Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 15, Pages 5669-5677Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00078a
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Funding
- Opening Foundation of State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals [SKLAB02015001]
- National Science Foundation of China [51402277, 51402274, 21401180]
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A hierarchical NiCo2S4@Ni3V2O8 core/shell hybrid was in situ grown on nickel foam through a facile hydrothermal process combined with a simple co-precipitation method. Further characterization shows that the hybrid consists of highly conductive NiCo2S4 as the core and uniformly distributed Ni3V2O8 nanoparticles as the shell. When used as the binder-free electrode, the hybrid material takes advantage of both components and exhibits excellent electrochemical activity, demonstrating a higher specific capacity of 512 C g(-1) at a current density of 1 A g(-1) and a better rate capability of 396 C g(-1) at 10 A g(-1). The enhanced pseudocapacitive performance of the NiCo2S4@Ni3V2O8 hybrid is mainly attributed to its unique core/shell structure, which provides fast ion and electron transport. Finally, a NiCo2S4@Ni3V2O8// activated carbon asymmetric supercapacitor is successfully assembled and it can deliver a maximum energy density of 42.7 W h kg(-1) at a power density of 200 W kg(-1), making it a promising candidate for superior electrodes for supercapacitor applications.
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