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Nanocomposites Based on Hierarchical Porous Carbon Fiber@Vanadium Nitride Nanoparticles as Supercapacitor Electrodes

Abstract

In this study, a hybrid electrode material for supercapacitors based on hierarchical porous carbon fiber@vanadium nitride nanoparticles is fabricated using the method of phase-separation mediated by PAA-b-PAN-b-PAA tri-block copolymer. In the phase-separation procedure, the ionic block copolymer self-assembled on the surface of carbon nanofibers is used to adsorb NH4VO3. Thermal treatment at controlled temperatures in an NH3:N2 atmosphere led to the formation of vanadium nitride nanoparticles that are distributed uniformly on the nanofiber surface. By mediating the PAN to PAA-b-PAN-b-PAA ratio in the casting solution, a maximum specific capacitance of 240.5 F g-1 is achieved at the current density of 0.5 A g-1 with good rate capability at a capacitance retention of 72.1 % at 5.0 A g-1 in an aqueous electrolyte of 6 mol L-1 KOH within the potential range of -1.10 to 0 V (rN/A=1.5/1.0). Moreover, an asymmetric supercapacitor is assembled by using the hierarchical porous carbon fiber@vanadium nitride as the negative electrode and Ni(OH)2 as the positive electrode. Remarkably, at the power density of 400 W kg-1, the supercapacitor device delivers a good energy density of 39.3 Wh kg-1. It also shows excellent electrochemical stability, and thus might be used as promising energy-storage devices.

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Publication details

The article was received on 27 Nov 2017, accepted on 03 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7DT04432A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Nanocomposites Based on Hierarchical Porous Carbon Fiber@Vanadium Nitride Nanoparticles as Supercapacitor Electrodes

    F. Ran, Y. Wu, M. Jiang, Y. Tan, Y. Liu, L. Kong, L. Kang and S. Chen, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT04432A

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