Natural bio-waste-derived 3D N/O self-doped heteroatom honeycomb-like porous carbon with tuned huge surface area for high-performance supercapacitor

Chemosphere. 2024 Aug:361:142400. doi: 10.1016/j.chemosphere.2024.142400. Epub 2024 May 22.

Abstract

Supercapacitor electrodes (SCs) of carbon-based materials with flexible structures and morphologies have demonstrated excellent electrical conductivity and chemical stability. Herein, a clean and cost-effective method for producing a 3D self-doped honeycomb-like carbonaceous material with KOH activation from bio-waste oyster shells (BWOSs) is described. A remarkable performance was achieved by the excellent hierarchical structured carbon (HSC-750), which has a large surface area and a reasonably high packing density. The enhanced BWOSs-derived HSC-750 shows an ultrahigh specific capacitance of 525 F/g at 0.5 A g-1 in 3 M KOH electrolyte, as well as high specific surface area (2377 m2 g-1), pore volume (1.35 cm3 g-1), nitrogen (4.70%), and oxygen (10.58%) doping contents. The SCs also exhibit exceptional cyclic stability, maintaining 98.5% of their capacitance after 10,000 charge/discharge cycles. The two-electrode approach provides a super high energy density of 28 Wh kg-1 at a power density of 250 W kg-1 in an alkaline solution, with remarkable cyclability after 10,000 cycles. The study demonstrates the innovative HSC synthesis from BWOSs precursor and cost-effective fabrication of 3D N/O self-doped heteroatom HSC for flexible energy storage.

Keywords: 3D honeycomb-like porous carbon; Bio-waste oyster shells; Self-doped O/N heteroatom; Supercapacitor.

MeSH terms

  • Animals
  • Carbon* / chemistry
  • Electric Capacitance*
  • Electric Conductivity
  • Electrodes*
  • Nitrogen* / chemistry
  • Ostreidae / chemistry
  • Oxygen / chemistry
  • Porosity

Substances

  • Carbon
  • Nitrogen
  • Oxygen