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Effect of Ni-B-C on Electrochemical Properties of La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20 Hydrogen Storage Alloy
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GuangxiSKeySLaboratorySofSElectrochemicalSandSMagneto-chemicalSFunctionalSMaterials,Guilin University of Technology

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    Abstract:

    Ni-B-C powder prepared by ball milling was introduced to improve the electrochemical properties of new AB3-type hydrogen storage alloy La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20. X-ray diffraction(XRD) and scanning electron microscope(SEM) were adopted to investigate the phase structure and Surface morphology of the alloy. It suggests that the alloy remains the original LaNi5 and La2Ni7 phases and some little particles appear on the surface of alloy. The addition of Ni-B-C improves the maximum discharge capacity and capacity retention rate. After adding a mass fraction of 10% Ni-B-C, the maximum discharge capacity increased from 346 mAh/g to 363 mAh/g, and the capacity retention rate after 50 cycles increases from 70% to 77%. The exchange current density I0 and the limiting current density IL reach 106 mA/g and 987 mA/g, respectively. Potentiodynamic polarization indicates the corrosion resistance of the electrodes is enhanced. The results show that the Ni-B-C powder can improve the comprehensive electrochemical properties of the hydrogen storage alloy.

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[Huang Hongxia, Yu Wenwan, Wang Cheng. Effect of Ni-B-C on Electrochemical Properties of La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20 Hydrogen Storage Alloy[J]. Rare Metal Materials and Engineering,2019,48(4):1325~1329.]
DOI:10.12442/j. issn.1002-185X.20170870

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History
  • Received:September 25,2017
  • Revised:October 30,2017
  • Adopted:November 08,2017
  • Online: May 13,2019
  • Published: