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Issue 2, 2015
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Photoelectrochemical hydrogen evolution of tapered silicon nanowires

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Abstract

The origin of the photocurrent enhancement and the overpotential reduction in solar water splitting employing nanostructured silicon is still a matter of debate. A set of tapered Si nanowires (SiNWs) has been designed for clarifying the impact of nanostructured Si on the hydrogen evolution reaction (HER) while precisely tailoring several interference factors such as surface area, light absorption and surface defect density. We find that defect passivation by KOH achieved by tapering is much more beneficial than the optical gain. Surfactant-mediated modification of SiNWs is capable of engineering the band structure. As a result, we suggest a guideline for nanostructured Si photoelectrodes optimized for the HER.

Graphical abstract: Photoelectrochemical hydrogen evolution of tapered silicon nanowires

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Supplementary files

Article information


Submitted
29 Sep 2014
Accepted
10 Nov 2014
First published
11 Nov 2014

Phys. Chem. Chem. Phys., 2015,17, 800-804
Article type
Communication
Author version available

Photoelectrochemical hydrogen evolution of tapered silicon nanowires

X. Li, Y. Xiao, K. Zhou, J. Wang, S. L. Schweizer, A. Sprafke, J. Lee and R. B. Wehrspohn, Phys. Chem. Chem. Phys., 2015, 17, 800
DOI: 10.1039/C4CP04396K

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