Exceptional catalytic activity of hollow structured La0.6Sr0.4CoO3−δ perovskite spheres in aqueous media and aprotic Li–O2 batteries
| Autor: | Palanichamy Sennu, Kee Suk Nahm, Vanchiappan Aravindan, Yun-Sung Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Rotating ring-disk electrode Renewable Energy Sustainability and the Environment Chemistry Limiting current Oxygen evolution Nanotechnology 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Catalysis Chemical engineering law General Materials Science Calcination 0210 nano-technology Faraday efficiency |
| Zdroj: | Journal of Materials Chemistry A. 5:18029-18037 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta04189f |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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