Peanut-Shell-like Porous Carbon from Nitrogen-Containing Poly-N-phenylethanolamine for High-Performance Supercapacitor

Abstract

An efficient soft-template method is proposed for the synthesis of peanut shell-like porous carbon as high-performance supercapacitor electrode materials. The procedure is based on the pyrolysis and chemical activation processes using N-phenylethanolamine as precursor and KOH as activation agent. In a three-electrode system, the resultant carbon material has a specific capacitance of 356 F g(-1) at 1 A g(-1) and a good stability over 1000 cycles. Besides, at a high current density of 30 A g(-1), it has a specific capacitance of 249 F g(-1) and maintains 96% after 10,000 cycles. In two-electrode cell configuration, it delivers about 21.53 Wh kg(-1) at a current density of 20 A g(-1), which is about 7 times higher than the commercial device (<3 Wh kg(-1)). Both high specific capacitance and excellent cycling stabilities guarantee its utilization in supercapacitors.

Oil tea shell derived porous carbon with an extremely large specific surface area and modification with MnO2 for high-performance supercapacitor electrodes

“…The AC (used for this project) was derived from bio-waste oil tea shells from China, it had a very large surface area (>2800m 2 /g), a high pore volume (>2.5cm 3 /g), and high CO 2 adsorption uptakes (3.61mmol/g at 1bar, 25°C). The capacitance was 146 F/g (@0.5A/g, 1M KOH solution), which is in the normal range of AC (20F/g~ 300F/g) 9 , but smaller than most of the recently reported results 6,[26][27][28] . Hereby, we took the advantage of large surface areas of AC to adsorb the MnO 2 particles directly on the surface forming a thin filmlike coating.…”

Carbon Dots/NiCo2O4Nanocomposites with Various Morphologies for High Performance Supercapacitors

“…It is well known that the common advantages of the typical supercapacitor electrode materials include high power density, excellent coulomb efficiency, low maintenance cost, and long lifespan . But in comparison with those battery electrode materials, the supercapacitor electrode materials always fail in the lower energy density because their energy storage is limited on the electrode surfaces in form of the double layer capacitance.…”

Large area few-layer graphene with scalable preparation from waste biomass for high-performance supercapacitor

“…Currently, new technologies for the applications of supercapacitors are under challenging research since the performance of the device strongly depends on mechanical strength, surface area, porosity and the production cost of the active electrode materials. Carbonaceous materials including CNTs, activated carbon and their derivatives are setting benchmarks in this flourishing field of supercapacitors, due to their natural biocompatibility, chemical stability, mechanical strength, high conductivity, large surface area and therefore evidently an innate ability to store charges 28 – 31 . However, most of these materials face a major drawback regarding low energy density (5–8 W h Kg −1 ), low specific capacitance and dynamically poor electronic conductivity 32 .…”