Imperial College London
Alternate

ProfessorJohnKilner

Faculty of Engineering, Department of Materials

Senior Research Investigator
 
 
 
//

Contact

 

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

 
 
//

Location

 

214Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Shen:2018:10.1021/acs.jpcc.8b06302,
author = {Shen, Z and Kilner, J and Skinner, S},
doi = {10.1021/acs.jpcc.8b06302},
journal = {The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces},
pages = {27135--27147},
title = {Mass Transport in (La0.8Sr0.2)0.95CrxFe1–xO3−δ–Scandia-stabilised zirconia dualphase composite as a dense layer in oxygen transport membranes},
url = {http://dx.doi.org/10.1021/acs.jpcc.8b06302},
volume = {122},
year = {2018}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Electrical and oxygen-ion transport in the dual-phase composite systems (La0.8Sr0.2)0.95CrxFe1–xO3−δ (LSCrF) (x = 0.3, 0.5, 0.7)–10 mol % Sc2O3–1 mol % CeO2–89 mol % ZrO2 (10Sc1CeSZ) have been investigated. In these three (x = 0.3, 0.5, 0.7) dual-phase systems, the pure ionic conductor 10Sc1CeSZ dominates the oxygen bulk diffusion whereas the mixed electronic and ionic conductor LSCrF is the predominant phase for oxygen surface exchange and provides pathways for a counter flow of electrons to maintain electrical neutrality. Hence, the electrical conductivity of the dual-phase composite materials increases whereas the diffusion coefficient decreases with increase of the LSCrF content, as expected. However, the surface exchange coefficients as a function of the LSCrF composition show significant scatter. For both phases, once the volume fraction is lower than 30%, the continuous network starts to disconnect and percolation thresholds were observed for both electrical conductivity and oxygen diffusion coefficients in the composites. For the composites with three-dimensional networks of both phases, no obvious difference was observed for the electrical conductivity and oxygen tracer diffusion behavior and it was also confirmed that the microstructures may have a minor effect on the oxygen diffusion behavior of the dual-phase materials. Furthermore, the microscale studies of oxygen diffusion in each phase of the dual-phase composite reveal a synergistic effect between these two phases: the surface exchange coefficient, k, of LSCrF decreases while that for the 10Sc1CeSZ phase k increases when compared with their corresponding isolated single-phase materials.
AU  - Shen,Z
AU  - Kilner,J
AU  - Skinner,S
DO  - 10.1021/acs.jpcc.8b06302
EP  - 27147
PY  - 2018///
SN  - 1932-7447
SP  - 27135
TI  - Mass Transport in (La0.8Sr0.2)0.95CrxFe1–xO3−δ–Scandia-stabilised zirconia dualphase composite as a dense layer in oxygen transport membranes
T2  - The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces
UR  - http://dx.doi.org/10.1021/acs.jpcc.8b06302
UR  - http://hdl.handle.net/10044/1/66320
VL  - 122
ER  -
Download