- Title
- Charge storage mechanisms in electrochemical capacitors: effects of electrode properties on performance
- Creator
- Dupont, Madeleine F.; Donne, Scott W.
- Relation
- Journal of Power Sources Vol. 326, p. 613-623
- Publisher Link
- http://dx.doi.org/10.1016/j.jpowsour.2016.03.073
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- The capacitive behaviour of four commonly studied electrochemical capacitor systems has been analyzed using the step potential electrochemical spectroscopy (SPECS) method. Electrode-electrolyte combinations with different charge storage mechanisms were characterized, including activated carbon in aqueous (H₂SO₄) and organic (TEABF₄ in acetonitrile) electrolytes, manganese dioxide (Na₂SO₄) and anhydrous ruthenium oxide (H₂SO₄). The SPECS method was used to separate the charge storage contributions from double layer capacitance (CDL) and diffusion-limited pseudo-capacitance (CD) at scan rates ranging from 0.08 to 125 mV/s. The relative contributions from each process are related to the physicochemical properties of the electrode. Additionally, the effects of these electrode properties on the overall performance of each system, in terms of specific power and energy, are identified.
- Subject
- electrochemical capacitors; charge storage processes; double layer charge storage; pseudo-capacitance; step potential electrochemical spectroscopy
- Identifier
- http://hdl.handle.net/1959.13/1336980
- Identifier
- uon:27746
- Identifier
- ISSN:0378-7753
- Language
- eng
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