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Thermodynamics and kinetics of MgH2–nfTa2O5 composite for reversible hydrogen storage application

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Abstract

The thermodynamics and kinetics of hydrogen absorption–desorption of nfTa2O5–Mg–MgH2—composite (nf stands for nano-flakes) have been studied. The nfTa2O5–Mg composite could absorb hydrogen at room temperature (17 °C). The hydrogen desorption of nfTa2O5–MgH2 composite starts at 200 °C. The remarkably improved hydrogen absorption–desorption of catalyzed Mg–MgH2 could be attributed to the nano-engineered surface by nfTa2O5. The enthalpies of hydrogen absorption–desorption were found to be 80 ± 2, and 76 ± 3 kJ/mol respectively. The activation energy of hydrogen absorption was evaluated as 49 ± 5 kJ/mol which is same as the energy barrier for diffusion of hydrogen in Mg matrix. The apparent activation of hydrogen desorption of nfTa2O5–MgH2 was found to be 74 ± 7 kJ/mol. The nfTa2O5–MgH2 composite has shown cyclic stability up to fifty hydrogen absorption–desorption without significant changes in the kinetics and hydrogen storage capacity.

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Acknowledgements

The authors acknowledged the useful technical discussions with Professor N. Krishnamurthy, of Bhabha Atomic Research Centre and Professor D.K Ross of Salford University-Manchester, UK. The authors appreciate the keen interest and motivation shown by Professor G. K Dey, Director Materials Group during the investigations.

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Authors and Affiliations

  1. Materials Processing and Corrosion Engineering Division, BARC, Mumbai, 400 085, India

    Sanjay Kumar

  2. RA Institute of Technology, Vidya Nagri, Nerul, Navi Mumbai, 400709, India

    Gyanendra Prasad Tiwari

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  1. Sanjay Kumar
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  2. Gyanendra Prasad Tiwari
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Correspondence to Sanjay Kumar.

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Kumar, S., Tiwari, G.P. Thermodynamics and kinetics of MgH2–nfTa2O5 composite for reversible hydrogen storage application. J Mater Sci 52, 6962–6968 (2017). https://doi.org/10.1007/s10853-017-0928-6

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  • DOI: https://doi.org/10.1007/s10853-017-0928-6

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