The electrochemistry of size dependent graphene via liquid phase exfoliation: capacitance and ionic transport
| Autor: | Montree Sawangphruk, Chakrit Nualchimplee, Nuttapon Pisitpipathsin, Wisit Hirunpinyopas, Pawin Iamprasertkun, T. Saisopa, Varisara Deerattrakul |
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| Rok vydání: | 2021 |
| Předmět: |
Supercapacitor
Materials science Graphene General Physics and Astronomy Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance Exfoliation joint 0104 chemical sciences law.invention law Electrode Pyrolytic carbon Graphite Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics. 23:11616-11623 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Recently, graphene-based materials have become ubiquitous in electrochemical devices including electrochemical sensors, electrocatalysts, capacitive and membrane desalination and energy storage devices. However, many of the electrochemical properties of graphene (particularly the capacitance and ionic transport) are not yet fully understood. This paper explores the capacitance and ionic transport properties of size dependent graphene (from 100 nm to 1 μm) prepared through the liquid phase exfoliation of graphite in which the size of graphene was finely selected using a multi-step centrifugation technique. Our experiment was then expanded to include basal plane graphene using highly ordered pyrolytic graphite as a model electrode, describing the assumed theoretical graphene capacitance (quoted as 550 F g−1 or 21 μF cm−2) and the electrochemical surface area of the carbon-based materials. This work improves our understanding of graphene electrochemistry (capacitance and ion transport), which should lead to the continuing development of many high-performance electrochemical devices, especially supercapacitors, capacitive desalination and ion-based selective membranes. |
| Databáze: | OpenAIRE |
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