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内在铁电相位过渡对的作用 进化电催化 电催化
Fengmei Wang1,2, Lin Ju3, Binglan Wu2
1State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Angewandte Chemie (International ed. in English)
|February 26, 2024
概括
这项研究揭示了铁电相变如何影响电催化. 在CuInP2S6中的铁电催化效应影响了进化反应动力学和热力学.
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
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 不同质的电催化依赖于材料的电子结构.
- 铁电到电相位过渡改变电子状态,可能影响电催化活性.
- 铁电和电催化之间的相关性在很大程度上仍未被探索.
研究的目的:
- 调查铁电到电相位过渡对内在电催化活性的影响.
- 用二维铁电CuInP2S6.6来探索演化反应 (HER) 上的铁电催化效应.
- 了解如何通过相变修改电子结构影响催化热力学和动力学.
主要方法:
- 在CuInP2S6.6.上对进化反应催化物的实验研究.
- 理论计算以阐明底层机制.
- 在相位过渡过程中分析过电势和明显的激活能量变化.
- 在CuInP2S6的铁电和电相上具有Pt单原子负荷的催化活性的表征.
主要成果:
- 对CuInP2S6在318K的铁电到电相位过渡过程中观察到超电位和明显激活能的不连续性.
- 证明了一种影响 HER 热力学和动力学的铁电催化效应.
- 与铁电相相比,Pt单原子负载的CuInP2S6在平电相中表现出增强的HER活性,明显的激活能量较低.
结论:
- 铁电到电相位过渡显著调节了内在的电催化活动.
- 在CuInP2S6中,铜在硫平面之间跳跃导致在Pt位点交替强和弱的H吸附,优化HER.
- 这项工作通过利用铁电相变来设计先进的电催化剂的新策略.
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