对于铁氧化物,元素特异性扭曲和电催化氧演变之间的相互作用
Elif Pınar Alsaç1, Marlyn Boke1, Justine R Bissonnette1
1Department of Chemistry, University of Waterloo, 200 University Avenue W. Waterloo Ontario N2L 3G1 Canada rodsmith@uwaterloo.ca.
Chemical science
|September 5, 2024
概括
在氧化 (Co(OH) 2) 中对铁进行注,可增强氧化演化催化. 微观结构的扭曲,而不仅仅是组成,决定了性能,揭示了对于催化剂设计至关重要的制造依赖的效应.
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:
- 了解对氧演化反应 (OER) 催化过程中的Co(OH) 2的影响至关重要.
- 现有的知识缺乏对Fe的纳入如何影响开放式资源表现的微观见解.
研究的目的:
- 阐明Fe-doping,微观结构和Co(OH) 2.2.中的电催化活性之间的关系.
- 确定与OER性能相关的关键结构描述符.
主要方法:
- 合成了两个具有不同制造协议的Co1-xFex(OH) 2系列.
- 使用X射线衍射 (XRD),X射线吸收光谱学 (XAS) 和拉曼光谱学进行了表征.
- 结构参数与电催化OER性能之间的相关性分析.
主要成果:
- 催化剂的性能与仅仅成分的相关性很差.
- 在Co1-xFex(OH) 2中观察到元素特定的扭曲,取决于制造.
- 铁-O 债券抵御了扭曲,导致 Co 环境和 O-M-O 债券角度发生变化.
- 与OER活动相关的OMO结合角度差异,表明扭曲的潜在能量表面.
- 减小的O-Co-O角表示在速度限制步骤中的过渡.
结论:
- 制造协议对化化的微观结构和电子结构产生重大影响.
- 微观结构的扭曲,特别是OMO债券角度,是开放式能源效率的关键决定因素.
- 未来的理论和高通量研究必须考虑电催化剂设计中的制造依赖效应.
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