Electrophoretic Deposition Mechanism of YSZ/n-Propanol Suspension

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Abstract
The technological feasibility of utilizing electrophoretic deposition (EPD) has been studied. The EPD mechanism of 8 mol % yttria-stabilized zirconia (8YSZ) powder as the electrolyte material of solid oxide fuel cells (SOFCs) in n-propanol has been investigated from the viewpoint of dc and ac electrochemical experiments under applied constant voltages. A fine particle suspension can be prepared by ultrasonic vibration and is stable, and the dispersed particle becomes charged. The charged particle acts by migration of the electric charge when a dc potential is applied. The charge-transfer quantity from a particle to the deposition layer is constant with the applied EPD. The initial deposit layer, which has a high resistance, is immediately formed. This formation is accompanied by a decreasing potential gradient in the EPD bath, therefore, the deposition rate decreased. However, the bulk EPD bath characteristic itself does not change with the applied EPD. The amount of the deposit and velocity of the particles have a mutual relation and the EPD model is considered. The present investigation’s objective is the technological feasibility of applying the EPD technique. © 2004 The Electrochemical Society. All rights reserved.