期刊
NANO LETTERS
卷 18, 期 10, 页码 6530-6537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03087
关键词
Gallium nitride; silicon; photocathode; water splitting; hydrogen; solar fuel; nanowire
类别
资金
- HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office [DE-EE0008086]
- Emissions Reduction Alberta
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Fuel Cell Technologies Office
- NSF [DMR-0723032]
- College of Engineering, University of Michigan
- NSERC
- Canada Foundation for Innovation under the Major Science Initiative program
- McMaster University
Photoelectrochemical water splitting is a clean and environmentally friendly method for solar hydrogen generation. Its practical application, however, has been limited by the poor stability of semiconductor photoelectrodes. In this work, we demonstrate the use of GaN nanostructures as a multifunctional protection layer for an otherwise unstable, low-performance photocathode. The direct integration of GaN nanostructures on n(+)-p Si wafer not only protects Si surface from corrosion but also significantly reduces the charge carrier transfer resistance at the semiconductor/liquid junction, leading to long-term stability (>100 h) at a large current density (>35 mA/cm(2)) under 1 sun illumination. The measured applied bias photon-to-current efficiency of 10.5% is among the highest values ever reported for a Si photocathode. Given that both Si and GaN are already widely produced in industry, our studies offer a viable path for achieving high-efficiency and highly stable semiconductor photoelectrodes for solar water splitting with proven manufacturability and scalability.
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