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arXiv 0901.0096cond-mat.mtrl-scicond-mat.other
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迈向第一性原理电化学

Towards First-principles Electrochemistry

I. Dabo, E. Cancès, Y. L. Li, N. Marzari

摘要:

燃料电池电极上的化学吸附分子是周围电化学环境的非常灵敏的探针,并且可以用不同的光谱技术精确地监测。我们开发了一个全面的电化学模型来研究分子的化学吸附,无论是在恒定的电荷或固定的外加电压,并计算从第一性原理的振动频率的电压依赖性-振动斯塔克效应-CO吸附在紧密堆积的铂电极。预测的振动斯塔克斜率被认为是在非常好的协议与实验电化学光谱数据,从而解决以前的争议,在定量解释的原位实验和阐明规范和grand-canonicaldescriptions的振动表面现象之间的关系。

英文摘要:

Chemisorbed molecules at a fuel cell electrode are a very sensitive probe of the surrounding electrochemical environment, and one that can be accurately monitored with different spectroscopic techniques. We develop a comprehensive electrochemical model to study molecular chemisorption at either constant charge or fixed applied voltage, and calculate from first principles the voltage dependence of vibrational frequencies -- the vibrational Stark effect -- for CO adsorbed on close-packed platinum electrodes. The predicted vibrational Stark slopes are found to be in very good agreement with experimental electrochemical spectroscopy data, thereby resolving previous controversies in the quantitative interpretation of in-situ experiments and elucidating the relation between canonical and grand-canonicaldescriptions of vibrational surface phenomena.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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