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通过四面体-八面体阶段边界结构促进脊柱氧化物中的表面重建,以实现高效的氧气进化

Anqi Zou¹, Chao Wu^1,2, Qi Zhang³

¹College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China.

Angewandte Chemie (International ed. in English)

|July 25, 2024

概括

在晶格氧氧化机制 (LOM) 中的表面重建是不可逆转的化学反应,而不是电化学反应. 通过相位边界结构降低氧气空位形成能量可以提高催化剂的性能.

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
催化剂是一种催化剂.

背景情况:

表面重建是基于高效的晶格氧氧化机制 (LOM) 的关键.
传统的重建方法涉及电化学程序,如循环电压测量 (CV) 和线性扫描电压测量 (LSV).

研究的目的:

为了阐明基于LOM的CoFe0.25Al1.75O4催化剂表面重建的机制.
研究氧空位形成能量 (E-O-V) 在表面重建中的作用.
通过表面修改开发一种提高催化剂性能的策略.

主要方法:

研究了表面重建作为不可逆转的氧氧氧还原化学反应.
采用相位边界结构策略来降低CoFe0.25Al1.75O4.4中的E-O-V.
分析了Cooctahedral占用对重建的层形成和超电能的影响.

主要成果:

识别了表面重建作为不可逆转的氧氧氧化化学反应.
证明较低的E-O-V可以促进活性网状氧气与水的结合.
通过将共八面体占用率提高到64%,实现了3.5纳米厚的重建层,并减少了158mV的超电位.

结论:

在以LOM为基础的螺旋氧化物中进行表面重建是一种内在的化学过程.
阶段边界构造是调整E-O-V和增强催化活性的有效策略.
来自四面体-八面体相位共存的格子不匹配促进了非结合氧气状态,降低了E-O-V,并增强了重建.

关键词:

氧气的演变氧气的演变阶段边界建设阶段边界建设.脊柱氧化物脊柱氧化物表面重建的重建.

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