ZrO_2CaO-溶融銀, 鉛, 鉄および固体白金-溶融 PbO-GeO_2, PbO-SiO_2, Na_2O-SiO_2 界面における直流分極現象について

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The mechanism of charge transfer process on metal-ionic conductor oxide interfaces was studied at elevated temperatures in various oxygen pressure range. (1) Following cells were made with lime stabilized zirconia as solid electrolyte ; Ni. NiO or Mo. MoO_2/ZrO_2 CaO/molten silver, lead or iron. When a current was supplied galvanostatically to this cell, the oxygen concentration overpotential was observed on the zirconia-molten metal interface. A linear relationship between exp(2F/(RT)η) and √<t> was obtained for every cell. This indicates that the diffusion of dissolved oxygen in molten metal is the rate controlling step of charge transfer process on the interface.(2) A potential was applied potentiostatically between two of three platinum rods which were dipped into PbO-GeO_2, PbO-SiO_2 and Na_2O-SiO_2 melts. The supplied current across the examining platinum-molten oxide interface decreased with time. Plot of current i against 1/√<t> exhibited a linear relationship for every cell examined. The slope of the line increased with PO<O_2>, with temperature, and decreased with the increase of SiO_2 content in PbO-SiO_2 system. These results were interpreted as follows ; The applied overpotential is the oxygen concentration overpotential and the diffusion of di-atomic oxygen dissolved in molten oxide is the rate controlling step of the charge transfer process on the solid platinum-molten oxide interface.
社団法人日本鉄鋼協会の論文
1973-02-01

ZrO_2CaO-溶融銀, 鉛, 鉄および固体白金-溶融 PbO-GeO_2, PbO-SiO_2, Na_2O-SiO_2 界面における直流分極現象について

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