Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/916895

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Title
Activity of perovskite La₁₋xSrxMnO₃ catalysts towards oxygen reduction in alkaline electrolytes
Author/Creator
Tulloch, John;  Donne, Scott W.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
Description
The behaviour of the perovskite-based series of compounds La₁₋xSrxMnO₃ (where x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) towards oxygen reduction in an ambient temperature alkaline 1 M KOH electrolyte is presented. Within this series, the intermediate compound La₀․₄Sr₀․₆MnO₃ exhibits the greatest catalytic activity, approaching that of the considerably more expensive fuel cell grade Pt-black examined under the same conditions. The origin of this activity is discussed in terms of material structure and morphology, which exists in the structural transition region between cubic LaMnO₃ and hexagonal SrMnO₃. The small crystallite size and relatively large BET surface area of this material reflect this high level of structural disorder. Furthermore, these features enable this compound to exhibit the greatest proportion of direct four-electron oxygen reduction (preferred) compared to the less efficient two-electron reduction to peroxide.
Relation
Journal of Power Sources Vol. 188, Issue 2, p. 359-366
Publisher Link
http://dx.doi.org/10.1016/j.jpowsour.2008.12.024
Date
2009
Publisher
Elsevier
Keyword(s)
lanthanum strontium manganate;  perovskite;  oxygen reduction;  alkaline electrolytes
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/916895
Identifier
ISSN:0378-7753
Reviewed
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Subject
"Journal of Power Sources"
 
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