电化学CO2减少铜泡中的散装和表面氧化物演变的动力学
Fan Yang1, Shan Jiang1, Si Liu1
1Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, 14195, Germany.
Communications chemistry
|March 29, 2024
概括
氧化物衍生的铜催化剂对电化学二氧化碳减排具有很高的活性. 在减排过程中被捕获的大量氧化物种增强了对有价值的C2+产品的选择性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧化物衍生铜 (OD-Cu) 材料在电化学二氧化碳还原反应 (CO2RR) 中表现出显著的催化活性.
- 催化性能与氧化-减氧过渡过程中形成的非金属成分有关.
- 了解动态结构变化对于优化CO2RR至关重要.
研究的目的:
- 调查CO2RR期间OD-Cu中氧化铜减少和再形成的结构动态.
- 区分表面和散装 (表面下) 材料的变化.
- 为了将结构动力学与催化性能和产品选择性相关联.
主要方法:
- 时间分辨率操作的X射线吸收光谱 (XAS) 探测大量结构变化.
- 表面增强拉曼光谱 (SERS) 用于监测表面物种.
- 电化学还原和氧化循环.
主要成果:
- 表面物种的变化发生在几秒钟内,而大量的过程需要几分钟.
- 观察到地下氧化物物种的动力捕获,特别是在氧化和还原潜力之间的循环中.
- 检测到表面吸附的酸 (*OH) 和含碳物种,以及大量的氧化物种.
结论:
- 在OD-Cu中大量氧化物种的形成和动力捕获在CO2RR中起着关键作用.
- 优化的还氧化协议可以通过控制大量氧化物形成来增强催化性能.
- 大量氧化物物种和表面中间体 (*OH,C物种) 的协同作用促进了CO吸附,并提高了对C2+产品的选择性.
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