溶剂对电化学CO2的作用 纳米结构铜电极上的还原反应
Connor Deacon-Price1, Alisson H M da Silva2, Cássia S Santana1
1Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
概括
通过电化学方法将二氧化碳 (CO2) 减少为碳化合物是一项挑战. 这项研究表明,纳米结构的铜电极在酸中与水一起可以产生乙烯,但水可以产生乙烯.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 可持续化学 可持续化学
背景情况:
- 电化学减少二氧化碳 (CO2RR) 为燃料和化学品提供了一个可持续的途径.
- 通过CO2RR生产碳化合物面临着诸如高超电位和竞争性演化反应 (HER) 等挑战.
- 电解质成分是指导CO2RR对HER的选择性的一个关键因素.
研究的目的:
- 通过使用纳米结构铜电极,研究溶剂效应,特别是酸中的水度,对CO2RR的影响.
- 了解水和电极表面结构在CO2RR选择性和活性中的作用.
- 为了阐明反应机制和介质物种涉及到CO2RR在乙尼基电解质.
主要方法:
- 使用纳米结构铜 (CuNC) 和多晶铜 (Cu) 电极的电化学减少二氧化碳.
- 在线气相色谱用于产品分析 (法拉第效率).
- 在现场的里埃变换红外光谱 (FTIR) 用于研究界面物种和反应机制.
主要成果:
- CO2RR是结构依赖的,CuNC电极在>500 mM水度下产生乙烯 (10% FE).
- 在乙二中,CO是主要产物 (>85% FE),吸附的CO未被检测到,这表明吸附受阻.
- 将水添加到酸对CO2RR活性和选择性的影响很小,这表明它对确定速率的步骤并不至关重要.
结论:
- 纳米结构的铜电极显示出在乙尼-水混合物中具有选择性CO2RR的潜力.
- 电极结构和电解质组成显著影响CO2RR通路.
- 需要进一步的研究来增强碳化合物生产,并了解非水性电解质的基本机制.
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