Hydrogen uptake of manganese oxide-multiwalled carbon nanotube composites |
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| Affiliation: | 1. Department of Physics, The Institute of Science, FORT, Mumbai, 400 032, Maharashtra, India;2. Center for Automation and Technology (TEMA), Department of Mechanical Engineering, University of Averio, Portugal;3. Dept. of Physics, Govt. Vidarbha Institute of Science & Humanities, Amravati, 444604, India;1. School of Physics, Madurai Kamaraj University, Madurai, 625021, India;2. Department of Physics, Pasumpon Muthuramalinga Thevar College, Madurai, 625532, India;3. New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan;4. Department of Physics & Nanotechnology, SRM University, Kattankulathur, 603203, India;5. SRM Research Institute, SRM University, Kattankulathur, 603203, India;6. Materials Science Division, Inter University Accelerator Centre, New Delhi, 110067, India;1. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;2. Young Researcher and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran;1. Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong, 250022, China;2. College of Science, Zhongyuan University of Technology, Zhengzhou, Henan, 450007, China;3. College of Science, Henan University of Technology, Zhengzhou, 450001, China;1. Micro&Nano Material Research Institute, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China;2. College of Science, Harbin Engineering University, Harbin, Heilongjiang 150001, PR China;3. Beijing National Laboratory for Molecular Sciences, Peking University, PR China |
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| Abstract: | Hydrogen uptake of pristine multi-walled carbon nanotubes is increased more than three-fold at 298 K and hydrogen pressure of 4.0 MPa, upon addition of hydrogen spillover catalyst manganese oxide, from 0.26 to 0.94 wt%. Simple and convenient in situ reduction method is used to prepare Mn-oxide/MWCNTs composite. XRD, FESEM, and TEM demonstrates nanostructural characterization of pristine MWCNTs and composite. TGA analysis of Mn-oxide/MWCNTs composites showed a single monotonous fall related to MWCNTs gasification. Enhancement of hydrogen storage capacity of composite is attributed to spillover mechanism owing to decoration of Mn-oxide nanoparticles on outer surface of MWCNTs. Hydrogen uptake follows monotonous dependence on hydrogen pressure. Oxide-MWCNTs composite not only shows high hydrogen storage capacity as compared to pristine, but also exhibit significant cyclic stability upon successive adsorption–desorption cycles. |
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| Keywords: | Hydrogen storage Spillover mechanism Multi-walled carbon nanotubes In situ reduction Manganese oxide Purification |
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