标题: Electrochemical CO<sub>2</sub> Reduction in Deep Eutectic Solvent: Effect of Water and Organic Diluents
作者: Tong, JS (Tong, Jiasheng); Wang, M (Wang, Miao); Qiu, XJ (Qiu, Xuejun); Li, SZ (Li, Shizhen); Yang, HQ (Yang, Hangqi); Peng, C (Peng, Chuang)
来源出版物: ACS SUSTAINABLE CHEMISTRY & ENGINEERING 卷: 12 期: 37 页: 13937-13945 DOI: 10.1021/acssuschemeng.4c04707 Early Access Date: SEP 2024 Published Date: 2024 SEP 2
摘要: Deep eutectic solvents (DESs) are promising media for CO2 electroreduction because of their high CO2 solubility, low cost, and eco-friendliness. However, the high viscosity and poor ionic conductivity severely limit their applications. In this study, low-viscosity polar aprotic solvents, propylene carbonate (PC) and sulfolane (SL), were used as diluents in Ethaline (ChCl:2EG) to prepare mixed electrolytes for electrochemical CO2 reduction. Raman and infrared spectra indicate that PC and SL can participate in the eutectic network of Ethaline through intermolecular hydrogen bonding, thereby decreasing the viscosity. The current density of the Ag cathode increases from 1.7 to 8.0 and 5.3 mA/cm(2) with the addition of PC and SL, respectively. The two diluents also result in improved CO faradaic efficiency (FECO) and suppressed HER because the C=O and S=O bonds in the molecular frameworks of PC and SL can disrupt the hydrogen bonds of accumulated water molecules during electrolysis. At -2.0 V, FECO increases from 63% to over 90% upon the addition of PC and SL. This study provides new insights into the design of high-performance DES electrolytes for CO2 electroreduction.
作者关键词: electrochemical CO2 reduction; deep eutecticsolvent; polar aprotic solvent; diluent; water effect
地址: [Tong, Jiasheng; Wang, Miao; Li, Shizhen; Yang, Hangqi; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
[Qiu, Xuejun] Guangdong Pharmaceut Univ, Sch Hlth Sci, Guangzhou 510006, Peoples R China.
通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
电子邮件地址: chuang.peng@whu.edu.cn
影响因子：7.1
