标题: Selective CO2 Electroreduction with Enhanced Oxygen Evolution Efficiency in Affordable Borate-Mediated Molten Electrolyte

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

来源出版物: ACS ENERGY LETTERS DOI: 10.1021/acsenergylett.3c00082提前访问日期: MAR 2023

摘要: The renewable-electricity-driven carbon dioxide reduction reaction (CO2RR) is potentially a pathway to closing the anthropogenic carbon cycle; however, it is challenging to couple a fast cathodic CO2RR that endows tunable selectivity with a kinetically matched anodic oxygen evolution reaction (OER) at a promising energy efficiency. Here, we report a cost-effective strategy to convert CO2 into C/CO (tunable selectivity of over 70%) with enhanced OER kinetics in water-soluble Na-K-based molten carbonate by modulating the electrolyte's oxo-acidity using earth-abundant borax (Na2B4O7) as an electrolyte additive, where the borates acting as O2- (an oxo-base) shuttles that constantly mediate between cathode and anode can concurrently facilitate CO2RR and OER. In particular, it can respectively sustain CO2RR at a stable current density of 100 mA cm-2 with a considerable OER current density of similar to 300 mA cm-2. The optimal energy efficiency can reach up to over 60%, opening avenues for efficiently manipulating CO2RR and simultaneously enhancing OER.

地址: [Yang, Zhengshan; Deng, Bowen; Hu, Liangyou; 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: Deng, BW; 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: bwdeng@whu.edu.cn; wangdh@whu.edu.cn

影响因子：23.991