A model for the enhanced water dissociation on monopolar membranes

Danielsson, Carl-Ola; Dahlkild, Anders; Velin, Anna; Behm, Mårten

doi:10.1016/j.electacta.2008.12.025

Cited by 43 publications

(31 citation statements)

References 23 publications

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“…V B) of the experimental current-voltage curves [34]. However, such S-shaped currentvoltage curves are found even in our simple model, which suggests that they are a result of the transport properties of the system rather than the detailed reaction kinetics.…”

Section: Introductionmentioning

confidence: 46%

“…In certain limits, this result can be simplified to Eq. (34). The effects of water splitting are accounted for by Eq.…”

Section: Discussionmentioning

confidence: 99%

“…A number of models have been suggested to explain this remarkable feature. Some of these ascribe the increased reaction rate to catalytic interactions with membrane surface groups [25,31,32], while others use that the dissociation rate is increased in strong electric fields and employ a phenomenological function with one or more fitting parameters to describe this dependence [26,30,33,34]. In lack of conclusive evidence in support of either theory, the only thing that can be said with some confidence is that the actual reaction kinetics is probably exceedingly complicated.…”

Section: Introductionmentioning

confidence: 96%

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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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Section: Introductionmentioning

confidence: 46%

“…In certain limits, this result can be simplified to Eq. (34). The effects of water splitting are accounted for by Eq.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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

Nielsen

Bruus

2014

Phys. Rev. E

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“…To calculate pH mA , transport of protons and hydroxyl ions from bulk solution into the electrode must be considered. 80,81 However, when there is no proton/hydroxyl ion transport, as in the steady-state, and in case there is no role for protons in the charge-transfer reaction, then pH mA =pH ∞ +φ/ln10 with φ (as throughout this work) the potential in the macropores (and in the SDL). Thus we arrive at …”

Section: Edlmentioning

confidence: 99%

Electrochemistry and capacitive charging of porous electrodes in asymmetric multicomponent electrolytes

2012

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“…Our model approach is generic, allowing successful prediction for electrokinetic transport and hydrodynamic flow through nanochannels. It will be used as a base for further refinements by taking into account additional effects such as ion crowding [12] and/or more complex electrochemical interactions [13] such as specific ion adsorption or field-enhanced water dissociation.…”

Section: Resultsmentioning

confidence: 99%

Electrostatic gating of ion and molecule transport through a nanochannel-array membrane

Pardon

Wijngaart

2011

2011 16th International Solid-State Sensors, Actuators and Microsystems Conference

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This work presents a predictive and today's most complete model for electrostatic gating of nanofluidic channels. The model is based on the classical mean field equations and accounts for the surface reactivity. The model is successfully verified against previously published experimental data [1]. The fabrication concept of a novel device is introduced and its predicted performances are discussed with the help of the presented model. A ~40x performance improvement, in terms of tunability of the ionic conductivity in the nanochannel, in comparison to the result presented in [1], is expected.

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A model for the enhanced water dissociation on monopolar membranes

Cited by 43 publications

References 23 publications

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

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

Electrochemistry and capacitive charging of porous electrodes in asymmetric multicomponent electrolytes

Electrostatic gating of ion and molecule transport through a nanochannel-array membrane

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