NiWO4/Ni/Carbon Composite Fibres for Supercapacitors with Excellent Cycling Performance

Abstract

A novel NiWO 4 /Ni/carbon fibre composite was fabricated by the combination of electrospining with spray deposition and subsequent carbonization. It was revealed that NiWO 4 and Ni were uniformly dispersed outside and inside the carbon fibres, respectively. Used as supercapacitor electrode, the as-prepared fibre composite shows excellent capacity and cyclability. Galvanostatic discharge/charge test showed that the specific capacitance sharply increased from 151.1 to 792.2 F g −1 at 5 A g −1 after 1500 cycles, which was attributed to the oxidation of metallic Ni into ionic Ni 2+ forming more reactive sites. An electrochemical asymmetric supercapacitor was assembled using the composite fibres and porous carbon nanofibers, of which the energy density increased from 32.5 to 41.3 Wh kg −1 at 193.8 W kg −1. The results clearly showed that NiWO 4 /Ni/carbon fibre material is of potential in energy harvesting and storage.

Biomass Based Materials in Electrochemical Supercapacitor Applications

“…Biomass is a very low cost carbon source and is used in the production of high value carbon nanomaterials [1][2][3]. While biochar, activated carbon and mesoporous graphite come first among these materials, when advanced processes are applied, graphene, graphene oxide, carbon nanotubes, carbon-based nanostructures and even hybrid nanostructures containing metalloxide can be successfully produced (Figure 1) [13][14][15][16][17][18].…”

“…In particular, biochar, activated carbon and porous carbon production from biomass and their various applications were very popular [16][17][18][19][20][21]. In one of these studies biochar is synthesized from hair and then activated charcoal without any chemical treatment [19].…”

“…For this reason, new generation composite carbon structures originating from biomass were developed, and materials with superior thermal and electrical conductivity and good chemical and environmental stability were developed [22][23][24]. Later, graphene, graphene-like nano-layers were developed from structures such as activated charcoal obtained from biomass, whose pore structure progressed in a stable pattern with good electrical conductivity, and whose pore structure did not differ [16][17][18][19][20][21][22]. Also, Wang et al [25] reported that the microwave plasma beam method can be utilized to create graphene CNT hybrids.…”

Agar Hydrogel Template Synthesis of Mn3O4 Nanoparticles through an Ion Diffusion Method Controlled by Ion Exchange Membrane and Electrochemical Performance

“…Pseudocapacitors can achieve energy storage and release through highly reversible adsorption/desorption processes or fast redox reactions of the electrode active materials in the electrolyte. As the electrochemical reactions of pseudocapacitors occur both on the surface and inside of electrode, the energy density and specific capacitance of pseudocapacitors are usually much higher than that of other electrochemical capacitors [7,8].…”

Solvothermal synthesis of NiWO4 nanostructure and its application as a cathode material for asymmetric supercapacitors

“…20 Carbon bre was used to synthesized 3D structure of NiWO 4 /Ni/carbon bre composite by combination of electrospinning with spray deposition and subsequent carbonization, which showed excellent capacity and cyclability. 29 Although much progress has been made recently, the rational construction of NiWO 4 with tailored architecture with high electrons/ions mobilities still remains to be the major research topic for sake of obtaining desired applicational performances. In this work, ethylene glycol was used to fabricate nanostructures by forming glycolate precursors because of its coordination interaction with transition metal ions.…”