脉冲策略强化SnOx电极长效还原CO2制甲酸机理研究
Mechanism of Long-term Reduction of CO2 to Formic Acid on SnOx Electrode Enhanced by Pulse Strategy
蒋浩 1朱德圣 2闫喜凤 1于洋茜 2郑飞 2赵黎明 2杨金明 2刘妍 3罗仙平1
作者信息
- 1. 东华理工大学核资源与环境国家重点实验室,江西南昌 330013;东华理工大学水资源与环境工程学院,江西南昌 330013
- 2. 东华理工大学水资源与环境工程学院,江西南昌 330013
- 3. 东华理工大学核资源与环境国家重点实验室,江西南昌 330013
- 折叠
摘要
SnOx是电催化还原二氧化碳制甲酸的高效活性催化剂,然而,在传统恒电位还原CO2过程中会被还原成低价金属氧化物或零价金属,导致活性降低甚至失活.脉冲电催化技术可以动态调控电极表面活性物质,且操作简单,可利用脉冲策略来强化SnOx催化剂的稳定性.实验结果表明,脉冲电位条件下,SnOx电极在电解12 h后仍保持良好的稳定性,制甲酸法拉第效率维持在40％左右,比恒电位条件下高153％.结合物化表征与电化学测试结果可知,SnOx催化稳定性归因于脉冲氧化电位促使电极表面SnOx原位动态再生,并促进活性组分分散.研究成果为提高金属氧化物电极电催化还原CO2制甲酸的稳定性提供了一种新的技术思路.
Abstract
SnOx is an efficient and active catalyst for the electrochemical reduction of carbon dioxide to produce formate.However,under traditional constant-potential CO2 reduction,SnOx tends to be reduced to lower-valent metal oxides or elemental metals,leading to decreased activity or even deactivation.The pulsed electrocatalysis technique enables dynamic regulation of active species on the electrode surface and it is easy to operate.There-fore,a pulsed strategy to enhance the catalyst stability of SnOx is used in the study.Experimental results indicate that under pulsed potential conditions,the SnOx electrode maintains good stability after 12 hours of electrolysis,with a Faradaic efficiency for formate production of approximately 40％,an improvement of 153％compared to constant-potential conditions.Based on physicochemical characterization and electrochemical testing,the outstand-ing catalytic stability is attributed to the pulsed oxidation potential,which promotes dynamic in-situ regeneration of SnOx on the electrode surface and facilitates the dispersion of active components.The research results provide a no-vel technical approach to enhance the stability of metal oxide electrodes for electrocatalytic CO2 reduction to for-mate.
关键词
二氧化碳/还原/锡氧化物/脉冲电催化Key words
carbon dioxide/reduction/SnOx/pulsed electrochemistry引用本文复制引用
出版年
2024
NETL
NSTL
万方数据