Journal
DIAMOND AND RELATED MATERIALS
Volume 107, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.107913
Keywords
Graphene quantum dots; Hydrothermal method; Electrochemical study; TEM
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Funding
- Department of Science & Technology, New Delhi under Women Scientist Scheme A (DST WOS-A) [SR/WOS-A/PM-107/2017]
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An efficient electrode material (Fe (II)S-GQDs) has been prepared by co-doping of sulfur and iron atoms with Graphene quantum dots. A top down synthesis method including a facile and one-pot hydrothermal was used to develop high capacity and good stability electrode material by selecting ferrous sulphate powder (FeSO4 center dot 7H(2)O) and graphene oxide (GO) as a precursor material. The results obtained from TEM measurements reveal the size alters from micrometer graphene sheets of GO to nano-meter dots for GQDs and Fe (II)S-GQDs. The electrochemical studies reveal that Fe(II) S doped GQDs can exhibit a reversible redox reaction with excellent specific capacitance of 476.2 F/g as compared to that of GQDs (143F/g). It has been found that there is an improvement in electrical conductivity and electron transfer in addition to the largest charge storage capacity. More remarkably, the doped electrode material shows a small charge transfer resistance (Rct) value (30 Omega) in case of Fe (II)S-GQDs as compared to GQDs (2.5 Omega) due to fast diffusion of ion and electron between working electrodes and electrolyte.
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