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Modified electrodes based on MnO2 electrodeposited onto carbon felt: an evaluation toward supercapacitive applications

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Abstract

This work describes the electrochemical characterization toward supercapacitive properties of a modified electrode based on MnO2 electrodeposited onto carbon felt electrode (CFE/MnO2). Raman analysis confirmed the electrode modification and FEG-SEM images showed a 3D network structure with a homogeneous deposit of the MnO2 film. The morphology of the electrodeposited film showed to be dependent on the electrodeposition applied potential and time. Cyclic voltammetry and galvanostatic charge/discharge curve results showed that the charge storage process is reversible and a combination of EDLC and pseudocapacitive behavior. Under optimized conditions (1.2 V and 600 s), the modified electrode presented a specific capacitance of 541 F g−1 in an applied current density of 0.2 A g−1, which was attributed to a favored accessibility of the electrolyte on the film porous due to morphological issues. Besides, the modified electrode revealed a good capacitance retention of 80% in an applied current density of 1.0 A g−1 after 1000 cycles.

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Acknowledgements

We would like to thank Brazilian funding agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação Araucária (Brazil) for financial support. The authors are also grateful to the Institutional Laboratory C-LABMU (UEPG).

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Correspondence to L. F. Marchesi or C. A. Pessôa.

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Santos, C.S., de Oliveira, R.D., Pitchaimuthu, S. et al. Modified electrodes based on MnO2 electrodeposited onto carbon felt: an evaluation toward supercapacitive applications. Chem. Pap. 74, 887–894 (2020). https://doi.org/10.1007/s11696-019-00920-9

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  • DOI: https://doi.org/10.1007/s11696-019-00920-9

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