Regulation of the Coordination Structures of Transition Metals on Nitrogen-Doped Carbon Nanotubes for Electrochemical CO2 Reduction

Yongyong Cao; Yuxiao Meng; Yuting Wu; Zhangfeng Shen; Qineng Xia; Hong Huang; Jian-Ping Lang; Hongwei Gu; Yangang Wang; Xi Li

doi:10.1021/acs.inorgchem.2c03221

Regulation of the Coordination Structures of Transition Metals on Nitrogen-Doped Carbon Nanotubes for Electrochemical CO₂ Reduction

Inorg Chem. 2022 Nov 28;61(47):18957-18969. doi: 10.1021/acs.inorgchem.2c03221. Epub 2022 Nov 14.

Authors

Yongyong Cao¹, Yuxiao Meng^{1

2}, Yuting Wu¹, Zhangfeng Shen¹, Qineng Xia¹, Hong Huang¹, Jian-Ping Lang³, Hongwei Gu³, Yangang Wang¹, Xi Li¹

Affiliations

¹ College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, P. R. China.
² Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, P. R. China.
³ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, P. R. China.

PMID: 36374189
DOI: 10.1021/acs.inorgchem.2c03221

Abstract

The electrochemical carbon dioxide reduction reaction (CO₂RR) has been extensively studied due to its potential to reduce the globally accelerating CO₂ emission and produce value-added chemicals and fuels. Despite great efforts to optimize the catalyst activity and selectivity, the development of robust design criteria for screening the catalysts and understanding the role of water and potassium for CO₂ activation poses a significant challenge. Herein, a rapid method for screening single-atom catalysts (SACs) possessing different coordination structures toward the CO₂RR process to form CO, namely, a metal atom supported on nitrogen-doped carbon nanotubes (M@CNT, M@1N_CNT, M@2N_CNT, and M@3N_CNT), was established using large-scale density functional theory computations. Adopting the free energy of *CO₂ and *OH as screening descriptors, Fe@CNT, Cu@1N_CNT, Pd@2N_CNT, and Ni@3N_CNT were found to exhibit high activity for CO in the gas phase with the overpotential values of 0.22, 0.11, 0.13, and 0.05 V, respectively. Water and potassium present on the surface of the active sites can accelerate the activation of CO₂ relative to the gas phase. Ni@3N_CNT shows the highest activity and selectivity in the environment having four water and one potassium. Particularly, the least absolute shrinkage and selection operator regression study revealed that the CO₂ adsorption is intrinsically governed by the number of electrons lost by the metal atom in the three N-doped systems, which can be correlated to the distance of the metal atom from the plane of the coordination atom in the M@CNT system. Besides, the study proposes equations for the calculation of the free energy of CO₂ adsorption. The current work not only advances the exploration of highly active SACs for the heterogeneous electrocatalytic systems for CO₂RR but also highlights the significance of water and potassium in the aqueous solution.