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Oxygen Transport Properties of Ca-Doped Pr2NiO4 Full article

Journal Solid State Ionics
ISSN: 0167-2738
Output data Year: 2018, Volume: 317, Pages: 234-243 Pages count : 10 DOI: 10.1016/j.ssi.2018.01.035
Tags Isotope exchange, Oxygen diffusion, Pr2−xCaxNiO4
Authors Sadykov V.A. 1,2 , Pikalova E.Y. 3,4 , Kolchugin A.A. 3,4 , Filonova E.A. 4 , Sadovskaya E.M. 1,2 , Eremeev N.F. 1 , Ishchenko A.V. 1,2 , Fetisov A.V. 5 , Pikalov S.M. 5
Affiliations
1 Boreskov Institute of Catalysis SB RAS, 5 Akad. Lavrentieva av., Novosibirsk 630090, Russia
2 Novosibirsk State University, 2 Pirogova st., Novosibirsk 630090, Russia
3 Institute of High Temperature Electrochemistry UB RAS, 20 Akademicheskaya st., Yekaterinburg 620137, Russia
4 Ural Federal University, 19 Mira st., Yekaterinburg 620002, Russia
5 Institute of Metallurgy, UB RAS, 101 Amundsena st., Yekaterinburg 620137, Russia

Funding (4)

1 Federal Agency for Scientific Organizations 0303-2016-0013
2 Russian Science Foundation 16-13-00112
3 The Ministry of Education and Science of the Russian Federation 02.A03.21.0006
4 Federal Agency for Scientific Organizations 007-ГЗ/У4197/395

Abstract: Praseodymium nickelate Pr2NiO4+δ with layered Ruddlesden–Popper (R–P) structure is a promising material for the ceramic membranes for oxygen separation and for SOFC cathodes due to its mixed ionic-electronic conducting nature and high oxygen mobility and surface reactivity. However, a low thermal stability and the inadequate electronic conductivity of Pr2NiO4+δ require its doping for a more efficient performance. This work presents results of study of the effect of Ca doping on the structural and transport properties of Pr2NiO4. Pr2−xCaxNiO4 oxides (x = 0–0.6) were synthesized by a co-precipitation method and characterized by XRD, XPS and TEM methods. The oxygen content in these materials and its variation with increasing temperature was evaluated using TGA. The oxygen transport properties of powdered samples were studied by the temperature-programmed oxygen isotope heteroexchange with C18O2 (TPIE). Electrical conductivity of compact samples was measured by a dc four-probe technique. Electrochemical measurements were performed using an impedance spectroscopy method with symmetrically arranged electrodes on the Ce0.8Sm0.2O1.9 electrolyte. It was shown that doping resulted in enhanced electrical conductivity and at a low Ca content the electrochemical activity of electrodes increased while the interstitial oxygen content and oxygen diffusivity gradually decreased. For x > 0.3 increasing the lattice anisotropy resulted in the co-existence of 2–3 channels of oxygen diffusion revealed as separate peaks in TPIE curves. The fast diffusion channel (D⁎ ~ 10−8 cm2/s at 700 °C), with a share in the total diffusion drastically decreasing at big doping levels, corresponds to the fast interstitial oxygen diffusion via the cooperative mechanism while the slow channels (D⁎ < 10−10 cm2/s) are probably related to the oxygen transport in perovskite layers and the complicated transport involving interlayer positions near the dopant cation sites.
Cite: Sadykov V.A. , Pikalova E.Y. , Kolchugin A.A. , Filonova E.A. , Sadovskaya E.M. , Eremeev N.F. , Ishchenko A.V. , Fetisov A.V. , Pikalov S.M.
Oxygen Transport Properties of Ca-Doped Pr2NiO4
Solid State Ionics. 2018. V.317. P.234-243. DOI: 10.1016/j.ssi.2018.01.035 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
Submitted: Sep 15, 2017
Accepted: Jan 24, 2018
Published online: Feb 21, 2018
Published print: Apr 1, 2018
Identifiers:
Web of science: WOS:000428101100036
Scopus: 2-s2.0-85041480418
Elibrary: 35483801
Chemical Abstracts: 2018:221676
Chemical Abstracts (print): 171:76058
OpenAlex: W2791149586
Citing:
DB Citing
Web of science 34
Scopus 35
Elibrary 35
OpenAlex 37
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