ХИМИЯ UDK 544.6 OF ACTIVE LAYER ON LaNi4.3–x Uong Van Vy1 , Do Tra Huong2 1 3 NANO DIMENSION AND COBALT RATIO EFFECTS Cox Mn0.4 Al0.3 , Le Xuan Que1 Thai Nguyen City University of Education, Thai Nguyen, Vietnam INGOT ELECTRODES , Nguyen Anh Tien3 Institute for Tropical Technology, Vietnamese Academy of Science and Technology, Hanoi, Vietnam 2 Ho Chi Minh City University of Pedagogy, Ho Chi Minh City, Vietnam Поступила в редакцию 20.04.2011 г. ness of layers depend on Co ratio in the alloys. <...> With x Co ratio in the range from 0.5 to 0.75, the highest surface capacity, λa ) and of performance layer (dp = 0.4 nm, has been considered, corresponding to two atomic layers. <...> The performance thickness of ingot electrodes in the range from 0.8 to 1.5 µm, the highest about 2 µm was found in sample with x = 0.75. <...> Keywords: rare earth compounds, hydrogen storage materials, ingot electrodes, active layer. <...> INTRODUCTION In the recent years hydride materials have become increasingly important because of their widespread application in hydrogen storage materials and batteries. <...> The LaNi5 -typed alloys have absorbtion ability large quantities of hydrogen in temperature and pressure ambient. <...> The material has recently proven to be very attractive as a negative electrode material for the rechargeable nickel-metal hydride (Ni-MH) batteries [1, 2]. they exhibit low hysteresis, tolerant to gaseous impurities and are easily hydrogenated in the initial cycles after manufacture. <...> Properties of the materials can be modifi ed substantially by alloy composition, to obtain the desired storage characteristics, e.g. proper capacity at a favorable hydrogen pressure [2—4]. <...> Cox Mn0.4 Al0.3 materials had EXPERIMENT PROCEDURES Intermetallic compounds with composition LaNi4.3–xCoxMn0.4Al0.3, x = 0, 0.25, 0.5, 0.75, and 1, were © Uong Van Vy, Do Tra Huong, Le Xuan Que, Nguyen Anh Tien, 2012 alloy can absorb up to 5.5 H/f.u. at room -type materials is fabricated in an arc melting furnace from La, Ni, Co, Mn <...>