The significant effect of the phase composition on the oxygen reduction reaction activity of a layered oxide cathode

Jiang, Shanshan, Sunarso, Jaka, Zhou, Wei and Shao, Zongping 2013, The significant effect of the phase composition on the oxygen reduction reaction activity of a layered oxide cathode, Journal of materials chemistry A, vol. 1, no. 36, pp. 11026-11032.

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Title The significant effect of the phase composition on the oxygen reduction reaction activity of a layered oxide cathode
Author(s) Jiang, Shanshan
Sunarso, Jaka
Zhou, Wei
Shao, Zongping
Journal name Journal of materials chemistry A
Volume number 1
Issue number 36
Start page 11026
End page 11032
Total pages 7
Publisher RSC Publications
Place of publication Cambridge, England
Publication date 2013
ISSN 2050-7488
Summary Layered oxides of Sr4Fe4Co2O13 (SFC2) which contains alternating perovskite oxide octahedral and polyhedral oxide double layers are attractive for their mixed ionic and electronic conducting and oxygen reduction reaction properties. In this work, we used the EDTA–citrate synthesis technique to prepare SFC2 and vary the calcination temperature between 900 and 1100 _C to obtain SFC2, containing different phase content of perovskite (denoted as SFC-P) and (Fe,Co) layered oxide phases (SFC-L). Rietveld refinements show that the SFC-P phase content increased from _39 wt% to _50 wt% and _61 wt% as the calcination temperature increased from 900 _C (SFC2-900) to 1000 _C (SFC2-1000) and 1050 _C (SFC2-1050). At 1100 _C (SFC2-1100), SFC-P became the dominant phase. The oxygen transport properties (e.g. oxygen chemical diffusion coefficient and oxygen permeability), electrical conductivity and oxygen reduction reaction activity is enhanced in the order of SFC2-1000, SFC2-1100 and SFC2-1050. The trend established here therefore negates the hypothesis that the perovskite phase content correlates with the oxygen transport property enhancement. The results suggest instead that there is an optimum composition value (e.g. 61 wt% of SFC-L for SFC2-1050 in this work) on which synergistic effects take place between the SFC-P and SFC-L phase.
Language eng
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30057608

Document type: Journal Article
Collection: Institute for Frontier Materials
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