Journal
NANO LETTERS
Volume 13, Issue 11, Pages 5615-5618Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403265k
Keywords
Water splitting hydrogen production; photochemistry; high photovoltage; a-Si photocathodes
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Funding
- Office of Science of the U.S. Department of Energy [DE-SC0004993]
- WCU program at Sunchon National University
- Swiss Federal Office of Energy
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An amorphous Si thin film with TiO2 encapsulation layer is demonstrated as a highly promising and stable photocathode for solar hydrogen production. With platinum as prototypical cocatalyst, a photocurrent onset potential of 0.93 V vs RHE and saturation photocurrent of 11.6 mA/cm(2) are measured. Importantly, the a-Si photocathodes exhibit impressive photocurrent of similar to 6.1 mA/cm(2) at a large positive bias of 0.8 V vs RHE, which is the highest for all reported photocathodes at such positive potential. Ni-Mo alloy is demonstrated as an alternative low-cost catalyst with onset potential and saturation current similar to those obtained with platinum. This low-cost photocathode with high photovoltage and current is a highly promising photocathode for solar hydrogen production.
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