Control of the interface graphitized/amorphous carbon of biomass-derived carbon microspheres for symmetric supercapacitors

Abstract

Rational interface control of porous carbon electrode materials is of significance for efficient supercapacitors. Herein, biomass-derived carbon microspheres with highly graphitized porous surface and amorphous subsurface were well constructed via...

Biomass-derived porous carbon materials: synthesis, designing, and applications for supercapacitors

“…14g). 168 In detail, potato starch was immersed in (NH 4 ) 2 HPO 3 solution, and then freeze-dried. The cleaned starch was heated to 250 °C, followed by heating to 450 °C to obtain potato starch-derived carbon microspheres.…”

“…N functional groups with electron-donor properties can provide electroactive centres to enhance the electrical conductivity, surface polarity, and wettability of carbon by creating defects and changing the valence orbital energy levels 167 Biomass-derived carbon microspheres via a flexible coupled catalysis-activation process: (g) schematic, (h) SEM and (i) HRTEM images of GASC-Fe, ( j) SEM and (k) HRTEM images of GASC-Ni, (l) XRD and (m) Raman spectra. 168 of the carbon atoms, thereby enhancing the electrochemical reactivity. 171 In carbon materials, N elements are generally classified into four different types: pyridine nitrogen (N-6), pyrrolic/pyridone nitrogen (N-5), quaternary nitrogen (N-Q), and pyridine nitrogen oxide (N-X).…”

“…14 (a) SEM, (b) TEM, (c) XRD, (d) Raman spectra, (e) specific capacitances and (f ) Ragone plots of biomass graphitized porous carbon materials by K 2 FeO 4 as an activator and catalyst 167. Biomass-derived carbon microspheres via a flexible coupled catalysis-activation process: (g) schematic, (h) SEM and (i) HRTEM images of GASC-Fe, ( j) SEM and (k) HRTEM images of GASC-Ni, (l) XRD and (m) Raman spectra 168.…”

Boron and nitrogen co-doped carbon nanospheres for supercapacitor electrode with excellent specific capacitance

“…Recently, Wang et al [11] used glucose as a carbon precursor, porous carbon spheres were obtained through a mild hydrothermal process with a specific capacitance of 260 F g −1 at a current density of 0.5 A g −1 . Wang et al [12]. prepared porous carbon microspheres using renewable potato starch as raw material, and its specific capacitance reached 198 F g −1 when the current density was 1 A g −1 .…”