期刊
ACS ENERGY LETTERS
卷 3, 期 2, 页码 307-314出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b01138
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) and U.S. Department of Energy EERE Program [EE0008086]
- DOE [DESC0011385]
The performance of overall solar water splitting has been 12 largely limited by the half-reaction of water oxidation. Here, we report a L7 eV bandgap InGaN nanowire photoanode for efficient solar water oxidation. It produces a low onset potential of 0.1 V versus a reversible hydrogen electrode (RHE) and a high photocurrent density of 5.2 mA/cm(2) at a potential as low as 0.6 V versus RHE. The photoanode yields a half-cell solar energy conversion efficiency up to 3.6%, a record for a single-photon photoanode to our knowledge. Furthermore, in the presence of hole scavengers, the photocurrent density of the InGaN photoanode reaches 21.2 mA/cm(2) at 1.23 V versus RHE, which approaches the theoretical limit for a 1.7 eV InGaN absorber. The InGaN nanowire photoanode may serve as an ideal top cell in a photoelectrochemical tandem device when stacked with a 0.9-1.2 eV bandgap bottom cell, which can potentially deliver solar-to hydrogen efficiency over 25%.
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