Capacitive Behavior of MnO2 Nanowires Prepared by Hydrothermal Synthesis Method

Mei Gen Deng; Ying Fang Chen

doi:10.4028/www.scientific.net/AMR.152-153.1551

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 152-153Capacitive Behavior of MnO2 Nanowires Prepared by...

Capacitive Behavior of MnO₂ Nanowires Prepared by Hydrothermal Synthesis Method

Abstract:

KMnO4 and MnSO4 were used to prepare MnO2 nanowires for supercapacitors hydrothermal synthesis method. Scanning electron microscope (SEM), N2 adsorption-desorption and X-ray diffraction (XRD) were used to analyze the as prepared MnO2. Electrochemical performance of MnO2 was characterized by cyclic voltammetry and galvanostatic charge/discharge. The results showed that the nanowires were α-MnO2 with a diameter of 30 to 40 nm. The specific surface area and mean pore diameter was 164.5 m2g-1 and 3.1 nm, respectively. In an electrolyte of 1 molL-1 (NH4)2SO4, the MnO2 had typical capacitive characterization in the potential region of –0.4～0.5V(vs. SCE). At a current density of 10 mAcm-2, a specific capacitance of 466 Fg-1 was achieved. Supercapacitors based on the nanowires exhibited high cycling efficiency

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Periodical:

Advanced Materials Research (Volumes 152-153)

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1551-1554

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https://doi.org/10.4028/www.scientific.net/AMR.152-153.1551

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Online since:

October 2010

Authors:

Mei Gen Deng, Ying Fang Chen

Keywords:

Hydrothermal Synthesis Method, MnO₂ Nanowire, Specific Capacitance, Super-Capacitor (SC)

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