4.8 Article

Towards high-efficient microsupercapacitors based on reduced graphene oxide with optimized reduction degree

Journal

ENERGY STORAGE MATERIALS
Volume 25, Issue -, Pages 740-749

Publisher

ELSEVIER
DOI: 10.1016/j.ensm.2019.09.012

Keywords

Supercapacitor; Reduced graphene oxide; Aerogel; Reduction degree; Porous structure

Funding

  1. Spanish Ministry MINECO (AEI/FEDER,UE) [ENE2016-79282-C5-1-R]
  2. Gobierno de Aragon (EU Regional Development Funds FEDER,UE) [Grupo Reconocido DGA T03_17R]

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Reduced graphene oxide aerogels synthetized using different times of hydrothermal treatment have been tested as raw material to prepare electrochemical supercapacitors. The gravimetric electrochemical capacitance measured using 1 M Na2SO4 as electrolyte was maximized for aerogels that underwent 45 min of hydrothermal treatment. The aerogels synthetized for longer durations of hydrothermal treatment exhibited higher electrical conductivity but the gravimetric capacitance drops dramatically due to an increasing resistance to diffusion of the electrolyte ions. The impeded diffusion is boosted by the intensified crosslinking between graphene sheets, which narrows the pores between them in the prepared electrode. The rGO aerogel attained for 45 min of hydrothermal treatment provided a high gravimetric capacitance of 400 F/g and 100 F/g at 50 A g(-1) for three-electrode and two electrodes configuration, respectively, as well as good cyclic stability, competing with other similar carbon materials. Activation pretreatments or adding a second component (glucose, Mn, Fe, CNT) did not provide significant change of capacitance respect to pristine rGO aerogel.

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