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Bard, Allen J.; Inzelt, György; Scholz, Fritz

doi:10.1007/978-3-642-29551-5_7

Cited by 59 publications

(94 citation statements)

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“…Since the Debye lengthλ D is large in the depletion region the negative zeta potential is also large, −ζ ≫ 1. The majority of the screening charge is therefore located within the smaller Gouy lengthλ G ≪λ D [37,38]. In Fig.…”

Section: Boundary Layer Modelsmentioning

confidence: 93%

Concentration polarization, surface currents, and bulk advection in a microchannel

Nielsen

Bruus

2014

Phys. Rev. E

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We present a comprehensive analysis of salt transport and overlimiting currents in a microchannel during concentration polarization. We have carried out full numerical simulations of the coupled Poisson-Nernst-Planck-Stokes problem governing the transport and rationalized the behaviour of the system. A remarkable outcome of the investigations is the discovery of strong couplings between bulk advection and the surface current; without a surface current, bulk advection is strongly suppressed. The numerical simulations are supplemented by analytical models valid in the long channel limit as well as in the limit of negligible surface charge. By including the effects of diffusion and advection in the diffuse part of the electric double layers, we extend a recently published analytical model of overlimiting current due to surface conduction.

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Section: Boundary Layer Modelsmentioning

confidence: 93%

Concentration polarization, surface currents, and bulk advection in a microchannel

Nielsen

Bruus

2014

Phys. Rev. E

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“…The discord already starts with how to correctly account for the ohmic (iR) correction of the potential. Where many examples of using the purely ohmic resistance of the HFR (or equivalently the current step response) can be found [47,28,48,49], it is also conceivable to compensate for the total cell resistance represented by the LFR (or IV slope), since it may contain ohmic contributions from components of the cell other than the membrane and contacts. An example could be the ionic conduction within the Nafion catalyst binder [50,37].…”

Section: Tafel Plot Analysismentioning

confidence: 99%

Model-supported characterization of a PEM water electrolysis cell for the effect of compression

Frensch

Olesen

Araya

et al. 2018

Electrochimica Acta

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This paper investigates the influence of the cell compression of a PEM water electrolysis cell. A small single cell is therefore electrochemically analyzed by means of polarization behavior and impedance spectroscopy throughout a range of currents (0.01 A cm −2 to 2.0 A cm −2 ) at two temperatures (60• C and 80• C) and eight compressions (0.77 MPa to 3.45 MPa). Additionally, a computational model is utilized to support the analysis. The main findings are that cell compression has a positive effect on overall cell performance due to decreased contact resistances, but is subject to optimization. In this case, no signs of severe mass transport problems due to crushed transport layers are visible in either polarization curves or impedance plots, even at high currents. However, a Tafel plot analysis revealed more than one slope throughout the current range. The change in the Tafel slope is therefore discussed and connected to the electrochemical reaction or an ohmic contribution from a non-electrode component.

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“…The reason is that the capacitive background current is decreased when using lower scan rates, see also Box 1 and e.g. 17,21 for details. However, the nonturnover CV only shows all redox-active compounds at the electrode and thus the E f of the possible EET sites.…”

Section: Nonturnover Conditions -Identifying Possible Eet Sitesmentioning

confidence: 99%

“…Most popular, however, is cyclic voltammetry (CV) 19,20 . CV is well-known and widespread in different fields of electrochemistry ranging from battery research via materials science to enzyme bioelectrochemistry 21 . Its application to living microbial cells can only be dated back more than one decade 22 and increases significantly during the last years 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Gimkiewicz

2013

JoVE

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The growth of anodic electroactive microbial biofilms from waste water inocula in a fed-batch reactor is demonstrated using a three-electrode setup controlled by a potentiostat. Thereby the use of potentiostats allows an exact adjustment of the electrode potential and ensures reproducible microbial culturing conditions. During growth the current production is monitored using chronoamperometry (CA). Based on these data the maximum current density (j max ) and the coulombic efficiency (CE) are discussed as measures for characterization of the bioelectrocatalytic performance. Cyclic voltammetry (CV), a nondestructive, i.e. noninvasive, method, is used to study the extracellular electron transfer (EET) of electroactive bacteria. CV measurements are performed on anodic biofilm electrodes in the presence of the microbial substrate, i.e. turnover conditions, and in the absence of the substrate, i.e. nonturnover conditions, using different scan rates. Subsequently, data analysis is exemplified and fundamental thermodynamic parameters of the microbial EET are derived and explained: peak potential (E p ), peak current density (j p ), formal potential (E f ) and peak separation (ΔE p ). Additionally the limits of the method and the state-of the art data analysis are addressed. Thereby this video-article shall provide a guide for the basic experimental steps and the fundamental data analysis.

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Cited by 59 publications

References 0 publications

Concentration polarization, surface currents, and bulk advection in a microchannel

Concentration polarization, surface currents, and bulk advection in a microchannel

Model-supported characterization of a PEM water electrolysis cell for the effect of compression

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

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