Cobalt oxide nanocomposites and their electrocatalytic behavior for oxygen evolution reaction |
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| Affiliation: | 1. Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, 21589, P.O. Box 80203, Saudi Arabia;2. Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia;1. Nanotechnology & Catalysis Research Centre, University of Malaya, Malaysia;2. Department of Chemistry, Faculty of Science and Arts and Promising Centre for Sensors and Electronic Devices, Najran University, Najran 11001, Saudi Arabia;3. Applied Medical Science Dept., Community College, King Saud University, Riyadh, Saudi Arabia;4. Department of Biomedical Engineering, Faculty of Engineering, Helwan University, Egypt;5. Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia;6. Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia;7. Department of Electrical Engineering, Faculty of Energy Engineering, Aswan University, Aswan 81528, Egypt;8. New and Renewable Energy Materials Development Center (NewREC), Chonbuk National University, Jeonbuk 56332, Republic of Korea;9. Higher Institution Centre of Excellence (HICoE), UM Power Energy Dedicated Advanced Centre (UMPEDAC), 59990 Kuala Lumpur, Malaysia;1. Key Laboratory of Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi''an 710062, Shaanxi Province, China;2. Key Laboratory of Colloid and Interface Chemistry of State Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;1. Sustainable Electronic Materials Group, Department of Mining, Metallurgical, and Materials Engineering, University of the Philippines Diliman, Diliman, 1101, Quezon City, Philippines;2. School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, United Kingdom;1. Shenyang University of Chemical Technology, Shenyang 110142, China;2. Faculty of Environmental and Municipal Engineering, Henan University of Urban Construction, Pingdingshan 467036, China;3. Inner Mongolia University of Technology, Hohhot 010051, China;1. Key Laboratory of Chemical Reaction Engineering of Shaanxi Province; College of Chemistry & Chemical Engineering, Yan''an University, Yan''an 716000, PR China;2. School of Chemistry, Faculty of Science, the University of New South Wales, High Street, Sydney 2052, Australia;3. College of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, PR China |
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| Abstract: | In this work, we have described the simple preparation method of cobalt oxide nanocomposites where cobalt oxide nanoparticles were grown on the surface of carbon nanotube, graphene oxide and graphene (Co3O4@CNT, Co3O4@GO, Co3O4@G). The as-grown Co3O4@CNT, Co3O4@GO, Co3O4@G were investigated for H2O oxidation. The nanoparticles displayed high activity toward oxygen evolution. Further, the stability of the catalysts were tested in alkaline solution, which exhibited good stability. Among all nanoparticles, Co3O4@G exhibited higher current density at lower overpotential and also exhibited lower Tafel slope (157.1 mV dec?1) as compared to Co3O4@CNT and Co3O4@GO. The Co3O4@G delivered a current density of 10 mAcm?2 at 0.8 V (overpotential 535 V versus Ag/AgCl) in 0.1 M KOH solution, which is superior than many electrocatalysts reported for oxygen evolution so far. The good electrocatalytic performance might be due to the structural features of Co3O4@G, which cause enhancement of oxygen evolution activity. |
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| Keywords: | Cobalt oxide Graphene Nanocomposite Electrocatalyst Oxygen evaluation reaction Linear sweep voltammetry |
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