Electrodeposited the gold/manganese oxides as nano supercapacitor

In this study, the nano-supercapacitors were electrodeposited the gold/manganese oxides thin film with potassium permanganate and gold chloride solution on ITO substrate. It was deposited for 200 s by potentiostatic method (0.7 V v.s. open circuit). The morphology and the microstructure of the films were examined by SEM (scan electron microscopy). The thickness of the thin films was about 30~100 nm and the thin films composed of MnO₂ nano particles with Au. And the states of the ions were investigated by X-ray photoelectron spectroscopy (XPS). Such nano structure of the thin film contributes to much higher capacitance than traditional thin film supercapacitors. This is attributed to the lowering of impedance of the nano-supercapacitor by adding Au. In this study, the film with 0.2 wt% god has trice capacitance and power than pure MnO₂.