Corresponding Author

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


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


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

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