形成电极-电解质接口的初步步骤:H2O 吸附和Ag上的复杂形成 量子力学计算和环境压力X射线光电子光谱的结合
Jin Qian1,2, Yifan Ye3,4,5, Hao Yang2
1Joint Center for Artificial Photosynthesis , California Institute of Technology , Pasadena , California 91125 , United States.
Journal of the American Chemical Society
|April 5, 2019
概括
研究人员使用量子力学和光谱学研究银表面的水吸附. 他们确定了五种氧气物种,并开发了一种模型,预测它们在各种条件下的行为,进步了电催化理解.
科学领域:
- 表面科学
- 物理化学
- 电催化
背景情况:
- 了解电极-电解质接口 (EEI) 对电催化非常重要.
- 水在金属表面的原子相互作用仍然不太清楚.
研究的目的:
- 在Ag111) 表面研究初始吸附水和复合物形成.
- 双量子力学 (QM) 模拟与环境压力X射线光电子光谱 (APXPS) 实验.
- 在不同条件下识别和量化含氧物种.
主要方法:
- 结合QM计算与APXPS实验
- 分析了O1s核心水平的变化以确定物种.
- 作为温度和压力的函数计算结构和自由能量.
- 开发了一个化学反应网络 (CRN) 模型.
主要成果:
- 确定了五种含氧物种:O*,OH*,H2O* (通过键稳定) 和多层H2O*.
- 已证明物种度对温度和压力的敏感依赖.
- 在实验数据和基于QM的CRN预测之间取得了很好的一致性.
- 在各种等热和等条件下验证的结果.
结论:
- 建立了对Ag的初始吸水步骤的详细了解.
- 开发了一个强大的仿真协议 (CRN) 来预测物种进化.
- 该方法适用于其他异质催化系统.
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