XPS study on the vanadocene-magnesium system to understand the hydrogen sorption reaction mechanism under room temperature |
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| Affiliation: | 1. Natural Science Centre for Basic Research and Development, Hiroshima University, 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, Materials Group, BARC, Mumbai, 400 085, India;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China;2. Department of Metallurgical Engineering, The University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT, 84112, USA;1. State Key Laboratory of Silicon Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, China;2. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, School of Physical Science and Technology, Guangxi University, Nanning, 530004, PR China;1. Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;2. Institute for Sustainable Sciences and Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;3. Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China;2. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, NSW, 2522, Australia;3. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou, 310013, PR China |
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| Abstract: | Magnesium surface dope with vanadium has been considered as one of the best material for the hydrogen storage application. Optimization of vanadium concentration doping is important to retain the hydrogen storage capacity above 6 wt %. Vanadocene, bis(η5-cyclopentadienyl) vanadium, with the formula V(C5H5)2, commonly abbreviated as Cp2V is considered as the best precursor for the vanadium to dope the optimized concentration of vanadium over the Mg surface. The vanadium doping over the magnesium has been studied by X-ray photoelectron spectroscopy (XPS) in details. The vanadium doped Mg has been found to be hydrogenated even at 0 °C under nominal hydrogen pressure (above plateau pressure). Besides, the dehydrogenation temperature was also found to be below 200 °C which is remarkable less as compared to pure magnesium, and comparable to the best catalysts for Mg-MgH2 system reported till date. |
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| Keywords: | Thermal analysis XPS Kinetics Enthalpy Activation energy Catalysis |
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