Three-dimensional arrays of 1D MnO2 nanocrystals for all-solid-state asymmetric supercapacitors
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 device...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:270826 |
| Acceso en línea: | https://ddd.uab.cat/record/270826 https://dx.doi.org/urn:doi:10.1002/cplu.201500054 |
| Access Level: | acceso abierto |
| Palabra clave: | Capacitors Electrochemistry Manganese Nanostructures Solid-state structures |
| Sumario: | 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. |
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