通过价值和协调环境调制来提高电化学CO2减少基于铜的金属有机框架
Jun Deng1, Limei Qiu1, Mudi Xin1
1Sinopec Research Institute of Petroleum Processing, Beijing, 100083, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 30, 2024
概括
研究人员增强了基于铜的金属有机框架 (MOFs),用于电催化二氧化碳 (CO2) 减少到乙烯. 修改铜的方法
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 基于铜的金属有机框架 (MOFs) 显示出电催化 CO2 减少的前景.
- 现有的基于Cu的MOF通常表现出低选择性和不稳定性,用于将CO2转化为有价值的化学物质.
- 优化金属节点的价值和协调环境对于提高催化性能至关重要.
研究的目的:
- 开发一种基于的MOF,具有增强的选择性和稳定性,用于电催化二氧化碳减少到乙烯.
- 研究铜价值状态和协调环境对二氧化碳电还原通路的影响.
- 为高度选择性的电催化二氧化碳减排催化剂制定设计策略.
主要方法:
- 使用一种新的"减少-裂变-再结晶"方法,从Cu(I) -BTC中合成Cu(II) -BTC的MOF.
- 合成的Cu(I) -BTC MOFs的特征是为了分析它们的结构和组成.
- 使用修改的MOF进行了电催化CO2减排,并测量了乙烯选择性和法拉第效率.
主要成果:
- 与Cu(I) -BTC.MOF相比,Cu(I) -BTC MOF的催化活性和乙烯选择性显著提高 (约2.2倍) 与Cu(II) -BTC.MOF相比.
- 在二次协调环境中增加自由碳酸基的度进一步提高了乙烯的选择性.
- 优化的催化剂达到高乙烯法拉第效率高达57%,并表现出38小时的优异耐用性.
结论:
- 在MOF中铜节点的价值状态和协调环境强烈影响CO2电还原性能.
- I) -O协调和自由的碳酸基之间的协同效应通过增强CO中间体二元化和抑制化来促进乙烯的产生.
- 这项研究为设计用于选择性电催化二氧化碳转换的先进MOF催化剂提供了一个可行的平台.
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