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Nickel vanadium sulfide grown on nickel copper phosphide dendrites/Cu fibers for fabrication of all-solid-state wire-type micro-supercapacitors

Naderi, L ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cej.2020.124880
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. Herein, we have successfully fabricated NiVS/NiCuP nanostructures on Cu wire as a fiber electrode for high performance FSMSCs applications. The 3D NiCuP dendritic film was firstly deposited on Cu wire through the electrodeposition method, which not only act as a scaffold for deposition of the electroactive materials (NiV-LDH and NiV-S), but also served as a micro-porous current collector, supplied extra capacitances. Then, NiV-LDH nanosheets grown on 3D NiCuP film were obtained using a hydrothermal method. The sulfidation of NiV-LDH is carried out through an ion-exchange reaction of OH– with S2– to obtain NiVS, which maintains an ultrathin and porous structure, improves the electrical conductivity and reduces the diffusion resistance of the electrode. The as-prepared c-NiVS/NiCuP/CW electrode exhibits outstanding specific capacitance (13.4 F cm−2, 1.7 F cm−1, 1342.28 F cm−3 at a current density of 4 mA cm−2) compared with the pristine NiV-LDH and NiVS directly growing on Cu wire in the absence of 3D NiCuP film. Finally, a solid state asymmetric fiber-shaped micro-supercapacitor (FSAMSCs) is fabricated using c-NiVS/NiCuP/CW as the positive electrode and rGO/CF as the negative electrode. The assembled FSMSC device has a maximum operational voltage of 1.8 V and presented a high energy density of 295 µWh cm−2 (22.7 mWh cm−3 and 46.35 µWh cm−1) at a power density of 4.3 mW cm−2 (330.7 mW cm−3 and 674.7 µW cm−1) with an excellent cycling stability (91.5% of its initial specific capacitance after 3000 cycles) and good mechanical stability. These results suggest that the fabricated device has excellent potential as a power source for next generation flexible and portable fiber-based energy storage micro-devices. © 2020 Elsevier B.V
  6. Keywords:
  7. Cu wire ; Fern- like dendritic ; Fiber-shaped electrode ; Flexible micro-supercapacitor ; NiCu phosphide ; NiV sulphide ; Capacitance ; Copper compounds ; Electrodes ; Fabrication ; Fibers ; Ion exchange ; Mechanical stability ; Nanosheets ; Reduced graphene oxide ; Sulfur compounds ; Supercapacitor ; Vanadium compounds ; Wire ; Diffusion resistance ; Electrical conductivity ; Electroactive material ; Electrodeposition methods ; High energy densities ; Ion exchange reactions ; Micro supercapacitors ; Specific capacitance ; Nickel compounds
  8. Source: Chemical Engineering Journal ; Volume 392 , 15 July , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1385894720308718