表面的桥梁位置对电催化CO2的减少是活跃的
Zixu Tao1,2, Adam J Pearce1, James M Mayer1
1Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
Journal of the American Chemical Society
|May 4, 2022
概括
在电化学二氧化碳减排过程中重组黄金表面,为二氧化碳吸附创造桥梁位置. 这些具有桥接的二氧化碳物种是活性中间体,其中多达38%的反应发生在这些地点.
科学领域:
- 电化学
- 表面科学
- 光谱学
背景情况:
- 黄金 (Au) 是一种高选择性的电催化剂,用于将二氧化碳减少为二氧化碳.
- 之前的研究表明,二氧化碳的减少仅发生在Au表面的顶部.
- 需要改善现场光谱电化学系统,以在现实条件下研究反应.
研究的目的:
- 在Au的电化学CO2减排过程中研究桥接CO物种 (*COB) 的作用.
- 开发一种涂有 Au 的 Si ATR 晶体电极,用于现场增强的红外测量.
- 在反应条件下探测*COB的吸附和脱吸行为.
主要方法:
- 用AU涂层的Si ATR晶体电极的制备
- 现场光谱电化学测量,使用减弱的全反射率里埃变换红外光谱 (ATR-FTIR).
- 对*COB的潜在依赖性脱吸动力学和表面度的分析.
主要成果:
- 在几秒钟内增加了CO吸附的桥梁位.
- *COB物种被确定为减少二氧化碳的活性中间体.
- 到38%的反应发生在中等超电位的桥梁站点.
结论:
- 在AU的电化学二氧化碳减少涉及重组桥梁站点上的活性*COB中间体.
- 这项研究更新了对AU电催化剂反应机制的理解.
- 开发的光谱电化学系统可以在反应条件下进行详细的机械研究.
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