Imperial College London
Alternate

ProfessorJohnKilner

Faculty of Engineering, Department of Materials

Senior Research Investigator
 
 
 
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Contact

 

+44 (0)20 7594 6745j.kilner Website

 
 
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Location

 

214Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inbook{Sadykov:2010,
author = {Sadykov, VA and Pavlova, SN and Kharlamova, TS and Muzykantov, VS and Uvarov, NF and Okhlupin, YS and Ishchenko, AV and Bobin, AS and Mezentseva, NV and Alikina, GM and Lukashevich, AI and Krieger, TA and Larina, TV and Bulgakov, NN and Tapilin, VM and Belyaev, VD and Sadovskaya, EM and Boronin, AI and Sobyanin, VA and Bobrenok, OF and Smirnova, AL and Smorygo, OL and Kilner, JA},
booktitle = {Perovskites: Structure, Properties and Uses},
pages = {67--178},
title = {Perovskites and their nanocomposites with fluorite-like oxides as materials for solid oxide fuel cells cathodes and oxygen-conducting membranes: Mobility and reactivity of the surface/bulk oxygen as a key factor of their performance},
year = {2010}
}
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RIS format (EndNote, RefMan)

TY  - CHAP
AB  - This paper presents results of research aimed at elucidating factors controlling mobility and reactivity of the surface and bulk oxygen of complex perovskite-like AnBmOz oxides (manganites, ferrites, cobaltites, nickelates of La/Sr) and their nanocomposites with fluorite-like oxides (doped ceria or zirconia) as related to their performance in the intermediate temperature solid oxide fuel cells (IT SOFC) cathodes and oxygen separation membranes. Real/defect structure and surface properties of these materials as a function of both composition, preparation route and sintering temperature were studied by combination of TEM with EDX, XRD, EXAFS, UV-Vis and XPS methods. Lattice oxygen mobility, strength of oxygen species bonding with the surface sites and their reactivity for both dispersed and dense materials were estimated by oxygen isotope exchange, temperature-programmed desorption and reduction by H2 and CH4. Coefficients of oxygen diffusion in dense materials were estimated by analysis of dynamics of the oxygen loss monitored by measurements of the weight loss or conductivity relaxations. For analysis of atomic-scale factors controlling oxygen bonding strength and mobility, quantum-chemical approaches including the Density Functional Theory (DFT) in spin-polarized SLDA approximation and semiempirical Interacting Bonds Method were applied. For simple perovskites, along with well-known effects of anion vacancies/interstitial oxygen atoms and high-charge transition metal cations generated due to the oxygen non-toichiometry, pronounced effects of the surface faces termination, ordering of oxygen vacancies and appearance of extended defects were found to affect the oxygen mobility and reactivity as well. From the microscopic point of view, decreasing the Me-O bonding strength and increasing the distance between A and B cations due to the lattice parameter increase helps to decrease the activation barriers for the oxygen diffusion in the perovskite-like lattice. For perov
AU  - Sadykov,VA
AU  - Pavlova,SN
AU  - Kharlamova,TS
AU  - Muzykantov,VS
AU  - Uvarov,NF
AU  - Okhlupin,YS
AU  - Ishchenko,AV
AU  - Bobin,AS
AU  - Mezentseva,NV
AU  - Alikina,GM
AU  - Lukashevich,AI
AU  - Krieger,TA
AU  - Larina,TV
AU  - Bulgakov,NN
AU  - Tapilin,VM
AU  - Belyaev,VD
AU  - Sadovskaya,EM
AU  - Boronin,AI
AU  - Sobyanin,VA
AU  - Bobrenok,OF
AU  - Smirnova,AL
AU  - Smorygo,OL
AU  - Kilner,JA
EP  - 178
PY  - 2010///
SN  - 9781616685256
SP  - 67
TI  - Perovskites and their nanocomposites with fluorite-like oxides as materials for solid oxide fuel cells cathodes and oxygen-conducting membranes: Mobility and reactivity of the surface/bulk oxygen as a key factor of their performance
T1  - Perovskites: Structure, Properties and Uses
ER  -
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