Photocatalytic effect of SrZnO 2 thin films
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Erratum Photocatalytic effect of SrZnO2 thin films – ERRATUM Tohru Okamoto, Tara Ogita, Susumu Harako, Shuji Komuro, and Xinwei Zhao doi: 10.1557/opl.2013.1147, Published by Materials Research Society, 28 November 2013. The article by Okamoto et al. was published with the incorrect volume number. The correct volume number is Volume 1601. The Materials Research Society and Cambridge University Press apologize to the authors for this error. The correct version of the article follows this notice.
Reference Tohru Okamoto, Taro Ogita, Susumu Harako, Shuji Komuro and Xinwei Zhao (2013). Photocatalytic effect of SrZnO2 thin films. MRS Online Proceedings Library, 1601, jsapmrs13-1601-6436 doi:10.1557/opl.2013.1147.
Mater. Res. Soc. Symp. Proc. Vol. 1601 © 2013 Materials Research Society DOI: 10.1557/opl.2013 .1147
Photocatalytic effect of SrZnO2 thin films Tohru Okamoto1, Taro Ogita1, Susumu Harako1, Shuji Komuro2, and Xinwei Zhao1 1 Advanced Device Laboratories and Department of Physics, Tokyo University of Science. Shinjuku, Tokyo 162-8601, Japan 2 Toyo University, Kawagoe, Saitama 350-8585, Japan Phone: +81-3-3260-4272 E-mail: [email protected]
ABSTRACT The SrZnO2 thin films were fabricated by using laser ablation method. The films were annealed after deposition in order to improve the crystallinity. Water splitting experiments were carried out and hydrogen production over the SrZnO2 thin films were confirmed with no applied bias. The band gap of SrZnO2 was 3.41 eV which is 0.15 eV larger than that of ZnO. It suggests that the band gap was increased by doping Sr to ZnO, and the reducibility was improved. As a result, the rate of photocatalytic hydrogen production over the SrZnO2 was increased compared to ZnO. INTRODUCTION The environmental and energy problems are very important issues these days [1]. The photocatalytic water-splitting, known as Honda-Fujishima effect [2-4], attracted much attention as promising technology for clean and renewable hydrogen fuel [5]. Zinc Oxide (ZnO) is one of the well-known photocatalysts, and it has been studied intensively. However ZnO holds the drawback of photocorrosion caused by photo-generated holes with high oxidizing power [6-11], and the efficiency of hydrogen production is not high due to small difference between flat-band potential and hydrogen evolution potential. These disadvantages have blocked the application of ZnO as a photocatalyst. The main objective of our research is to increase the efficiency of photocatalytic hydrogen production using photocatalyst ZnO. In our previous study, the photocatalytic hydrogen production over ZnO thin film was confirmed [12]. However, reducibility of ZnO was low and the efficiency of hydrogen production was not high. In this work, we aimed to improve the reducibility of ZnO by doping strontium (Sr) for the purpose of enhancing hydrogen production. The conduction band minimum of ZnO is slightly higher than the hydrogen evolution potential. Therefore it is necessary to raise the position of conduction band minimum in order to impr
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