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

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.Graphical Abstract Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-016-0105-5) contains supplementary material, which is available to authorized users.

Hierarchically Macroporous Graphitic Nanowebs Exhibiting Ultra-fast and Stable Charge Storage Performance

“…Therefore, surface-induced charge storage performances can be improved in HM-GNWs, showing exceptionally high rate capabilities and cycling stabilities by sweep rates of 100 V s −1 and 1,000,000 cycles, respectively. The rate and cycling performances of HM-GNWs surpass them of other similar carbonbased electrode materials for supercapacitors [18][19][20][21][22][23][24][25].…”

An Eco‐Friendly Nitrogen Source for the Preparation of Vanadium Nitride/Nitrogen‐Doped Carbon Nanocomposites for Supercapacitors

“…In Figure b, the specific capacitance valves of 0.06‐VN/NCS2, 0.04‐VN/NCS2, 0.03‐VN/NCS2, NCS2 and commercial VN electrodes calculated from the GCD curves at a current density of 1 A g −1 were 137 F g −1 , 299 F g −1 , 187 F g −1 , 28 F g −1 and 16 F g −1 , respectively, which was agreed with the results of the CV curves. It should be noted that the specific capacitance of the 0.04‐VN/NCS2 electrode is much higher than those of the reported vanadium nitride or carbon‐based electrodes (see Table ).…”

A facile strategy for the synthesis of graphene/V2O5 nanospheres and graphene/VN nanospheres derived from a single graphene oxide-wrapped VOx nanosphere precursor for hybrid supercapacitors

“…In recent years, vanadium nitride (VN) holds considerable promise as negative electrode materials for HSCs because of its versatile merits including high theoretical-specic capacitance (1340 F g À1 ) and outstanding electrical conductivity (1.67 Â 10 4 U À1 cm À1 ) compared with its corresponding oxides. [20][21][22] Furthermore, VN has high hydrogen evolution potential in aqueous solution, which can deliver a wide working window in negative potential for HSCs. 23 Unfortunately, the morphology of pristine VN commonly consists of accumulational nanoparticles with weak interconnection, which affect the electronic conductivity and restrict the ionic conductivity.…”