Fig 1

Preparation methods of SiC nanomaterials. (a) Template method18, (b) CVD method19, (c) electrostatic spinning method37, (d) 3D printing41. (a–d) Adapted from Elsevier publisher."

Fig 2

Preparation methods of SiC derived carbon. (a) High temperature halogen etching44, (b) supercritical hydrothermal synthesis46, (c) high temperature molten salt electrochemical etching52. (a) Adapted from Elsevier publisher. (b) Adapted from Elsevier publisher. (c) Adapted with permission from Royal Society of Chemistry."

Fig 3

SiC nanospheres, SiC nanofibers and SiC nanowires based electrode materials for electric double-layer capacitors. (a) Schematic illustration of the synthetic procedure, (b) galvanic charge-discharge (GCD) curves in 6 mol∙L−1 KOH solution of MHS-SiC57; (c) schematic illustration of fabrication process of SiC nanofibers (insets are scanning electron microscope (SEM) image and charge/discharge curves of SiC nanofibers in 1 mol∙L−1 KOH at 1 A∙g−1)59; (d) schematic illustration of fabrication process, (e) electrochemical performance of a flexible, all-solid-state of N-SiCNWs nanoarray61; (f) schematic illustration of fabrication process, (g) the designed electrode, (h) Ragone plot in 2 mol∙L−1 KCl of SiC@C nanowire arrays62. (a, b) Adapted with permission from Royal Society of Chemistry. (c) Adapted from Elsevier publisher. (d, e) Adapted with permission from American Chemical Society. (f–h) Adapted from Elsevier publisher."

Fig 4

Wide temperature domain SiC nanowire based electrode materials for electric double-layer capacitors. (a) Schematic illustration, (b) SEM image, (c) cyclic voltammetry (CV) curves at 100 mV∙s−1, (d) cycling stability test at 200 mV∙s−1 of SiC nanowires (SiCNWs)/YSZ/SiCNWs device65; (e) schematic illustration of supercapacitor construction, (f) SEM image, (g) digital photographs of flat and multi-folded supercapacitor, (h) capacitance retention of the soft-packaged supercapacitor bent at different angles, (i) CV curves at 50 mV∙s−1 with 1-butyl-3-methylimidazolium tetrafluoroborate as the electrolyte of SiC/CNT composite66. (a–d) Adapted with permission from American Chemical Society. (e–i) Adapted with permission from Royal Society of Chemistry."

Fig 5

SiC nanocrystalline film, SiC nanosheet, three dimensional SiC "nanoforest" based electrode materials for electric double-layer capacitors. (a) Transmission electron microscope (TEM) image of nanocrystalline SiC films67; (b) schematic ilustration of the mechanism, (c) CV curves in 1 mol∙L−1 Na2SO4 of 3C/2H-SiC/C nanosheets70; (d) SEM imagines, (e) schematic illustration of stable framework and continuous electron pathways, (f) cycling performance of charge-discharge at 100 μA∙cm−2 in 0.5 mol∙L−1  H2SO4 of 3C-SiC/graphene "nanoforest" films71. (a) Adapted with permission from American Chemical Society. (b, c) Adapted from Elsevier publisher. (d–f) Adapted from Elsevier publisher."

Fig 6

SiC nanomaterials combined with pseudocapacitance materials based composite electrodes. (a) Schematic illustration of flexible supercapacitor based on SiC/N doped bio-renewable carbon material72; (b) electrochemical performance diagram, (c) SEM image, (d) CV curves using polyvinyl alcohol (PVA)-KOH gel electrolyte in different bending states of carbon cloth (CC)/SiCNWs@NiCo2O4 nanosheets arrays/CC/SiCNWs@C nanosheets arrays device78; (e) schematic illustration of fabrication process on carbon cloth, (f) SEM image, (g) high-magnification TEM image of SiCNWs@NiCo2O4/NiO nanosheets81; (h) schematic illustration of the designed free-standing electrode (inset is the SEM image), (i) GCD curves in 2 mol∙L−1 KCl of SiC@PEDOT nanowires87. (a–d, h–i) Adapted from Elsevier publisher. (e–g) Adapted with permission from American Chemical Society."

Table 1

Performance of different SiC-based electrode materials for supercapacitors."

Fig 7

Porous structure design of SiC-CDC. (a) Schematic illustration of the fabrication process, (b) SEM images, (c) Ragone plot of CDC with aligned mesopores99; (d) Schematic illustration of the preparation procedure, (e) SEM images, (f) GCD curves in 6 mol∙L−1 KOH of SiC-derived carbon nanofibers100. (a–c) Adapted with permission from American Chemical Society. (d–f) Adapted from Elsevier publisher."

Fig 8

Activated and doped SiC-CDC electrode materials. (a) TEM image101; (b) Pore size distribution of additionally CO2 activated SiC-CDC102; (c) Schematic illustration of the planar microsupercapacitor structure of graphitizing nitrogen-doped poly-SiC films107. (a) Adapted from Elsevier publisher. (b) Adapted from Electrochemical Society publisher. (c) Adapted from IEEE publisher."

Fig 9

Graphene/SiC-CDC composites as electrode materials. (a) SEM images, (b) CV curves in in 6 mol∙L−1 KOH, (c) Long-term cyclic charge/discharge test at 1 A∙g−1 of G/ACDC109. (d) Schematic illustration of synthesis process, (e) Nyquist plots, (f) Specific capacitance in 3.5 mol∙L−1 KCl of rGO and rGO-CDC films110. Adapted from Elsevier publisher."

Fig 10

SiC-CDC@NC composites as electrode materials. (a) Schematic illustrations of the synthesis process of CDC@NC, (b) Schematic illustrations and (c) TEM images of the conversion process from SiC to CDC@NC, (d) CV curves, (e) Specific capacitance comparison, (f) Coulombic efficiency and cycling performance at 0.5 A∙g−1 in 6 mol∙L−1 KOH solution of CDC@NC112. Adapted from Elsevier publisher."