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Electrochem 2021, 2 240 materials. Furthermore, these electrodes work over a wide potential range (−1.4 to +0.5) in an aqueous KOH electrolyte (Figure 1), thereby opening a new avenue to produce a high-performance symmetrical supercapacitor. Moreover, they have shown that the as-assembled symmetrical device exhibited an energy density up to 31.1 W h kg−1 at a power density of 476.0 W kg−1 while demonstrating exceptional stability (94.2%). The superior performance of the above device among contemporary devices was attributed to the amorphous carbon/cobalt phosphate composite and additional doping of P. Another Electrochem 2021, 2, FOR PEER REVIEW 5 report also suggested that doping P in amorphous materials can widen the working potential window, thereby increasing the energy density of the device [69]. −1 Figure 1. CV curves of a-PC@CoPi-CC8 within different potential windows at 50 mV ss (a),, GCD curves of the same sample at different current densities at potential ranges from −1.4 to 0.5 (b). CV profiles of a symmetric supercapacitor sample at different current densities at potential ranges from −1.4 to 0.5 (b). CV profiles of a symmetric supercapacitor (SSC) and a double SSC (DSSC) assembled from a-PC@CoPi-CC8 and collected at 50 mV s−1 (c), and GCD curves of the (SSC) and a double SSC (DSSC) assembled from a-PC@CoPi-CC8 and collected at 50 mV s −1 (c), and GCD curves of the −2 SSC and DSSC devices collected at 20 mA cm −(2d). Inset is the image of a red light-emitting diode (LED) powered by two SSC and DSSC devices collected at 20 mA cm (d). Inset is the image of a red light-emitting diode (LED) powered by SSCs in series. The supercapacitor devices were charged for approximately 40 s before the LED tests. Reprinted with two SSCs in series. The supercapacitor devices were charged for approximately 40 s before the LED tests. Reprinted with permission [58]. permission [58]. 4. Electrospun-Based Fibers as Negative Electrode Materials for Supercapacitors 4. Electrospun-Based Fibers as Negative Electrode Materials for Supercapacitors Currently, electrospun carbon nanofibers (ECNFs) have appeared as a promising ma- Currently, electrospun carbon nanofibers (ECNFs) have appeared as a promising terial for electrochemical energy storage [32,38,59]. Most importantly, electrospun fibers material for electrochemical energy storage [32,38,59]. Most importantly, electrospun can be produced with a simple machine in a laboratory setting, unlike the need for a com- fibers can be produced with a simple machine in a laboratory setting, unlike the need for paacnoymspeatnuypsetot upprotdoupcreodcaurcbeocnarcblotnh.clCoNthF.sCcNanFsbceanfaberifcabterdicabtyedthbeyctohset-ceoffset-cetifvfectainvde caonndvceonnievnetneielenctreolespctirnonsipnignnoifnogrgoafnoircgpaonliycmpeorlys mfoellroswfoeldlobwyecdarbbyocnaizrbatoinoinza[7ti0o–n72[]7.0E–l7e2c]-. tErloescptirnonspiningnisinagmiseathmodetfhoordthfoerfathcielefafcaiblreicfabtiroincaotfionanofofnibanerosfiubnedrserutnhdeeirntfhlueeincfeluoefnacne eoxftaenrneaxltelrencatlrieclefcietlrdic. fIiteladll.oIwt aslltohwe sfatbhreicfatbiorincaotifocnoonfticnounotuinsufoibuesrsfibweirtshwniatnhon-atnoom- tio- croscale diameters [73–75]. In 1887, C. V. Boys showed that fibers could be produced from a viscoelastic liquid in the presence of an external electric field [76]. In 1902, J. F. Cooley and J. Martin filed patents for a prototype setup for electrospinning [71]. In 1964–1969, Geoffery Taylor reported a mathematical model for the formation of a Taylor cone from a spherical solution droplet under the influence of an external electrical field [77–79]. After the 1990s, various organic polymers were demonstrated to form nanofibers, and, after thePDF Image | Review of Electrospun Carbon Nanofiber-Based Negative Electrode Materials
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