Concentration polarization with monopolar ion exchange membranes: currentâvoltage curves and water dissociation

Krol, J.J.; Weßling, Matthias; Strathmann, H.

doi:10.1016/s0376-7388(99)00133-7

Cited by 313 publications

(194 citation statements)

References 24 publications

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“…4.95). Moreover, similar decreasing trends of the l plateau values with the electrolyte concentration were also found in previous studies [106,107]. Kim and Lawler attributed the effect of the electrolyte concentration to an increase in the amount of ionic charge created in the space charge region [90].…”

Section: Role Of M +N Ions On Coupled Convectionsupporting

confidence: 87%

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

2012

Journal of Membrane Science

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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: Role Of M +N Ions On Coupled Convectionsupporting

confidence: 87%

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

2012

Journal of Membrane Science

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“…the first region of approximately ohmic behavior, the second region showing a plateau, and the third region of a rapid current increase governed by electroconvection) were observed in all the curves, proving that the membranes function as an ion-selective barrier. 26,27) Moreover, the pore-filled membranes exhibited excellent I-V properties comparable with those of the commercial membranes. The physical and electrochemical properties of the membranes are summarized in Table 2.…”

Section: )mentioning

confidence: 73%

Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

Kang¹

2013

Journal of the Korean Electrochemical Society

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: Thin pore-filled cation and anion-exchange membranes (PFCEM and PFAEMs, t m = 25-30 µm) were prepared using a porous polymeric substrate for efficient all-vanadium redox flow battery (VRB). The electrochemical and charge-discharge performances of the membranes have been systematically investigated and compared with those of commercially available ion-exchange membranes. The pore-filled membranes were shown to have higher permselectivity as well as lower electrical resistances than those of the commercial membranes. In addition, the VRBs employing the pore-filled membranes exhibited the respectable chargedischarge performances, showing the energy efficiencies (EE) of 82.4% and 84.9% for the PFCEM and PFAEM, respectively (cf. EE = 87.2% for Nafion 1135). The results demonstrated that the pore-filled ion-exchange membranes could be successfully used in VRBs as an efficient separator by replacing expensive Nafion membrane.

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“…This value of electric current is called the limiting current. Reaching limiting current, the concentration of cations on CM surface or the one of anions on AM surface becomes zero; the electric resistance of diluate cells sharply increases as a result of ion depletion and the water splitting takes place on the membrane surface in order to generate ions [10,11]. Changes in pH appear in cells, and the current efficiency of electrodialysis is decreased as a result of H + and OH -transport.…”

Section: Limiting Currentmentioning

confidence: 99%

A Novel Method for Limiting Current Calculation in Electrodialysis Modules

Káňavová

Machuča

2014

Period. Polytech. Chem. Eng.

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.1 ElectrodialysisElectrodialysis is an electrically-driven membrane separation process using ion exchange membranes to separate ions from the solution. The most frequent and well-known applications of electrodialysis are e.g. desalination of brackish water, production of edible salt from seawater, desalination of cheese whey, potassium tartrate removal from wine [1]. Electrodialysis has been successfully applied also in separation of organic acids, e.g. oxalic acid [2] and formic acid from wastewaters [3], to recover free malic acid from its salt [4] or to recover galacturonic acid from sugar beet pulp's pectin hydrolysate [5], and in food processing, e.g. desalting of soy sauce [6] or fruit juice deacidification [7]. Electrodialysis (ED) module is composed of a membrane stack placed between the cathode and the anode. The membrane stack consists of alternating cation and anion exchange membranes separated by spacers to form individual cells. Spacers separate membranes and provide mixing of the solution in cells.When the electric potential difference is applied, cations moving towards cathode can pass only through cation exchange membranes (CM) and anions moving towards anode can pass only through anion exchange membranes (AM), assuming absolute selectivity for counter-ions. That means the alternating arrangement of membranes enables the ion accumulation in the space defined by CM on the anode side and AM on the cathode side of the stack (concentrate cell). On the contrary, ions are removing from the space between AM on the anode side and CM on the cathode side of the stack (diluate cell). The electrodialysis performance can be affected by several process variables: membrane type, number of cell pairs, solution path length in the stack, applied voltage, flow rate and concentration of feed solution, temperature etc. [8,9].

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Concentration polarization with monopolar ion exchange membranes: currentâvoltage curves and water dissociation

Cited by 313 publications

References 24 publications

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

A Novel Method for Limiting Current Calculation in Electrodialysis Modules

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Concentration polarization with monopolar ion exchange membranes: currentâvoltage curves and water dissociation

Cited by 313 publications

References 24 publications

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Study of the effects of the applied current regime and the concentration of chromic acid on the transport of Ni2+ ions through Nafion 117 membranes

Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

A Novel Method for Limiting Current Calculation in Electrodialysis Modules

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Concentration polarization with monopolar ion exchange membranes: currentâvoltage curves and water dissociation