Impedance Measurement and Selection of Electrochemical Equivalent Circuit of a Working PEM Fuel Cell Cathode

Darowicki, Kazimierz; Gawel, L.

doi:10.1007/s12678-017-0363-0

Cited by 35 publications

(9 citation statements)

References 31 publications

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“…The Nyquist plots of both the peptide nanotubes and Nafion films (Figure 2b,c) have a shape that is characteristic of proton conducting polymer electrolytes and can be described by a Randles equivalent circuit. 25,31 In this plot the semicircle is usually correlated to the response of the bulk of the membrane, and the inclining line represents diffusion processes at the vicinity of the interface with the contacts. 32−34 Overlap between the frequency ranges of the two processes results in an incomplete semicircle, as observed for both samples.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Peptide Nanotube Films with High Proton Conductivity

et al. 2019

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Design flexibility and modularity have emerged as powerful tools in the development of functional self-assembled peptide nanostructures. In particular, the tendency of peptides to form fibrils and nanotubes has motivated the investigation of electron and, more recently, proton transport in their fibrous films. In this study, we present a detailed characterization by impedance spectroscopy of films of self-assembled cyclic octa-d,l-α-peptide self-assembled nanotubes with amine side chains that promote proton transport. We show that the conductivity of the peptide nanotube film, which is in the range of 0.3 mS cm–1, is within the same order of magnitude as that of ultrathin films of Nafion, a benchmark proton conducting polymer. In addition, we show that while slow diffusion processes at the interface are present for both films, additional interface effects occur in the peptide nanotube films at the same rate as their bulk proton transport effects, further limiting charge transport at the interface. Overall, our studies demonstrate the great potential of using peptides as building blocks for the preparation of bioinspired supramolecular proton conducting polymers with improved conductivity with respect to that of natural systems.

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Section: Resultsmentioning

confidence: 99%

Self-Assembled Peptide Nanotube Films with High Proton Conductivity

et al. 2019

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“…Meanwhile, its slight increase of C d represented a growth of the compact passive film with a long-term stability. As for the Fe/CaCl 2 composite, a relatively low R ct and C d indicated its high charge transfer ability and porous product layer with poor protection efficiency ( Marinenko and Foley, 1975 ; Darowicki and Gawel, 2017 ).…”

Section: Resultsmentioning

confidence: 99%

Laser Additively Manufactured Iron-Based Biocomposite: Microstructure, Degradation, and In Vitro Cell Behavior

Yang

Cai

Yang

et al. 2021

Front. Bioeng. Biotechnol.

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A too slow degradation of iron (Fe) limits its orthopedic application. In this study, calcium chloride (CaCl2) was incorporated into a Fe-based biocomposite fabricated by laser additive manufacturing, with an aim to accelerate the degradation. It was found that CaCl2 with strong water absorptivity improved the hydrophilicity of the Fe matrix and thereby promoted the invasion of corrosive solution. On the other hand, CaCl2 could rapidly dissolve once contacting the solution and release massive chloride ion. Interestingly, the local high concentration of chloride ion effectively destroyed the corrosion product layer due to its strong erosion ability. As a result, the corrosion product layer covered on the Fe/CaCl2 matrix exhibited an extremely porous structure, thus exhibiting a significantly reduced corrosion resistance. Besides, in vivo cell testing proved that the Fe/CaCl2 biocomposite also showed favorable cytocompatibility.

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“…The impedance response was modelled by using equivalent circuit presented in Figure . This model assumed conventional fuel cell interfaces where membrane is the source of electrolyte resistance with anode and cathode electrodes contributing mass transfer and charge transfer resistances in series . Electrolyte resistance and charge transfer resistances were given in Table .…”

Section: Resultsmentioning

confidence: 99%

Assessment of Glucose Oxidase Based Enzymatic Fuel Cells Integrated With Newly Developed Chitosan Membranes by Electrochemical Impedance Spectroscopy

Bahar¹,

Yazici²

2020

Electroanalysis

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Considerably stable enzymatic fuel‐cells (single cell and 5‐cells stack) were prepared by using chitosan based membranes along with glucose oxidase attached bioanode. Continuous operation of fuel‐cells were monitored under short circuit conditions reaching half‐life over a week. Detailed analysis for the effects of pH, temperature, buffer types and concentration on different type of in‐house produced chitosan membranes were performed by electrochemical impedance spectroscopy (EIS). EIS was utilized to observe, total electrolyte resistance, charge transfer properties, mass transfer and double layer effects on integrated fuel cells (single cell and 5‐cells stack). Performance of the fuel cells was also analyzed by the polarization experiments. Current density of the fuel cell increased at higher operation temperatures not only due to better enzyme kinetics, but also due to increase in electrolyte (membrane+buffer solution) conductivity. Buffer concentration in the fuel (glucose) solution was found as an important parameter. Under optimum fuel cell operation conditions (i. e. 30–40 °C, pH 5 0.3 M buffer solution), maximum current densities of 3.0–3.2 mA cm−2 were reached. Low‐power devices (i. e. a calculator, step motor) were powered with 5‐cell stack producing 3 mW at 1.3 V.

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Impedance Measurement and Selection of Electrochemical Equivalent Circuit of a Working PEM Fuel Cell Cathode

Cited by 35 publications

References 31 publications

Self-Assembled Peptide Nanotube Films with High Proton Conductivity

Self-Assembled Peptide Nanotube Films with High Proton Conductivity

Laser Additively Manufactured Iron-Based Biocomposite: Microstructure, Degradation, and In Vitro Cell Behavior

Assessment of Glucose Oxidase Based Enzymatic Fuel Cells Integrated With Newly Developed Chitosan Membranes by Electrochemical Impedance Spectroscopy

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