通过原子层沉积制备的MoS的结构方面,用于进化反应反应
Miika Mattinen1, Wei Chen2, Rebecca A Dawley3
1Department of Applied Physics and Science Education, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
概括
无形硫化物在电化学激活后对演化反应 (HER) 具有很高的活性. 量身定制的沉积方法为这些地球上丰富的催化剂提供了对结构-活性关系的见解.
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:
- 硫化 (MoS) 是地球上大量存在的用于演化反应 (HER) 的电催化剂.
- 晶体和无形形式的MoS都被研究用于HER在酸性介质中的应用.
- 了解结构-活性关系对于优化催化剂性能至关重要.
研究的目的:
- 通过使用等离子体增强原子层沉积,制备无形和晶体硫化的薄膜.
- 为HER.研究这些材料的结构和电化学特性.
- 阐明MoS电催化剂中的激活机制和结构属性相关性.
主要方法:
- 增强等离子体原子层沉积 (PEALD) 用于合成无形和晶体MoS薄膜.
- 电化学激活和表征 (超电位测量在10 mA/cm2在0.5 M H2SO4).
- 现场和准现场的X射线光电子光谱 (XPS) 用于结构分析.
主要成果:
- 无形MoS薄膜在电化学激活后转化为高度HER活性无形MoS2 (超电位210-250mV).
- 初始薄膜固化测量影响无形MoS的结构,HER活动和稳定性.
- 晶体MoS2催化剂在激活时没有结构变化,超电位在300-520mV之间.
结论:
- PEALD提供了一种实际的方法来储存定制的MoS HER电催化剂.
- 电化学激活显著增强无形MoS的HER活性.
- 催化剂结构,特别是晶体MoS2中的缺陷,在HER性能中起着至关重要的作用.
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