Diffusion and segregation of iron in the electrode system Pt(O2)/YSZ
Abstract
The system Pt(O2)/YSZ (YSZ = yttrium stabilized zirconia) is important for the general microscopic understanding of electrode processes in solid state electrochemistry. In spite of its simplicity many questions are unanswered still today after several decades of research. It is now generally accepted that the oxygen exchange takes place at the tpb (tpb = three phase boundary) gas/platinum/YSZ or in an active region in its close vicinity (Fig. 1). Fig. 1 The oxygen exchange processes at the tpb during electrochemical polarization. It is also known that impurities can strongly influence the electrode kinetics. For example, silicon can form a blocking layer of SiO2 which degrades the electrode performance [1]. One main impurity of commercial platinum catalysts is iron (Fe). To analyse the influence of iron in the electrode system, PLD (PLD = pulsed laser deposition) was used to prepare thin, well defined multilayers of platinum and iron on YSZ(111) single crystals with an overall thickness of about 1 µm. With those samples, diffusion und polarization experiments were made in air and vacuum. Diffusion Fundamentals 12 (2010) 59 © J. Janek, H. PöpkePöpke et al. Diffusion and segregation of iron in the …
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