Fluorine‐Doped Tin Oxide/Alumina as Long‐Term Robust Conducting Support for Earth‐Abundant Water Oxidation Electrocatalysts

In this work we apply a novel and simple methodology to develop a composite that consists of anodic aluminum oxide (AAO) covered by a fluorine‐doped tin oxide (FTO) film. The composite presents suitable morphological and electrical properties to be used as support for water electrooxidation catalysts based on non‐noble metals. AAO substrates were decorated with FTO via spray pyrolysis, followed by deposition of catalyst nanoparticles consisting of a cobalt‐analogue of Prussian Blue that promotes the oxygen evolution reaction. The electrodes were characterized by X‐ray Diffraction, Environmental Scanning Electron Microscopy and resistivity measurements. A promising electrocatalytic activity of the optimized AAO/FTO/PB electrode was observed at neutral pH and ambient conditions. The obtained results open a feasible strategy in the search for competitive water oxidation electrodes based on the combination of earth‐abundant metal catalysts on FTO‐covered anodized alumina supports.