Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6470796 | Electrochimica Acta | 2017 | 29 Pages |
Abstract
This paper discussed in details the impact of binder polyvynilidene fluoride (PVDF) concentrations (5, 10 and 20 wt%) and pressures (â¼382 â¼Â 891 â¼Â 1783 and â¼2547 MPa) for the fabrication of electrodes based on Carbon nanofibers (CNFs) for supercapcitors. The surface area, pore size distribution and morphology were characterized by Brunauer-Emmett-Teller (BET) method and SEM. The decrease in specific surface area was about 31% and pore volume 14.6% with increase in PVDF concentration from 5 to 20 wt% at â¼891 MPa pressure. The assembled electrodes were tested with two electrode system in aqueous electrolyte. The specific capacitance was 80 F/g for lowest concentration of PVDF (5 wt%) and decreased about 28.3% with increase concentrations at same pressure â¼891 MPa. In comparing the effect of pressure on specific capacitance, it increases about 38% for (PVDF, 10 wt%; pressure â¼1783 MPa) from (PVDF, 10 wt%; pressure â¼891 MPa); their corresponding power density 24502 W/kg at energy density of 6.8 Wh/Kg and 19886 W/kg at energy density energy of 3.8 Wh/kg. ESR values increase from 0.3 to 1.9 Ω with increase in PVDF concentration and decrease again to 0.5 Ω with increase in pressure. The results show optimal conditions are 10 wt% of PVDF and higher pressure of â¼891 MPa.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Allan Daraghmeh, Shahzad Hussain, Llorenç Servera, Elena Xuriguera, Albert Cornet, Albert Cirera,