Imperial College London
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Professor Stephen Skinner

Faculty of Engineering, Department of Materials

CeresPower/RAEng Research Chair in Electrochemical Devices
 
 
 
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Contact

 

+44 (0)20 7594 6782s.skinner

 
 
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Location

 

206GoldsmithSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Skinner:2016:10.1021/jacs.5b11373,
author = {Skinner, SJ and Horsfield, A and Pramana, S and Wu, J and Tucker, M and Baikie, T and Bayliss, R and White, T and Kloc, C and Tao, A and Wei, F and Schreyer, M},
doi = {10.1021/jacs.5b11373},
journal = {Journal of the American Chemical Society},
pages = {1273--1279},
title = {Correlation of local structure and diffusion pathways in the modulated anisotropic oxide ion conductor CeNbO4.25},
url = {http://dx.doi.org/10.1021/jacs.5b11373},
volume = {138},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - CeNbO4.25 is reported to exhibit fast oxygen ion diffusion at moderate temperatures, making this the prototype of a new class of ion conductor with applications in a range of energy generation and storage devices. To date, the mechanism by which this ion transport is achieved has remained obscure, in part due to the long range commensurately modulated structural motif. Here we show that CeNbO4.25 forms with a unit cell ~12 times larger than the stoichiometric tetragonal parent phase of CeNbO4 as a result of the helical ordering of Ce3+ and Ce4+ ions along z. Interstitial oxygen ion incorporation leads to a cooperative displacement of the surrounding oxygen species creating inter-layer “NbO6“ connectivity by extending the oxygen coordination number to 7 and 8. Molecular dynamic simulations suggest that fast ion migration occurs predominantly within the xz plane. It is concluded that the oxide ion diffuses anisotropically, with the major migration mechanism being intra-layer; however when obstructed, oxygen can readily move to an adjacent layer along y via alternate lower energy barrier pathways.
AU  - Skinner,SJ
AU  - Horsfield,A
AU  - Pramana,S
AU  - Wu,J
AU  - Tucker,M
AU  - Baikie,T
AU  - Bayliss,R
AU  - White,T
AU  - Kloc,C
AU  - Tao,A
AU  - Wei,F
AU  - Schreyer,M
DO  - 10.1021/jacs.5b11373
EP  - 1279
PY  - 2016///
SN  - 0002-7863
SP  - 1273
TI  - Correlation of local structure and diffusion pathways in the modulated anisotropic oxide ion conductor CeNbO4.25
T2  - Journal of the American Chemical Society
UR  - http://dx.doi.org/10.1021/jacs.5b11373
UR  - https://pubs.acs.org/doi/10.1021/jacs.5b11373
UR  - http://hdl.handle.net/10044/1/28874
VL  - 138
ER  -
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