Kinetic improvement of H2 absorption and desorption properties in Mg/MgH2 by using niobium ethoxide as additive |
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| Affiliation: | 1. Instituto Balseiro, Universidad Nacional de Cuyo, Av. Bustillo 9500, S.C. de Bariloche, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CNEA, Centro Atómico Bariloche, Av. Bustillo 9500, S.C. de Bariloche, Argentina;3. Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Quintral 1250, S.C. de Bariloche, Argentina;1. School of Aeronautics, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;3. Unmanned Systems Research Institute, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;1. Tokyo University of Agriculture and Technology, Naka-cho 2-24-16, Koganei-shi, Tokyo, Japan;2. School of Engineering, The University of Tokyo, Hongo, Tokyo, 113-8656, Japan;3. Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8505, Japan;1. Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran;2. Mechanical Engineering Department, University of Birjand, Birjand, Iran;1. Department of Mechanical Engineering, Yuan Ze University, Chungli, 32003, Taiwan, ROC;2. Graduate School of Renewable Energy and Engineering, Yuan Ze University, Chungli, 32003, Taiwan, ROC;3. Fuel Cell Center, Yuan Ze University, Chungli, 32003, Taiwan, ROC;1. Department of Materials Physics, Eötvös University, P.O.B. 32, H-1518, Budapest, Hungary;2. Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164, Sofia, Bulgaria;3. Center of Energy Research, Hungarian Academy of Sciences, H-1121, Budapest, Hungary;4. Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, A-1090, Vienna, Austria;1. Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France;2. LCC-CNRS, Université de Toulouse, CNRS, UPS, 205 Route de Narbonne, BP 44099, F-31077, Toulouse Cedex 4, France |
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| Abstract: | The hydrogen absorption and desorption properties of a MgH2 – 1 mol.% Nb(V) ethoxide mixture are reported. The material was prepared by hand mixing the additive with previously ball-milled MgH2. Nb ethoxide reacts with MgH2 during heating, releasing C2H6 and H2, and producing MgO and Nb or Nb hydride. Hydriding and dehydriding are greatly enhanced by the use of the alkoxide. At 250 °C the material with Nb takes up 1.8 wt% in 30 s compared with 0.1 wt% of pure Mg, and releases 4.2 wt% in 30 min, whereas MgH2 without Nb does not appreciably desorb hydrogen. The absorption and desorption activation energies are reduced from 153 kJ/mol H2 to 94 kJ/mol H2, and from 176 kJ/mol H2 to 75 kJ/mol H2, respectively. The hydrogen sorption properties remain stable after 10 cycles at 300 °C. The kinetic improvement is attributed to the fine distribution of amorphous/nanometric NbHx achieved by the dispersion of the liquid additive. |
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| Keywords: | Hydrogen storage Niobium alkoxide Magnesium hydride Hydrogen sorption kinetics |
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