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通过MnO₂的道大小优化Ru催化剂-支持相互作用支持增强的酸性水氧化

Sixuan She¹, Changsheng Chen¹, Ke Fan¹

¹Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

Journal of the American Chemical Society

|July 3, 2025

概括

通过控制MnO2道大小来调整金属支相互作用 (MSI),优化氧演化反应 (OER) 的催化剂. 这通过加强Ru-O债券来增强活动和稳定性.

科学领域:

不同质的催化
材料科学
电化学

背景情况:

金属支相互作用 (MSI) 极大地影响了催化剂性能.
优化MSI是高活性和稳定的催化剂的关键.
基于 (Ru) 的催化剂在酸氧演化反应 (OER) 中面临挑战,原因是缓慢的动力学和Ru的不稳定性.

研究的目的:

通过控制 MnO2 支道大小来调整 MSI 的强度.
提高OER的Ru基催化剂的活性和稳定性.
调查MnO2道大小,MSI和OER性能之间的关系.

主要方法:

MnO2多态的晶体工程 (α-MnO2到β-MnO2).
在不同的道尺寸的MnO2支上加入Ru.
MSI强度和OER催化性能的表征
对Ru-O-Mn结合和电子相互作用的分析.

主要成果:

减少MnO2道大小最初会增加平面氧度,并加强Ru-Opla-Mn键.
过小的道尺寸导致无形化和MSI减弱.
在MSI强度,OER活动和MnO2道大小之间存在火山形的关系.
优化的Ru-γ-MnO2表现出强大的MSI,达到高质量活性 (1.5V的1743Ag-1) 和稳定性.

结论:

通过中间MnO2道大小促进的强Ru-Opla-Mn相互作用,增强了OER动力学和稳定性.
这些相互作用通过Ru-O协同作用促进OOH*中间体的形成.
双交换电荷转移从Mn稳定了Ru物种的溶解.
支持的结构设计为优化异质催化剂的MSI提供了可行的策略.

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