Hall Effect Measurements of the Double-Layer Capacitance of the Graphene–Electrolyte Interface
| Autor: | Morgan A. Brown, Carly V. Fengel, Michael S. Crosser, Ethan D. Minot, Agatha Ulibarri |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Double-layer capacitance 02 engineering and technology 010402 general chemistry 01 natural sciences Capacitance law.invention Quantum capacitance law Hall effect Physics::Chemical Physics Physical and Theoretical Chemistry Supercapacitor business.industry Graphene Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Electrostatics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Optoelectronics Charge carrier 0210 nano-technology business |
| Zdroj: | The Journal of Physical Chemistry C. 123:22706-22710 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | There is an ongoing effort to improve the energy storage capacity of graphene-based supercapacitors. These supercapacitors store energy in the electric field between the charge carriers in the graphene and the counter ions in a liquid electrolyte. To characterize this double layer, we use the Hall effect to determine the charge carrier density in graphene as a function of voltage. We disentangle the separate roles of double-layer capacitance (the electrostatic contribution) and quantum capacitance and compare the performance of different electrolytes. Our results highlight the advantages of Hall effect measurements for probing the electrostatics of graphene–electrolyte interfaces. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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