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对O₂和CO₂的定向静电效应

Daniel J Martin¹, James M Mayer¹

¹Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States.

Journal of the American Chemical Society

|July 22, 2021

概括

铁催化剂的四个独特的异构体有效地将化学能量转化为电力. 不同的异构体在氧气和二氧化碳还原反应中表现不同,这凸显了电荷密度的重要性.

科学领域:

电化学
催化剂
能源转换

背景情况:

下一代能源技术需要有效的化学转化为电能.
具有原子定位的静电动机的分子催化剂可以稳定带电中间体.
具有阴离子组的铁氨酸对氧气减少 (ORR) 和二氧化碳减少 (CO2RR) 有希望.

研究的目的:

为了研究金属胺单个胺的催化活性.
了解原子定位电荷在ORR和CO2RR中的作用.
确定静电环境对反应动力学和热力学的影响.

主要方法:

合成和分离一个铁的四个单独的体.
对每一个ORR和CO2RR的电化学评估.
对每个反应的转换频率和过量潜力的分析.

主要成果:

这四种体都有效地以快速的速度和低的超潜力催化ORR和CO2RR.
在异构体之间,最大的周转频率差异很大:ORR为60倍,CO2RR为5倍.
特定的异构体 (ORR的ααβ,CO2RR的ααα) 呈现出最高的活性和过度潜能.

结论:

原子定位的电荷在多步电化学转换中起着复杂的作用.
高电荷密度,而不是精确的方向,对于优化热力学和动力学至关重要.
这项研究为分子电催化中的静电控制提供了新的见解.

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