High-surface-area activated carbon from pine cones for semi-industrial spray deposition of supercapacitor electrodes

Abstract

High surface area carbons are so far the best materials for industrial manufacturing of supercapacitor electrodes. Here we demonstrate that pine cones, abundant bio-precursor currently considered as a waste in...

A hierarchical integrated 3D carbon electrode derived from gingko leaves via hydrothermal carbonization of H3PO4 for high-performance supercapacitors

“…The maximum energy density can reach up to 70.78 W h kg −1 at a power density of 1.2 kW kg −1 , and a high energy density of 62.22 W h kg −1 can still be reached even at an ultrahigh output power density of 24 kW kg −1 , which is considerably higher than those of commercially activated carbon-based supercapacitors (3-5 W h kg −1 ) and other previously reported biomass-derived heteroatomdoped carbonaceous symmetric supercapacitors. [71][72][73] It is well known that the energy density is suppressed with the increase of current density since the limited pores on the surface are accessed by electrolyte ions for fast discharging at high current density, whereas almost all pores could be utilized at a low current density. Such superior energy/power characteristics can be ascribed to the optimized stacked architecture and tunable pore conguration of electrode materials as well as the enhancement of the transmission of K + and OH − ions inside the material.…”

Activated carbons with extremely high surface area produced from cones, bark and wood using the same procedure

“…The one step procedure results in materials with signicantly smaller surface area (<2000 m 2 g −1 ). 49,52 Using ethanol as solvent for KOH is justied by rapid evaporation and more homogeneous distribution of KOH in the powder biochar sample.…”

“…Recently we demonstrated that KOH activation tuned previously for preparation of “activated graphene” could be used to produce AC with similarly high BET SSA of about ∼3000 m 2 g −1 starting from pinecone biochar. 49 The pinecone AC showed similar to “activated graphene” pore size distribution and good performance in supercapacitor electrodes produced by both pellet forming and spray deposition 49 using aqueous dispersions. 50,51…”

Amino acid-driven adsorption of emerging contaminants in water by modified graphene oxide nanosheets

“…GO with a prominent number of holes and defects on the surface). 17,26–28 The number of carbonyl and carboxylic groups, mainly located at the defect edges, increased directly with the number of holes. 17…”

“…GO with a prominent number of holes and defects on the surface). 17,[26][27][28] The number of carbonyl and carboxylic groups, mainly located at the defect edges, increased directly with the number of holes. 17 The key role of surface chemistry in the adsorption properties is also proved by the studies of selectivity and efficiencies of functionalized graphene-based sorbents, in comparison with unmodified graphene.…”