网格失调的高合金通过热脱氧工程改进,以改善催化演化反应
Kang Huang1,2, Xun Cao3, Yu Lu3
1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
Advanced materials (Deerfield Beach, Fla.)
|June 5, 2024
概括
研究人员使用制造了一种无序的----铁- (PtIrNiCoFeZn) 高合金 (HEA). 这种混乱的HEA表现出显著增强的电催化演化反应 (HER) 活性和性溶液中的稳定性.
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:
- 失序的晶体结构,以空位或格子错误排列为特征,增强了电催化演化反应 (HER).
- 高合金 (HEAs) 为包括催化在内的先进应用提供可调节的性能.
研究的目的:
- 为了合成一种具有高度混乱的格子结构的老年PtIrNiCoFeZn HEA.
- 为了研究晶格障碍对性介质中的HER性能的影响.
- 引入一种用于描述无序格子的新方法.
主要方法:
- 由于其低蒸发温度,Senary PtIrNiCoFeZn HEA合成利用作为牺牲成分.
- 在传输电子显微镜 (TEM) 中使用热扩散散射 (TDS) 进行晶格障碍的表征.
- 密度函数理论 (DFT) 的计算,以阐明在HER上的晶格障碍机制.
- 对性HER活性和稳定性的实验测量.
主要成果:
- PtIrNiCoFeZn HEA 呈现出高度混乱的格子结构,由TDS证实.
- DFT的计算表明,格子障碍加速了HER中的Volmer和Tafel步骤,并优化了Fermi能量附近的电子结构.
- 实验结果表明异常高的性HER活性和异常高的性HEA的良好稳定性.
结论:
- 通过使用牺牲成分开发了一种新的方法来制备格子无序的HEAs.
- 该研究提供了一种TDS表征方法,用于揭示无序格子.
- 这项工作为 HER 设计和开发具有不对称无序格子的高效电催化剂开辟了新的途径.
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