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Study on the Improvement of Hydrogen Absorb/desorb Properties and Anti-disproportionation performance of Zr1-XCoNbx (x = 0-0.2) alloys
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1.Science and Technology on Surface Physics and Chemistry Laboratory;2.Institute of Materials,China Academy of Engineering Physics

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National Nature Science Foundation of China

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    Abstract:

    Zr1-xCoNbx (x = 0, 0.05, 0.1, 0.15, 0.2) alloys were prepared via vacuum arc-melting method. The effects of substituting Zr with Nb on the structure, hydrogen absorb/desorb properties and anti-disproportionation performance of the afore-mentioned alloys were systematically investigated. The results showed that Zr1-xCoNbx (x = 0-0.2) alloys exhibited ZrCo and ZrCo2 phases, and their corresponding hydrides consisted of ZrCoH3 and ZrCo2 phase. As the Nb content was increased, the activation time decreased significantly from 6790 s for ZrCo to 380 s for Zr0.8CoNb0.2. The activation energy for hydrogenation decreased from 44.88 kJ mol-1 H2 for ZrCo to 32.73 kJ mol-1 H2 for Zr0.8CoNb0.2 alloy. DSC measurement results showed that the desorption temperature decreased from 597.15 K for ZrCo to 541.36 K for Zr0.8CoNb0.2 and the activation energy for dehydrogenation decreased from 100.55 kJ mol-1 H2 for ZrCo to 84.58 kJ mol-1 H2 for Zr0.8CoNb0.2 alloy, which was beneficial to the anti-disproportionation properties. Additionally, the extents of disproportionation of alloys after disproportionated at 798 K for 10 h decreased from 83.68% for ZrCo to 8.71% for Zr0.8CoNb0.2. The positive effect of Nb substitution on improving the anti-disproportionation propertis of ZrCo alloys was attributed to the reduction of hydrogen atoms in 8f2 and 8e sites, which decreases the driving force of the disproportionation reaction.

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[LUO Linling, YE Xiaoqiu, ZHANG Guanghui, SANG Ge. Study on the Improvement of Hydrogen Absorb/desorb Properties and Anti-disproportionation performance of Zr1-XCoNbx (x = 0-0.2) alloys[J]. Rare Metal Materials and Engineering,2021,50(1):172~178.]
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History
  • Received:January 19,2020
  • Revised:May 05,2020
  • Adopted:May 08,2020
  • Online: February 05,2021
  • Published: