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Higher water splitting hydrogen generation rate for single crystalline anatase phase of TiO2 nanotube arrays

Published online by Cambridge University Press:  03 September 2012

C.W. Lai  and
S. Sreekantana
C.W. Lai
Affiliation:
School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia
S. Sreekantana*
Affiliation:
School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia
*
ae-mail: srimala@eng.usm.my
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Abstract

This paper presents a detailed investigation on the effect of heat-treatment process on the highly ordered titanium dioxide (TiO2) nanotube arrays in connection with the photoelectrochemical (PEC) response and hydrogen evolution rate. TiO2 nanotube arrays have been systematically heat-treated to control the transformation of as-anodized TiO2 amorphous structure to crystalline anatase and rutile phases. In this study, single crystalline TiO2 anatase phase exhibited a higher PEC response and hydrogen evolution rate at 400 °C heat treatment. The photocurrent density increase was mainly attributed to the effective transport of photo-induced electrons within the single crystal anatase phase. However, polycrystalline anatase and rutile phases showed the fluctuation in lower photocurrent density upon heat treatment above 500 °C. The mobility of photo-induced electrons was obviously hindered due to the recombination losses in defect sites between the anatase and rutile phase.

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Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 59 , Issue 2 , August 2012 , 20403
Copyright
© EDP Sciences, 2012

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