Separating the faradaic and non-faradaic contributions to the total capacitance for different manganese dioxide phases

Title: Separating the faradaic and non-faradaic contributions to the total capacitance for different manganese dioxide phases
Creator: Dupont, Madeleine F.; Donne, Scott W.
Relation: Journal of the Electrochemical Society Vol. 162, Issue 5, p. A5096-A5105
Publisher Link: http://dx.doi.org/10.1149/2.0161505jes
Publisher: Electrochemical Society
Resource Type: journal article
Date: 2015
Description: Six different phases of manganese dioxide have been examined to determine the different contributions made by double layer capacitance and pseudo-capacitive redox reactions (or diffusion limited processes) to the total charge storage. These processes were separated using a novel combination of step potential electrochemical spectroscopy (SPECS), in which the electrode is charged and discharged in a series of small (±25 mV) potential steps, combined with modelling of the current response to determine the different charge storage processes occurring at the electrode. The manganese dioxide phases were all cycled in 0.5 M Na₂SO₄ between 0.0-0.8 V (vs SCE). The results indicate that the different properties of the samples, such as crystal structure, surface area and porosity affect the relative contributions from the each charge storage process.
Subject: manganese dioxide; diffusion limited processes; energy storage
Identifier: http://hdl.handle.net/1959.13/1337243
Identifier: uon:27800
Identifier: ISSN:0013-4651
Language: eng
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