在高的LDH中激活格子氧,以实现强大而持久的水氧化
Fangqing Wang1,2, Peichao Zou3, Yangyang Zhang2
1Key Laboratory of Special Functional Materials for Ecological Environment and Information (Ministry of Education), Hebei University of Technology, Tianjin, 300130, PR China.
Nature communications
|September 27, 2023
概括
研究人员开发了一种新的高材料,用于水分裂. 这种先进的催化剂增强了氧气演变反应动力学和稳定性,克服了清洁能源生产的先前限制.
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:
- 氧化演化反应 (OER) 是水分裂的关键瓶,限制了整体效率.
- 传统的吸附物进化机制 (AEM) 有理论上的局限性.
- 在OER催化剂中实现高稳定性仍然是一个重大挑战.
研究的目的:
- 开发一种新的催化剂,通过触发晶格氧氧化机制 (LOM) 来增强OER动力学和稳定性.
- 研究OER的高材料中单原子装饰和氧空缺的协同效应.
主要方法:
- 合成一个高的MnFeCoNiCu层状双氧化物,装饰着Au单个原子和O空位 (AuSA-MnFeCoNiCu LDH).
- 电化学表征包括超电位和质量活动测量在1.0 M KOH.
- 在连续运行下进行长期稳定性测试.
- 先进的光谱技术和密度函数理论 (DFT) 计算.
主要成果:
- 在AuSA-MnFeCoNiCu LDH中,在10 mA cm-2时表现出213 mV的低超电位,在250 mV超电位时表现出732.925 A g-1的高质量活性.
- 催化剂表现出了显著的稳定性,在~100 mA cm-2下连续运行了700小时.
- DFT计算和光谱学证实,单个Au原子和O空缺之间的协同相互作用通过向上移动O2p波段并削弱金属-O键触发LOM.
结论:
- 开发的AuSA-MnFeCoNiCu LDH有效地触发了LOM,显著提高了OER动力学和稳定性.
- 单原子催化剂和氧气空缺之间的协同效应对于克服OER限制至关重要.
- 这项工作为设计用于高效水分的先进电催化剂提出了一个有希望的策略.
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