标题: A general descriptor for guiding the electrolysis of CO₂ in molten carbonate

作者: Yang, ZS (Yang, Zhengshan); Deng, BW (Deng, Bowen); Du, KF (Du, Kaifa); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)

来源出版物: GREEN ENERGY & ENVIRONMENT  卷: 9  期: 4  页: 748-757  DOI: 10.1016/j.gee.2022.09.011  Published Date: 2024 APR  

摘要: 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-, Ti5O 8cathode 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-electrodereaction relationship, thereby providing fundamental insights into guiding molten carbonate CO2 electrolysis. (c) 2022 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

作者关键词: Molten carbonate; CO 2 activity; CO 2 RR; Electrolyte engineering; Carbon

地址: [Yang, Zhengshan; Deng, Bowen; Du, Kaifa; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

通讯作者地址: Yin, HY; Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

电子邮件地址: yinhuayi@whu.edu.cn; wangdh@whu.edu.cn

影响因子：13.3