- Title
- Electroanalytical characterization of electrochemical capacitor systems using step potential electrochemical spectroscopy
- Creator
- Forghani, Marveh; Mavroudis, Helena; McCarthy, Julien; Donne, Scott W.
- Relation
- Electrochimica Acta Vol. 332, Issue 1 February 2020, no. 135508
- Publisher Link
- http://dx.doi.org/10.1016/j.electacta.2019.135508
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2020
- Description
- Herein we demonstrate the application of step potential electrochemical spectroscopy (SPECS) to the electroanalytical characterization of a symmetrical activated carbon non-aqueous (tetraethylammonium tetrafluoroborate in acetonitrile) electrochemical capacitor device. Through the use of a Ag/Ag+ reference electrode, individual electrode potentials were measured showing that even though it is a symmetrical device, polarization on the positive electrode was always greater than the negative electrode, implying that the negative electrode capacitance is greater. Deconvolution of the i-t transients from the SPECS experiment across the device voltage window can be accomplished in a similar fashion to the study of a single electrode, in which case geometric and porous capacitances, as well as diffusion and residual processes are identified. Similarly, the components of the i-t transients can be converted into voltametric data, providing access to individual electrode performance over a wide range of sweep rates in the device. The inclusion of a sensing electrode between he positive and negative electrodes is also described, providing insight into electrolyte fluxes and electrode stability within the device.
- Subject
- step potential electrochemical spectroscopy (SPECS); electrochemical capacitors; electroanalytical characterization; activated carbon
- Identifier
- http://hdl.handle.net/1959.13/1463729
- Identifier
- uon:46822
- Identifier
- ISSN:0013-4686
- Language
- eng
- Reviewed
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