带有体中心立方核的Ag15Cu6纳米集群与基尼尔保护:合成,总结构和CO2电减
Guocheng Deng1,2, Jimin Kim1,3, Megalamane S Bootharaju1,2
1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.
Journal of the American Chemical Society
|December 21, 2022
概括
研究人员合成了一种新的21原子银铜 (AgCu) 合金纳米集群,用于电化学二氧化碳的减少. 这种AgCu纳米集群表现出极高的催化活性和稳定性,可将二氧化碳转化为有价值的产品.
科学领域:
- 纳米材料科学
- 催化剂
- 电化学
背景情况:
- 原子精确的纳米结构材料对于理解结构-催化关系至关重要,但难以合成和表征.
- 基于铜的合金纳米集群是电化学二氧化碳减排 (eCO2RR) 的有希望的催化剂,因为铜的丰富性和调节性.
研究的目的:
- 合成并确定一种新型基合金纳米集群的原子层结构.
- 评估合成纳米聚合物的电化学二氧化碳还原反应 (eCO2RR) 的催化性能.
主要方法:
- 合成一种由基保护的21原子AgCu合金纳米集群,[Ag15Cu6(CCR) 18 ((DPPE) 2−.
- 单晶X射线衍射用于原子层结构的确定.
- 对eCO2RR的催化活性和稳定性的电化学评估.
- 用密度函数理论 (DFT) 计算来研究催化机制.
主要成果:
- 合成的纳米集群,标记为Ag,具有Ag11Cu4核心与体中心立方体 (bcc) 结构,由额外的原子和连接体限制.
- Ag纳米集群对eCO2RR具有很高的催化活性,在 - 0. 81V与RHE相比,其碳化合物效率 (FE_CO) 为91. 3%.
- 催化剂表现出卓越的稳定性,在145小时的运行中保持性能.
- DFT 的计算表明,脱的 AgCu 双金属位点是有效的 CO 形成位点.
结论:
- 该研究成功合成并描述了一种具有定义原子结构的新型AgCu合金纳米集群.
- Ag纳米集群显示出作为有效和稳定的电化学二氧化碳降解的催化剂的巨大潜力.
- 这些发现为 CO2 转化先进催化剂的设计提供了洞察力.
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