水膜沉和Pt上的进化的相互作用:来自机器生成的原子间电位的洞察力
Michael E Foster1, Norman C Bartelt1, Reese E Jones1
1Sandia National Laboratories, Livermore, California 94550, USA.
The Journal of chemical physics
|October 22, 2025
概括
了解演变反应 (HER) 动力学需要考虑金属界面上的不同水密度. 生成发生在低密度水域,而质子交换发生在高密度区域,影响整体反应速率.
科学领域:
- 电化学 电化学 电化学
- 表面科学是一门学科.
- 计算化学计算化学
背景情况:
- 在金属表面的演化反应 (HER) 的动力学对于高效的生成至关重要,但仍然不太了解.
- 水-金属接口环境的复杂异质性使HER动力学的准确建模变得复杂.
- 需要开发计算高效的方法来建模复杂的水电解质接口.
研究的目的:
- 开发和应用一个计算效率高的隐性电解质方法来建模在电化学接口的演变反应.
- 用ab initio动力学和密度函数理论研究水密度和接口结构对HER动力学的影响.
- 确定控制动态水金属界面反应机制的关键因素.
主要方法:
- 采用隐式电解质方法与ab initio动力学相结合.
- 用密度函数理论 (DFT) 来显式建模表面化学.
- 通过Poisson-Boltzmann电解质模型进行内置的离子选 (连续近似).
主要成果:
- 从质量上发现,气生成发生在低密度水域 (潮湿区域).
- 证明了与金属原子的质子交换发生在高密度水域.
- 确定了一个潜在的速度限制步骤:在这些不同的区域之间扩散.
结论:
- 生成的位置与质子与水交换的位置不同.
- 在接口的水密度变化显著影响了HER动力学.
- 低水密度和高水密度区域之间的气扩散是整体HER效率的关键因素.
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