The deposition of cobalt-phosphate onto photocatalytic haematite improves its ability to split water and thus create clean hydrogen fuel. The source of this improvement is, however, not yet understood, and now two separate studies suggest different roles for the deposited cobalt-phosphate.
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Gamelin, D. Catalyst or spectator?. Nature Chem 4, 965–967 (2012). https://doi.org/10.1038/nchem.1514
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DOI: https://doi.org/10.1038/nchem.1514
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