NDLI: Oxygen permeability, stability and electrochemical behavior of $$ \Pr _{2} {\text{NiO}}

Content Provider	Springer Nature Link
Author	Kovalevsky, A. V. Kharton, V. V. Yaremchenko, A. A. Pivak, Y. V. Tsipis, E. V. Yakovlev, S. O. Markov, A. A. Naumovich, E. N. Frade, J. R.
Copyright Year	2007
Abstract	The high-temperature electronic and ionic transport properties, thermal expansion and stability of dense $$ \Pr _{2} {\text{NiO}}_{{4 + \delta }} ,\Pr _{2} {\text{Ni}}_{{0.9}} {\text{Fe}}_{{0.1}} {\text{O}}_{{4 + \delta }} $$ and $$ \Pr _{2} {\text{Ni}}_{{0.8}} {\text{Cu}}_{{0.2}} {\text{O}}_{{4 + \delta }} $$ ceramics have been appraised in comparison with K$_{2}$NiF$_{4}$-type lanthanum nickelate. Under oxidizing conditions, the extensive oxygen uptake at temperatures below 1073–1223 K leads to reversible decomposition of Pr$_{2}$NiO$_{4}$-based solid solutions into Ruddlesden–Popper type Pr$_{4}$Ni$_{3}$O$_{10}$ 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 $$ \Pr _{2} {\text{NiO}}_{{4 + \delta }} $$ ceramics at 1173–1223 K, limited by both surface-exchange kinetics and bulk ionic conduction, is similar to that of $$ {\text{La}}_{2} {\text{NiO}}_{{4 + \delta }} $$ . 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 $$ \Pr _{2} {\text{Ni}}_{{0.8}} {\text{Cu}}_{{0.2}} {\text{O}}_{{4 + \delta }} $$ electrodes deposited onto lanthanum gallate-based solid electrolyte exhibit lower anodic overpotentials compared to $$ {\text{La}}_{2} {\text{Ni}}_{{0.8}} {\text{Cu}}_{{0.2}} {\text{O}}_{{4 + \delta }} $$ , whilst cathodic reduction decreases their performance.
Starting Page	205
Ending Page	218
Page Count	14
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	18
Issue Number	3-4
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2007-02-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Praseodymium nickelate Mixed ionic–electronic conductor Oxygen permeation Thermal expansion SOFC cathode Crystallography Electrochemistry Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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