Electrochemically Formed Graphene Network for Supercapacitor


Bas H. H., Kaya H., Şener M., Atalay F.

pcfm 2020, Malatya, Türkiye, 22 - 24 Eylül 2020, ss.22

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Malatya
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.22
  • İnönü Üniversitesi Adresli: Evet

Özet

2D graphene-containing structures have been used in electromagnetic shielding, optoelectronics, sensor technology and especially in energy applications, due to their unique thermal, electrical and mechanical properties. However, parameters such as the inhomogeneous distribution of graphene sheets and the tendency to be repacked among them, high interlayer resistance have significantly limited the area of use of graphene.

In this work, the 3D graphene network structure was electrodeposited on Ni foam in a three-electrode cell at a constant potential of -5V versus Ag/AgCl electrode for 60 minutes. An Ag/AgCl electrode and platinum electrode were used as a reference electrode and counter electrode, respectively. The solution containing electrochemically exfoliated graphene layers was used electrolyte. A Garaphene layer on Ni foam was determined by Raman spectroscopy. The obtained graphene/Ni foam (GNF) porous structure was directly used as a supercapacitor electrode.

The electrochemical properties of the GNF electrode were investigated by cyclic voltammetry, long term charge-discharge measurements, and electrochemical impedance spectroscopy. The maximum value of the specific capacitance was calculated to be 801 F/g, 716F/g, 579 F/g and 538 F/g for 1.25A/g, 2.5 A/g, 3.75 A/ g and 6.25 A/g constant current values, respectively. Long time 5000 charge-discharge measurements, the capacitance retention rate was determined as 95℅