4.7 Article

Energy storage of supercapacitor electrodes on carbon cloth enhanced by graphene oxide aerogel reducing conditions

Journal

JOURNAL OF ENERGY STORAGE
Volume 32, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.est.2020.101839

Keywords

Composite electrodes; Reduced graphene oxide aerogel; Carbon cloth; Carbon nanotubes; Supercapacitors

Categories

Funding

  1. national funds, through FCT - Fundacao para a Ciencia e a Tecnologia [57/2016, UID/EMS/00481/2019-FCT]
  2. Centro 2020, through the European Regional Development Fund (ERDF) [CENTRO-01-0145-FEDER-022083]
  3. Short-Term Scientific Mission (STSM) grant at CNR-ITAE of Messina [CA15107]
  4. national funds through the FCT/MCTES [UIDB/50011/2020, UIDP/50011/2020]
  5. FEDER

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Supercapacitor performance can be enhanced when the specific capacitance of its electrodes is increased by the electrode fabrication parameters, composition, and structure. The electrode application range can be enlarged from supercapacitors to triboor piezogenerators as a part of self-charging power cell for one-step energy conversion and storage by the use of flexible kind of support for the active material such as conducting textile. Here, we use suspended mixture of graphene oxide (GO) aerogel, carbon nanotubes and poly(vinylidene fluoride-co-hexafluoropropylene) for screen printing of flexible electrodes on carbon cloth. Two kinds of reduced graphene oxide (rGO) aerogels are prepared using freeze drying of GO solution with further reduction at 180 degrees C in vacuum and at 700 degrees C in Ar, respectively. The composite electrodes with rGO annealed at 180 degrees C show higher specific capacitance likely because of better homogeneity and surface wettability and despite lower reduction degree and electrical conductivity compared to that of the electrodes with rGO heat treated at 700 degrees C. The highest specific capacitance values of 129, 116, 110, 104 F g(-1) at 0.1, 0.2, 0.5 and 1 A g(-1), respectively, are obtained for the flexible composite electrode on the carbon cloth with rGO aerogel annealed at 180 degrees C. Moreover, the rGO-aerogel-based electrode shows high rate capability because it can retain 80% of capacitance as the discharge current is raised from 0.1 to 1 A g(-1). This stable capacitive performance of the prepared flexible electrodes demonstrates their high potential for wearable electronics and self-powered devices.

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