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Title: Microstructural changes in NiO–ScSZ composite following reduction processes in pure and diluted hydrogen

A Ni–ScSZ cermet is widely used as the anode in a solid oxide fuel cell because it possesses the appropriate electrochemical properties. However, it is susceptible to degradation during operation. Samples of a NiO–ScSZ composite were reduced in pure and diluted hydrogen to determine the microstructural evolution and the degradation behavior of the material. The resulting changes in microstructure were investigated using scanning transmission electron microscopy, X-ray energy dispersive spectroscopy and electron energy loss spectroscopy. The resulting data revealed that the various conditions during the reduction processes had a significant effect on the microstructures. The high porosity of the reduced nickel phase and cracking between the Ni and the ZrO{sub 2} phases after reduction resulted in a reduction in the strength of the anode material. - Highlights: • Structure of NiO/Ni strongly depends on the concentration of reduction atmosphere • Scandium rich precipitations are visible in YSZ phase after reduction process • Nanopores and nanograins are formed in reduced Ni phase.
Authors:
 [1] ; ;  [2] ; ; ;  [3] ; ;  [1]
  1. Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw (Poland)
  2. Institute for Problems of Materials Science, Kyiv (Ukraine)
  3. Physical-Mechanical Institute, Lviv (Ukraine)
Publication Date:
OSTI Identifier:
22288728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 87; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRACKING; ELECTROCHEMISTRY; ENERGY-LOSS SPECTROSCOPY; MICROSTRUCTURE; NANOSTRUCTURES; NICKEL; NICKEL OXIDES; POROSITY; SOLID OXIDE FUEL CELLS; TRANSMISSION ELECTRON MICROSCOPY; YTTRIUM OXIDES; ZIRCONIUM OXIDES