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Exceptional catalytic activity of hollow structured La0.6Sr0.4CoO3−δ perovskite spheres in aqueous media and aprotic Li–O2 batteries

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Abstract

Hollow structured La0.6Sr0.4CoO3−δ (HS-LSC) perovskite spheres are synthesised via a template assisted approach and utilized as a bi-functional catalyst in both aqueous and non-aqueous media. Optimization of the calcination temperature has been performed to yield a single-phase HS-LSC. Rotating ring disk electrode measurements of HS-LSC in 0.1 M KOH exhibit two-fold higher (apex of limiting current is 4.974 mA cm−2) oxygen evolution reaction (OER) capability than that of the commercial RuO2 (1.84 mA cm−2). The excellent oxygen reduction reaction (ORR) activity and durability up to 5400 s of HS-LSC also registered as comparable to those of Pt/C. The organic medium OER and ORR activities of the catalyst were explored from a Li–O2 battery perspective. The HS-LSC catalyst based Li–O2 battery delivered a deep discharge capacity of ∼4895 mA h g−1 with high coulombic efficiency (∼82%), and rate capability. Excellent cycling stability is also evidenced for a limited capacity of 500 mA h g−1. Unprecedentedly, the favourable structural and morphological features facilitate O2 transport, electrolyte immersion and ion diffusion processes promoting the catalytic reaction kinetics on the electrode.

Graphical abstract: Exceptional catalytic activity of hollow structured La0.6Sr0.4CoO3−δ perovskite spheres in aqueous media and aprotic Li–O2 batteries

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Publication details

The article was received on 15 May 2017, accepted on 30 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04189F
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Exceptional catalytic activity of hollow structured La0.6Sr0.4CoO3−δ perovskite spheres in aqueous media and aprotic Li–O2 batteries

    P. Sennu, V. Aravindan, K. S. Nahm and Y. Lee, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA04189F

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