Self-supported copper-based gas diffusion electrodes improve the local CO2 concentration for efficient electrochemical CO2 reduction

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Electrochemical CO2 reduction is a sustainable approach in green chemistry that enables the production of valuable chemicals and fuels while mitigating the environmental impact associated with CO2 emissions.Despite its several advantages,this technology suffers from an intrinsically low CO2 solubility in aqueous solutions,resulting in a lower local CO2 concentration near the electrode,which yields lower current densities and restricts product selectivity.Gas diffusion electrodes(GDEs),particularly those with tubular architectures,can solve these issues by increasing the local CO2 concentra-tion and triple-phase interface,providing abundant electroactive sites to achieve superior reaction rates.In this study,robust and self-supported Cu flow-through gas diffusion electrodes(FTGDEs)were synthesized for efficient formate production via electrochemical CO2 reduction.They were further compared with traditional Cu electrodes,and it was found that higher local CO2 concentration due to improved mass transfer,the abundant surface area available for the generation of the triple-phase interface,and the porous structure of Cu FTGDEs enabled high formate Faradaic efficiency(76％)and current density(265 mA·cm-2)at-0.9 V vs.reversible hydrogen electrode(RHE)in 0.5 mol·L-1 KHCO3.The combined phase inversion and calcination process of the Cu FTGDEs helped maintain a stable operation for several hours.The catalytic performance of the Cu FTGDEs was further investigated in a non-gas diffusion configuration to demonstrate the impact of local gas concentration on the activity and performance of electrochemical CO2 reduction.This study demonstrates the potential of flow-through gas-diffusion electrodes to enhance reaction kinetics for the highly efficient and selective reduction of CO2,offering promising applications in sustainable electrochemical processes.

外文关键词：

CO2 electroreductionflow-through deliveryhollow fiber structurelocal concentrationformate

作者：

Azeem Mustafa、Bachirou Guene Lougou、Yong Shuai、Zhijiang Wang、Haseeb-ur-Rehman、Samia Razzaq、Wei Wang、Ruming Pan、Jiupeng Zhao

展开 >

作者单位：

Key Laboratory of Aerospace Thermophysics of MIIT,Harbin Institute of Technology,Harbin 150001,China

School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China

Mechanical Engineering Department,University of Engineering and Technology,Taxila 47050,Pakistan

School of Aerospace,Mechanical and Mechatronics Engineering,University of Sydney,Sydney 2006,Australia

展开 >

基金：

National Key Research and Development Plan Project of China国家自然科学基金

项目编号：

2018YFA070230052227813

出版年：

2024

DOI：

10.1007/s11705-024-2392-6

化学科学与工程前沿