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调节吸附驱动电化学CO2到C2产品

Jiaqi Feng¹, Libing Zhang^1,2, Shoujie Liu³

¹Beijing National Laboratory for Molecular Sciences, Key Laboratory of Colloid and Interface and Thermodynamics, Center for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Nature communications

|August 1, 2023

概括

这项研究引入了一种新的双活性位点催化剂,用于电催化二氧化碳的减少. 催化剂通过优化水解离和C-C合步骤来增强多碳产品合成,实现高效率.

科学领域:

电化学电化学电化学
催化剂是一种催化剂.
材料科学材料科学材料科学

背景情况:

电催化二氧化碳的减少对可持续化学至关重要.
水分离在减少二氧化碳中的作用往往被低估.
为多碳产品开发高效的催化剂是一个关键的挑战.

研究的目的:

设计和研究一个双活性站点催化剂,以提高电催化二氧化碳的减少.
为了阐明原子Cu位点和Cu纳米粒子之间的协同效应.
提高对多碳产品的选择性和效率.

主要方法:

制造具有原子Cu位点和Cu纳米颗粒的催化剂在N-化碳基质上.
电化学性能评估,包括法拉第效率和部分电流密度.
计算研究 (例如,DFT) 以了解反应机制.

主要成果:

在289.2mA cm-2.2的部分电流密度下,在多碳产品中实现了高法拉代克效率 (~75.4%).
证明原子Cu位点增强H2O解离,而Cu纳米粒子促进C-C合 (*CHO二元化).
揭示了在原子位点产生的*H物种迁移并调节Cu纳米粒子活动,促进*CO-to-*CHO转化.

结论:

双活性位点催化剂有效地整合了原子Cu和Cu纳米粒子,以实现更优质的二氧化碳电还原.
单个原子位点和纳米粒子之间的协同作用是克服反应瓶的关键.
这种方法为高效的二氧化碳高价值多碳化学物质的电合成提供了一个有希望的策略.

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