Hydrogen evolution on Pt and polyaniline modified Pt electrodes—a comparative electrochemical impedance spectroscopy study

Košiček, Katja Magdić; Kvastek, Krešimir; Horvat-Radošević, Višnja

doi:10.1007/s10008-016-3246-z

Cited by 18 publications

(11 citation statements)

References 47 publications

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“…Impedance values and types of impedance/frequency responses at different polarization potentials are in general agreement to those already obtained for PANI films at various oxidation states. [9,[35][36][37][38][39][40][41][42][43][44][45] Impedance due to experimental artefacts [35,37] and pure resistive impedance response which is mainly due to the uncompensated solution resistance, appeared at the highest frequencies, and are followed by PANI film impedance response at lower frequencies [32][33][34] . As expected, the impedance magnitude of PANI film is the highest for the reduced, PANI-LE state at -0.20 V and the lowest for the half-oxidized, PANI-EM state at 0.45 V vs. SCE.…”

Section: Experimental Impedance Spectramentioning

confidence: 99%

“…-90°) response (Figure 4a), or combined with a Warburglike phase angle (ca. -45°) response generated by slow charge transport within the PANI film [38,44] (Figure 4b). It is important to notice here that IS measured at these two limited potential values do not change considerably with time spent for two consecutive measurements, except for the just reduced PANI.…”

Section: Experimental Impedance Spectramentioning

confidence: 99%

“…Just the Nyquist type of PANI film impedance representation has been most frequently analysed in the literature. [35][36][37][38][39][40][41][42][43][44][45] Semicircle responses have usually been ascribed to double-layer interfacial capacitance coupled with charge transfer kinetics, while more or less vertical lines are due to more or less overlapped Warburg and pseudo-capacitive impedance responses. Time changes of IS are in Figure 5 denoted by arrows, suggesting either continuous decrease of circle diameters for LE-EM transition (Figure 5a), or continuous increase of circle diameters for EM-LE transition (Figure 5b).…”

Section: Experimental Impedance Spectramentioning

confidence: 99%

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Frequency Response Analysis of a Nonstationary System: Electrochemical Transition of Polyaniline

Košiček¹,

Horvat-Radošević²,

Kvastek³

2018

Croat. Chem. Acta

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In this work, impedance spectra of polyaniline film electrode recorded at some redox transition potentials have been corrected for nonstationarity by application of Stoynov's 4-D method. The procedure consisted from: a) conventional measurements of a series of impedance spectra under strictly same experimental conditions, which are accompanied by monitoring of real operating time intervals for measurement of each particular impedance spectrum of the series, b) determination of functional dependence(s) between iso-frequency impedance values and operating time, and c) calculations of instantaneous IS for the time instant of the beginning of the first IS measurement. Comparison between measured and instantaneous impedance spectra, and also between their individual impedance parameter values pointed toward significant differences in charge transfer and transport resistance values. The results suggest that erroneous (either underestimated or overestimated) charge transfer and transport resistance values will be obtained if measured impedance spectra were not corrected for nonstationarity.

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Section: Experimental Impedance Spectramentioning

confidence: 99%

Section: Experimental Impedance Spectramentioning

confidence: 99%

Section: Experimental Impedance Spectramentioning

confidence: 99%

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Frequency Response Analysis of a Nonstationary System: Electrochemical Transition of Polyaniline

Košiček¹,

Horvat-Radošević²,

Kvastek³

2018

Croat. Chem. Acta

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“…Oxidation structures for Ani and pAP depend on the potential and pH of the electrolyte, and these two factors signifi cantly affect the conductivity of the copolymer surface and the electrolyte 37, 38 . Therefore, the impedance spectra of the Ani-co-pAP are expected to be infl uenced by DC potential.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Determination of ascorbic acid using differential pulse voltammetry method on aniline-co-para–aminophenol modified electrode

Parsa

Tajik

2017

Polish Journal of Chemical Technology

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The electro-synthesis of poly(aniline-co-para-aminophenol) on graphite electrode was examined using cyclic voltammetry (CV) over the potential window of −0.2 V to 1 V in phosphoric acid medium, which was comprised of potassium chloride and para-Toluene sulfonic acid (pTSA) as electrolyte support. Fourier transform infrared (FTIR) spectroscopy was employed to identify the electro-synthesized copolymer while impedance techniques were used to determine charge transfer resistance (Rct) in modifi ed and unmodifi ed electrodes. After this, the electro-catalytic effect of the modifi ed electrode on ascorbic acid was examined using differential pulse voltammetry (DPV) and a very strong response was observed. A negative shift of about 0.33 V was found in the peak anodic potentials for ascorbic acid. Measurement using DPV indicated a proper response by the electrode to a wide range of ascorbic acid concentrations, from 0.0001 to 0.0004 M. The peak anodic currents for increased concentrations showed a proper linear range.

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“…Here, the choice of polymers can matrix with the inorganic active sites to prevent them from aggregation and the water splitting carried out over the electrode surface results in good conductivity to charge transfer from the electrode to the active sites. Moreover, the advantages of such polymers increase the conductivity and the dispersity of active sites over the electrode surface [29,50,51] . The important concepts with polymers such as effective with conductivity which end up with less resistance towards charge transfer kinetics.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Conductive Polymer‐Based Electro‐/Photoelectrocatalytic Materials for Effective Hydrogen/Oxygen Evolution Reactions: A Review

et al. 2022

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Currently, a substantially greener energy source such as hydrogen fuel cell is an alternative to fossil fuel sources, and much research has been dedicated to achieving highly efficient hydrogen (H2 gas) generation. In this line, electrochemical water splitting that involves hydrogen and oxygen evolution reactions (HER and OER, respectively) is considered to be the greener and most effective hydrogen‐generating procedure with only water as a by‐product. However, in the process of successful OER/HER, it is extremely demanding for electrocatalysts with high activity, stability and cost‐effectiveness for the water splitting process. Herein, the review proposed promising electrocatalysts such as conductive polymers (CPs) with enhanced catalytic effect with the polymer encapsulation of catalytic material that provides an increase in charge transfer kinetics both in OER/HER. Also, the review highlights the OER and HER mechanism of conducting polymers and their effect on the synergism was discussed in detail. Also, the review detailed the reduced overpotentials, importance and enhancement of catalytic efficiency with various polymers reported in both OER and HER. Here, the choice of polymers can matrix with the inorganic active sites to prevent them from aggregation and the water splitting carried out over the electrode surface results in good conductivity to charge transfer from the electrode to the active sites. In addition, the review discussed the polymers induces the photon effect with photoelectrocatalytic water splitting. Thus, the combing effect with conducting polymers and the materials with catalytic active centers open up a new kind of electrocatalyst for synthesis.

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Hydrogen evolution on Pt and polyaniline modified Pt electrodes—a comparative electrochemical impedance spectroscopy study

Cited by 18 publications

References 47 publications

Frequency Response Analysis of a Nonstationary System: Electrochemical Transition of Polyaniline

Frequency Response Analysis of a Nonstationary System: Electrochemical Transition of Polyaniline

Determination of ascorbic acid using differential pulse voltammetry method on aniline-co-para–aminophenol modified electrode

Recent Developments in Conductive Polymer‐Based Electro‐/Photoelectrocatalytic Materials for Effective Hydrogen/Oxygen Evolution Reactions: A Review

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