Microstructural evolution and hydrogen storage properties of Mg1-xNbx(x=0.17~0.76) alloy films via Co-Sputtering |
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| Affiliation: | 1. Shibaura Institute of Technology, Department of Engineering Science and Mechanics, 3-7-5 Toyosu, Koto-ku, 135-8548 Tokyo, Japan;2. Shibaura Institute of Technology, SIT Research Laboratories, 3-7-5 Toyosu, Koto-ku, 135-8548 Tokyo, Japan;3. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland;1. MIRE-Group, Laboratorio de Física de Materiales de Interés Energético, Dpto. de Física de Materiales, Facultad de Ciencias, UAM, 28049 Madrid, Spain;2. CRISMAT, UCBN, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France;3. IMM – Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, E-28760 Madrid, Spain;4. Centro de Microanálisis de Materiales (CMAM), C/Faraday 3, UAM, 28049 Madrid, Spain;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, PR China;2. School of Materials Science and Engineering, Henan Polytechnic University, Zuojiao, 454000, PR China;1. Dept. of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA;2. Dept. of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA;3. Dept. of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA;4. Dept. of Electrical Engineering, Texas A&M University, College Station, TX 77843-3128, USA;1. School of Materials Sciences and Engineering, South China University of Technology, Guangzhou, 510640, China;2. Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640, China;1. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan;2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;3. Department of Hydrogen Energy Systems, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan;4. Beijing National Laboratory for Molecular Sciences (BNLMS), The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
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| Abstract: | A series of Mg1-xNbx (x = 0.17–0.76) alloy films were prepared by means of magnetron co-sputtering in this work, on the purpose of obtaining better hydrogen storage materials with controllable component and structure. Mg(Nb) solid solution (Mg0.83Nb0.17 and Mg0.76Nb0.24 film), BCC-(Mg1-xNbx) structure (Mg0.70Nb0.30 and Mg0.60Nb0.40 film), and Nb(Mg) solid solution respectively (Mg0.38Nb0.62 and Mg0.24Nb0.76 film) formed in the MgxNb1-x alloy films with the increases of Nb contents. It only took 3 min for BCC-Mg0.60Nb0.40 to absorb 2.3 wt% hydrogen at 473 K and took only 30 min to desorb 1.2 wt% hydrogen at 523 K. Moreover, the BCC structure maintained after hydrogenation or dehydrogenation, which promised good cyclic stability. The hydrogen storage capacities of Mg1-xNbx alloy films were decreased with the increases of Nb contents. Mg0.83Nb0.17 can absorb most hydrogen of 3.8 wt% and Mg0.24Nb0.76 absorbs least hydrogen of 1.0 wt%. The Nb not only played a role of catalyst but also cooperated with Mg to build the BCC-(Mg,Nb) structure. The former provided intergranular path for the hydrogen atoms to diffuse faster; the latter provided more and larger lattice interstices for hydrogen atoms to diffuse in grain more easily. |
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| Keywords: | Hydrogen storage Magnetron co-sputtering Alloy films BCC Mg–Nb |
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