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基于亚纳米IR的合金集群通过对水分化的层次封闭效应来分离水

Xuemin Cao¹, Han Cheng¹, Renjie Gui¹

¹Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, P.R. China.

Angewandte Chemie (International ed. in English)

|July 8, 2025

概括

研究人员开发了一种分层封闭策略,以创建统一的亚纳米尺度合金催化剂. 这些新型催化剂在氧气演化反应中表现出卓越的性能,显著超过商业化氧化的性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
纳米技术纳米技术

背景情况:

精确合成亚纳米级贵金属催化剂对于先进的电催化非常重要.
在亚纳米尺度上控制颗粒大小是具有挑战性的,因为在高温下烧结.

研究的目的:

开发一个层次的限制策略,用于合成均大小的亚纳米级贵金属催化剂.
研究这些新型催化剂的电催化性能,特别是在氧化演化反应 (OER) 中.

主要方法:

层次的限制策略结合了空间和定限制.
制造以为基础的亚纳米级合金集群 (IrMn,IrFe,IrCo,IrNi).
对OER和计算模拟 (DFT,MD) 的电催化测试.

主要成果:

一致大小 (∼1 nm) 的亚纳米级基于Ir的合金集群已成功合成.
亚纳米级的IrCo合金集群表现出异常的OER活性,具有超低的超电位 (210 mV在10 mA cm−2) 和高质量活性.
DFT和MD模拟表明,的结合增强了Ir-支持相互作用.

结论:

层次封闭策略有效地防止了烧结,并允许精确控制亚纳米级催化剂的尺寸.
亚纳米级的IrCo合金集群代表了高效的贵金属催化剂,用于氧气演化反应.
这种方法为开发具有高原子利用率的高性能催化剂开辟了新的途径.

关键词:

电催化剂是一种电催化剂.层次上的封闭限制等级的封闭.氧的演化反应反应的反应.基于亚纳米Ir的合金集群.

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