Improved Dehydrogenation and Rehydrogenation Properties of LiBH₄ by Nanosized Ni Addition (Special Issue on Advanced Materials for Hydrogen Energy Applications(2)) Improved Dehydrogenation and Rehydrogenation Properties of LiBH<sub>4</sub> by Nanosized Ni Addition

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Author(s)

    • Li Hai-Wen Li Hai-Wen
    • International Research Center for Hydrogen Energy, Kyushu University|International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University
    • Akiba Etsuo [他] Akiba Etsuo
    • International Research Center for Hydrogen Energy, Kyushu University|International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University|Department of Mechanical Engineering, Kyushu University
    • Orimo Shin-ichi
    • Institute for Materials Research, Tohoku University|WPI-Advanced Institute for Materials Research, Tohoku University

Abstract

The complex hydride LiBH<sub>4</sub>, with a hydrogen density of 18.5 mass%, has been attracting significant interests for hydrogen storage, while suffers from its high dehydrogenation and rehydrogenation temperature. In this work, we systematically investigated the improvement effects of nanosized Ni on the dehydrogenation and rehydrogenation reactions of LiBH<sub>4</sub> using thermogravimetry, quadrupole mass spectrometry and pressure-composition-isotherm analyses. Nanosized Ni was homogeneously dispersed on the surface of LiBH<sub>4</sub> after ball milling. The dehydrogenation peak temperature of LiBH<sub>4</sub> was reduced from 743 to 696 K with addition of 25 mass% Ni. First, LiBH<sub>4</sub> tended to react with Ni to form Ni<sub>4</sub>B<sub>3</sub>, which suggests the thermodynamic destabilization effect of Ni. Then, the <i>in-situ</i> formed Ni<sub>4</sub>B<sub>3</sub> was suggested to play a catalytic role on the dehydrogenation of the unreacted LiBH<sub>4</sub>. Moreover, the rehydrogenation content of LiBH<sub>4</sub> was improved from 4.3 to 10.8 mass% by addition of 25 mass% Ni, suggesting the significant improvement effect of Ni<sub>4</sub>B<sub>3</sub> on the rehydrogenation.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 55(8), 1134-1137, 2014

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130004825214
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • ISSN
    1345-9678
  • NDL Article ID
    025616863
  • NDL Call No.
    Z53-J286
  • Data Source
    NDL  J-STAGE 
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