Hematite‐Based Water Splitting with Low Turn‐On Voltages

Abstract

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).