Enhancing the supercapacitor performance of graphene/MnO2 nanostructured electrodes by conductive wrapping |
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Authors: | Yu Guihua Hu Liangbing Liu Nian Wang Huiliang Vosgueritchian Michael Yang Yuan Cui Yi Bao Zhenan |
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Affiliation: | Department of Chemical Engineering, Stanford University , Stanford, California 94305, United States. |
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Abstract: | MnO2 is considered one of the most promising pseudocapactive materials for high-performance supercapacitors given its high theoretical specific capacitance, low-cost, environmental benignity, and natural abundance. However, MnO2 electrodes often suffer from poor electronic and ionic conductivities, resulting in their limited performance in power density and cycling. Here we developed a "conductive wrapping" method to greatly improve the supercapacitor performance of graphene/MnO2-based nanostructured electrodes. By three-dimensional (3D) conductive wrapping of graphene/MnO2 nanostructures with carbon nanotubes or conducting polymer, specific capacitance of the electrodes (considering total mass of active materials) has substantially increased by ~20% and ~45%, respectively, with values as high as ~380 F/g achieved. Moreover, these ternary composite electrodes have also exhibited excellent cycling performance with >95% capacitance retention over 3000 cycles. This 3D conductive wrapping approach represents an exciting direction for enhancing the device performance of metal oxide-based electrochemical supercapacitors and can be generalized for designing next-generation high-performance energy storage devices. |
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