Oxygen permeability, stability and electrochemical behavior of Pr2NiO4+delta-based materials
authors Kovalevsky, AV; Kharton, VV; Yaremchenko, AA; Pivak, YV; Tsipis, EV; Yakovlev, SO; Markov, AA; Naumovich, EN; Frade, JR
nationality International
journal JOURNAL OF ELECTROCERAMICS
author keywords praseodymium nickelate; mixed ionic-electronic conductor; oxygen permeation; thermal expansion; SOFC cathode
keywords R = LA; HIGH-TEMPERATURE; TRANSPORT-PROPERTIES; OXIDES; CONDUCTIVITY; MEMBRANES; SURFACE; PR; ND; CU
abstract The high-temperature electronic and ionic transport properties, thermal expansion and stability of dense Pr2NiO4+delta Pr2Ni0.9Fe0.1O4+delta ceramics have been appraised in comparison with K2NiF4-type lanthanum nickelate. Under oxidizing conditions, the extensive oxygen uptake at temperatures below 1073-1223 K leads to reversible decomposition of Pr2NiO4-based solid solutions into Ruddlesden-Popper type Pr4Ni3O10 and praseodymium oxide phases. The substitution of nickel with copper decreases the oxygen content and phase transition temperature, whilst the incorporation of iron cations has opposite effects. Both types of doping tend to decrease stability in reducing atmospheres as estimated from the oxygen partial pressure dependencies of total conductivity and Seebeck coefficient. The steady-state oxygen permeability of Pr2NiO4+delta ceramics at 1173-1223 K, limited by both surface-exchange kinetics and bulk ionic conduction, is similar to that of La2NiO4+delta. The phase transformation on cooling results in considerably higher electronic conductivity and oxygen permeation, but is associated also with significant volume changes revealed by dilatometry. At 973-1073 K, porous Pr2Ni0.8Cu0.2O4+delta electrodes deposited onto lanthanum gallate-based solid electrolyte exhibit lower anodic overpotentials compared to Pr2Ni0.8Cu0.2O4+delta, whilst cathodic reduction decreases their performance.
publisher SPRINGER
issn 1385-3449
year published 2007
volume 18
issue 3-4
beginning page 205
ending page 218
digital object identifier (doi) 10.1007/s10832-007-9024-7
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000248625300005
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journal impact factor 1.238
5 year journal impact factor 1.455
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