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Characterization of solid electrode materials using chronoamperometry: a study of the alkaline γ-MnO₂ electrode

By Aaron P. Malloy and Scott W. Donne

Abstract

Large voltage step chronoamperometry is shown to be a time-efficient means to examine solid electrode materials compared with conventional electrochemical methods such as linear sweep voltammetry (LSV) and step potential electrochemical spectroscopy (SPECS), all the while providing comparable information concerning the rate capability of a material and its capacity. The applicability of the technique is demonstrated through a study of the alkaline γ-MnO₂ electrode. By sampling the current (and hence the charge) at various times after the chronoamperometric voltage step, the compatibility between chronoamperometry and LSV is disclosed. Furthermore, modelling of the chronoamperometric data using two curves based on a spherical diffusion model representing fast and slow discharge processes are found to be statistically suitable. From this modelling, values of A√D (where A is the electrochemically active surface area and D is the diffusion coefficient) for the two processes are 3.89×10⁻⁴ and 0.70×1010⁻⁴cm³ s⁻¹/² g⁻¹, respectively, both of which are comparable with A√D data extracted from a SPECS experiment on an identical electrode

Topics: chronoamperometry, solid electrodes, solid-state diffusion, manganese dioxide, electrochemically active surface area
Publisher: Elsevier
Year: 2008
DOI identifier: 10.1016/j.jpowsour.2007.12.108
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