Dimensional tailoring of nitrogen-doped graphene for high performance supercapacitors
| Autor: | Seungyong Lee, Min Wook Chung, Jaehoon Chung, Chang Hyuck Choi, Seong Ihl Woo |
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| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Materials science Graphene General Chemical Engineering Graphene foam Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences law.invention law Electrode Charge carrier 0210 nano-technology Graphene nanoribbons Graphene oxide paper |
| Zdroj: | RSC Advances. 6:55577-55583 |
| ISSN: | 2046-2069 |
| Popis: | Due to its unique properties, graphene has been regarded as a promising electrode material in various fields of energy conversion and storage devices. In supercapacitors, however, the graphene electrodes show unexpectedly poor energy densities due to low transferability of charge carriers in the randomly overlaid graphene electrodes. For efficient charge transfers, construction of three-dimensional graphene structures has been generally considered. In this study, contrary to previous strategies, the graphene structures are sequentially tailored from two-dimensional sheets to one-dimensional ribbons and zero-dimensional dots, and then their capacitive behaviors are investigated in a symmetric unit cell. Dimensionality of the graphene determines the local pore structure and morphology of the fabricated graphene electrodes. Hence, it strongly affects the transfer rate of charge carriers and capacitive performance. One-dimensional ribbons, which have a high length-to-width ratio and a consequent net-like porous structure in the fabricated electrode, demonstrate an efficient charge transferability with 378 F g−1 specific capacitance at 1 A g−1 current density in 6 M KOH electrolyte. Additionally, a durability study coupled with X-ray photoelectron spectroscopy (XPS) reveals that performance degradation of the graphene-based electrodes mainly results from surface oxidation which inhibits facile electron transfers. |
| Databáze: | OpenAIRE |
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