期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 46, 页码 17246-17249出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja407462g
关键词
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资金
- NSF [CHE-1214152]
- Dept. of Defense through the National Defense Science & Engineering Graduate Fellowship Program
- U.S. Dept. of Energy, Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under EERE Fuel Cell Technologies Program
- U.S. Dept. of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1214152] Funding Source: National Science Foundation
The behavior of graphene-coated n-type Si(111) photoanodes was compared to the behavior of H-terminated n-type Si(111) photoanodes in contact with aqueous K-3[Fe(CN)(6)]/K-4[Fe(CN)(6)] as well as in contact with a series of outer-sphere, one-electron redox couples in nonaqueous electrolytes. The n-Si/Graphene electrodes exhibited stable short-circuit photocurrent densities of over 10 mA cm(-2) for >1000 s of continuous operation in aqueous electrolytes, whereas n-Si-H electrodes yielded a nearly complete decay of the current density within similar to 100 s. The values of the open-circuit photovoltages and the flat-band potentials of the Si were a function of both the Fermi level of the graphene and the electrochemical potential of the electrolyte solution, indicating that the n-Si/Graphene did not form a buried junction with respect to the solution contact.
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