Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2016-12-20

Journal: ELECTROCHIMICA ACTA

Included Journals: Scopus、EI、SCIE

Volume: 222

Page Number: 446-454

ISSN: 0013-4686

Key Words: carbon fibres; supercapacitor; nickel tungsten tetraoxide

Abstract: A novel NiWO4/Ni/carbon fibre composite was fabricated by the combination of electrospining with spray deposition and subsequent carbonization. It was revealed that NiWO4 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 792.2Fg(-1) at 5 Ag-1 after 1500 cycles, which was attributed to the oxidation of metallic Ni into ionic Ni2+ 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 NiWO4/Ni/carbon fibre material is of potential in energy harvesting and storage. (C) 2016 Elsevier Ltd. All rights reserved.