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In this study we investigate the structural and chemical changes of monatomicCoO$_2$ chains grown self-organized on the Ir(100) surface [P. Ferstl et al.,PRL 117, 2016, 046101] and on Pt(100) under reducing and oxidizing conditions.By a combination of quantitative low-energy electron diffraction, scanningtunnelling microscopy, and density functional theory we show that the cobaltoxide wires are completely reduced by H$_2$ at temperatures above 320 K and a3x1 ordered Ir$_2$Co or Pt$_2$Co surface alloy is formed. Depending ontemperature the surface alloy on Ir(100) is either hydrogen covered (T < 400 K)or clean and eventually undergoes an irreversible order-disorder transition atabout 570 K. The Pt$_2$Co surface alloy disorders with the desorption ofhydrogen, whereby Co submerges into subsurface sites. Vice versa, applyingstronger oxidants than O$_2$ such as NO$_2$ leads to the formation of CoO3chains on Ir(100) in a 3x1 superstructure. On Pt(100) such a CoO$_3$ phasecould not be prepared so far, which however, is due to the UHV conditions ofour experiments. As revealed by theory this phase will become stable in aregime of higher pressure. In general, the structures can be reversiblyswitched on both surfaces using the respective agents O$_2$, NO$_2$ and H$_2$.

Monatomic Co, CoO$_2$, and CoO$_3$ Nanowires on Ir(100) and Pt(100) surfaces: Formation, Structure, and Energetics