Hydrogen adsorption on nano-structured platinum electrodes,Faraday Discussions

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Hydrogen adsorption on nano-structured platinum electrodes
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-03-27 , DOI: 10.1039/c8fd00062j
Oscar Diaz-Morales _{1,

2,

3,

4} , Thomas J. P. Hersbach _{1,

2,

3,

4} , Cansin Badan _{1,

2,

3,

4} , Amanda C. Garcia _{1,

2,

3,

4} , Marc T. M. Koper _{1,

2,

3,

4}

Affiliation

The “hydrogen region” of platinum is a powerful tool to structurally characterize nanostructured platinum electrodes. In recent years, the understanding of this hydrogen region has improved considerably: on Pt(111) sites, there is indeed only hydrogen adsorption, while on step sites, the hydrogen region involves the replacement of adsorbed hydrogen by adsorbed hydroxyl which interacts with co-adsorbed cations. However, the hydrogen region features an enigmatic and less well-understood “third hydrogen peak”, which develops on oxidatively roughened platinum electrodes as well as on platinum electrodes with a high (110) step density that have been subjected to a high concentration of hydrogen. In this paper, we present evidence that the peak involves surface-adsorbed hydrogen (instead of subsurface hydrogen) on a locally “reconstructed” (110)-type surface site. This site is unstable when the hydrogen is oxidatively removed. The cation sensitivity of the third hydrogen peak appears different from other step-related peaks, suggesting that the chemistry involved may still be subtly different from the other features in the hydrogen region.

中文翻译：

纳米结构铂电极上的氢吸附

铂的“氢区”是一种强大的工具，可以在结构上表征纳米结构的铂电极。近年来，对该氢区域的了解已大大改善：在Pt（111）位置上，确实只有氢吸附，而在台阶位置，该氢区域涉及被吸附的羟基取代吸附的氢，该羟基与共价氢相互作用。吸附的阳离子。但是，氢区具有一个难以理解且难以理解的“第三氢峰”，该峰在氧化粗化的铂电极上以及在经受高浓度氢浓度的高（110）步长密度的铂电极上形成。在本文中，我们提供的证据表明，该峰涉及局部“重构”（110）型表面位点上的表面吸附氢（而不是地下氢）。当氢被氧化去除时，该位点是不稳定的。第三个氢峰的阳离子敏感性似乎与其他与步相关的峰不同，这表明所涉及的化学性质可能仍与氢区域中的其他特征有所不同。

更新日期：2018-10-10

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