Three-dimensional arrays of 1D MnO2 nanocrystals for all-solid-state asymmetric supercapacitors

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(Institut Català de Nanociència i Nanotecnologia)
Holze, Rudolf (Technische Universität Chemnitz. Institut für Chemie)
Gómez-Romero, Pedro 1959-

(Institut Català de Nanociència i Nanotecnologia)

Título variante:	3D arrays of 1D MnO2 nanocrystals for all solid state asymmetric supercapacitors
Fecha:	2015
Resumen:	Reported is the synthesis of 3D hierarchical structures based on one-dimensional MnO2 nanobuilding blocks (nanorods, nanowires, and nanoneedles) by means of a facile and scalable coprecipitation method and their use as electrodes for the assembly of all-solid-state supercapacitors. Asymmetric devices were also assembled by using these nanostructured MnO2 materials as the positive electrode and reduced graphene oxide (rGO) as the negative electrode with a polymeric gel electrolyte. The asymmetric cells successfully extend the working voltage windows beyond 1. 4 V and allowed for a maximum voltage of 1. 8 V. An asymmetric device based on hierarchical nanoneedle-like MnO2 and rGO achieved a maximum specific capacitance of 99 F g−1 at a scan rate of 10 mV s−1 with a stable operational voltage of 1. 8 V. This high value allowed for a large specific energy of 24. 12 Wh kg−1.
Ayudas:	Ministerio de Economía y Competitividad SEV-2013-0295
Nota:	Altres ajuts: Beatriu de Pinós (BP-DGR-2013)
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Capacitors ; Electrochemistry ; Manganese ; Nanostructures ; Solid-state structures
Publicado en:	ChemPlusChem, Vol. 80, issue 6 (June 2015) , p. 944-951, ISSN 2192-6506

Preprint
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