An Electrochemical Study on Anion Doping-Undoping Process of Polyacetylene by Means of FFT Impedance Measurement

Abstract

An electrochemical anion doping-undoping process of cis-polyacetylene, (CH)x, was investigated in 1 mol dm−3 LiClO4 or LiBF4 in propylene carbonate by the FFT impedance measurement. This could be applied to the system with time-variation because of its high speed measuring duration. The doping-undoping process of the anion was represented by the Randles-type equivalent circuit, considering the corrective term concerned with surface roughness. The impedance behavior of the doping-undoping process was pursued by the variation of resistive component, Rr. The value of Rr was mainly reflected by the dopant concentration at the surface. The variation of Rr indicated that rapid or strong-drive doping produces non-uniformity of dopant distribution in the film and high dopant concentration at the surface.

Application of Electrochemical Impedance Spectroscopy to Ferri/Ferrocyanide Redox Couple and Lithium Ion Battery Systems Using a Square Wave as Signal Input

“…For an input current signal at high frequencies of 5.0 Hz and 50 Hz, EIS was carried out using a square current input with a Fourier transform, as detailed in [15] and [16]. The peak-to-peak amplitude and base current (offset current) were 800 mA and 600 mA, respectively.…”

“…It was reported that white noise [11,12], pseudo-random noise (pseudo-white noise) [12][13][14][15][16][17], pseudo-random signals [18], multi-sine waves (superimposed sine waves) [19,20], step signals [10,12,[21][22][23][24][25], and square pulses [26,27] can be applied to FFT impedance. An on-line FFT impedance measurement system using pseudo-white noise as the input signal was developed by one of our authors [14,15], and its application to in situ EIS was reported [15][16][17]. AC voltammetry has been widely used for electrochemical analysis [35,36].…”

Spectroscopic Study of Interactions of Metal Complexes, Metal Salts and Amino Acids with Anionic Surfactant Sodium Dodecyl Sulphate (SDS) Using Surfactant-Solute-PAN Dye Ternary Systems

“…The hydrophobic interaction occurs between the hydrophobic tail of SDS and bulky ligand of metal complexes has predominance over the electrostatic interaction and the hydrophobic interaction is related to the type of ligand involved. Tachiyashiki et al [19] have commented that the interaction of the Fe(II) complexes with CTAB is predominantly hydrophobic and also mentioned a strong interaction of quaternary ammonium head group with π-electron system of aromatic groups of the ligands in the iron(II) complex is also quite significant. Oldega et al [20] They reported that hydrophobic interaction is more significant and lowers CMC more than electrostatic interaction.…”

New Analysis of Electrochemical Impedance Spectroscopy for Lithium-ion Batteries

“…[1][2][3][4][5][6][7][8][9][10][11][12]17,[25][26][27][28] The conventional EIS measured by a frequency response analyzer (FRA) and potentiostat system is a powerful tool to check the state of LIBs (i.e. SOC and SOH).…”

“…The first stage of our work on the EIS focused on electrochemical reactions of electroconducting polymers. [7][8][9][10] At the same time, Professor Su-Moon Park also investigated electroconducting 158 Tetsuya Osaka, Hiroki Nara, Daikichi Mukoyama, and Tokihiko Yokoshima polymers by means of the EIS. 11,12 In addition, Professor Su-Moon Park [13][14][15] and our team 9,16,17 worked in the same field of electroconducting polymers prior to working on the EIS.…”