Title of article :
Study on the microstructure and the electrochemical properties of Ml0.7Mg0.2Ni2.8Co0.6 hydrogen storage alloy
Author/Authors :
Tang، نويسنده , , Rui and Liu، نويسنده , , Liqin and Liu، نويسنده , , Yongning and Yu، نويسنده , , Guang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Abstract :
A hydrogen storage electrode alloy Ml0.7Mg0.2Ni2.8Co0.6 was obtained by inductive melting of La-rich mischmetal and some other alloy elements such as Mg, Ni and Co. XRD, SEM and EDX analyses indicated that the microstructure of the prepared alloy was composed of LaNi5 phase as matrix and La5Mg2Ni21 as secondary phase. The highest hydrogen absorption concentration is 1.58 wt% at 302 K through pressure–concentration–temperature (P−C−T) curves measurement. The discharge capacity reaches 380 mAh/g, which is 20% higher than that of traditional LaNi5 type alloys. However, the cycle stability needs to be improved further for commercialization. The formation of La5Mg2Ni21 secondary phase is the key factor for the high capacity of the alloy.
Keywords :
Discharge capacity , Hydrogen storage alloy , microstructure , P–C–T curve
Journal title :
International Journal of Hydrogen Energy
Journal title :
International Journal of Hydrogen Energy