W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and ele...W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and electrochemical characteristics of LaNi3.70Co0.2-xMno.3oA10.15Cuo.65（W0.42Fe0.58）x （x=0.20） hydrogen storage alloys were characterized. X-ray diffraction patterns and backscattered electron images indicated that the pristine alloy was LaNi5 phase, while the alloys containing W0.a2Fe0.58 were made of LaNi5 matrix phase and W phase. The relatived abundance of W phase increased with the increase in x value. Lattice parameters a, c, c/a and cell volume V of LaNi5 phase increased with increasing x value. Activation property of the alloy electrodes was improved by substituting Co by Wo.42Fe0.58. As x increased from 0 to 0.20, maximum discharge capacity of alloy electrodes decreased from 335.4 （x=0） to 320.7 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA increased from 59.8% （x=0） to 76.8% （x=0.10）, and then decreased to 64.7% （x=0.20）. The cycling capacity retention rate at the 100th cycle decreased from 80.4% （x=0） to 55.8% （x=0.20）, which should be ascribed to the degradation of the corrosion resistance and electrochemical kinetics of alloy electrodes.展开更多
基金supported by the National Natural Science Foundation of China(51471065,U1304522)Program for New Century Excellent Talents in University(NCET-11-0943)+2 种基金Plan for Scientific Innovation Talent of Henan Province(144100510009)Fundamental Research Funds for the Universities of Henan Province(NSFRF140601)Foundation for University Key Teacher in the University of Henan Province(2011GGJS-052)
文摘W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and electrochemical characteristics of LaNi3.70Co0.2-xMno.3oA10.15Cuo.65（W0.42Fe0.58）x （x=0.20） hydrogen storage alloys were characterized. X-ray diffraction patterns and backscattered electron images indicated that the pristine alloy was LaNi5 phase, while the alloys containing W0.a2Fe0.58 were made of LaNi5 matrix phase and W phase. The relatived abundance of W phase increased with the increase in x value. Lattice parameters a, c, c/a and cell volume V of LaNi5 phase increased with increasing x value. Activation property of the alloy electrodes was improved by substituting Co by Wo.42Fe0.58. As x increased from 0 to 0.20, maximum discharge capacity of alloy electrodes decreased from 335.4 （x=0） to 320.7 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA increased from 59.8% （x=0） to 76.8% （x=0.10）, and then decreased to 64.7% （x=0.20）. The cycling capacity retention rate at the 100th cycle decreased from 80.4% （x=0） to 55.8% （x=0.20）, which should be ascribed to the degradation of the corrosion resistance and electrochemical kinetics of alloy electrodes.
