Uso da voltametria cíclica e da espectroscopia de impedância eletroquímica na determinação da área superficial ativa de eletrodos modificados à base de carbono

Souza, Leticia Lopes de

doi:10.11606/d.85.2011.tde-21112011-095420

Cited by 1 publication

(3 citation statements)

References 41 publications

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“…-Electrode process scan be related to electric circuit components through Electrochemical Impedance Spectroscopy. 12,41 Figure 11 shows Nyquist plot of PANI@CFF composite to three, six and nine voltammetric cycles and carbon fiber felt annealed at 1600 K.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…According to Nyquist (Figure 11) and Bode Modulus plots (Figure 12), it is noticeable that CFF shows impedance higher than PANI@CFF composite, 12 especially at low frequency between 0.1 and 100 Hz.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…11 PANI and CFF united show singular properties due to synergism existing between these materials, because the electroactive character of polymers added to high superficial area and mechanic support of CFF. 12 So, PANI@CFF composite is promisor to attend cited requirements.…”

mentioning

confidence: 99%

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Electrosynthesis of Polyaniline on Carbon Fiber Felt: Influence of Voltammetric Cycles on Electroactivity

Poli

Caetano

Vargas

et al. 2017

J. Electrochem. Soc.

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The carbon materials and conducting polymers are known by application in electronic devices. This work aims to study the initial steps parameters of polyaniline electrosynthesis on carbon felts annealed at 1600 K by changing the number of voltammetry cycles in aniline acid solution. The characterization was performed by Field Emission Gun – Scanning Electron Microscopy, X-ray Diffraction, Infrared Fourier Transform Spectroscopy, Raman Spectroscopy and Electrochemical Impedance Spectroscopy. Under increasing number of cycles, the growth was more intense and it was easy to observe the pores clogging. Besides, it was noticed that emeraldine formation occurred progressively, from structures less to more oxidized: the polyaniline less cycled resulted closest that leucoemeraldine; polyaniline from nine cycles resulted closest to emeraldine, but all of them showed electroactive defects related to electrical charge (polarons) and conductivity (bipolarons). It was also observed that prime layers of polyaniline, formed until three cycles, followed more intense attraction of charges in solution to layer surface. This effect was emphasized from 3rd to 6th cycles.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%