The electrical behaviour of platinum impregnated porous YSZ

摘要: Porous sintered cubic yttria-stabilised zirconia (YSZ) samples were impregnated with a platinum salt solution and subsequently reduced to Pt metal enhance the capacitance. Two impregnation methods applied: (1) immersion of porous YSZ in followed by reduction salt, (2) deposition at an electrode means electrolysis. The investigated using impedance spectroscopy (IS) ambient temperature 551 °C. room capacitance prepared first method was up four times larger than that YSZ, while maximum increase 20 observed electrolytically samples. Compared dense composites randomly dispersed phase, preparation samples—with comparable enhancement capacitance—resulted amount noble needed least one order magnitude. At temperatures above 400 °C, is oxygen ion conducting so double layer can be formed low frequencies metal/electrolyte interfaces. From measured double-layer capacitance, which amounts 2.6×102 F/m2 it determined specific electrode/electrolyte interfacial surface area range 80–300 m2/m2.