Corresponding Author

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


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-Co5.47N/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


cobalt nitride, carbon dioxide electroreduction, carbon monoxide, syngas

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