Effect of morphology of manganese oxide on the capacitive behavior of electrodes

Zaeem Ur Rehman, Mohsin Ali Raza, Aoun Hussnain, Uzair Naveed Chishti, Aqil Inam, Farasat Ali, Muhammad Faheem Maqsood

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    9 Scopus citations


    Manganese oxide (MnO2) was synthesized by reduction of potassium permanganate followed by calcination in air at 200, 400 and 600 °C. Morphology and structure of MnO2 was characterized by scanning electron microscopy and X-ray diffraction, respectively. Electrochemical characterization of MnO2-based electrodes was carried out by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). CV results revealed that MnO2-based electrode calcined at 200 °C showed maximum specific capacitance of 177 F g-1 at a scan rate of 1 mVs-1 in 3 M potassium hydroxide. EIS analysis of electrode produced with MnO2 that was calcined at 200 °C showed solution resistance and charge transfer resistance values of 0.421 and 1.605 Ω, respectively. CV results also revealed that MnO2-based electrodes showed capacitance retention of 89 % at 50 mVs-1 scan rate for 1000 cycles.

    Original languageBritish English
    Article number115552
    JournalMaterials Research Express
    Issue number11
    StatePublished - 6 Nov 2019


    • electrochemical characterization
    • manganese oxide
    • Morphology
    • specific capacitance
    • supercapacitor electrodes


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