Epitaxial p-type SiC as a self-driven photocathode for water splitting |
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Authors: | Masashi Kato Tomonari Yasuda Keiko Miyake Masaya Ichimura Tomoaki Hatayama |
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Affiliation: | 1. Dept. of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 4666-8555, Japan;2. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan |
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Abstract: | Solar-to-hydrogen conversion efficiencies of water-splitting photochathodes using epitaxially grown p-type 4H-, 6H- and 3C-SiC were estimated in a two-electrode system without applying any external bias. By using electrode materials with small oxygen overpotentials as counter electrodes, the photocurrent became comparable to that observed in a three-electrode system with a suitable bias. Estimated efficiencies seem to depend on the bandgap of the SiC polytypes. For the 3C-SiC, the obtained efficiency was 0.38%, which is so far the highest value reported for SiC. We confirmed that the hydrogen volumes estimated from the photocurrent were almost the same as actual volumes observed by gas chromatography. |
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Keywords: | SiC Photochathode Water-splitting Conversion efficiency |
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