首页|A general descriptor for guiding the electrolysis of CO2 in molten carbonate
A general descriptor for guiding the electrolysis of CO2 in molten carbonate
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Molten carbonate is an excellent electrolyte for the electrochemical reduction of CO2 to carbonaceous materials.However,the electrolyte-electrode-reaction relationship has not been well understood.Herein,we propose a general descriptor,the CO2 activity,to reveal the electrolyte-electrode-reaction relationship by thermodynamic calculations and experimental studies.Experimental studies agree well with theoretical predictions that both cations(Li+,Ca2+,Sr2+and Ba2+)and anions(BO2,Ti5O148-,SiO32-)can modulate the CO2 activity to control both cathode and anode reactions in a typical molten carbonate electrolyzer in terms of tuning reaction products and overpotentials.In this regard,the reduction of CO32-can be interpreted as the direct reduction of CO2 generated from the dissociated CO32-,and the CO2 activity can be used as a general descriptor to predict the electrode reaction in molten carbonate.Overall,the CO2 activity descriptor unlocks the electrolyte-electrode-reaction relationship,thereby providing fundamental insights into guiding molten carbonate CO2 electrolysis.
Zhengshan Yang、Bowen Deng、Kaifa Du、Huayi Yin、Dihua Wang
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School of Resource and Environmental Sciences,Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy,Wuhan University Wuhan,430072,China
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