Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (7): 20220272.doi: 10.7503/cjcu20220272

• Article • Previous Articles     Next Articles

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)

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

CLC Number: 

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