期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 21, 页码 11346-11350出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01814
关键词
water splitting; photoelectrochemical cell; renewable energy; gallium indium phosphide; phosphonic acid
资金
- Laboratory Directed Research and Development (LDRD) Program at the National Renewable Energy Laboratory (NREL)
The p-type semiconductor GaInP2 has a nearly ideal bandgap (similar to 1.83 eV) for hydrogen fuel generation by photoelectrochemical water splitting but is unable to drive this reaction because of misalignment of the semiconductor band edges with the water redox half reactions. Here, we show that attachment of an appropriate conjugated phosphonic acid to the GaInP2 electrode surface improves the band edge alignment, closer to the desired overlap with the water redox potentials. We demonstrate that this surface modification approach is able to adjust the energetic position of the band edges by as much as 0.8 eV, showing that it may be possible to engineer the energetics at the semiconductor/electrolyte interface to allow for unbiased water splitting with a single photoelectrode having a bandgap of less than 2 eV.
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