原子层面的洞察力 尼子集群支持在N终端钻石 (111) 表面上的HER,OER和ORR
Wei Cheng1, Nan Gao1, Shaoheng Cheng1
1State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
The journal of physical chemistry letters
|September 15, 2025
概括
这项研究探讨了钻石表面上的集群作为先进的催化剂. Ni7集群显示出优秀的进化,而Ni4和Ni2集群在氧反应中表现出色,为提供了高效的替代品.
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.
- 表面化学 表面化学
背景情况:
- 单集群催化剂 (SCC) 是单原子和纳米粒子催化剂的桥梁,具有独特的特性.
- 在N终端钻石 (111) 表面 (Nix@ND) 上的集群 (Nix) 被研究用于电催化应用.
- 了解结构-活动关系对于设计高效的催化剂至关重要.
研究的目的:
- 系统地研究Nix@ND (x=2-9) 的结构模型,用于电催化.
- 为了评估这些SCC的演变反应 (HER),氧演变反应 (OER) 和氧减少反应 (ORR) 的性能.
- 阐明尺寸效应和电子结构对催化活动的贡献.
主要方法:
- 使用晶体结构分析 (CALYPSO) 方法进行晶体结构预测.
- 密度功能理论 (DFT) 计算以评估结构稳定性和催化性能.
- 分析反应描述符,如Ni-H结合强度和吉布斯自由能量 (ΔG*H).
主要成果:
- Ni7@ND 具有 ΔG*H = -0.25 eV 的最佳 HER 性能,与基于 Pt 的催化剂相比较.
- Ni4@ND和Ni2@ND表现出优越的OER和ORR活动,具有较低的超电位 (η),性能优于单原子Ni1@ND.
- 尺寸效应通过缩小带间隙和增加活性位点来增强催化活性,优化电荷再分配.
结论:
- Nix@ND SCC 显示出有效的 HER,OER 和 ORR 的巨大潜力.
- 催化剂的性能与集群大小,电子结构和反应中间体的吸附能量密切相关.
- 这项工作为设计用于多种电化学反应的先进的基于钻石的SCC提供了原子水平的见解.
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