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Characterization of Manganese Oxides/Au Nanocompsite Thin Films for Supercapacitor

机译:超级电容器用氧化锰/金纳米复合薄膜的表征

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Nanocomposite of manganese oxides/Au thin films were electrodeposited on ITO glass substrate bythe potentiostatic method in KMnO4/AuCl3 aqueous solution. The thickness of the thin films wasabout 50~100nm composed of manganese oxide nanoparticles. MnOOH formed as the primary phaseunder electrodeposition without Au addition. The films exhibit the mixture of amorphous MnO2nH2Oand MnOOH phases under electrodeposition with Au addition. The nanocomposite thin films werecharacterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectronspectroscopy, cyclic voltammetry and impedance spectroscopy. The electrodes with 0.8% Au showedexcellent capacitive behavior in the 0.1 M KNO3 electrolyte, with highest specific capacitance of 1230-3 -1 Fcm at a scan rate of 20mVs . The nanocomposite films became looser with lots of small creviceswhen Au was added from the SEM surface morphology observation. This gives smaller diffusionimpedance and larger capacitance through the interconnected pores for proton diffusion.
机译:通过恒电位法在KMnO4 / AuCl3水溶液中电沉积氧化锰/ Au薄膜的纳米复合材料。由氧化锰纳米颗粒组成的薄膜厚度约为50〜100nm。 MnOOH在不添加Au的电沉积下形成为主相。该膜在电沉积和添加金的情况下表现出非晶态MnO2nH2O和MnOOH相的混合物。通过扫描电子显微镜,透射电子显微镜,X射线光电子能谱,循环伏安法和阻抗谱来表征纳米复合薄膜。 Au含量为0.8%的电极在0.1 M KNO3电解质中表现出优异的电容性能,在20mVs的扫描速率下具有最高的比电容1230-3 -1 Fcm。当从SEM表面形貌观察中添加Au时,纳米复合膜变得较松散,具有许多小缝隙。这使得较小的扩散阻抗和较大的电容通过相互连接的孔进行质子扩散。

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