Power up: The photoelectrochemical performance of hematite in a water-splitting device was improved significantly through surface modification with amorphous NiFeOx (see graph showing the large cathodic shift observed; FTO=fluorine-doped tin oxide). The measured photovoltage increased from 0.24 to 0.61 V, which yielded a record-low turn-on potential of 0.62 V (versus the reversible hydrogen electrode, RHE).
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Du et al. (2013) studied this question.
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