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In Situ X‐Ray Spectromicroscopy Investigation of the Material Stability of SOFC Metal Interconnects in Operating Electrochemical Cells
Author(s) -
Bozzini Benedetto,
Tondo Elisabetta,
Prasciolu Mauro,
Amati Matteo,
Abyaneh Majid Kazemian,
Gregoratti Luca,
Kiskinova Maya
Publication year - 2011
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201100140
Subject(s) - electrolyte , materials science , oxide , electrochemistry , yttria stabilized zirconia , in situ , chemical engineering , metal , durability , cathodic protection , x ray photoelectron spectroscopy , electrochemical cell , diffusion , solid oxide fuel cell , nanotechnology , electrode , metallurgy , chemistry , cubic zirconia , composite material , ceramic , physics , organic chemistry , engineering , thermodynamics
The present in situ study of electrochemically induced processes occurring in Cr/Ni bilayers in contact with a YSZ electrolyte aims at a molecular‐level understanding of the fundamental aspects related to the durability of metallic interconnects in solid oxide fuel cells (SOFCs). The results demonstrate the potential of scanning photoelectron microspectroscopy and imaging to follow in situ the evolution of the chemical states and lateral distributions of the constituent elements (Ni, Cr, Zr, and Y) as a function of applied cathodic potential in a cell working at 650 °C in 10 −6 mbar O 2 ambient conditions. The most interesting findings are the temperature‐induced and potential‐dependent diffusion of Ni and Cr, and the oxidation–reduction processes resulting in specific morphology–composition changes in the Ni, Cr, and YSZ areas.