Boosting the supercapacitor performance of activated carbon by constructing overall conductive networks using graphene quantum dots

Abstract

The capacitive energy storage performance of activated carbon can be significantly improved by embedding graphene quantum dots owing to the formation of overall conductive networks.

Multilayer carbon materials prepared from Zanthoxylum schinifolium husk for high-performance supercapacitors

“…By changing the KOH dosage, we obtained carbon materials with different pore structures and nitrogen contents. [18][19][20] Compared with the traditional carbon materials, [21][22][23] our work demonstrates the following advantages: (1) carbon has abundant pore and open layer structures. Uniform and interconnected pore structures endow plentiful active sites and shorten the ion diffusion length remarkably, facilitating the ion transport and storage in electrode materials.…”

Sustainable Porous Carbon with High Specific Surface Area from Soybean Shell via Hydrothermal Carbonization with H3PO4 for Electric Double‐Layer Capacitor Applications

“…The high SSA could provide storage space for ions and enhance electrochemical performance. Some amount of mesopores could improve the ion transport to the electrode materials . As the pore size distribution (Figure b) displays, the pore of PCs consists of mainly micropores (0.6–2 nm) and some mesopores (5–50 nm).…”

High‐efficiency utilization of carbon materials for supercapacitors

“…[64,65] In this process, the uniformly distributed metal ions in carbon precursors can ensure high-efficiency conversion of the sp 3 -C to sp 2 -C. With the discovery of sp 2 nanocarbon, the carbon precursors (such as polymer, pitch, biomass) mixed or in situ hybrid with various dimensional carbons (2D graphene, 1D carbon nanotubes or nanofibers, and 0D carbon quantum dots), have been considered as a promising strategy to construct highly conductive networks in the carbon matrix. [66][67][68] We previously used 1D bacterial cellulose (BC) as both template and precursor for the synthesis of nitrogen-doped carbon networks through the carbonization of polyaniline (PANI) coated BC (denoted as a-CBP).…”

“…Even at a high mass loading of 15 mg cm −2 , the capacitance still reached high values of 4.17 and 2.44 F cm −2 at 1 and 5 A g −1 , respectively. [68]…”