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Ni–YSZ Solid Oxide Fuel Cell Anode Behavior Upon Redox Cycling Based on Electrical Characterization
Author(s) -
Klemensø Trine,
Mogensen Mogens
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01909.x
Subject(s) - cermet , yttria stabilized zirconia , materials science , sintering , anode , cubic zirconia , oxidizing agent , solid oxide fuel cell , redox , oxide , nickel , degradation (telecommunications) , metallurgy , conductivity , chemical engineering , ceramic , electrode , chemistry , telecommunications , organic chemistry , computer science , engineering
Nickel (Ni)—yttria‐stabilized zirconia (YSZ) cermets are a prevalent material used for solid oxide fuel cells. The cermet degrades upon redox cycling. The degradation is related to microstructural changes, but knowledge of the mechanisms has been limited. Direct current conductivity measurements were performed on cermets and cermets where the Ni component was removed. Measurements were carried out before, during, and after redox cycling the cermet. The cermet conductivity degraded over time due to sintering of the nickel phase. Following oxidizing events, the conductivity of the cermets improved, whereas the conductivity of the YSZ phase decreased. An improved model of the redox degradation mechanism was established based on the measurements.