期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 17, 页码 5414-5422出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta00048f
关键词
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资金
- Converging Research Center Program through the Ministry of Education, Science and Technology [2012K001290]
- Basic Science Research Program [2011-0001225]
- Global Frontier R&D Program on Center for Multiscale Energy System [2011-0031574]
- National Research Foundation under the Ministry of Education, Science and Technology, Korea
Hydrogen production from solar power energy is an important energy and environmental issue. Silicon (Si) has been widely studied as a photocathode for hydrogen production from water splitting. In this study, the electrochemical behavior of a Si photocathode for water splitting is highly dependent on its nanostructure. The optimum nanostructure of a Si photocathode exhibits an enhanced photocurrent and a lower overpotential compared to the planar bulk Si. The limiting current density of nanostructured Si is 1.58 times greater than that of the planar structure for p-type Si/aqueous electrolyte solution. Nanostructured Si without any catalyst notably produced a current density of -10.65 mA cm(-2) under Air Mass 1.5 Global conditions with a light intensity of 100 mW cm(-2) at the reversible potential vs. reversible hydrogen electrode, which is about 43 times higher than that of the untreated Si structure. The solar-to-hydrogen conversion efficiency of the optimized Si nanowire without depositing any catalyst has reached up to about 70% of the efficiency of planar Si decorated with Pt. This significant enhancement achieved in this study emphasizes the importance of a controlled nanostructure in the development of highly efficient photoelectrochemical devices for hydrogen production.
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