【摘 要】
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The influences of annealing treatment on the electrochemical and structural properties of La0.75 Mg0.25-Ni2.8 Co0.5 hydrogen storage alloy were investigated by
【机 构】
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Department of Materials Science and Engineering
论文部分内容阅读
The influences of annealing treatment on the electrochemical and structural properties of La0.75 Mg0.25-Ni2.8 Co0.5 hydrogen storage alloy were investigated by means of electrochemical studies and X-ray diffraction(XRD)analyses. The XRD results reveal that the peak width gets narrower with increasing annealing temperature, whichcan be ascribed to the structural change and more homogeneous composition after being annealed. Electrochemicalstudies show that the discharge capacity and the cycle stability of the alloy electrodes increase after being annealed.The maximum discharge capacity, exchange current density J0 and limiting current density JL of the as-cast alloy are 388mA @ h/g, 340. 5 mA/g and 3 068 mA/g, respectively, and they are increased to 400 mA @ h/g, 372. 1 mA/g and 3 399mA/g for the alloy annealed at 1 123 K for 8 h, respectively. Meanwhile, as the discharge current density is 1 250 mA/g,the high rate dischargeability(HRD) increases from 77.4 % for the as-cast alloy to 83.3 % for the alloy annealed at 1123 K.
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