Microwave-assisted fabrication of high-performance supercapacitors based on electrodes composed of cobalt oxide decorated with reduced graphene oxide and carbon dots

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buir.contributor.authorOnses, M. Serdar
buir.contributor.orcidOnses, M. Serdar|0000-0001-6898-7700
dc.citation.epage104103-11en_US
dc.citation.spage104103-1en_US
dc.citation.volumeNumber49en_US
dc.contributor.authorYetiman, S.
dc.contributor.authorPeçenek, H.
dc.contributor.authorOnses, M. Serdar
dc.date.accessioned2023-02-24T06:35:39Z
dc.date.available2023-02-24T06:35:39Z
dc.date.issued2022-05
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractThis study presents microwave-assisted preparation of cobalt oxide (Co3O4) based nanocomposite electrodes doped with carbon dots and reduced graphene oxide. The calcination of the precursors at 400 °C for 2 h results in nanocomposites. A three-electrode cell in 2M KOH solution is used for the electrochemical measurements. The carbon dot containing electrodes enables the highest specific capacitance of 936 Fg−1 at 0.5 Ag−1 current density. Specific capacitances of pure Co3O4, and Co3O4@RGO electrodes are 448 Fg−1 and 482 Fg−1 at 0.5 Ag−1, with good rate capability even at 10 Ag−1, respectively. The cyclic stability of the electrodes is reasonably high and the electrodes retain 93%, 87%, and 88% of their initial capacitance after 10,000 cycles for Co3O4, Co3O4@RGO, and Co3O4@RGO@CDs, respectively. The optimized Co3O4@RGO@CDs electrodes were used to fabricate a symmetric supercapacitor that exhibits high specific capacitance (126 Fg−1 0.25 Ag−1) and long cycle life (%81 retention after 10,000 cycles). The fabricated supercapacitor has energy density of 17.5 Wh kg−1 and power density of 2522 W kg−1. The outstanding results demonstrate the promise of carbon dots doped transition metal oxides-based nanoparticles as promising electrodes for supercapacitor applications.en_US
dc.identifier.doi10.1016/j.est.2022.104103en_US
dc.identifier.eissn2352-1538
dc.identifier.issn2352-152X
dc.identifier.urihttp://hdl.handle.net/11693/111671
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttps://doi.org/10.1016/j.est.2022.104103en_US
dc.source.titleJournal of Energy Storageen_US
dc.subjectCarbon dotsen_US
dc.subjectElectrochemical studiesen_US
dc.subjectMetal oxideen_US
dc.subjectMicrowave irradiationen_US
dc.titleMicrowave-assisted fabrication of high-performance supercapacitors based on electrodes composed of cobalt oxide decorated with reduced graphene oxide and carbon dotsen_US
dc.typeArticleen_US
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