Hollow La0.5Sr0.5MnO3 nanospheres as an electrocatalyst for the oxygen reduction reaction in alkaline media

Hollow perovskite oxide La0·5Sr0·5MnO3 nanospheres are synthesized by using carbon spheres as template in the presence of citric acid. Among the samples investigated in this work, the one obtained at a sintering temperature of 700 °C exhibits the highest catalytic activity in the oxygen reduction re...

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Bibliographic Details
Published in:International journal of hydrogen energy 2020-04, Vol.45 (22), p.12514-12524
Main Authors: Ji, Qianqian, Bi, Lei, Zhang, Jintao, Cao, Haijie, Zhao, X.S.
Format: Article
Language:English
Subjects:
Carbon sphere
Hollow nanosphere
Noble-metal-free catalyst
Oxygen reduction reaction
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Summary:Hollow perovskite oxide La0·5Sr0·5MnO3 nanospheres are synthesized by using carbon spheres as template in the presence of citric acid. Among the samples investigated in this work, the one obtained at a sintering temperature of 700 °C exhibits the highest catalytic activity in the oxygen reduction reaction (ORR) in an alkaline electrolyte. The electrochemical measurement data shows that the sample has a positive onset potential (0.860 V) and a high limiting current density (6.48 mA cm−2). Furthermore, the catalyst shows a high selectivity towards methanol and a better stability than a commercial Pt/C catalyst. The hollow La0·5Sr0·5MnO3 nanoshperes described in this manuscript hold a great promise for applications in metal-air batteries and alkaline fuel cells. [Display omitted] •Hollow La0·5Sr0·5MnO3 nanospheres were synthesized using template method.•The nanospheres exhibited high ORR activity, good selectivity and durability.•The hollow La0·5Sr0·5MnO3 nanospheres are promising noble-metal-free catalyst.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2020.02.189