Cobalt oxide as photocatalyst for water splitting: Temperature-dependent phase structures |
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| Affiliation: | 1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. School of Chemical Sciences and Food Technology, Faculty of Science and Technology Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;1. State Key Laboratory of Information Photonics and Optical Communications and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China;2. Xi’an University of Science and Technology, Xi’an 710054, China;1. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Chemical and Process Engineering, Niroo Research Institute, Tehran, Iran;1. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan, ROC;2. Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan, ROC;3. Department of Physics, National Chung Hsing University, Taichung 402, Taiwan, ROC;4. Institute of Nanoscience, National Chung Hsing University, Taichung 402, Taiwan, ROC;5. Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam;6. Division of Mechanics, Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan, ROC;1. Physical Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India;2. Department of Chemistry, Sree Chaitanya College, Habra 24PGS (N) - 743268, India;3. Department of Physics, University of Burdwan, Burdwan 713104, India;1. Department of Energy Resources Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria 21934, Egypt;2. Mechanical Engineering Department, Assiut University, Assiut 71516, Egypt;3. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada |
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| Abstract: | This study investigated the best phases of cobalt oxide for the photochemical and photoelectrochemical (PEC) water-splitting reaction. Cobalt oxide was produced via a hydrothermal process of cobalt nitrate hexahydrate and then annealed at different temperatures from 450 °C to 950 °C. The Co3O4 phase was produced during pre-annealing and annealing at 450 °C. The mixed phase of Co3O4 and CoO was produced during annealing at 550 °C and 650 °C, and pure CoO was produced during annealing from 750 °C to 950 °C. The Co3O4 phase produced the highest photocurrent density with a value of 1.15 mA cm?2 at a ?0.4 V potential bias vs. Ag/AgCl. This value two times higher than that reported by other researchers at the same potential bias. Furthermore, the highest rate of hydrogen collected by Co3O4 was ~272.6 μmol h?1 g?1 after 8 h photocatalytic process. The amount of collected hydrogen was stable until 12 h of the process. |
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| Keywords: | Hydrogen Cobalt oxide Photocatalyst PEC Temperature-dependent |
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