ELECTROCHEMICAL AND CORROSION PROPERTIES OF YNI(2.5)M(0.5) (M=NI, AL,FE, CR, CU, CO, MN) HYDRIDE-FORMING ALLOYS

Hydrogen sorption by electrode materials based on YNi(2.5)M(0.5) (M = Ni, Al, Fe, Cr, Co, Cu, Mn) intermetallic compounds (IMC) with Cu and PTFE binders is studied in 1 M NaOH solution. The obtained reversible electrochemical capacities correspond to YNi(2.5)M(0.5)H(1.3-1.7) hydr ides which are stable at room temperature and atmospheric pressure. Th e application of Cu binder allows one to more completely use the mater ial sorption capacity and promotes both extraction and sorption of hyd rogen by IMC. The rate of yttrium anodic dissolution from IMC is found to be at least one order of magnitude lower than that for individual metal, whereas nickel is practically insoluble.