Three-dimensional design and fabrication of reduced graphene oxide/polyaniline composite hydrogel electrodes for high performance electrochemical supercapacitors
Yükleniyor...
Dosyalar
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Iop Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Graphene/polyaniline composite hydrogels (GH/PANI) were chemically synthesized by in situ polymerization of aniline monomer. Graphene hydrogels were obtained by a hydrothermal method and used in supercapacitors. The graphene/polyaniline composite hydrogel exhibits better electrochemical performance than the pure individual components as determined by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopic measurements. A remarkable specific capacitance (C-sp) of 323.9 F g(-1) was measured using CV at a scan rate of 2 mV s(-1) at 25 degrees C. GCD measurements (311.3 F g(-1)) and electrochemical impedance analysis also support these results. The numbers were obtained at extremely high loading masses: 7.14 mg cm(-2) for GH and GH/PANI synthesized at 0 degrees C, and 8.93 mg cm(-2) for GH/PANI synthesized at 25 degrees C. The corresponding areal capacitances are 1.14, 1.75 and 2.78 F cm(-2) for GH, and GH/PANI composite hydrogels synthesized at 0 degrees C and 25 degrees C, respectively. These values in F cm(-2) are 3.80, 5.83 and 9.27 times higher than commercially available activated carbon supercapacitors (similar to 0.3 F cm(-2) for a two electrode system). Moreover, the GH/PANI composite synthesized at 25 degrees C exhibits excellent stability with 99% initial capacitance retention after 1000 charge/discharge cycles. GH/PANI composites synthesized at 0 degrees C and 25 degrees C therefore hold promise for use in supercapacitor device applications.
Açıklama
Anahtar Kelimeler
supercapacitor, energy density, thermal exfoliation, graphene hydrogel, polyaniline, Conducting Polymers, Carbon Nanotube, Polyaniline, Oxide, Films, Polymerization, Nanocomposite, Construction, Behavior
Kaynak
Nanotechnology
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
29
Sayı
17
