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Dependence of photoelectrochemical performance on TiO2 nanorod length

Published online by Cambridge University Press:  07 January 2013

Jen-Chun Chou ,
Min-Han Yang  and
Jon-Yiew Gan
Jen-Chun Chou
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
Min-Han Yang
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
Jon-Yiew Gan
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
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Abstract

TiO2 is one of the most promising photoanodes for solar-hydrogen conversion by water splitting. Recently, hydrothermally synthetic rutile TiO2 nanorods (NRs) show outstanding photoelectrochemical (PEC) performance in water splitting because of its large surface area, fast carrier transport, and short diffusion length. However, light absorption and carrier transport conflict. Few have investigated the dependence of PEC performance on NR length. This study examines how different TiO2 NR lengths grown on an FTO substrate affects their PEC performance when splitting water. The results show that the optimal absorption length of rutile TiO2 NRs is 3.75 μm. However, under simulated solar illumination (AM1.5 G), the maximum PEC efficiency of these TiO2 NRs is 0.33% at a length of 500 nm. This suggests that carrier transport is the most important variable for improving PEC efficiency.

Keywords

Tinanostructurephotochemical
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1512: Symposium FF – Semiconductor Nanowires—Optical and Electronic Characterization and Applications , 2013 , mrsf12-1512-ff13-08
Copyright
Copyright © Materials Research Society 2012

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