Electronic and Structural Properties of Solid Oxide Fuel Cells Compounds In-Operando Conditions

NAPOLITANO F.; BAQUE L.; ARCE M.D.; BASBUS J.F.; MOGNI L.V; MANSILLA Y; TROIANI H.; SERQUIS A,

Congreso; XXIII Simposio Latinoamericano de Física del Estado Sólido (SLAFES), Bariloche, 10-13 Abril, 2018.; 2018

The development of intermediate temperature solid Oxide Fuel Cells (IT-SOFC) as high ecient energyconversion systems requires the optimization of its components: cathode, anode and electrolyte. The performanceof IT-SOFC mainly depend on the structural, morphological and electrical properties of its components and theideal situation is to studied them in-situ or in-operation conditions. In our group we have been working in thedesign of a multipurpose instrument capable to perform measurements of X-ray and electrochemically relatedtechniques simultaneously under non-ambient conditions (high temperature under a wide variety of atmospheres)or even in-operando measurements of high temperature electrochemical devices. We present some results of themeasurements of the structural and/or electronic changes of several materials using the developed cell in the hightemperature X-ray laboratory diraction camera and in the X-ray powder diraction (XPD) and X-ray absorption(XAFS) synchrotron beamlines at LNLS. Some of the studied systems are: the gadolinium-doped ceria (GDC)that is considered as one of the most promising electrolytes for IT-SOFC, composite materials formed by NiO andGDC which were widely studied for the preparation of ecient anodes and perovskite materials such as La(1 􀀀x)SrxCo(1􀀀y)FeyO(3􀀀d) (LSCF) that were recognized as excellent cathodes. The structural and morphologicalcharacteristics are analyzed by X-Ray Diraction and Transmission and Scanning Electron Microscopy, respectively.The correlation between the electrochemical behavior, electronic properties and microstructural characteristics willbe discussed.