标题: Buffering electrolyte alkalinity for highly selective and energy-efficient transformation of CO2 to CO
作者: Hu, LY (Hu, Liangyou); Deng, BW (Deng, Bowen); Yang, ZS (Yang, Zhengshan); Wang, DH (Wang, Dihua)
来源出版物: ELECTROCHEMISTRY COMMUNICATIONS 卷: 121 文献号: 106864 DOI: 10.1016/j.elecom.2020.106864 出版年: DEC 2020
摘要: Electroreduction of CO2 to value-added products is a promising strategy for renewable energy storage using a carbon-neutral cycle. In this work, we report a feasible electrochemical approach to achieving highly efficient CO2-to-CO conversion by buffering electrolyte alkalinity in borate-containing molten salts, where borates acting as a buffer system can regulate the concentration of sequentially released O-2(-) (defined as a base) in the electrolyte, changing the thermodynamic reaction pathway of the CO2 reduction reaction (CO2RR). Taking the CO2RR in LiBO2-containing molten LiCl-Li2CO3 as an example, CO is more preferentially generated in this medium compared with a borate-free electrolyte (where mainly carbon products are produced). The faradaic efficiency for producing CO was over 90% at a current density of 100 mA/cm(2), with a very low energy consumption of 1.06 kWh/Nm(3)-CO at a relatively low temperature (650 degrees C). This facile and energy-efficient strategy suggests an approach to steering the CO2RR toward desired products with improved energy efficiency.
作者关键词: CO2 reduction; Molten salt electrolysis; Borate; Buffering effect; CO
地址: [Hu, Liangyou; Deng, Bowen; Yang, Zhengshan; 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: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
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