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Issue 10, 2017

Water splitting using a three-dimensional plasmonic photoanode with titanium dioxide nano-tunnels

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Abstract

In this study, we developed a three-dimensional plasmonic photoanode using titanium dioxide nano-tunnels (TNTs) loaded with gold nanoparticles (Au-NPs) for water splitting, to enhance the reaction efficiency. We also optimized the procedure of loading Au-NPs on complex three-dimensional structures. We discuss the correlation between the plasmon-induced charge separation obtained from photoelectrochemical measurement and the morphology of Au-NPs observed by transmission electron microscopy. We have successfully deposited well-dispersed Au-NPs on the walls of TNTs using HAu(OH)4 as a precursor. The amount of Au-NPs on the TNTs was estimated to be approximately 15-fold larger than that on the thin film titanium dioxide substrate, and the particle size remained small. Photoelectrochemical water splitting was achieved by using a two-electrode system rather than a three-electrode system. Furthermore, stoichiometric water splitting was confirmed by estimating the amounts of the evolved H2 and O2 gases under visible light irradiation.

Graphical abstract: Water splitting using a three-dimensional plasmonic photoanode with titanium dioxide nano-tunnels

Supplementary files

Article information


Submitted
22 Nov 2016
Accepted
01 Mar 2017
First published
01 Mar 2017

Green Chem., 2017,19, 2398-2405
Article type
Paper

Water splitting using a three-dimensional plasmonic photoanode with titanium dioxide nano-tunnels

R. Takakura, T. Oshikiri, K. Ueno, X. Shi, T. Kondo, H. Masuda and H. Misawa, Green Chem., 2017, 19, 2398 DOI: 10.1039/C6GC03217F

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