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Electrochemical reduction of CO2 to ethanol using copper nanofoam electrode and 1-butyl-3-methyl-imidazolium bromide as the homogeneous co-catalyst

Reyhaneh Fazel Zarandi, Behzad Rezaei, Hassan S. Ghaziaskar, Ali Asghar Ensafi

 

A B S T R A C T
In this research, an electrochemical system, based on copper nanofoam accompanied by 1-butyl-3-methyl-imidazolium bromide (BMIMB) as the homogeneous co-catalyst for the electrochemical conversion of CO2 at ambient pressure and temperature was developed. Although, there have been some efforts for utilization of copper nanofoam or imidazolium-based catalysts toward the electro-reduction of CO2, evaluation of both catalysts to take advantage of the potential synergic effect of their combination would be an interesting aspect. The electroreduction of CO2 in a CO2 saturated 0.1M KHCO3 electrolyte was optimized based on the highest CO2 conversion efficiency in various conditions. The results show that the copper nanoporous foam, deposited for 45 s with the contribution of 40mM BMIMB at -1.6 V vs. Ag/ AgCl would effectively reduce CO2 and demonstrate a high CO2 faradaic efficiency i.e. more than 46% improvement, compared to similar previously reported experiment. The results confirm the applicability of this experiment as a developed method for efficient CO2 reduction.

 

Keywords:
Copper nanofoam, Co-catalyst, BMIMB, Faradaic efficiency, Electrochemical reduction of CO2

Journal Papers
Month/Season: 
June
Year: 
2019

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