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    • Keywords

       

      LaNi4.7Al0.3 hydrogen storage alloy; CO impurities gas; hydrogen purification; absorption/desorption kinetics.

    • Abstract

       

      LaNi4.7Al0.3 alloy was prepared by vacuum induction melting in high purity helium atmosphere, and the ingot was pulverized into 200–400 mesh powder after annealing. X-ray diffraction (XRD) and scanning electron microscopies (SEM) were utilized to study the alloy morphology and phase structure. X-ray photoelectron spectroscopy (XPS) was used for surface analysis. The poisoned alloy was tested at 30 °C in the mixture gas by thermogravimetric and differential thermal analyses (TG + DTA). The hydrogen storage properties were studied by the pressure–composition–temperature test. The activated sample was completely deactivated after only 3 hydriding/dehydriding cycles in hydrogen containing 300 ppm CO at 30 °C, but hydrogen storage capacity did not degrade when tested at 80 °C. Additionally, two different steps appeared in the absorption processes. Combined with XRD, XPS and TG + DTA results, an explanation for this phenomenon is given.

    • Author Affiliations

       

      Qi Wan1 Ping Li1 Yunlong Li1 Fuqiang Zhai1 Weina Zhang1 Liqun Cui1 Alex A Volinsky2 Xuanhui Qu1 3

      1. Institute for Advanced Materials and Technology, University of Science and Technology, Beijing, Beijing 100083, China
      2. Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA
      3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing, Beijing 100083, China
    • Dates

       
  • Bulletin of Materials Science | News

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