Siam Physics Congress 2017

Effect of MnO2 morphology on electrochemical capacitance of supercapacitor electrode

24 May 2017, 15:10

50m

Rayong Marriott Resort & Spa

Poster Nanoscale Physics and Nanotechnology Poster Presentation I

Speaker

Mr Authit Phakkhawan (Khon Kaen University)

Description

In this study, different surface morphologies of MnO${}_2$ (rod, wire, urchin and tube-like MnO${}_2$) with an $\alpha$-phase crystalline structure were synthesized via a hydrothermal process by adding various reagents. The crystalline structure and morphology were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, the electrochemical properties were measured using cyclic voltammetry (CV) and galvanostatic charge/discharge (C.D.) in 1 M Na${}_2$SO${}_4$ aqueous solution. The specific capacitance of rod, wire, urchin and tube-like MnO${}_2$ were about 110.20, 73.49, 53.80 and 64.31 F g${}^{-}$${}^1$. Especially, the rod-like MnO${}_2$ exhibits a highest capacitance of 110.2 F g${}^{-}$${}^1$ at the current density of 0.5 A g${}^{-}$${}^1$ due to its smallest size.