Formation of nitrogen-doped holey carbon nanosheets via self-generated template assisted carbonization of polyimide nanoflowers for supercapacitor

Rich Oxygen‐Containing Carbon Microparticles Derived from Self‐Assembled Polyimides for High‐Performance Supercapacitors

“…These characteristic absorption bands imply that the imidization reaction of PAA has occurred during solvothermal process. [33][34][35][36] After thermal rearrangement at 450 C, the intensities of special absorption peaks significantly decrease. Furthermore, the characteristic bands of organic groups of carbon microparticles mostly disappear after high-temperature thermal decomposition.…”

“…Furthermore, a tremendous amount of microporous and mesoporous structures are produced, which are beneficial to increase the contact area with electrolyte and improve electrochemical performance of carbon materials. [ 33–40 ] Although the morphology, specific surface area and electrochemical performance of 3D carbon materials could be adjusted by the concentration of precursor poly(amic acid) (PAA), solvent, temperature, and time of thermal treatment, the carbon materials obtained by direct pyrolysis usually show lower specific capacitance. Therefore, activation treatment of carbon materials is often used to further enhance their porosity and specific surface area.…”

“…The 3D carbon materials derived from self-assembled polyimides (PIs) have recently been reported as electrode materials, with more active positions, large specific surface areas, and various nitrogen-doped forms, including pyridine nitrogen, pyrrole nitrogen, and graphite nitrogen. [33][34][35] Under high temperature and pressure, the PI microparticles are composed of many 2D nanoscale layers, leading to a large number of cavities or gaps between the layers. [36][37][38] The self-assembly of PIs is a bottomup crystallization process, involving the folding of macromolecular chains and stacking of layered structures.…”

“…Furthermore, a tremendous amount of microporous and mesoporous structures are produced, which are beneficial to increase the contact area with electrolyte and improve electrochemical performance of carbon materials. [33][34][35][36][37][38][39][40] Although the DOI: 10.1002/ente.202100305 Novel porous carbon microparticles derived from self-assembled polyimides (PIs) were prepared via a facile solvothermal strategy, followed by thermally rearranged treatment and pyrolysis process. Without additional activation, the carbon microparticles exhibited large specific surface areas and abundant oxygen and nitrogen contents.…”

Biomass-derived O, N-codoped hierarchically porous carbon prepared by black fungus and Hericium erinaceus for high performance supercapacitor

“…13,14 Although the low energy density and the low theoretical specic capacitance, these carbon-based materials including activated carbon, carbon nanotubes, graphene, carbon nanober, porous carbon and their derivatives exhibit excellent performance such as good conductivity, high thermal stability, high specic surface area, meanwhile the low cost and abundant resources of carbon have attracted many researchers concentrating on new carbon materials. [15][16][17][18][19] Biomass materials have been widely selected as precursors to fabricate porous carbon materials with different morphologies for supercapacitors. 20 These biomass materials include rapeseed dregs, 21 loofah sponge, 22 willow catkin, 23 shiitake mushroom, 24 potato starch, 25 bamboo char, 26 bacterial cellulose, 27 walnut shell, 28 tobacco rods, 29 corn grain, 30 rice husk, 31 osmanthus ower, 32 peanut shell, 33 sunower seed shell, 34 corncob, 35 cornstalk, 36 etc.…”