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Citation: HU Jie, YUAN An-Bao, WANG Yu-Qin, WANG Xiu-Ling. Improved Cyclability of Nano-MnO₂/CNT Composite Supercapacitor Electrode Derived fromRoom-Temperature Solid Reaction[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 987-993. doi: 10.3866/PKU.WHXB20090410 shu

Improved Cyclability of Nano-MnO₂/CNT Composite Supercapacitor Electrode Derived fromRoom-Temperature Solid Reaction

1.
Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, P. R. China

Received Date: 4 November 2008
Available Online: 16 February 2009

To improve the charge/discharge cycle stability of a nanostructured manganese dioxide electrode for supercapacitor applications, a series of nano-MnO2/carbon nanotube (CNT) hybrid electrode materials with different mass fractions of CNTs were prepared. The materials were prepared using a room-temperature solid-grinding reaction betweenMn(OAc)2·4H2Oand NH4HCO3 in the presence of CNTs to obtain a precursor. This was followed by calcination and an acid-treatment process and the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) surface analysis. XRD results indicated that the MnO2 in the composites was nanostructured 酌-MnO2. Electrochemical performance of the MnO2/CNT composite electrodes in 1 mol·L-1 LiOH alkaline aqueous electrolyte was studied and compared to a pure nano-MnO2 electrode without CNTs. The MnO2/CNT composite electrodes with 10% or 20% (w, mass fraction) CNTs showed far superior cycle stability than the pure MnO2 electrode. The MnO2/CNT composite electrode with 10% CNTs exhibited od cycling stability and also a high specific capacitance of 200 F·g-1 at a high charge/discharge current rate of 1000 mA·g-1.
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Improved Cyclability of Nano-MnO2/CNT Composite Supercapacitor Electrode Derived fromRoom-Temperature Solid Reaction

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通讯作者: 陈斌, bchen63@163.com

Improved Cyclability of Nano-MnO₂/CNT Composite Supercapacitor Electrode Derived fromRoom-Temperature Solid Reaction