DETERMINATION OF TRANSPORT AND ELECTROCHEMICAL KINETIC-PARAMETERS OF BARE AND COPPER-COATED LANI4.27SN0.24 ELECTRODES IN ALKALINE-SOLUTION

Electrochemical properties of bare and copper-coated LaNi4.27Sn0.24 el ectrodes were investigated in alkaline solution. The exchange current density. polarization resistance, and equilibrium potential were deter mined as functions of the state of charge in the electrodes. The symme try factors for bare and copper-coated electrodes were estimated to be 0.53 and 0.52, respectively. By using a constant current discharge te chnique, the hydrogen diffusion coefficient in bare and coated LaNi4.2 7Sn0.24 was estimated to be 6.75 X 10(-11) cm(2)/s.