通过疏水性诱导的电动力学延迟促进CO2的电还原到多碳产品
Mengjiao Zhuansun1, Yue Liu2, Ruihu Lu3
1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, China.
Angewandte Chemie (International ed. in English)
|August 23, 2023
概括
疏水性离子体通过延长铜催化剂上的关键中间吸附来增强二氧化碳 (CO2) 的电化学减少. 这大大提高了生产有价值的多碳产品的效率.
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:
- 电化学二氧化碳减排 (CO2 RR) 对于可持续的化学生产至关重要.
- 铜 (Cu) 催化剂对二氧化碳RR有希望,但在多碳 (C2+) 产品的选择性和效率方面面临挑战.
- 水友表面限制了二氧化碳的可访问性和中间*CO停留时间,阻碍了C2+的形成.
研究的目的:
- 为了研究疏水性离子体对Cu催化CO2RR性能的影响.
- 了解水性如何影响反应动力学和*CO中间体的行为.
- 提高C2+产品生成的选择性和效率.
主要方法:
- 用四级基组功能化的多甲基离子体修改的Cu电极的制造. 四级基组功能化的多甲基离子体.
- 电化学表征包括循环电压测量和二氧化碳减排反应测量.
- 分析Tafel斜率和*CO覆盖面对电动力学探测潜力的敏感性.
主要成果:
- 强烈水的Cu电极显著延长了*CO在催化剂表面的停留时间.
- 这种电动减速是由增加的塔菲尔斜率和*CO覆盖面对电位的敏感性降低所证明的.
- 疏水性Cu电极在223 mA cm-2的高部分电流密度下实现了约90%的C2+法拉代效率,超过了裸体和疏水性Cu表面.
结论:
- 疏水性离子体可以通过调节中间吸附动力学来有效地提高CO2 RR中的C2 +选择性.
- 开发的疏水电极为高效的电化学二氧化碳转化提供了一个有希望的策略.
- 这项工作提出了一种非常规的电动控制方法,以提高催化剂性能.
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