Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Abstract

4357Reviews Scheme1.Classificationo fS Cs based on the charge-storage mechanism and type of active materials used in bothelectrodes. CDC = carbide-derived carbon, CNT = carbon nanotube.

Sulfur‐/Nitrogen‐Rich Albumen Derived “Self‐Doping” Graphene for Sodium‐Ion Storage

“…The porous structure and specific surfacea rea of Ni/NiS 2 /NSgraphene and NS-graphene were characterized by nitrogen adsorption-desorptionm easurements at 77 K. Figure 5s hows that Ni/NiS 2 /NS-graphenef eatures type Ia dsorption behavior characterized by am icro-and mesoporous nature.T he corresponding BET specific surface area, pore volume, and average pore size are calculated to be 491.58 m 2 g À1 ,3 .96 cm 3 g À1 ,a nd 4.20 nm, respectively.I ng eneral,c arbon materials obtained by direct pyrolysis of biomass normally possessarelativelyl ow surfacea rea,u nless other chemical treatments, for example, KOH etching, are included. [16] In this work, Ni/NiS 2 /NS-graphene with ah igh BET surface area was produced throughasimple meltingm ethod, with the aid of am olten salt, which is more attractive in terms of green chemistry.F or use as ab anode in SIBs, the porous structure and high surface area of Ni/NiS 2 /NSgraphene are expected to provide a3 Di nterconnected conductive network that facilitates charge transfer and leads to enhanced electrochemical performance.…”

Nanoarchitectured Design of Vertical‐Standing Arrays for Supercapacitors: Progress, Challenges, and Perspectives

“…Technically, heteroatom doping usually means substituting atoms in the substrate material with foreign elements or introducing foreign elements into interstitial voids. [ 68 ] The origin of the doping effect stands on the natural properties of dopants and the interaction between dopants and their coordination atom. As is pointed by Lee et al., the heteroatom dopants could bring in the improved adsorption of ions, which would benefit the volumetric capacitance.…”

Self‐template porous carbon by direct activation of high‐ash coal liquefaction residue for high‐rate supercapacitor electrodes

“…Among them, porous carbons with excellent physical and chemical properties have been widely developed and applied in supercapacitors. As known, micropores can contribute to large surface area and high capacitance performance; however, it would improve the resistance of electrolyte ions to diffusion across pores, while mesopores are beneficial for the transmission of electrolyte ions 16‐18 . In the issue, a carbon material with a hierarchical pore structure may be a standard high‐power electrode fiber with a high basic capacitance 19‐21 .…”