Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (10): 20240203.doi: 10.7503/cjcu20240203

• Physical Chemistry • Previous Articles     Next Articles

Construction of Ni/N Co-doped Self-supported Carbon Foam Electrodes for Electrocatalytic CO2 Reduction

ZHU Jiajia, RUI Jialiang, SHI Wenwen, GAN Kaining, LI Hongqiang(), HE Xiaojun   

  1. School of Chemistry and Chemical Engineering,Anhui Key Laboratory of Coal Clean Conversion and High Valued Utilization,Anhui University of Technology,Maanshan 243002,China
  • Received:2024-04-22 Online:2024-10-10 Published:2024-07-18
  • Contact: LI Hongqiang E-mail:hqli2020@ahut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22108003);the Excellent Young Talents Fund of Higher Education Institutions of Anhui Province, China(2023AH030026);the College Student Innovation and Entrepreneurship Training Program of Anhui University of Technology, China(S202210360206)

Abstract:

A series of nickel/nitrogen co-doped self-supported carbon foam electrodes were prepared by impregnation, curing and carbonization using asphalt as the carbon source and polyurethane foam as the template, and then characterized by scanning electron microscopy, transmission electron microscopy, N2 adsorption-desorption analysis, Raman spectroscopy and X-ray photoelectron spectroscopy. The results show that the prepared carbon foam electrodes possess a three-dimensional macroporous skeleton structure. Moreover, their surface is abundant in defect sites and Ni—N coordination structures. The content of N species can be regulated by varying the carbonization temperature, thereby enabling the regulation of the content of Ni—N x active sites. The carbon foam electrodes were directly used as a self-supported electrode for the electroreduction of CO2, and a syngas with a stable and controllable H2/CO molar ratio could be obtained. The H2/CO molar ratio can be tuned from 1/2 to 2/1 within the potential window of ‒0.9~‒1.3 V(vs. RHE). In addition, the current density of the carbon foam electrode obtained at the carbonization temperature of 900 ℃ can be maintained at 5.7 mA/cm2 after a sustained reaction for 10 h, and the H2/CO molar ratio can be maintained at about 1/1.

Key words: Electrocatalytic CO2 reduction, Self-supported electrode, Syngas, Carbon foam

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