耐氧CO2电还原对共价有机框架通过光交换控制氧气被动化策略
Hong-Jing Zhu1,2,3, Duan-Hui Si1,2,3, Hui Guo1,2,3
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002, Fuzhou, PR China.
Nature communications
|February 17, 2024
概括
这项研究引入了一种新材料,用于高效的二氧化碳 (CO2) 电催化,即使存在氧气. 这种氧气被动化策略使得使用烟气等实际来源实现二氧化碳的转化.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
背景情况:
- 使用烟气直接的电化学CO2减排受到氧气的竞争反应的阻碍.
- 开发高效的电催化剂,用于在有氧环境中转化二氧化碳,对于碳捕获和利用至关重要.
研究的目的:
- 设计一种基于甲的共价有机框架 (COF),与可光切换单元集成,用于高效的二氧化碳电催化.
- 以烟气应用为灵感,展示在氧气存在时用于CO2电减的氧气被动化策略.
主要方法:
- 将可光切换的1,2-Bis(5'-formyl-2'-methylthien-3'-yl) cyclopentene (DAE) 单元集成到基于色素的COF中.
- 通过DAE部分的UV/Vis诱导的环闭/开反应来调节O2激活和电子导电.
- 在CO2和O2的同时养条件下的电化学CO2减排实验.
主要成果:
- 基于DAE的环闭COF表现出高的CO法拉代效率 (90.5%) 和CO部分电流密度为-20.1 mA cm-2在-1.0V与RHE.
- 该材料在UV/Vis光下证明了O2激活和导电性的可逆调制.
- 即使在5%的O2联合养的情况下,也可以成功实现CO2电减,展示了有效的氧气被动化策略.
结论:
- 开发的基于DAE的COF提供了一种有效的氧气被动化策略,在有氧环境中实现高效的CO2电减.
- 这种方法对利用烟气和空气等实际二氧化碳来源充满希望.
- 这些发现激发了先进的电催化剂的设计,用于从混合气体流中直接转化二氧化碳.
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