氧缺陷工程促进了吸附物演变和OER在过渡金属基 (氧) 氧化物中的单晶格氧机制之间的协同作用
Yu-Han Wang1, Lei Li1, Jinghui Shi1
1Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 9, 2023
概括
这项研究引入了一种新的方法,通过在NiFe层双氧化物 (NiFe-LDH) /FeOOH中创建氧缺陷来增强氧进化反应 (OER) 催化剂. 这种缺陷工程最大限度地提高了有效能源应用的活跃地点.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 过渡金属 (氧) 氧化物中的氧化演化反应 (OER) 活性受到表面活性位点的数量和性质的限制.
- 大多数表面位是不活性氧原子,活性位是过渡金属原子,占地面积不到一半.
研究的目的:
- 开发一种简单的一步方法,以调节NiFe层双氧化物 (NiFe-LDH) /FeOOH异构结构中的氧气缺陷.
- 调查氧气缺陷对OER机制和催化活性的影响.
主要方法:
- 采用了使用双金属离子和氧化离子的现场竞争式增长战略.
- 通过改变H2O2的添加来调节氧缺陷,同时调节缺陷度,金属价值和组件比率.
主要成果:
- 最优的NiFe-LDH/FeOOH异构表现出增强的OER电催化活性.
- 在电流密度为 20 mA cm-2 的情况下,可以达到 177 mV 的过电位,具有很高的稳定性.
- 适当的氧缺陷促进了吸附物演化机制 (AEM) 和单晶网氧机制 (sLOM) 之间的协同作用.
结论:
- 这种新的战略有效地设计了基于高活性过渡金属LDH的OER电催化剂.
- 这种方法最大限度地利用表面过渡金属和氧原子作为活性位点.
- 开发的催化剂显示出对能源和环境应用的希望.
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