Biomass-derived ultrathin mesoporous graphitic carbon nanoflakes as stable electrode material for high-performance supercapacitors

By S. Sankar, Abu Talha Aqueel Ahmed, A. Inamdar, H. Im, Young Bin Im, Youngmin Lee, D. Kim, Sejoon Lee. Materials & Design (1980-2015), 2019

139 citations recorded by the source corpus.

Abstract With the motivation of materializing a high-performance electrode material for the high-energy supercapacitor, ultrathin mesoporous graphitic‑carbon was synthesized from biomass green-tea wastes via the KOH activation process combined with either of the water or the hydrochloric acid treatment. The water-treated graphitic‑carbon showed an interconnected ultrathin-nanoflake structure with a high porosity, while the hydrochloric acid-treated graphitic carbon exhibited an aggregated structure of irregular nanoparticles. The supercapacitor with an electrode of water-treated graphitic‑carbon nanoflakes displayed an enhanced specific capacitance of 162 F/g at 0.5 A/g. Furthermore, the device revealed an excellent cycle stability after multiple cyclic charge-discharge operations (i.e., 121% cyclic capacitance retention over 5000 cycles). These may open up a new avenue toward the recycling of biomass carbonaceous resources (e.g., green tea wastes) for inexpensive high-performance electrochemical energy-storage devices such as high-energy supercapacitors.

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

View Paper: https://www.semanticscholar.org/paper/bb58e14fcb8b4d6ccbcf8f21a403a68cf67cf74a