Surface-reaction induced structural oscillations in the subsurface.,Nature Communications

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Surface-reaction induced structural oscillations in the subsurface.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-16 , DOI: 10.1038/s41467-019-14167-1
Xianhu Sun ₁ , Wenhui Zhu ₁ , Dongxiang Wu ₁ , Chaoran Li ₁ , Jianyu Wang ₁ , Yaguang Zhu ₁ , Xiaobo Chen ₁ , Jorge Anibal Boscoboinik ₂ , Renu Sharma ₃ , Guangwen Zhou ₁

Affiliation

Surface and subsurface are commonly considered as separate entities because of the difference in the bonding environment and are often investigated separately due to the experimental challenges in differentiating the surface and subsurface effects. Using in-situ atomic-scale transmission electron microscopy to resolve the surface and subsurface at the same time, we show that the hydrogen-CuO surface reaction results in structural oscillations in deeper atomic layers via the cycles of ordering and disordering of oxygen vacancies in the subsurface. Together with atomistic calculations, we show that the structural oscillations in the subsurface are induced by the hydrogen oxidation-induced cyclic loss of oxygen from the oxide surface. These results demonstrate the propagation of the surface reaction dynamics into the deeper layers in inducing nonstoichiometry in the subsurface and have significant implications in modulating various chemical processes involving surface-subsurface mass transport such as heterogeneous catalysis, oxidation, corrosion and carburization.

中文翻译：

表面反应引起地下结构振动。

由于粘合环境的差异，表面和次表面通常被认为是单独的实体，并且由于区分表面和次表面效应的实验挑战而经常单独研究。利用原位原子级透射电子显微镜同时解析表面和次表面，我们发现氢-CuO表面反应通过氧空位的有序和无序循环导致更深原子层的结构振荡。地下。结合原子计算，我们表明地下的结构振荡是由氢氧化引起的氧化物表面氧的循环损失引起的。这些结果表明，表面反应动力学传播到更深的层中，在地下诱导非化学计量，并且对于调节涉及表面-地下质量传递的各种化学过程（例如多相催化、氧化、腐蚀和渗碳）具有重要意义。

更新日期：2020-01-17

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