Abstract
Designing a novel, efficient and cost-effective nanocomposite with the advantage of robust structure and outstanding conductivity is highly promising for the electrode materials of high-performance supercapacitors. Herein, we designed and synthesized a hierarchical structured NiMoO4@rGO/NF via a facile and scalable approach by growing NiMoO4 nanowires onto the skeleton of reduced graphene oxide (rGO)/Ni foam (NF). The as-made NiMoO4@rGO/NF exhibits a superior electrochemical behavior owing to the coupling effect of homogeneous NiMoO4 nanowires and high conductivity of rGO, and it exhibits a superb capacitance value of 1877 F g−1 at 1 A g−1 and shows a ultralong life span with over 98% capacitance retention after 4000 cycles at 5 A g−1 in 2 M KOH electrolyte. Moreover, an asymmetric device employing NiMoO4@rGO/NF composite and activated carbon is assembled with an aqueous electrolyte, and it displays a maximum energy density of 40 Wh kg−1 at a specific power 218.2 W kg−1. Interestingly, the asymmetric device can remain 111.2% of its initial value even after 8000 charge/discharge cycles. These results demonstrate that the NiMoO4@rGO/NF binder-free electrode provides greatly enhanced electrochemical performance and shows promising application as an anode for energy storage.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant No. 51401140), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20131402110003, 20131402120004), the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT) and the Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology (2016–06).
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Xu, Y., Xuan, H., Gao, J. et al. Hierarchical three-dimensional NiMoO4-anchored rGO/Ni foam as advanced electrode material with improved supercapacitor performance. J Mater Sci 53, 8483–8498 (2018). https://doi.org/10.1007/s10853-018-2171-1
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DOI: https://doi.org/10.1007/s10853-018-2171-1