Electrocatalytic Reduction of Carbon Dioxide to Carbon Monoxide using Cobalt Nitride

Authors

Chen MA, University of Chinese Academy of Sciences,  Chinese Academy of Sciences, Beijing 100190, China;
Peng-fei HOU, University of Chinese Academy of Sciences,  Chinese Academy of Sciences, Beijing 100190, China;
Peng KANG, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)Follow

Corresponding Author

Peng KANG(kang.peng@tju.edu.cn)

Abstract

Electrocatalytic reduction of carbon dioxide (CO₂) is a promising method to alleviate global warming issues, although it still faces many challenges. Herein, we report cobalt nitride for electrocatalytic reduction of CO₂ to carbon monoxide (CO) in an aqueous electrolyte. A comparison of catalysts with different preparation temperatures and atmospheres suggests that nitrogen doping is critical to improve catalytic activity. For the most active catalyst of 700-Co_5.47N/C, the CO current density reached 9.78 mA·cm^-2 at potential of -0.7 V vs. RHE. In addition, the CO/H₂ ratio could be adjusted from 1:3 to 3:2 by changing applied potential. Tafel slope of 91 mV·dec^-1 indicates that forming a surface adsorbed CO2·- intermediate became the rate-determining step and nitriding strategy increased CO₂ selectivity by providing more base sites.

Graphical Abstract

Keywords

cobalt nitride, carbon dioxide electroreduction, carbon monoxide, syngas

DOI Link

https://doi.org/10.13208/j.electrochem.180941

Publication Date

2019-08-28

Online Available Date

2019-08-28

Revised Date

2018-12-16

Received Date

2018-10-08

Recommended Citation

Chen MA, Peng-fei HOU, Peng KANG. Electrocatalytic Reduction of Carbon Dioxide to Carbon Monoxide using Cobalt Nitride[J]. Journal of Electrochemistry, 2019 , 25(4): 180941.
DOI: 10.13208/j.electrochem.180941
Available at: https://jelectrochem.xmu.edu.cn/journal/vol25/iss4/6