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Vol. 27 No. 3 (2015): Vol 27 Issue 3

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Silicon Nanowires/Pt for Enhanced Photo-Electrochemical Water Splitting Properties

https://doi.org/10.14233/ajchem.2015.18349
Tianhao Xu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China
Zhiyi Lu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China
Yingjie Li
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China
Haijun Xu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China
Liren Wang
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China
Xiaoming Sun
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, P.R. China

Corresponding Author(s) : Zhiyi Lu

zhiyilu1124@gmail.com

Asian Journal of Chemistry, Vol. 27 No. 3 (2015): Vol 27 Issue 3

Abstract

Incorporation of co-catalysts onto silicon-based nanomaterials has been diligently pursued as photocatalysts for water splitting. Here we employ a metal-assisted chemical etching method to fabricate different types (p type and n type) of silicon nanowire arrays (Si NWs), followed by the Pt deposition outside. The resulting Si NWs/Pt exhibits much enhanced photo-electrochemical properties, with higher photocurrent density and lower onset potential relative to the pristine silicon nanowire arrays and planar silicon due to the high surface roughness of silicon nanowire arrays and the addition of Pt catalyst. We have also demonstrated that different types of Si NWs/Pt show different enhancement effects for oxygen evolution reaction and hydrogen evolution reaction under illumination. This study demonstrates an excellent photo-electrochemical catalyst for water splitting and provides a valuable guidance for choosing the right type of silicon in terms of the target chemical reaction.

Keywords

Silicon nanowires Silicon type Photo-electrocatalysis
Xu, T., Lu, Z., Li, Y., Xu, H., Wang, L., & Sun, X. (2015). Silicon Nanowires/Pt for Enhanced Photo-Electrochemical Water Splitting Properties. Asian Journal of Chemistry, 27(3), 1102–1106. https://doi.org/10.14233/ajchem.2015.18349
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