- Title
- Semiconductor Properties of Electrodeposited Manganese Dioxide for Electrochemical Capacitors: Mott-Schottky Analysis
- Creator
- Forghani, Marveh; McCarthy, Julien; Cameron, Amanda P.; Davey, Sofia B.; Donne, Scott W.
- Relation
- Electrochemical Society. Journal Vol. 168, Issue 2, no. 020508
- Publisher Link
- http://dx.doi.org/10.1149/1945-7111/abdde2
- Publisher
- Electrochemical Society
- Resource Type
- journal article
- Date
- 2021
- Description
- Herein the semiconducting nature of electrodeposited manganese dioxide (γ-MnO 2) is examined for its effects on pseudo- capacitive electrode behaviour in neutral electrolytes. Electrochemical analysis of the manganese dioxide electrode is achieved using a combination of cyclic voltammetry (CV), step potential electrochemical spectroscopy (SPECS) and electrochemical impedance spectroscopy (EIS), in particular the combination of SPECS and EIS in a single experiment, enabling the determination of electronic properties across the full potential window. After establishing stable cycling with CV, electrode performance is examined using SPECS. EIS data, recorded under quasi-equilibrium conditions at the end of each potential step rest period, is then analyzed using the Mott-Schottky equation, leading to the identification of both n-type and p-type behaviour for the manganese dioxide electrode. Flat band potentials are determined (V fb,n = −0.34 V vs SCE and V fb,p = 0.98 V vs SCE), and conclusions about the electrochemically active surface area being more closed related to the geometric surface area were reached.
- Subject
- electrode performance; electrochemical capacitors; electrodeposited manganese dioxide; semiconductor properties
- Identifier
- http://hdl.handle.net/1959.13/1434537
- Identifier
- uon:39450
- Identifier
- ISSN:0013-4651
- Language
- eng
- Reviewed
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