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Hematite-Based Water Splitting with Low Turn-On Voltages


  • This research was supported by the NSF (DMR 1055762 and 1317280). D.W. is an Alfred P. Sloan Fellow. We thank J. Bisquert and S. Gimenez for insightful discussions. We also thank P. Dai for his technical assistance.


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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).