Imaging Science and Photochemistry ›› 2019, Vol. 37 ›› Issue (2): 107-117.DOI: 10.7517/issn.1674-0475.181208

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Niobium Nitride Catalyst for Electrocatalytic Reduction of CO2

LI Wenting1,3, HOU Pengfei1,3, KANG Peng1,2,3   

  1. 1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
    2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, P. R. China;
    3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2018-12-26 Revised:2019-01-08 Online:2019-03-15 Published:2019-03-15
  • Supported by:
    National Key R&D Projects of China (2016YFB0600901)

Abstract: Converting CO2 to CO by electrochemical method is considered as an economic and friendly strategy to solve problems of resource and environment. In this work, precursor of niobium/carbon was prepared by wet chemical method and converted into Nb4N5/C and Nb2O5/C after calcination under NH3 and Ar respectively. When the nitriding temperature reaches to 700℃, prepared Nb4N5/C exhibits excellent catalytic activity with CO Faradaic efficiency of 57% at -0.83 V vs RHE in CO2 saturated 0.5 mol·L-1 NaCl solution. The results show that the catalytic activity of Nb4N5/C is related to the N doping in Nb4N5.

Key words: niobium nitride, electrocatalysis, CO2 reduction, CO