Photoelectrochemical behaviour of n-silicon photoanodes coated with chromium(III) oxide films and Cr2O3 containing composite layers |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, People''s Republic of China;2. College of Science, China University of Petroleum, Qingdao 266580, Shandong, People''s Republic of China;1. VKTECH Research Center, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Viet Nam;2. Semiconductor Physics Research Center, School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju City, 561-756, South Korea;3. LED Agri-bio Fusion Technology Research Center (LAFTRC), Chonbuk National University, Jeonju City, 561-756, South Korea;1. Department of Physics, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand;2. Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand;3. Department of Applied Science for Electronics and Materials, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan;1. Department of Physics, Guilan University, Rasht, Iran;2. Department of Engineering Sciences, Sabalan University of Advanced Technologies (SUAT), Namin, Iran;3. Department of Advanced Technologies, Institute of Science and Technology, Gazi University, Ankara, Turkey;4. Department of Physics, Faculty of Sciences, Gazi University, Ankara, Turkey;5. Department of Physics, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran;1. Institute of Chemistry, University of the Punjab, Lahore, Pakistan;2. Department of Chemistry, COMSATS University, Abbottabad Campus, 22060, Pakistan |
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| Abstract: | n-Type silicon single crystals coated with Cr2O3-containing composite and/or p-Cr2O3 thin films were studied as photoanodes for electrocatalytic photo-oxidation of isopropanol in aqueous media. Film deposition was by pyrolysis of organometallic compounds (i.e. chemical vapour deposition) for Cr2O3 and by a ceramic technique for the Cr2O3-containing composite. The photocurrent at the heterojunction electrodes illuminated with visible light is produced by holes which are photoexcited in n-silicon only. There is no energy barrier for minority carriers to be transferred across the n-p heterojunction, so considerable quantum efficiencies of photocurrent are observed. Heterogeneous redox catalysis is responsible for the oxidation of isopropanol with Cr2O3 as electrocatalyst. The use of a composite coating makes the photoanode highly stable, kinetics at the electrode/electrolyte interface being a key factor for the stability against photocorrosion. |
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