Active carbon/graphene hydrogel nanocomposites as a symmetric device for supercapacitors

Ates M., Cinar D., Caliskan S., GEÇGEL Ü., ÜNER O., BAYRAK Y., ...Daha Fazla

Fullerenes Nanotubes and Carbon Nanostructures, cilt.24, sa.7, ss.427-434, 2016 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 7
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1080/1536383x.2016.1174115
  • Dergi Adı: Fullerenes Nanotubes and Carbon Nanostructures
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.427-434
  • Anahtar Kelimeler: thermal exfoliation, Symmetric supercapacitor, Energy density, Graphene hydrogel, Active carbon, Power density
  • Kırklareli Üniversitesi Adresli: Evet

Özet

Activated carbons (ACs) are successfully synthesized from Elaeagnus grain by a simple chemical synthesis methodology and demonstrated as novel, suitable supercapacitor electrode materials for graphene hydrogel (GH)/AC nanocomposites. GH/AC nanocomposites are synthesized via hydrothermal process at temperature of 180°C. The low-temperature thermal exfoliation approach is convenient for mass production of graphene hydrogel (GH) at low cost and it can be used as electrode material for energy storage applications. The GH/AC nanocomposites exhibit better electrochemical performances than the pure GH. Electrochemical performance of the electrodes is studied by cyclic voltammetry, and galvanostatic charge-discharge measurements in 1.0 M H2SO4 solution. A remarkable specific capacitance of 602.36 Fg−1 (based on GH/AC nanocomposites for 0.4 g AC) is obtained at a scan rate of 1 mVs−1 in 1 M H2SO4 solution and 155.78 Fg−1 for GH. The specific capacitance was increased 3.87 times for GH/AC compared to GH electrodes. Moreover, the GH/AC nanocomposites for 0.2 g AC present excellent long cycle life with 99.8% specific capacitance retained after 1000 charge/discharge processes. Herein, ACs prepared from Elaeagnus grain are synthesized GH and AC supercapacitor device for high-performance electrical energy storage devices as a promising substitute to conventional electrode materials for EDLCs.