Ultrathin Mesoporous RuCo2O4 Nanoflakes : An Advanced Electrode for High-Performance Asymmetric Supercapacitors
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Chodankar, Nilesh R. (Chonnam National University)
Holze, Rudolf (Technische Universität Chemnitz. Institut für Chemie)
Kim, Do-Heyoung (Chonnam National University)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Date:	2017
Abstract:	A new ruthenium cobalt oxide (RuCoO) with a unique marigold-like nanostructure and excellent performance as an advanced electrode material has been successfully prepared by a simple electrodeposition (potentiodynamic mode) method. The RuCoO marigolds consist of numerous clusters of ultrathin mesoporous nanoflakes, leaving a large interspace between them to provide numerous electrochemically active sites. Strikingly, this unique marigold-like nanostructure provided excellent electrochemical performance in terms of high energy-storage capacitance (1469 F g at 6 A g) with excellent rate proficiency and long-lasting operating cycling stability (ca. 91. 3 % capacitance retention after 3000 cycles), confirming that the mesoporous nanoflakes participate in the ultrafast electrochemical reactions. Furthermore, an asymmetric supercapacitor was assembled using RuCoO (positive electrode) and activated carbon (negative electrode) with aqueous KOH electrolyte. The asymmetric design allowed an upgraded potential range of 1. 4 V, which further provided a good energy density of 32. 6 Wh kg (1. 1 mWh cm). More importantly, the cell delivered an energy density of 12. 4 Wh kg even at a maximum power density of 3. 2 kW kg, which is noticeably superior to carbon-based symmetric systems.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1505
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Batteries ; Electrochemistry ; Metal oxides ; Nanoparticles ; Supercapacitors
Published in:	ChemSusChem, Vol. 10, Issue 8 (April 2017) , p. 1771-1782, ISSN 1864-564X

DOI: 10.1002/cssc.201700001

Preprint 49 p, 2.9 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles