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Issue 7, 2012
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Nickel oxide functionalized silicon for efficient photo-oxidation of water

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Abstract

We report a nickel oxide (NiOx) thin film, from a cost-effective sol–gel process, coated n-type silicon (n-Si) as a photoanode for efficient photo-oxidation of water under neutral pH condition. The NiOx thin film has three functions: (i) serves as a protection layer to improve the chemical stability of the Si photoelectrode, (ii) acts as an oxygen evolution catalyst, and (iii) provides junction photovoltage to further reduce overpotential. The oxygen evolution onset potential is reduced to below the thermodynamic water oxidation level and oxygen evolution was observed at low overpotentials. Our results demonstrate the fabrication of robust photoelectrodes from low-cost NiOx and Si, which enable a practical solar water oxidation with high efficiency.

Graphical abstract: Nickel oxide functionalized silicon for efficient photo-oxidation of water

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Supplementary files

Article information


Submitted
21 Mar 2012
Accepted
17 Apr 2012
First published
17 Apr 2012

Energy Environ. Sci., 2012,5, 7872-7877
Article type
Communication

Nickel oxide functionalized silicon for efficient photo-oxidation of water

K. Sun, N. Park, Z. Sun, J. Zhou, J. Wang, X. Pang, S. Shen, S. Y. Noh, Y. Jing, S. Jin, P. K. L. Yu and D. Wang, Energy Environ. Sci., 2012, 5, 7872
DOI: 10.1039/C2EE21708B

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