| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2000: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Research Abstract |
In order to check the application of proton conductivity double oxides, SrCe_<0.95>M_<0.05>O_<3-δ>(M = Yb, Pr, Tm and Tb), to anode active materials in nickel-hydrogen batteries, hydrogen absorption-desorption characteristics of the proton conducting oxides were firstly investigated using an electrochemical technique in alkaline solutions. As a result, it was found that the oxide can electrochemically repeat hydrogen absorption and desorption like hydrogen storage alloys. The absorption-desorption performance changes depending on the kind of doped rare earth element. The highest absorption-desorption capacity is 1.11 hydrohen for one formula weight of the oxide in the case of SrCe_<0.95>Yb_<0.05>O_<3-δ>.
Subsequently, we attempted to improve activation properties of a hydrogen storage alloy, MmNi_<3.72>Co_<0.60>Mn_<0.45>Al_<0.32>, by mixing the proton conducting oxide. As a result, the oxide-alloy composite was found to enhance the activation performance of anode in Ni-metal hydride battery. The proton conducting oxide lying in the surface corrosion layer of alloy particle would play a role as a new path for hydrogen atoms to go into the alloy.
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