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High efficiency supercapacitor derived from biomass based carbon dots and reduced graphene oxide composite
Ist Teil von
Journal of electroanalytical chemistry (Lausanne, Switzerland), 2019-01, Vol.832, p.87-96
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Biomass-derived carbon dots (CDs) were prepared via a green one-step synthetic technique using cauliflower leaf wastes as natural carbon precursor. The as-prepared CDs were used to fabricate composites with reduced graphene oxide (RGO) via a one-step hydrothermal treatment. The electrochemical performance of the electrodes was investigated with variable GO to CD mass ratios. The RGO/CD composite with a 2:1 mass ratio (RC-21) exhibited high specific capacitance with maximum discharge capacitances of 278 F g−1 and 227 F g−1 at 0.2 A g−1 and 2 mV s−1, respectively, together with excellent capacitance retention of 60% when the current density increased from 0.2 to 100 A g−1 and 63% with scan rate rise from 2 to 1000 mV s−1, respectively. The results are discussed in terms of the composition, surface area, pore volume, electrical conductivity and proton diffusivity.
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•Carbon dots derived from waste biomass via green one-step synthesis•CD/RGO composite produced by facile one-pot hydrothermal chemical-free process•Supercapacitance enhanced by surface area, porous structure and pseudocapacitance from nitrogen heteroatoms•Charge storage mechanism explained by electrical double layer, pseudocapacitance and ionic diffusivity