【摘 要】
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The Mg90Ce5RE5 (RE =La,Ce,Nd) alloys were prepared by a vacuum induction furnace and their microstructure,phase transformation,thermodynamics and kinetics prope
【机 构】
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Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,
论文部分内容阅读
The Mg90Ce5RE5 (RE =La,Ce,Nd) alloys were prepared by a vacuum induction furnace and their microstructure,phase transformation,thermodynamics and kinetics property were systematically stud-ied by XRD,SEM,TEM,and PCT characterization methods.The result shows that the activated alloys are composed of Mg/MgH2 and corresponding REH2+x with nanoscale.The REH2+x grain with Ce and La or Nd functional group have lower nucleation potential barriers than CeH2+x grains as the nucleation loca-tion,thus improve the hydrogen absorption kinetics of these alloys among which the Mg90Ce5Nds alloy can absorb 90％ of the hydrogen within 2 min at 320 ℃.In addition,the Mg90Ce10 alloy has the lowest activation energy with 103.2 kJ mol-1 and the fastest desorption kinetics,which can release 5 wt％ of the hydrogen within 20 min at 320 ℃.This is a correlation with grain size and the in-suit formed CeH2.73/CeO2 interface.Moreover,the co-doping Ce and La or Nd can effectively disorganize the thermodynamic sta-bility of Mg-based hydrogen storage alloys to a certain degree,but the dehydrogenation kinetics of that still is restricted by the recombination energy of hydrogen ions on the surface.
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