The Pr1-xLaxMgNi4-yCoy alloys: Synthesis,structure and hydrogenation properties |
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| Affiliation: | 1. Campus Tecnológico e Nuclear, Instituto Superior Técnico/CFMC, Universidade de Lisboa, Estrada Nacional 10, km 139.7, 2695-066, Bobadela, LRS, Portugal;2. Department of Hydrogen Technologies and Hydride Materials Science, Karpenko Physico–Mechanical Institute of the NAS of Ukraine, Naukova str. 5, 79060, Lviv, Ukraine;1. Jan Dlugosz University of Czestochowa, Institute of Chemistry, Environmental Protection and Biotechnology, Armii Krajowej 13/15, 42-200, Czestochowa, Poland;2. Institute of Inorganic Chemistry, Ivan Franko Lviv University, Kyryla and Mefodia Street 6, 79005, Lviv, Ukraine;3. Silesian University, The Faculty of Earth Sciences, Bedzinska 60, 41-200, Sosnowiec, Poland;4. Jan Dlugosz University of Czestochowa, Institute of Physics, Armii Krajowej 13/15, 42-200, Czestochowa, Poland;1. Karpenko Physico-Mechanical Institute, Naukova 5, 79060, Lviv, Ukraine;2. Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. Stanisława Łojasiewicza 11, 30-348, Kraków, Poland;3. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Department of Solid State Physics, Ave. Mickiewicza 30, 30-059, Kraków, Poland;4. Institute of Low Temperature and Structure Research, Okólna 2, 50-422, Wrocław, Poland;1. Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5 Naukova St., 79060, Lviv, Ukraine;2. Ivan Franko National University of Lviv, Department of Inorganic Chemistry, 6 Kyryla i Mefodiya St., 79005, Lviv, Ukraine;3. Jan Długosz University of Częstochowa, Institute of Chemistry, Environmental Protection and Biotechnology, al. Armii Krajowej 13/15, 42200, Częstochowa, Poland;4. Université Paris-Est, ICMPE (UMR7182), CNRS, UPEC, F-94320, Thiais, France;1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Heavy Oil, College of Science, China University of Petroleum-Beijing, Beijing 102249, China;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;2. College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. Administrative office of Laboratory and Equipment, Yanshan University, Qinhuangdao 066004, PR China |
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| Abstract: | The influence of substitution Pr for La and Ni for Co on hydrogen storage properties of Pr1-xLaxMgNi4-yCoy (х = 0; 0.5, у = 0–3) alloys were studied. The existences of solid solutions have been found. It is shown that the synthesized alloys absorb hydrogen at room temperature and hydrogen pressure 0.1–10 bar. For some of the studied compounds, the formation of hydrides with cubic and orthorhombic structures was found. Hydrogen capacity for Pr1-xLaxMgNi4-yCoy alloys increases with Co content increasing and reaches 6.6 H/f.u. for PrMgNi2Co2. For electrochemical hydrogenation different trend was observed. With increasing of Co content discharge capacity slightly increases only to y = 0.5, and after y > 0.5, decreases. Highest discharge capacity is equal to 305 mА∙h/g for Pr0.5La0.5MgNi3.5Co0.5, and 268 mА∙h/g for PrMgNi3.5Co0.5 at current densities 50 mА/g and 200 mA/g, respectively. Influence of Co and number of activation cycles on HRD value of PrMgNi4-yCoy alloys was investigated. Additionally, obtained results of the electrochemical properties were compared with related compounds. |
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| Keywords: | Rare-earth alloys Magnesium phases Metal hydrides Hydrogen storage Metal hydride electrodes |
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