55原子PtNi纳米集群的进化描述符和与石墨的相互作用
Olli Ahlstedt1, Jaakko Akola1,2
1Computational Physics Laboratory, Tampere University, PO Box 692, FI-33014 Tampere, Finland.
概括
-集群显示出对进化反应 (HER) 的有希望的催化活性. 这些PtNi集群表现出最佳的吸附能量,并且可以容纳显著的负载,暗示了高效的HER催化潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 计算化学的计算化学
背景情况:
- 进化反应 (HER) 对于可持续的能源生产至关重要.
- 为HER开发高效和成本效益的电催化剂是一个关键的研究领域.
- 基于的材料具有高度活性,但价格昂贵.
研究的目的:
- 研究- (PtNi) 集群对于演化反应 (HER) 的催化特性.
- 通过密度函数模拟,探索不同 Pt:Ni 比率对 HER 活动的影响.
- 了解PtNi集群中的吸附能量和电子描述符.
主要方法:
- 使用密度函数理论 (DFT) 模拟.
- 研究了不同组成的PtNi集群 (Pt55-nNIn,n=0,12,20,28,42,55).
- 分析了吸附,电子d频段和磁性特性.
主要成果:
- PtNi集群表现出与纯 (Pt55) 相比的HER活性.
- 观察到最优的差分吸附自由能量 (dGGHΔdG <0.1 eV).
- PtNi集群可以容纳大量的负载 (每面3-4个H原子).
- 没有覆盖的集群中的磁性被吸附抑制,导致集群膨胀.
- 吸附点因成分而异:Pt-Pt桥为Pt-丰富,Ni-空洞为Pt-穷.
- 自发的H2解离发生在富含Pt的集群上.
- 与碳支持的相互作用对集群属性有很小的影响.
结论:
- PtNi集群是 HER 的有前途的电催化剂,其活性与 Pt.
- 电子和吸附性能表明高效的循环.
- PtNi合金为HER催化提供了对纯的可行替代品.
- 这些发现适用于在碳材料上支的PtNi.
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