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Photoelectrochemical evaluation of anatase TiO2 polycrystalline aggregation layers with different crystalline orientations

Published online by Cambridge University Press:  31 January 2011

Mamiko Kawakita ,
Jin Kawakita ,
Yoshio Sakka  and
Tadashi Shinohara
Mamiko Kawakita
Affiliation:
Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan; and Nano Ceramics Center, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan
Jin Kawakita*
Affiliation:
Advanced Photovoltaics Center, NIMS, 1-2-1 Sengen, Tsukuba 305-0047, Japan; and World Premier International Research Center Initiative on Materials anoarchitectonics, NIMS, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Yoshio Sakka
Affiliation:
Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan; Nano Ceramics Center, NIMS, 1-2-1 Sengen, Tsukuba 305-0047, Japan; and World Premier International Research Center Initiative on Materials Nanoarchitectonics, NIMS, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Tadashi Shinohara
Affiliation:
Materials Reliability Center, NIMS, 1-2-1 Sengen, Tsukuba 305-0047, Japan
*
a)Address all correspondence to this author. e-mail: KAWAKITA.Jin@nims.go.jp
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Abstract

In order to evaluate the characteristics of photocatalysts such as TiO2, it is important to separately estimate the oxidation and reduction reaction rates, since the overall reaction rate is limited by the rate-determining step. In this study, photoelectrochemical techniques were applied to thin films of crystalline oriented anatase TiO2 with polycrystalline aggregations deposited on the transparent conductive oxide (TCO) glass substrate, fabricated by the electrophoretic deposition (EPD) in a strong magnetic field. The influence of the plane orientation on the photocatalytic reaction rates was discovered for both oxidation and reduction with respect to current through the electrochemical measurements. The maximum photocurrent for the (001) plane orientation is three times higher than that for the (100) plane orientation, and is comparable with that of the random orientation. The rate of the anodic reaction determines the rate of the overall photocatalytic reaction, therefore affecting the photopotential.

Keywords

PhotochemicalPolycrystalSemiconducting
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 1: Photocatalysis for Energy and Environmental Sustainability , January 2010 , pp. 63 - 68
Copyright
Copyright © Materials Research Society 2010

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References

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