M13@Pt42核心外粒子 (M = 3d过渡金属) 和其非核心外结构的相对稳定性:理论见解
Wenliang Li1, Jing Lu2, Shigeyoshi Sakaki3
1Faculty of Chemistry, Northeast Normal University, Changchun, China.
Journal of computational chemistry
|October 15, 2025
概括
本研究研究了用于燃料电池催化剂的核心外 (CS) 纳米粒子的稳定性. 晚期过渡金属如,和铜形成稳定的CS结构,与纯相比,氧吸附率降低.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 电化学 电化学 电化学
背景情况:
- 核心外 (CS) 纳米粒子与 (Pt) 外和普通金属核心是燃料电池的有希望的,具有成本效益的催化剂.
- 这些CS催化剂的稳定性,对于它们的性能至关重要,在很大程度上仍然没有特征.
研究的目的:
- 通过密度函数理论 (DFT) 计算,系统地研究二面体M13@Pt42 (M = 3d过渡金属) 核心外纳米粒子的结构稳定性.
- 为了确定核心的元素组成对Pt外的稳定性和O2吸附性能的影响.
主要方法:
- 密度函数理论 (DFT) 的计算被用来建模和比较核心 (CS) 和非核心 (NCS) 结构的能量.
- 计算的重点是从Sc到Cu的3D过渡金属作为核心 (M13) 和Pt42外.
主要成果:
- 与NCS结构相比,Co13@Pt42,Ni13@Pt42和Cu13@Pt42在CS配置中表现出更大的稳定性.
- 在NCS配置中,Sc13Pt42,Ti13Pt42,V13Pt42,Cr13Pt42,Mn13Pt42和Fe13Pt42的稳定性更高.
- 晚期的3d过渡金属 (Co,Ni,Cu) 适合于稳定的M13@Pt42 CS粒子,因为它们具有更高的电子负性和更小的原子大小.
- 氧 (O2) 吸附发生在M13@Pt42 (M=Co,Ni,Cu) CS粒子中的边缘和顶点Pt原子中.
- 这些CS催化剂的O2吸附能量低于纯Pt55,表明反应性降低.
结论:
- 晚期3D过渡金属 (Co,Ni,Cu) 是形成稳定的M13@Pt42核心外纳米粒子的理想选择.
- 核心成分显著影响Pt外的稳定性和催化活性.
- 这些发现表明,有可能开发具有定制性能的先进,更便宜的燃料电池催化剂.
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