标题: Tailoring Borate Mediator Species Enables Industrial COProduction with Improved Overall Energy Efficiency by Sustainable Molten Salt CO2 Electrolysis

作者: Li, XY (Li, Xinyu); Deng, BW (Deng, Bowen); Du, KF (Du, Kaifa); Li, WM (Li, Wenmiao); Chen, D (Chen, Di); Qu, X (Qu, Xin); Pang, FZ (Pang, Fangzhao); Zhang, XD (Zhang, Xiaodan); Zha, H (Zha, Hao); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)

来源出版物: ADVANCED SCIENCE DOI: 10.1002/advs.202406457 Early Access Date: DEC 2024 Published Date: 2024 DEC 4

摘要: The electrochemical conversion of CO2 into CO represents a promising strategy for mitigating excessive global greenhouse gas emissions. Nevertheless, achieving industrial-scale electrochemical CO2-to-CO conversion with enhanced selectivity and reduced energy consumption presents significant challenges. In this study, a borate-enhanced molten salt process for CO2 capture and electrochemical transformation is employed, achieving over 98% selectivity for CO and over 55% energy efficiency without the necessity for complex and costly electrocatalysts. Cathodic CO2 electro-reduction (CO2ER) with the anodic oxygen evolution reaction (OER) at an overall current density of 500 mA cm(-2) using non-nanostructured transition-metal plate electrodes at 650 degrees C is coupled. By regulating the electrolyte's oxo-basicity with earth-abundant borax (Na2B4O7), a borate-enhanced electrolyte is established that accelerates the overall electrochemical reaction efficiently. This system involved a series of well-designed target borate species (BO33-, BO2-, and B4O72-) that acted as mediators shuttling between the cathode and anode, favoring CO as the primary cathodic product. Manipulating the atmosphere above the anode facilitated a spontaneous transformation of borates, further enhancing OER performance with long-term operational stability over a cumulative period of 50 h, while also reducing overall energy consumption. This work presents a cost-effective strategy for the industrial-scale production of CO derived from CO2, contributing to a lower carbon footprint by establishing a sustainable borate-mediated closed loop.

作者关键词: CO production; electrochemical CO2 reduction; electrode processes; molten salt electrolysis; oxygen evolution reaction; reaction kinetics

KeyWords Plus: CARBON-DIOXIDE; MSCC-ET; IN-SITU; REDUCTION; CAPTURE; ELECTROREDUCTION; CONVERSION; NANOTUBES; OXYGEN

地址: [Li, Xinyu; Deng, Bowen; Du, Kaifa; Li, Wenmiao; Chen, Di; Qu, Xin; Pang, Fangzhao; Zhang, Xiaodan; Zha, Hao; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Li, Xinyu; Deng, Bowen; Du, Kaifa; Li, Wenmiao; Chen, Di; Qu, Xin; Pang, Fangzhao; Zhang, Xiaodan; Zha, Hao; Yin, Huayi; Wang, Dihua] Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

[Wang, Dihua] Wuhan Univ, State Key Lab Water Resources Engn & Management, 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, Wuhan 430072, Peoples R China.

Deng, BW; Wang, DH (通讯作者)，Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Wuhan Univ, State Key Lab Water Resources Engn & Management, Wuhan 430072, Peoples R China.

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

影响因子：14.3