Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

Journal of the Brazilian Chemical Society

Tânia M Benedetti¹  Vinicius R Gonçales¹  Denise F. S Petri¹  Susana I. Córdoba De Torresi¹  Roberto M Torresi¹ 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP ,Brazil

关键词: supercapacitors;    manganese oxide;    porous electrodes;    template assisted electro deposition;    wettability;   

DOI  :  10.1590/S0103-50532010000900016

来源: SciELO

【 摘 要 】

Macroporous MnO2 electrodes prepared by template-assisted electrodeposition using spherical polystyrene colloidal particles are studied. The wettability of such electrodes by a LiClO4 aqueous electrolyte is measured by the contact angle technique. Cyclic voltammetry experiments are performed in order to evaluate the use of these electrodes for electrochemical capacitor applications. The specific capacity obtained is about 60% higher than that obtained for flat MnO2 surfaces showing that, in spite of the wettability being lower, some penetration of the electrolyte into the pores must occur, increasing the electroactive area with respect to the flat electrode. Furthermore, the macroporous electrode showed excellent electrochemical stability, with neither a capacitance decrease nor a loss of morphology, after 1000 cycles.

【 授权许可】

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