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Application of ZnO single crystals for light-induced water splitting under UV irradiation |
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| Authors: | Yuriy Suhak Katarzyna Izdebska Pawe? Skupiński Aleksandra Wierzbicka Anna Reszka Piotr Sybilski Bogdan J Kowalski Andrzej Mycielski Zbigniew R Zytkiewicz Micha? Soszko Andrzej Suchocki |
| Affiliation: | 1. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland;2. Industrial Chemistry Research Institute, Rydygiera 8, 01-793 Warsaw, Poland;3. Institute of Physics, University of Bydgoszcz, Weyssenhoffa 11, 85-072 Bydgoszcz, Poland |
| Abstract: | This paper presents experimental results of implementation of ZnO single crystals as photoanodes in photoelectrochemical (PEC) cells for hydrogen generation through the process of water splitting. Both, as-grown and O2-annealed ZnO single crystals were investigated for this purpose. A 351 nm argon laser line was used as the light source. The XRD investigations showed that used ZnO crystals are of good crystalline quality. It was found that the as-grown ZnO single crystals possess higher conversion efficiencies comparing to the O2-annealed one. The photocurrent density was found to increase significantly with the increase of external bias applied and excitation light intensity. Time dependent photocurrent density characteristics showed that the decay of photocurrent density was not observed within the measurement time. The differences in behaviour of the as-grown and the annealed in O2 ZnO single crystals are discussed in terms of crystals intrinsic defects. |
| Keywords: | Oxides Semiconductors Crystal growth Electrochemical techniques Electron microscopy (SEM) |
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