Preparation of Ag-Nanoparticle-Loaded MnO2 Nanosheets and Their Capacitance Behavior

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• 作者：Gaini Zhang ; Lu Zheng ; Miao Zhang ; Shaohua Guo ; Zong-Huai Liu ; Zupei Yang ; Zenglin Wang
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：January 19, 2012
• 年：2012
• 卷：26
• 期：1
• 页码：618-623
• 全文大小：816K
• 年卷期：v.26,no.1(January 19, 2012)
• ISSN：1520-5029

文摘

Silver-loaded manganese oxide nanosheets have been prepared by a reassembling reaction between Ag⁺ ions and delaminated manganese oxide nanosheets, followed by a reduction treatment. The morphologies and structures of the obtained materials are examined by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The reassembling process of the manganese oxide nanosheets is effectively prevented, and manganese oxide nanosheets exist in a complete exfoliation state in Ag-loaded manganese oxide nanosheets. Ag nanoparticles with a size of about 5 nm are highly monodispersed on the manganese oxide nanosheets without agglomeration. The electrochemical properties are characterized by cyclic voltammetry and electrochemical impedance spectroscopy in a 1 mol L^鈥? Na₂SO₄ electrolyte. The Ag-loaded manganese oxide nanosheet electrode shows a characteristic Faradic capacitance behavior, and the specific capacitance value is 272 F g^鈥? at a scan rate of 10 mV s^鈥?, much higher than that of the manganese oxide nanosheet electrode (90 F g^鈥?). The introduction of Ag nanoparticles into the manganese oxide nanosheet electrode can significantly improve the electrical performance because of the increase in conductivity.