Single‐step anodization in NH4F‐based ethylene glycol electrolyte containing KRuO4 and H2O led to the production of high‐aspect‐ratio TiO2 nanotubes (NTs) with a doping of ruthenium oxide. These NTs were successfully used as electrodes for water oxidation in KOH. This method offers homogenous incor poration of a small amount of ruthenium oxide (≈0.12 wt %) into 25 μm TiO2 nanotubes without the need for complicated facilities or steps. The addition of H2O into electrolytes is a key step for the stable adhesion of long‐length TiO2 NT films on a substrate. The tips of the TiO2 nanotubes prepared by this novel method are not easily dissolved by electrolyte because the walls of the nanotubes are thickened by a factor of more than two in response to the addition of KRuO4 and H2O. The longest nanotubular TiO2 with a doping of ruthenium oxide and no wall dissolution shows the largest current density in the oxygen‐evolution reaction.

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A binder-free SnO2–TiO2 composite, where SnO2 is encapsulated into hollow TiO2, is designed for inhibiting performance degradation for a stable LIB anode.

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