Catalytic activity of oxides and halides on hydrogen storage of MgH2 |
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| Affiliation: | 1. LRCS, 33 rue St. Leu, 80039 Amiens, France;2. GM Research and Development Center, Warren, MI, United States;1. Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, BARC, Mumbai, 400 085, India;3. Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;4. Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;2. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. Department of Chemistry and Department of Physiology and Function Genomics, Center for Research at the Bio/Nano Interface, Shands Cancer Center and UF Genetics Institute, University of Florida, Gainesville, FL 32611-7200, United States;1. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, China;3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;1. Nanoengineering Research Group, Department of Mechanical Engineering, University of Aveiro, 3810-193, Portugal;2. Department of Chemistry, Government College Kariyavattom, Thiruvananthapuram, Kerala 695581, India;3. Department of Complex Systems Science, Graduate School of Information Science, Nagoya University, Nagoya 464-8601, Japan |
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| Abstract: | Hydrogen sorption kinetics of ball milled MgH2 with and without chemical additives were studied. We observed kinetics and capacity improvement with increasing the number of sorption cycles that contributed to the micro/nano cracking of MgH2 particles, shown by XRD and SEM studies. In addition, to investigate the proposed specific role of O2?-based additives on the sorption kinetics of MgH2, we have undertaken a comparative study evaluating the performances of MgH2 containing the NbCl5, CaF2 or Nb2O5 additives. At 300 °C, addition of NbCl5 and CaF2 improved the sorption capacity to 5.2 and 5.6 wt% within 50 min, respectively, in comparison to the required 80 min in the case of Nb2O5. This suggests the importance of the chemical nature of the catalyst for hydrogen sorption in MgH2. In addition, the catalyst specific surface area was shown to be very critical. High surface area Nb2O5 (200 m2 g?1), prepared by novel precipitation method, exhibits an excellent catalytic activity and helped to desorb 4.5 wt% of hydrogen from MgH2 within 80 min at a temperature as low as 200 °C. |
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