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17 Cards in this Set
- Front
- Back
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Parallel plate capacitor |
C= e*eo*A/d, units farad |
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e |
Relative permittivity |
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eo |
Permittivity of space |
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Charge capacitor |
Q=CV |
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Energy stored in capacitor |
E=.5CV^2 |
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Capacitive charging current |
Non faradic current, occurs because electrode solution interface behaves like an electrical capacitor Q=CV |
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C |
Capacitance |
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Q |
Charge stored at electrode solution interface |
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V |
Potential difference across interface volts |
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Solvation shell |
Electrostatic interactions cause the formation of a shell of solvent molecules around dissolved ions |
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Electric double layer |
C=e*eo*A/d d is really small therefore C is large. D 1nm or less |
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Ihp |
Oriented solventmolecules and ions that lose solvation shell |
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Ohp |
Solvated ions adsorbed onto electrode surface |
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Diffuse layer |
Solvated ions that don't adsorb into surface |
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Electrochemical capacitors |
Store electricity in separate charges, store charge in the electric double layer that forms at the interface between a metal electrode and electrolyte, capacitance are much higher than conventional capacitors because of smaller D and higher a by using high surface carbon electrodes |
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Challenge and improve |
Increase energy density of ecs |
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Energy density |
E=.5CV^2, max power p=v^2/4R |
