Ultrahigh surface area biomass derived 3D hierarchical porous carbon nanosheet electrodes for high energy density supercapacitors

By A. Selvaraj, Anand Muthusamy, Inho-Cho, Hee-jee Kim, K. Senthil, K. Prabakar. 2021

223 citations recorded by the source corpus.

Abstract A simple one step activation method is used to achieve an ultra-high specific surface area of 2943 m2 g−1, and abundant pore volume of 1.83 cm3 g−1 with a rational micro/meso/macro pore size distributed activated carbon nanosheets from Prosopis Juliflora wood carbon waste blocks. A superior electrochemical performance has been achieved with a specific capacitance of 588 Fg-1 at 0.5 A·g−1 with an excellent stability (retention 92.5% after 6000 cycles) in 6 M KOH electrolyte for a three-electrode approach. The assembled symmetric supercapacitor device outperformed in a neutral aqueous electrolyte compared to an alkaline electrolyte, such as with a gravimetric capacitance of 403 and 426 F g-1 and superior energy density of 32.9 W h kg-1 (at 172.7 W Kg-1) and 56.7 W h kg-1 (at 248.8 W Kg-1), and a large electrochemical window of 0 -1.4 V in 6M KOH and 0 - 2 V in 1 M Na2SO4 electrolyte, respectively. The electrochemical performance has been enhanced by the degree of graphitization, surface functional groups, surface area and pore structure/volume. This work provides a trustworthy approach to produce higher energy density devices from renewable biomass carbon wastes for various energy storage applications.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/e5a2008b5e17b79aa30c0d2777a4a9c0ab82cd80