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Effect of chemical modification of graphite nanoplatelets on electrochemical performance of MnO2 electrodes

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Abstract

To improve wettability between electrode material and electrolyte for high-rate supercapacitor application, the surfaces of graphite nanoplatelets (GNPs) were chemically modified by concentrated acids. The functional groups were confirmed by Fourier transform infrared spectra (FTIR) and zeta potential measurement. The microstructures and morphology of composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical properties of the composites were characterized by cyclic voltammograms (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). At high discharge rates, the increase of specific capacitance of electrode material was primarily attributed to the improvement in wettability between electrode material and electrolyte, which came from the attached hydrophilic functional groups, resulting in rapid proton transport and more ion-accessible surface area.

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Acknowledgments

This work was supported by the Fundamental Research Foundation of Harbin Engineering University (Project HEUFT07094) and the Foundation of Harbin Innovation Fellow (2006RFQXG030). The authors also thank Professor Dianxue Cao for electrochemical tests.

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Authors and Affiliations

  1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, People’s Republic of China

    Jun Yan, Zhuangjun Fan, Tong Wei & Milin Zhang

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  1. Jun Yan
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  2. Zhuangjun Fan
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  3. Tong Wei
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  4. Milin Zhang
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Correspondence to Zhuangjun Fan.

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Yan, J., Fan, Z., Wei, T. et al. Effect of chemical modification of graphite nanoplatelets on electrochemical performance of MnO2 electrodes. J Mater Sci: Mater Electron 21, 619–624 (2010). https://doi.org/10.1007/s10854-009-9966-4

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  • DOI: https://doi.org/10.1007/s10854-009-9966-4

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