Preparation of Ni(dpim)₂Cl₂ Complex for the Electrocatalytic Reduction of CO₂

Authors

Li-pu ZHANG, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
Dong-fang NIU, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
Xin-sheng ZHANG, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;Follow

Corresponding Author

Xin-sheng ZHANG(xszhang@ecust.edu.cn)

Abstract

A new Ni(dpim)₂Cl₂complex using 2-(diphenylphosphino)-1-methylimidazole (dpim) as ligand was prepared and served as a catalyst for the electrochemical reduction of CO₂. The electrochemical redox behavior of Ni(dpim)₂Cl₂ in CH₃CN/TPABF₄ solution under nitrogen atmosphere showed the two-electron irreversible reduction at -0.7 V and one-electron quasi-reversible reduction at -1.3 V. After bubbling CO₂ into the electrolyte, the reduction peak appeared at -1.3 V became irreversible and the peak current increased from 0.48 mA·cm^-2 to 0.55 mA·cm^-2. Moreover, the peak current at -1.3 V could further increase to 0.72 mA·cm^-2 in the presence of proton source (CH₃OH). These observations indicate that the Ni(dpim)₂Cl₂ exhibited a good electrocatalytic performance toward CO₂ reduction and the electrocatalytic reduction process followed the ECE mechanism. The reduction products obtained by the potentiostatic electrolysis (at -1.3 V) were identified to be mainly CO with the catalytic conversion frequency of 0.17 s^-1.

Graphical Abstract

Keywords

Ni(dpim)2Cl2, methanol, CO2, electrocatalysis

DOI Link

https://doi.org/10.13208/j.electrochem.170401

Publication Date

2018-04-28

Online Available Date

2017-05-11

Revised Date

2017-05-09

Received Date

2017-04-04

Recommended Citation

Li-pu ZHANG, Dong-fang NIU, Xin-sheng ZHANG. Preparation of Ni(dpim)₂Cl₂ Complex for the Electrocatalytic Reduction of CO₂[J]. Journal of Electrochemistry, 2018 , 24(2): 103-110.
DOI: 10.13208/j.electrochem.170401
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss2/1