adsorption of CO and further promote the dimerization of *CO to C2+ products.

Key words: Carbon dioxide reduction reaction(CO2RR), Electrocatalysis, Defect site, C2H4 product, C2+ product

CLC Number: 

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