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Author: search.filters.author.Winadda, WongwiriyapanSubject: search.filters.subject.Electrodeposition

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    Item type:Publication,
    Electrodeposition of manganese oxide nanosheets as supercapacitor electrode materials
    (2016-01-01)
    Thanthamrong, Wanchaem
    ;
    Songsak, Rattanamai
    ;
    Paweena, Dulyaseree
    ;
    Wirat, Jarernboon
    ;
    Winadda, Wongwiriyapan
    Manganese oxide (MnO<inf>x</inf>) thin films were prepared on stainless steel (SS) 304 by galvanostatic (GS) mode of electrodeposition technique using different precursors; 0.1 M potassium permanganate (KMnO<inf>4</inf>) and 0.1 M manganese sulfate (MnSO<inf>4</inf>) solutions. The electrodeposition condition was set at a constant current of 1 mA/cm2. Different precursors provide MnO<inf>x</inf> thin films with different morphologies. Using KMnO<inf>4</inf> as a precursor, the MnO<inf>x</inf> thin film was deposited (MnO<inf>x</inf>-K), while using MnSO<inf>4</inf> as a precursor, the MnO<inf>x</inf> nanosheets with a thickness of approximately 40 nm were formed (MnO<inf>x</inf>-S). XPS results evidence the formation of manganese oxide with different oxidation states composition by different precursors. Electrochemical measurements were carried out in a three-electrode setup using Pt and Ag/AgCl electrodes as counting and reference electrodes, respectively and 1M Na<inf>2</inf>SO<inf>4</inf> aqueous solution as electrolyte. MnO<inf>x</inf>-K at a deposition time of 10 min shows the highest specific capacitance of 233.55±19.01 F/g. The specific capacitance improvement of MnO<inf>x</inf>-K may be attributed to MnO<inf>x</inf> nanosheet structure which increases surface area of electrode.