☆ 4.7 Article Proceedings Paper

La2NiO4+δ as cathode for SOFC: Reactivity study with YSZ and CGO electrolytes

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2010)

期刊

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

卷 35, 期 11, 页码 6031-6036

出版社

PERGAMON-ELSEVIER SCIENCE LTD

DOI: 10.1016/j.ijhydene.2009.12.077

关键词

SOFC cathode La2NiO4+delta; YSZ; CGO; Chemical stability

类别

Chemistry, Physical Electrochemistry Energy & Fuels

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摘要

In this work was studied the electrochemical response of La(2)Nia(4+delta) Fa compound by impedance spectroscopy measurements. This compound is a potential cathode material to be used in Solid Oxide Fuel Cell (SOFC). The area specific resistances (ASR) of a La2NiO4+delta/YSZ/La2NiO4+delta symmetrical cell were determined between 600 and 800 degrees C. The ASR values increases with time suggesting a chemical reaction between the cells components. Reactivity studies were carried out between La2NiO4+delta and both YSZ and CGO electrolytes. The reactivity studies were performed by means of two different tests: La2NiO4+delta films deposited onto both electrolytes and heated at 900 degrees C for 72 h (Pellet Test), and intimate mixture of La2NiO4+delta with either YSZ or CGO powders were heat treated at 900 degrees C during 2 h (Powders Test). In each case the reaction products were evaluated by XRD. Both studies suggest a high reactivity between the electrode (La2NiO4+delta) and the electrolytes (YSZ, CGO). (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

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