在电催化CO2降解成甲醇中,甲酸的活性部位
Conor L Rooney1,2, Mason Lyons3, Yueshen Wu1,2
1Department of Chemistry, Yale University, New Haven, CT, 06520, USA.
Angewandte Chemie (International ed. in English)
|October 11, 2023
概括
碳纳米管上的硫酸是电降低二氧化碳 (CO2) 到甲醇的唯一催化剂. 这项研究揭示了其结构-活性关系和反应机制,使用现场X射线吸收光谱学.
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
- 催化剂是一种催化剂.
背景情况:
- 金属协调化合物正在研究二氧化碳的电还原到二氧化碳.
- 与碳纳米管 (CNT) 混合的甲 (CoPc) 是二氧化碳电还原到甲醇的独特方法.
- 结构-活性相关性和CoPc催化甲醇生产的机制仍然不清楚.
研究的目的:
- 阐明CoPc催化二氧化碳电还原到甲醇的结构-活性相关性和反应机制.
- 研究CoPc在CNT上的分子分散的作用.
- 确定甲醇生产活动地点的关键结构部件.
主要方法:
- 在现场的X射线吸收光谱 (XAS) 用于实时表征.
- 现场光谱和电催化测量.
- 与结构相关的氨酸相比较.
主要成果:
- 对于有效的电子转移和多电子二氧化碳减少,CNT上的CoPc的分子分散是至关重要的.
- 介质CO是不稳定的,需要高的局部度用于甲醇生产.
- 在CoPc宏循环中,桥接aza-N原子对于活性位点至关重要.
- 在现场,XAS确定了活跃地点为Co ((I)) 具有不断变化的协调环境,暗示了Co-CO adduct形成.
结论:
- 这项研究为COPc催化CO2电还原到甲醇的机制提供了关键的见解.
- 优化的CoPc-CNT杂交和了解CO中间体的作用是提高甲醇生产的关键.
- 这些发现凸显了酸宏循环结构对于选择性甲醇合成的重要性.
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