高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (7): 20220272.doi: 10.7503/cjcu20220272

• 研究论文 • 上一篇    下一篇

吡咯氮配位单原子铜催化剂的电催化二氧化碳还原性能

赵润瑶1,2, 纪桂鹏1, 刘志敏1,2()   

  1. 1.中国科学院化学研究所, 北京分子科学国家研究中心, 中国科学院胶体、 界面与化学热力学重点实验室, 中国科学院分子科学科教融合卓越创新中心,北京 100190
    2.中国科学院大学, 北京 100049
  • 收稿日期:2022-04-24 出版日期:2022-07-10 发布日期:2022-05-29
  • 通讯作者: 刘志敏 E-mail:liuzm@iccas.ac.cn
  • 基金资助:
    国家自然科学基金(22121002)

Efficient Electrocatalytic CO2 Reduction over Pyrrole Nitrogen-coordinated Single-atom Copper Catalysts

ZHAO Runyao1,2, JI Guipeng1, LIU Zhimin1,2()   

  1. 1.Beijing National Laboratory for Molecular Sciences(BNLMS),CAS Key Laboratory of Colloid,Interface and Chemical Thermodynamics,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-04-24 Online:2022-07-10 Published:2022-05-29
  • Contact: LIU Zhimin E-mail:liuzm@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22121002)

摘要:

采用温度控制的浸渍-热解法, 合成了以碳纳米管为载体的一系列铜单原子催化剂. 扩展X射线吸收精细结构(EXAFS)分析表明, 催化剂中的单原子铜位点分别由吡啶氮和吡咯氮配位. 电催化性能测试表明, 所制备催化剂可用于电催化二氧化碳生成一氧化碳, 由吡啶氮配位的铜单原子催化剂的反应选择性较差, 而由吡咯氮配位的铜单原子催化剂则具有更强的活性, CO法拉第效率在-0.70 V(vs. RHE)时可达到96.3%; 吡咯氮配位的铜单原子中心对于析氢反应具有更好的抑制效果.

关键词: 单原子催化剂, 碳纳米管, 扩展X射线吸收精细结构, 电催化二氧化碳还原, 一氧化碳

Abstract:

A series of carbon nanotube supported copper single-atom catalysts(SACu/CNT-x) was synthesized by a temperature-controlled impregnation-pyrolysis method. Extended X-ray absorption fine structure(EXAFS) analysis indicates that the single-atom copper sites were coordinated with pyridinic-N and pyrrolic-N, respectively, in the catalysts. The catalysts were applied in electrocatalytic carbon dioxide reduction. It was indicated that the catalyst with pyrrole N-coordinated copper single-atom sites showed high activity for CO2 electroreduction, affording a high CO Faradaic efficiency of 96.3% at -0.70 V(vs.RHE). Electrochemical experiments show that the pyrrole N-coordinated copper single-atom center has a good inhibitory effect on the hydrogen evolution reaction.

Key words: Single-atom catalyst, Carbon nanotubes, EXAFS, Electrocatalytic carbon dioxide reduction, CO

中图分类号: 

TrendMD: