动态稳定Cu0Cuδ+ 基于在CaCO3上的In Situ溶解Cu纳米集群的对位点,以实现高效的CO2电还原
Rongrong Zhang1,2, Haibin Ma1, Shuhe Han3
1Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
Angewandte Chemie (International ed. in English)
|January 8, 2025
概括
这项研究引入了一种新方法,用于创建稳定的铜催化剂,用于将二氧化碳转化为有价值的多碳产品. 增强的催化剂设计提高了二氧化碳电还原 (CO2RR) 的效率.
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:
- 铜催化剂对于通过二氧化碳电还原 (CO2RR) 合成多碳 (C2+) 产品至关重要.
- 协同作用的Cu0/Cuδ+对位点是C-C合的关键,但它们的动态稳定性很难维持.
- 对于稳定的催化剂性能,需要精确控制电子亲和力和离子空位形成能量.
研究的目的:
- 制定一个战略,为高效的CO2RR创造动态稳定的Cu0/Cuδ+对位点.
- 研究介面图案和离子配对在催化剂稳定性和性能中的作用.
- 加强从二氧化碳电还原中生产多碳产品的生产.
主要方法:
- 在Cu/CaCO3接口上形成Cu0Cu0.18+OCa图案的现场重建策略.
- 在现场进行X射线吸收细结构 (XAFS) 分析以确认Cuδ+低价值状态.
- 密度函数理论 (DFT) 计算,以了解纳米集群大小,界面稳定性和能量障碍.
主要成果:
- 在393 mA cm-2.2的部分电流密度下,达到83.7%的令人印象深刻的C2 + 法拉代效率.
- 已证明具有动态稳定的Cu0/Cuδ+对位点,归因于低电子亲和度和高CO32-空位形成能量.
- 确定不溶性碳酸盐是稳定Cu0/Cuδ+位点的有效离子配对.
结论:
- 在现场的复制策略有效地产生了高密度的动态稳定的Cu0/Cuδ+对位点.
- /CO3催化剂在二氧化碳电还原到C2+产品方面表现出卓越的性能.
- 这项工作为设计稳定的基于铜的催化剂提供了洞察力,用于二氧化碳转化.
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