A Pair-Electrosynthesis for Formate at Ultra-Low Voltage Via Coupling of CO_(2) Reduction and Formaldehyde Oxidation  

作　　者：Mengyu Li Tehua Wang Weixing Zhao Shuangyin Wang Yuqin Zou 

机构地区：[1]State Key Laboratory of Chemo/Bio-Sensing and Chemometrics,College of Chemistry and Chemical Engineering,Advanced Catalytic Engineering Research Center of the Ministry of Education,Hunan University,Changsha 410082,People’s Republic of China [2]School of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第12期415-431,共17页纳微快报（英文版）

基　　金：This work was supported by the National Key R&D Program of China(2020YFA0710000);the National Natural Science Foundation of China(22122901,21902047);the Provincial Natural Science Foundation of Hunan(2020JJ5045,2021JJ20024,2021RC3054);the Shenzhen Science and Technology Program(JCYJ20210324140610028).

摘　　要：Formate can be synthesized electrochemically by CO_(2) reduction reaction(CO_(2)RR)or formalde-hyde oxidation reaction(FOR).The CO_(2)RR approach suffers from kinetic-sluggish oxygen evolution reac-tion at the anode.To this end,an electrochemical sys-tem combining cathodic CO_(2)RR with anodic FOR was developed,which enables the formate electrosynthesis at ultra-low voltage.Cathodic CO_(2)RR employing the BiOCl electrode in H-cell exhibited formate Faradaic efficiency(FE)higher than 90% within a wide potential range from−0.48 to−1.32 V_(RHE).In flow cell,the current density of 100 mA cm^(−2) was achieved at−0.67 V_(RHE).The anodic FOR using the Cu_(2)O electrode displayed a low onset potential of−0.13 V_(RHE) and nearly 100%formate and H_(2) selectivity from 0.05 to 0.35 V_(RHE).The CO_(2)RR and FOR were constructed in a flow cell through membrane electrode assembly for the electrosynthesis of formate,where the CO_(2)RR//FOR delivered an enhanced current density of 100 mA cm^(−2) at 0.86 V.This work provides a promising pair-electrosynthesis of value-added chemicals with high FE and low energy consumption.

关 键 词：Formate pair-electrolysis Electrochemical CO_(2)reduction Formaldehyde oxidation reaction Membrane electrode assembly Flow cell 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O646[理学—物理化学]