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Issue 5, 2012
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3D branched nanowire heterojunction photoelectrodes for high-efficiency solar water splitting and H2 generation

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Abstract

We report the fabrication of a three dimensional branched ZnO/Si heterojunction nanowire array by a two-step, wafer-scale, low-cost, solution etching/growth method and its use as photoelectrode in a photoelectrochemical cell for high efficiency solar powered water splitting. Specifically, we demonstrate that the branched nanowire heterojunction photoelectrode offers improved light absorption, increased photocurrent generation due to the effective charge separation in Si nanowire backbones and ZnO nanowire branching, and enhanced gas evolution kinetics because of the dramatically increased surface area and decreased radius of curvature. The branching nanowire heterostructures offer direct functional integration of different materials for high efficiency water photoelectrolysis and scalable photoelectrodes for clean hydrogen fuel generation.

Graphical abstract: 3D branched nanowire heterojunction photoelectrodes for high-efficiency solar water splitting and H2 generation

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Publication details

The article was received on 09 Dec 2011, accepted on 18 Jan 2012 and first published on 24 Jan 2012


Article type: Paper
DOI: 10.1039/C2NR11952H
Citation: Nanoscale, 2012,4, 1515-1521
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    3D branched nanowire heterojunction photoelectrodes for high-efficiency solar water splitting and H2 generation

    K. Sun, Y. Jing, C. Li, X. Zhang, R. Aguinaldo, A. Kargar, K. Madsen, K. Banu, Y. Zhou, Y. Bando, Z. Liu and D. Wang, Nanoscale, 2012, 4, 1515
    DOI: 10.1039/C2NR11952H

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