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- Title
Three-Dimensional Arrays of 1D MnO<sub>2</sub> Nanocrystals for All-Solid-State Asymmetric Supercapacitors.
- Authors
Dubal, Deepak P.; Holze, Rudolf; Gomez‐Romero, Pedro
- Abstract
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.
- Subjects
THREE-dimensional imaging; MANGANESE oxides; NANOCRYSTALS; SOLID state chemistry; SUPERCAPACITORS
- Publication
ChemPlusChem, 2015, Vol 80, Issue 6, p944
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.201500054