Co-Pi cat: The surface of a BiVO4 film obtained by heteroepitaxy, displaying a morphology akin to interconnected walls, is decorated with Co-Pi catalysts in order to obtain an efficient water-splitting catalyst. Qualitative analysis confirms an increased efficiency of photon use, attributable to the suppression of both bulk and surface recombination owing to the combined effects of heteroepitaxy and surface modification, respectively.
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