The oxidation and reduction of a bimetallic Ni/Rh model catalyst during the water forming ${\mathrm{O}}_2+{\mathrm{H}}_2$ reaction is studied with low-energy electron microscopy, microspot-low-energy electron diffraction, and x-ray photoemission electron microscopy. Oxidation of a submonolayer Ni film results in the formation of three-dimensional (3D) NiO nanoparticles. Reduction of 3D-NiO in ${\mathrm{H}}_2$ produces a dispersed two-dimensional film of metallic Ni. Chemical waves during the ${\mathrm{O}}_2+{\mathrm{H}}_2$ reaction involve a cyclic transformation between 3D-NiO and 2D-NiO.

中文翻译：

---

形态不稳定性和动力学不稳定性的耦合：双金属Ni / Rh（111）表面上氢氧化中的化学波

Ni / Rh双金属模型催化剂在水形成过程中的氧化和还原 ${\mathrm{Ø}}_{\mathrm{2个}}+{\mathrm{H}}_{\mathrm{2个}}$反应通过低能电子显微镜，微点低能电子衍射和X射线光发射电子显微镜研究。亚单层镍膜的氧化导致形成三维（3D）NiO纳米颗粒。还原3D-NiO${\mathrm{H}}_{\mathrm{2个}}$产生金属Ni的二维分散膜。期间的化学波${\mathrm{Ø}}_{\mathrm{2个}}+{\mathrm{H}}_{\mathrm{2个}}$ 反应涉及3D-NiO和2D-NiO之间的循环转变。