Coupled transport phenomena in overlimiting current electrodialysis

Zabolotsky, V. I.; Nikonenko, Victor; Pismenskaya, Natalia; Laktionov, E.V.; Уртенов, М. Х.; Strathmann, H.; Weßling, Matthias; Koops, G.H.

doi:10.1016/s1383-5866(98)00080-x

Cited by 131 publications

(109 citation statements)

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“…As a result, the maximum in U m is not registered in the chronopotentiograms for current densities higher than 1.5·i lim , and the values of (U m,max -U m,f ) become lower and scattered. The chronopotentiometric results explained above are in agreement with previous studies conducted to characterize the nature of the overlimiting current transfer in systems of cation-exchange membranes [65,69,78,101]. In general, at low electrolyte concentrations the participation of electroconvection on the overlimiting conductance of the membranes is predominating, whereas the role of gravitational convection becomes more important at higher electrolyte concentrations.…”

Section: Fig 480supporting

confidence: 90%

“…This has implied the formulation of additional interpretations in order to explain the origin of the overlimiting currents in electrodialysis, such as the implication of convective phenomena. In this regard, the non-uniform distribution of the electrolyte concentration in the vicinities of the membranes when the i lim is reached can induce the phenomenon of gravitational convection [69]. In addition, the application of strong electric fields can also derive in a current induced destabilization of the diffusion boundary layer, which is known as electroconvection [70].…”

Section: Investigation Of the Mechanisms Of Overlimiting Mass Transfementioning

confidence: 99%

“…When this occurs, the exalted current density of counterions is given by an equation different from ) [78]. Moreover, it has to be taken into account that this effect is restricted to those cases where intense water splitting exists [69].…”

Section: Exaltation Effectmentioning

confidence: 99%

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Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

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Acknowledgements / Agradecimientos / AgraïmentsEn primer lugar quisiera agradecer a Valentín y a Montse por haberme dado la oportunidad de investigar con ellos, por introducirme en un mundo que me ha fascinado, por haberme dirigido, por haberme ayudado en momentos de desasosiego; porque, en definitiva, creo que hemos formado un gran equipo.Quisiera agradecer a la Universitat Politècnica de València la financiación recibida para realizar la tesis. En general, he de agradecer al sistema de educación pública que ha permitido que un hijo de trabajadores como yo haya podido llegar hasta aquí. Además, quiero aprovechar para exigir un sistema de educación público, de calidad, e igualitario, que forme a personas con espíritu crítico y libre; puesto que sólo así se conseguirá que progresemos como sociedad.I would also like to thank to all the people from the group of Chemical Process Engineering of the RWTH Aachen University, especially to Matthias Wessling and Said Abdu, for accepting me in their research group. They have been very kind to me and I have learnt a lot from them and from this fruitful and unforgettable experience in Aachen.También quisiera agradecer a Daniella Buzzi por haberme dejado ser su "chefinho", por tantos momentos buenos y algún que otro momento crítico vividos juntos, porque es bonito saber que tengo una gran amiga al otro lado del charco.Gracias al Grupo IEC, en especial a mis compañeros, con los que he pasado más momentos juntos. Ellos han sido mi familia investigadora. Gracias a Isaac y Carlos, porque han sido para mí un referente, a Jordi y Ramón, porque han estado desde el principio, han sido como mis hermanos, y a Vir y Tepe, ellas han contribuido a que haya un ambiente de trabajo inmejorable! Quiero también dar las gracias al resto de componentes del grupo por su ayuda, en especial a Emma Ortega, a José Luis Guiñón por su ayuda con los equilibrios, y a Anna Igual porque con su energía consigue contagiar su pasión por la investigación.El fruto del trabajo de todos estos años tampoco sería posible sin los momentos vividos junto a mis amigos, el "Kanchy". Ellos son "los de toda la vida", los que siempre han estado, están y estarán ahí. Quisiera hacer mención especial a Lidia por su ayuda con la Tesis, y cómo no, a Sergio, porque juntos hemos arreglado el mundo un millón de veces… ¡para volverlo a destrozar otras tantas! No quiero olvidarme de ninguna de las personas con las que he coincidido y he pasado buenos momentos tanto en Valencia, como en Berlín o en Aachen… Maite, Laura, Guillaume… es imposible nombrarlos a todos… pero quiero agradecer en especial a Tania, porque con ella no existe el tiempo ni la distancia, sé que siempre está ahí a mi lado.Ha arribat el moment d'agrair a les quimixiques els grans moments viscuts. Amb elles hem format una gran família. Em sent molt afortunat d'haver caigut en un grup tan de "puça mare": gràcies a les Silvies, Elena, Gabriel·la, Angeleta, Rosa de Xeraco, Alicia, i en especial a Susana, la meua companya de batalles, i a Ingrid, una gran amiga.Per últim...

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Section: Fig 480supporting

confidence: 90%

Section: Investigation Of the Mechanisms Of Overlimiting Mass Transfementioning

confidence: 99%

See 1 more Smart Citation

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

et al. 2011

Journal of Membrane Science

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“…Since the analysis given in this paper is based on this assumption, experiments supporting our conclusions would serve to corroborate the underlying assumption of local equilibrium of the water-dissociation reaction. In particular, the techniques allowing for individual measurements of salt current and water-ion current, such as titration-based methods [26,27], are highly relevant, as many of our results and predictions depend explicitly on both these currents.…”

Section: Introductionmentioning

confidence: 99%

Transport-limited water splitting at ion-selective interfaces during concentration polarization

Nielsen

Bruus

2014

Phys. Rev. E

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We present an analytical model of salt-and water-ion transport across an ion-selective interface based on an assumption of local equilibrium of the water-dissociation reaction. The model yields current-voltage characteristics and curves of water-ion current versus salt-ion current, which are in qualitative agreement with experimental results published in the literature. The analytical results are furthermore in agreement with direct numerical simulations. As part of the analysis, we find approximate solutions to the classical problem of pure salt transport across an ion-selective interface. These solutions provide closed-form expressions for the current-voltage characteristics, which include the overlimiting current due to the development of an extended space-charge region. Finally, we discuss how the addition of an acid or a base affects the transport properties of the system and thus provide predictions accessible to further experimental tests of the model.

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“…(2) is valid for dilute solutions, which have been determined as solutions with solute concentrations below 0.1 M [24,25,26]. In this model the concentrations of some ion species are slightly higher, exceeding 0.5 M. However, we anticipate that applying eq.…”

Section: 1mentioning

confidence: 99%

Two-Dimensional Time-Dependent Numerical Modeling of Edge Effects in Dye Solar Cells

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A two-dimensional transient model of dye solar cells (DSC) describing the electrochemical reactions in the cell has been prepared. The model includes the relevant components of DSCs: the photoelectrode, the electrolyte, and the counter electrode. The solved variables are potential and the concentrations of the dierent ion species, which can be used to determine e.g. the current-voltage characteristics of the cell. The largest benet of this model is its 2D features which enable the study of lateral inhomogeneity. Using the model, a new phenomenon was described: lateral current density distribution caused by a small dierence in the size between photoelectrode and counter electrode, typical to laboratory test cells, causes tri-iodide to move from the edge region to the active area of the cell. This process takes relatively long time (8 min) and can be important for performance characterization and design of DSCs.

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Coupled transport phenomena in overlimiting current electrodialysis

Cited by 131 publications

References 8 publications

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Transport-limited water splitting at ion-selective interfaces during concentration polarization

Two-Dimensional Time-Dependent Numerical Modeling of Edge Effects in Dye Solar Cells

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