One-pot synthesis of hierarchical porous carbons with extended ultramicropores: new prospective materials for supercapacitors
A series of carbon electrodes was synthesized via a modification of the polymerization-condensation reaction, where a 4:1 mass excess of melamine was added in basic media to the resorcinol/formaldehyde classical mixture. Melamine, together with variations of the pyrolysis temperature play a key role...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/173344 |
| Acceso en línea: | http://hdl.handle.net/11336/173344 |
| Access Level: | acceso abierto |
| Palabra clave: | HIERARCHICAL POROSITY MELAMINE N-DOPING POROUS CARBONS SYMMETRICAL SUPERCAPACITOR https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | A series of carbon electrodes was synthesized via a modification of the polymerization-condensation reaction, where a 4:1 mass excess of melamine was added in basic media to the resorcinol/formaldehyde classical mixture. Melamine, together with variations of the pyrolysis temperature play a key role to define the chemical and textural properties of these carbons. A high nitrogen content, ranging from 23.2 to 11.3 % was determined. A low degree of crystallinity and disordered internal structure were assessed, while a hierarchical porous structure was stablished for all samples, including an important ultramicroporosity, with pore sizes below 0.7 nm. All electrodes showed a predominant double layer capacitive behaviour in aqueous H2SO4, while a small pseudocapacitive contribution was also evidenced for the three carbons pyrolysed at higher temperatures. These three electrodes show the highest specific capacitance (maximum of 153.6 F g−1), and outstanding cycling over 10,000 cycles. A comprehensive analysis correlating morphological and surface properties and the electrochemical behaviour was carried out. The best performing carbon was selected to construct a symmetrical device for which a specific capacitance of 103 F g−1 was determined, reaching energy and power density values of 1.4 Wh Kg−1 and 111.7 W Kg−1, respectively. |
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