Nitrogen-doped reduced graphene oxide as electrode material for high rate supercapacitors
Nitrogen-doped reduced graphene oxides (N-rGOs) have been synthesized at various temperatures by a facile hydrothermal route involving the doping of an aqueous graphene oxide dispersion with amitrole. The N-rGOs had a nitrogen content ranging from 10.9 to 13.4 at%, which is among the highest reporte...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/345825 |
| Acceso en línea: | http://hdl.handle.net/10261/345825 https://api.elsevier.com/content/abstract/scopus_id/85006986875 |
| Access Level: | acceso abierto |
| Palabra clave: | Supercapacitor Amitrole Hydrothermal treatment Nitrogen-doped reduced graphene oxide Pseudocapacitance http://metadata.un.org/sdg/7 http://metadata.un.org/sdg/9 http://metadata.un.org/sdg/8 Ensure access to affordable, reliable, sustainable and modern energy for all Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation |
| Sumario: | Nitrogen-doped reduced graphene oxides (N-rGOs) have been synthesized at various temperatures by a facile hydrothermal route involving the doping of an aqueous graphene oxide dispersion with amitrole. The N-rGOs had a nitrogen content ranging from 10.9 to 13.4 at%, which is among the highest reported for this type of material. The predominant nitrogen species were pyridinic followed by amide/amine, pyrrolic, and quaternary nitrogen. Cyclic voltammetry and impedance spectroscopy measurements performed on the N-doped and nitrogen-free samples revealed that nitrogen fixation provided the material with pseudocapacitive behaviour and improved ion diffusion and charge propagation. A high specific capacitance of 244 F g −1 was obtained at a high scan rate of 100 mV s −1 for the N-rGO with the highest nitrogen content. An outstanding rate capability for the N-rGO, with increasing scan rates, of 98% was obtained, while only 70% was obtained for the non-doped rGO. 92% of the initial capacitance was maintained over 5000 charge/discharge cycles due to the high stability of the electrochemically active nitrogen moieties. Hydrothermal synthesis using amitrole as a nitrogen dopant represents a simple route for the synthesis of graphene with very high nitrogen content and exceptional behaviour for use as electrode material in high-power supercapacitors. |
|---|