CO2 的切换反应路径 CO2 的电还原通过调节电离子在电化学双层中的电解
Jiahao Yang1,2, Jiapeng Jiao3, Shiqiang Liu1
1Beijing National Laboratory for Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Center for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Angewandte Chemie (International ed. in English)
|July 9, 2024
概括
电解质控制二氧化碳电还原反应 (CO2RR) 的选择性. 离子液态酸盐抑制的演变,通过调节性金属酸盐,使高产量的CO或酸盐成为可能.
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:
- 仅使用电解质变化控制二氧化碳电还原反应 (CO2RR) 的选择性是非常理想的.
- 大量金属电极通常用于CO2RR,但实现特定产品的选择性仍然具有挑战性.
研究的目的:
- 为了研究不同水性电解质对CO2RR选择性对散装金属电极的影响.
- 为了证明电化学双层中的调制子可以调整CO2RR产品分布.
主要方法:
- 在铜电极上使用各种水性电解质与不同子进行了CO2RR实验.
- 使用现场光谱和理论计算来理解反应机制和界面现象.
- 在电解质中多种各样的金属酸 (例如,K+,Cs+) 和引入的离子液体酸 (Omim+).
主要成果:
- 通过改变电解质成分来实现选择性生产CO或酸盐.
- 通过将电解质从KBr-OmimBr转换为CsBr-OmimBr,证明了从CO (97.3%FE_CO) 转换为形成 (93.5%FE_形式) 的方法.
- 在有离子液的存在下观察到显著抑制演化反应 (HER).
结论:
- 电解质,特别是离子液体,可以通过抑制HER有效调整CO2RR选择性.
- 在负电位下Omim+的组合改变了水界结构,抑制了HER.
- 选择性的差异源于阴离子诱导的键效应,影响金属阴离子溶解和中间稳定.
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