通过脉冲诱导的离子缩来定制CO2的电减
Jianghao Wang1,2, Yanyang Qin3, Shoutong Jin1
1School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Journal of the American Chemical Society
|November 9, 2023
概括
通过脉冲电解进行阳离子丰富,控制铜催化二氧化碳电还原 (CO2RR). 这一策略通过改变电解质组成来调整产品对CO,C2+产品或甲的选择性.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 通过电化学方法将二氧化碳 (CO2) 转化为有价值产品对于碳中和经济至关重要.
- 使用铜基催化剂控制二氧化碳的产品分布仍然是一个重大挑战.
- 调节催化剂的选择性是有效利用二氧化碳的关键.
研究的目的:
- 为控制二氧化碳电还原产品的选择性制定一个离子缩策略.
- 研究脉冲电解和电解质组成对二氧化碳电还原通路的影响.
- 了解缩离子影响二氧化碳减排中间体的机制.
主要方法:
- 用于商业铜电极的脉冲电解策略.
- 系统地改变电解质组成 (KF,KCl,KHCO3),以实现离子丰富.
- 产品分析以确定对CO,C2+产品和甲 (CH4) 的选择性.
- 密度函数理论 (DFT) 的计算以阐明反应机制.
主要成果:
- 用离子丰富的脉冲电解成功调节了二氧化碳的电解产品.
- 特定电解质对CO (53%±2.5%与KF),C2+ (76.6±2.1%与KCl) 和CH4 (42.6±2.1%与KHCO3) 具有很高的选择性.
- 通过电解质修改,可以精确控制CO/CH4,CH4/C2+和C2+/CO的比率.
- DFT计算证实了离子特性 (电子负性,体积) 影响关键中间体和选择性.
结论:
- 阳离子丰富是一种有效的策略,用于控制铜催化剂上的二氧化碳电还原产品分布.
- 脉冲电解提供了一种用于定制催化剂的界面离子环境的方法.
- 这种方法通过调整电解质成分来定制二氧化碳电解产品.
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