This work aimed at preparing and characterizing TiO
2 nanotube supported hydrated ruthenium oxide catalysts. First of all, we succeeded in preparing TiO
2 nanotube arrays by electrochemical anodization of titanium metal at 20 V for 8 h in a 1M H
3
PO
4+0.5 wt% HF solution as evidenced from scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS) results. The hydrated ruthenium oxide was then deposited onto TiO
2 nanotubes by consecutive exchange of protons by Ru
3+ ions, followed by formation of hydrated oxide during the alkali treatment. Further XPS measurements showed that the modified samples contain not only hydrated ruthenium oxide but also hydrated ruthenium species Ru(III)-OH.
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