Itive nature frequency-dependent HPC6 is -50 suggesting a improved EDL-dominatedis shown that the for HPC8. It really is shown impedance decreases with the boost in frequency for the boost in frequency for all that the frequency-dependent impedance decreases withall samples (Figure 5d). Generally, HPC8 possesses a reduce impedance compared decrease impedance compared with HPC6, samples (Figure 5d). Generally, HPC8 possesses a with HPC6, which is valuable for ionicNanomaterials 2021, 11, 2838 PEER Overview Nanomaterials 2021, 11, x FORof 99 ofwhich is helpful for ionic Aztreonam Protocol diffusion in the electrolyte to porous fantastic supercapacitive diffusion in the electrolyte to porous electrode, resulting within a electrode, resulting within a very good supercapacitive efficiency for HPC8. overall performance for HPC8.Figure 5. (a) Nyquist plot, frequency dependence of (b) capacitance, (c) phase angle and (d) |Z| for Figure five. (a) Nyquist plot, frequency dependence of (b) capacitance, (c) phase angle and (d) |Z| for HPCs in H2SO4 electrolyte. HPCs in H SO electrolyte.2As for P-doped carbons, it was reported that the active oxidation sites on the surface of porous carbon might be blocked by phosphate functionalities, resulting in an operation blocked by phosphate functionalities, an operation potential greater than 1.5 V. Thinking about that HPC8 using a reasonably higher P content Polmacoxib supplier material shows V. Thinking of that HPC8 with somewhat high an ideal supercapacitive performance in H22SO4 electrolyte, an HPC8-based symmetric supercapacitive performance in H 4 HPC8-based symmetric supercapacitor was assembled and tested below the operation potentials 1 1 and 1.5 V supercapacitor was assembled and tested beneath the operation potentials ofof and 1.5 V in in 1 M aqueous H SO4 electrolyte. The Nyquist the for the HPC8-based symmetric 1 M aqueous H2SO42electrolyte. The Nyquist plot forplot HPC8-based symmetric supercasupercapacitor (Figure S10) low internal resistance of 1 . of curves (Figure (Figure 6a) pacitor (Figure S10) shows ashows a low internal resistanceCV 1 . CV curves6a) at a low at a low operation show a pair of a pair of redox peaks, the energy the energy storage operation possible possible showredox peaks, suggestingsuggesting storage mechanism mechanism of EDL and pseudocapacitance, which is generated by the redox reaction beof EDL capacitance capacitance and pseudocapacitance, which is generated by the redox reaction and surface functionalities [32]. On the other hand, the absence of redox peaks for CV tween Hbetween H and surface functionalities [32]. However, the absence of redox peaks for CV curves (Figures 6a and S11a) measured below a 1.5 V operation window window curves (Figures 6a and S11a) measured under a 1.five V operation potentialpotential suggests suggests that capacitance dominated the power power mechanism beneath beneath higher that the EDL the EDL capacitance dominated the storage storage mechanism such a such a higher operation prospective window. The overlapped GCD curves (Figures 6b measured operation potential window. The overlapped GCD curves (Figures 6b and S11b) and S11b) measured at diverse potentials reveal a reveal a superb reversibility for HPC8. The power at distinctive operation operation potentialsgood reversibility for HPC8. The power density density for the 1.five V supercapacitor can reach as much as kg-1 which-1 that is much bigger for the 1.five V supercapacitor can reach as much as 16.four Wh 16.4 ,Wh kg is, a lot bigger than that than that (six Wh kg-1 with the 1 V supercapacitor. with th.
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