Catalytic effect of bis (cyclopentadienyl) nickel II on the improvement of the hydrogenation-dehydrogenation of Mg-MgH2 system |
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| Authors: | Sanjay Kumar Ankur Jain Hiroki Miyaoka Takayuki Ichikawa Yoshitsugu Kojima |
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| Affiliation: | 1. Natural Science Centre for Basic Research and Development, Hiroshima University, 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, BARC Mumbai, 400085, India;3. Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama 739-8527, Japan |
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| Abstract: | Bis(cyclopentadienyl) nickel II is one of the best precursors of nickel catalyst which remarkably improved the hydrogen absorption-desorption of Mg–MgH2 system. The X-ray photoelectron spectroscopy (XPS) and Furrier Transformed Infrared Spectroscopy (FTIR) analyses revealed that bis (cyclopentadienyl) nickel II decomposed into metallic nickel during ball milling with MgH2. The nickel thus formed has homogeneously doped over the Mg - MgH2 surface. The Ni-doped Mg-MgH2 have shown the excellent catalytic effect on hydrogen absorption-desorption. The catalyzed MgH2 could desorb hydrogen below 225 °C (Tonset) under Ar flow, and absorb hydrogen at 50 °C under 1.5 MPa H2 pressure. The hydrogen absorption-desorption temperatures are remarkably decreased as compared to the uncatalyzed Mg-MgH2 system under the identical experimental conditions. |
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| Keywords: | Activation energy Enthalpy Catalysis Nickel catalyst Thermal analysis |
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