SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 64 ›› Issue (12): 156-167.DOI: 10.1016/j.cjche.2023.06.022

• Full Length Article • 上一篇    下一篇

Construction of CuNiAl-LDHs electrocatalyst with rich-Cu+ and —OH for highly selective reduction of CO2 to methanol

Gaiqin Miao, Lifei Liu, Xia An, Xu Wu   

  1. College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, China
  • 收稿日期:2023-02-22 修回日期:2023-06-07 出版日期:2023-12-28 发布日期:2024-02-05
  • 通讯作者: Xu Wu,E-mail:wuxu@tyut.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (51978436, 22272116).

Construction of CuNiAl-LDHs electrocatalyst with rich-Cu+ and —OH for highly selective reduction of CO2 to methanol

Gaiqin Miao, Lifei Liu, Xia An, Xu Wu   

  1. College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2023-02-22 Revised:2023-06-07 Online:2023-12-28 Published:2024-02-05
  • Contact: Xu Wu,E-mail:wuxu@tyut.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51978436, 22272116).

摘要: In this work, a high-performance CuNiAl-LDHs catalyst was innovatively synthesized for electrochemical carbon dioxide reduction (CO2RR) of methanol (CH3OH) through the modulated synthesis of Cu-based layered double hydroxide (LDHs). It was found that the optimal CuNiAl-LDHs has superior CH3OH selectivity compared to CuAl-LDHs and CuMgAl-LDHs, with the Faraday efficiency (FE) of 76.4% for CH3OH generation at -1.2 V. And their FE and current density (4.8 mA·cm-2) remained stable during up to 24 h of electrolysis. Meanwhile, this study confirms the significant performance advantages of CuNiAl-LDHs over their derived composite oxides. Series characterization further proves that the excellent catalytic performance of CuNiAl-LDHs is importantly associated with their richness in Cu+ and hydroxyl group (—OH). The research expands the application fields of LDHs compounds. Meanwhile, the series of discoveries provide a new insight for the preparation of CH3OH by constructing CO2RR.

关键词: Electrocatalysis, CO2 reduction, Methanol, CuNiAl layered-double hydroxides, Hydroxyl group

Abstract: In this work, a high-performance CuNiAl-LDHs catalyst was innovatively synthesized for electrochemical carbon dioxide reduction (CO2RR) of methanol (CH3OH) through the modulated synthesis of Cu-based layered double hydroxide (LDHs). It was found that the optimal CuNiAl-LDHs has superior CH3OH selectivity compared to CuAl-LDHs and CuMgAl-LDHs, with the Faraday efficiency (FE) of 76.4% for CH3OH generation at -1.2 V. And their FE and current density (4.8 mA·cm-2) remained stable during up to 24 h of electrolysis. Meanwhile, this study confirms the significant performance advantages of CuNiAl-LDHs over their derived composite oxides. Series characterization further proves that the excellent catalytic performance of CuNiAl-LDHs is importantly associated with their richness in Cu+ and hydroxyl group (—OH). The research expands the application fields of LDHs compounds. Meanwhile, the series of discoveries provide a new insight for the preparation of CH3OH by constructing CO2RR.

Key words: Electrocatalysis, CO2 reduction, Methanol, CuNiAl layered-double hydroxides, Hydroxyl group