Influence of the synthesis route on hydrogen sorption properties of La2MgNi7Co2 alloy |
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| Affiliation: | 1. Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology, Al. Armii Krajowej 19, 42-200, Czestochowa, Poland;2. Trzebiatowski Institute of Low Temperatures and Structure Research PAS, Okolna Str. 2 P.O. Box 1410, 50-950, Wrocław, Poland;1. Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana Champaign, Urbana, IL, 61801, United States;2. Department of Mechanical Engineering, Jordan University of Science and Technology, P.O.Box 3030, Irbid, 22110, Jordan;1. College of Chemical Engineering, Huaqiao University, Xiamen, 361021, PR China;2. NTNU Nanomechanical Lab, Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway;3. College of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, PR China;1. School of Materials Science and Engineering, Hebei University of Technology, And Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Tianjin, 300130, China;2. Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, And School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, Shandong, China;3. Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, DK, 8000, Denmark;1. Instituto de Catálisis y Petroleoquímica, CSIC, C/ Marie Curie, 2, 28049 Madrid, Spain;2. Catalonia Institute for Energy Research - IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain;3. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain;4. Institute of Energy Technologies, Department of Chemical Engineering, Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, 08019 Barcelona, Spain;5. ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain |
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| Abstract: | Solid-gas and electrochemical hydrogenation properties of La2MgNi7Co2 alloy are presented. Hydrogen concentration of 1.90 wt% at hydrogen pressure of 10 bar has been reached. The influence of the fabrication technology of La2MgNi7Co2 alloy on electrochemical performance of the hydride electrode were studied and discussed. To evaluate electrochemical characteristics of La2MgNi7Co2 electrodes including discharge capacity, self-discharge and kinetic parameters the galvanostatic charge/discharge technique was used. The studied samples were a multiphase. The presence of Mg-enriched phases (La2MgOx, (La, Mg)Ni3 and LaMgNi4) raises hydrogen capacity and makes an electrode less susceptible for the self-discharge effect. On the other hand Mg-presence in MH electrodes lowers the hydrogen desorption rate. It was found that, the dominant abundance of the LaNi5 phase in the tested materials has a positive effect on the kinetic parameters of the hydride electrode. |
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| Keywords: | Hydrogen storage alloy Ingot metallurgy Phase structure Electrochemical characterization |
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