通过振动总频生成光谱学揭示的电极-催化剂相互作用在使高效的CO2减少中的作用
Gaia Neri1, Paul M Donaldson2, Alexander J Cowan1
1Department of Chemistry and Stephenson Institute for Renewable Energy, University of Liverpool , L69 7ZD Liverpool, United Kingdom.
Journal of the American Chemical Society
|September 13, 2017
概括
六组金属碳化合物显示出减少二氧化碳的潜力. 优化电极与复合物的相互作用显著降低了有效催化所需的潜力.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 作为二氧化碳 (CO2) 减少的电催化剂,研究了6组金属碳化合物,特别是[M(bpy) ((CO) ] (M=Cr,Mo,W).
- 一个显著的限制是它们的高启动潜力,需要非常负的催化活性,这也取决于电极.
研究的目的:
- 使用现场振动SFG (VSFG) 光谱,研究[Mo(bpy) ((CO) 4的电催化二氧化碳减排机制.
- 了解电极材料在影响催化活性和发作潜力的作用.
主要方法:
- 使用现场振动总频谱 (VSFG).
- 使用和金电极进行了实验,以研究[Mo(bpy) ((CO) 4的行为.
- 进行了电化学测量以确定发病潜力和催化活性.
主要成果:
- 与相比,黄金电极的二氧化碳减排开始潜力大大提高.
- 黄金的增强活性归因于通过更有利的途径在较少的负潜力形成活性物种[Mo(bpy) ((CO) 3-2].
- VSFG研究表明,介质[Mo(bpy) ((CO) 4•-与电极表面之间的相互作用强度对于低能耗通向活性催化剂的途径至关重要.
结论:
- 电极材料在6组金属碳化合物的电催化二氧化碳减排效率中起着至关重要的作用.
- 了解和控制电极-催化剂的相互作用可以导致更积极和更有效的二氧化碳减排电催化剂的开发.
- 进一步优化电极材料,溶剂和电解盐可以使6组复合物与7组类似物相匹配.
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