Peer Reviewed: Electrochemical Impedance Spectroscopy for Better Electrochemical Measurements

Park, Su‐Moon; Yoo, Jung-Suk

doi:10.1021/ac0313973

Cited by 379 publications

(161 citation statements)

References 29 publications

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“…As expected, a linear-like graph, revealing a pure diffusion-limited behavior, is obtained. 26,34 This indicates that the charge transfer resistance is low, and that the reaction is thermodynamically favored, i.e. that there are no secondary phenomena (formation of chemical bonds, adsorption, etc.)…”

Section: Figurementioning

confidence: 99%

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Trouillon

Gijs

2014

Lab Chip

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ARTICLEThis journal is © The Royal Society of Chemistry 2013 J. Name., 2013, 00, 1-3 | 1 The time response of an electrode incorporated into a fluidic channel to variations in analyte concentration of the outer-sphere redox probe ferrocenemethanol was investigated, both for amperometry (AMP) and cyclic voltammetry (CV). The experimental data show that the temporal resolution of CV is not as good as for AMP, as CV cannot properly detect fast concentration transients. The delayed response of CV was previously reported, for neurotransmitters, and mostly attributed to adsorption of the analyte to the electrode surface. By using an outer-sphere redox couple, we show that mass transport also significantly delays the response of CV. The experimental delay time in CV was understood from mass transfer limitations due to the relaxation of the diffusion layer during repeated potential scanning. Furthermore, a robust protocol for the analysis of fast concentration transients was established, using the impulse and modulation transfer functions of the system. This method was found to be more precise than the mere analysis of the undifferentiated traces in the time domain. As a proof of concept, the effect of increased viscosity was investigated, showing that AMP was more sensitive than CV to these variations. Overall, this analysis underlines further the enhanced temporal sensitivity of AMP over CV, at the expense of decreased chemical resolution, potentially having implications for in situ electrochemical detection of biologically relevant molecules.

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Section: Figurementioning

confidence: 99%

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Trouillon

Gijs

2014

Lab Chip

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“…Electrochemical impedance spectroscopy (EIS) is a useful tool to investigate these losses and delineate the individual contributions from different resistances to the overall cell impedance (Bard and Faulkner, 2000;Barsoukov and MacDonald, 2005;Orazem and Tribollet, 2006;Park and Yoo, 2003;Scully et al, 1993). Such resistances include ohmic resistances of the cation exchange membrane (if present), electrolyte, and metallic connections, charge transfer and mass transfer polarization resistances on the anode and cathode.…”

Section: Introductionmentioning

confidence: 99%

Impact of initial biofilm growth on the anode impedance of microbial fuel cells

Ramasamy

Ren

Mench

et al. 2008

Biotech & Bioengineering

217

125

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Electrochemical impedance spectroscopy (EIS) was used to study the behavior of a microbial fuel cell (MFC) during initial biofilm growth in an acetate-fed, two-chamber MFC system with ferricyanide in the cathode. EIS experiments were performed both on the full cell (between cathode and anode) as well as on individual electrodes. The Nyquist plots of the EIS data were fitted with an equivalent electrical circuit to estimate the contributions of various intrinsic resistances to the overall internal MFC impedance. During initial development of the anode biofilm, the anode polarization resistance was found to decrease by over 70% at open circuit and by over 45% at 27 mA/cm 2 , and a simultaneous increase in power density by about 120% was observed. The exchange current density for the bio-electrochemical reaction on the anode was estimated to be in the range of 40-60 nA/cm 2 for an immature biofilm after 5 days of closed circuit operation, which increased to around 182 nA/cm 2 after more than 3 weeks of operation and stable performance in an identical parallel system. The polarization resistance of the anode was 30-40 times higher than that of the ferricyanide cathode for the conditions tested, even with an established biofilm. For a two-chamber MFC system with a Nafion 1 117 membrane and an inter-electrode spacing of 15 cm, the membrane and electrolyte solution dominate the ohmic resistance and contribute to over 95% of the MFC internal impedance. Detailed EIS analyses provide new insights into the dominant kinetic resistance of the anode bio-electrochemical reaction and its influence on the overall power output of the MFC system, even in the high internal resistance system used in this study. These results suggest that new strategies to address this kinetic constraint of the anode bio-electrochemical reactions are needed to complement the reduction of ohmic resistance in modern designs.

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“…Impedance (Z) depends on the charge transfer resistance (R ct ), the solution resistance (R s ), the capacitance of the electrical double layer, and the frequency of the AC signal (ω). The high-frequency intercept was equal to the solution resistance and the low-frequency intercept was equal to the sum of the solution and charge transfer resistances [51]. Figure 10 shows the Nyquist plots for (a) bare CRS electrode, (b) CRS electrode coated with smooth epoxy thermoset, (c) CRS electrode coated with biomimetic epoxy thermoset, (d) CRS electrode coated with biomimetic epoxy-silica containing 1% composite and (e) CRS electrode coated with biomimetic epoxy-silica containing 3% composite.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Composite coating with synergistic effect of biomimetic epoxy thermoset morphology and incorporated superhydrophobic silica for corrosion protection

Ji¹,

Li²,

Wen-ying³

et al. 2016

Express Polym. Lett.

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Peer Reviewed: Electrochemical Impedance Spectroscopy for Better Electrochemical Measurements

Cited by 379 publications

References 29 publications

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Delayed voltammetric with respect to amperometric electrochemical detection of concentration changes in microchannels

Impact of initial biofilm growth on the anode impedance of microbial fuel cells

Composite coating with synergistic effect of biomimetic epoxy thermoset morphology and incorporated superhydrophobic silica for corrosion protection

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