Facile preparation of MnO2@C composite nanorods for high-performance supercapacitors
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Novel MnO2@C composite nanorods were successfully prepared by a facile solvothermal method. The results showed that a uniform carbon layer was formed around the MnO2 nanorods. The carbon layer provided a highly conductive pathway to boost the charge transport involved during the capacitance generation. The electrochemical properties of MnO2@C composite nanorods were investigated by cyclic voltammetry and galvanostatic charge–discharge. The composites as electrode materials of supercapacitors exhibited high specific capacitance (295 F/g) compared with MnO2 nanorods (149 F/g) with a wide operation window (0–1.0 V). The electrochemical impedance spectroscopic studies showed the charge-transfer resistance (Rct) of the MnO2@C composite nanorods (1.10 Ω) was much lower than that of pure MnO2 (2.53 Ω). Moreover, the MnO2@C composite nanorods exhibited excellent cycling behavior with no more than 5 % capacitance loss after 2000 cycles. These results indicated that the MnO2@C composite nanorods could be a promising electrode material for high-performance electrochemical capacitors.
KeywordsHigh Resolution Transmission Electron Microscopy MnO2 Specific Capacitance High Resolution Transmission Electron Microscopy Carbon Layer
The present work is supported financially by the National Natural Science Foundation of China (Grant Nos. 51302063 and 51402082), the Natural Science Foundation of Hebei Province (Grant Nos. EB2014402077 and 2015402058), Program for the Top Young Talents of Higher Learning Institutions of Hebei (Grant Nos. BJ2014018 and BJ2014016).
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