Capacitive behavior of polycarbazole- and poly(N-vinylcarbazole)-coated carbon fiber microelectrodes in various solutions
Yükleniyor...
Dosyalar
Tarih
2009
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The electrochemical behavior of polycarbazole (PCz) and poly(N-vinyl carbazole) P(NVCz) was investigated by means of electrochemical impedance spectroscopy (EIS). Supporting electrolytes made from various combinations of solvents (acetonitrile and propylene carbonate) and salts (sodium perchlorate, lithium perchlorate, and tetraethyl ammonium perchlorate) were employed in the investigation. Information on the double layer capacitance (C-dl) and specific capacitance (C-sp) of P(NVCz) was achieved by cyclic voltammetry (CV), chronoamperometry and chronopotentiometry. Carbon fiber microelectrodes (CFME) were electrocoated by cyclic voltammetry in a monomer-free solution and displayed film thicknesses in the range similar to 200 nm to similar to 4.8 mu m. The capacitive behavior of the PCz- and P(NVCz)-coated carbon fiber microelectrodes was also investigated by CV. The effects of the type of electrolyte and solvent on the electrochemical impedance spectroscopic data were subsequently fitted with an ((R(C(R(Q(RW))))(CR))-equivalent circuit model to calculate the numerical values of the proposed components. The obtained experimental C-sp values for PCz/CFME and P(NVCz)/CFME, as measured in LiClO4/ACN, were 280.5 mF g(-1) and 294.1 mF g(-1), respectively.
Açıklama
Anahtar Kelimeler
Electrochemical impedance spectroscopy, Carbon fiber microelectrode, Electrocoating, Electrochemical properties, Equivalent circuit, Electrochemical Impedance Spectroscopy, Conducting-Polymer Electrodes, Thin-Films, Polyaniline, Copolymer, Acid, Supercapacitor, Morphology, Carbazole, Dopamine
Kaynak
Journal of Applied Electrochemistry
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
39
Sayı
10
