DFT对基于Mo的MXenes上的单金属原子稳定性的洞察力,这些MXenes是由联体效应驱动的
Kai-Yin Wu1, Zi-Yang Feng1, Zhi Li1
1School of Energy and Power Engineering, Jiangsu University of Science and Technology, 212003, Zhenjiang, Jiangsu, China. xiaobb11@mails.jlu.edu.cn.
Physical chemistry chemical physics : PCCP
|February 25, 2026
概括
双金属MXenes通过加强组金属 (PGM) 定,增强单原子催化剂 (SAC) 的稳定性. 这项研究揭示了在MXenes上稳定SAC的设计原则,以改善催化应用.
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.
- 计算化学计算化学
背景情况:
- MXenes是新兴的2D材料,具有可调节的特性,适用于支持单原子催化剂 (SAC).
- 在MXene支上稳定组金属 (PGM) 单个原子对于它们的催化活性和耐用性至关重要.
研究的目的:
- 调查订购的基于Mo的双金属MXenes作为在Mo空缺处稳定PGM单个原子的支.
- 了解控制PGM-MXene相互作用和催化反应的电子和结构因素.
主要方法:
- 密度函数理论 (DFT) 的计算被用来研究双金属MXene结构 (o-Mo2M′′C2).
- 电子描述符的分析,包括p-d带中心差异 (δ),用于与PGM结合强度相关联.
- 机器学习 (XGBoost) 用于识别影响吸附能量的关键描述因素.
主要成果:
- 由于配体效应,双金属MXenes与Mo-only MXenes相比显著提高了PGM anchoring和烧结阻力.
- 一个新的描述符, δ = εp - εd,有效地捕捉了PGM和MXenes之间的结合强度.
- 机器学习确定了平均负电子度 (χavg) 作为PGM-MXene吸附能量的另一个关键描述符.
结论:
- 订制的基于Mo的双金属MXenes是稳定PGM单个原子的有效支持.
- 该研究提供了关于在MXenes上开发强大的SAC的合理设计原则的原子层次见解.
- 这些发现为先进的催化材料的实验合成和应用提供了指导方针.
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