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Novel Hybrid Nanoparticles of Vanadium Nitride/Porous Carbon as an Anode Material for Symmetrical Supercapacitor.

ABSTRACT:

Abstract

Hybrid materials of vanadium nitride and porous carbon nanoparticles (VN/PCNPs) were fabricated by a facile pyrolysis process of vanadium pentoxide (V₂O₅) xerogel and melamine at relatively low temperature of 800 °C for supercapacitor application. The effects of the feed ratio of V₂O₅ to melamine (r), and nitrogen flow rate on the microstructure and electrochemical performance were also investigated. It was found that the size of the as-synthesized nanoparticles is about 20 nm. Both r value and N₂ flow rate have enormous impacts on morphology and microstructure of the nanoparticle, which correspondingly determined the electrochemical performance of the material. The VN/C hybrid nanoparticles exhibited high capacitive properties, and a maximum specific capacitance of 255.0 F g^-1 was achieved at a current density of 1.0 A g^-1 in 2 M KOH aqueous electrolyte and the potential range from 0 to -1.15 V. In addition, symmetrical supercapacitor fabricated with the as-synthesized VN/PCNPs presents a high specific capacitance of 43.5 F g^-1 at 0.5 A g^-1 based on the entire cell, and an energy density of 8.0 Wh kg^-1 when the power density was 575 W kg^-1. Even when the power density increased to 2831.5 W kg^-1, the energy density still remained 6.1 Wh kg^-1.

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SUBMITTER: Yang Y

PROVIDER: S-EPMC6223780 | biostudies-literature |

REPOSITORIES: biostudies-literature

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