Current losses in a bipolar cell — II: An analysis of the Butler–Volmer regime

Rangarajan, S.K.; Yegnanarayanan, V.; Muthukumar, Muthuraman

doi:10.1016/s0013-4686(98)00002-4

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…The asymmetry can be expected to increase with increase in the membrane resistance. These intuitively appealing results are in qualitative accordance with published literature [7,8]. However, a quantitative agreement with relevant experimental data establishes full validation of the model.…”

Section: Resultssupporting

confidence: 89%

“…It is an established practice to represent an electrolyzer stack by an equivalent circuit [3][4][5][6][7][8]. This inherently involves the assumption of uniform current distribution along the electrodes.…”

Section: Description Of the Modelmentioning

confidence: 99%

“…A general equation for the computation of electrode over-voltage is the Butler-Volmer Equation [8]. However, Tafel equation [7] is a very good approximation for the current potential relationship when the applied current is significantly higher than the electrode exchange current.…”

Section: Description Of the Modelmentioning

confidence: 99%

“…Several papers dealt with the modeling of leakage currents in a bipolar electrolyzer stack [3][4][5][6][7][8]. Kuhn and Booth [3] reviewed the origins of bipolar leakage currents and computed leakage currents by modifying the zenor diode representation of the cell by Katz [4].…”

Section: Introductionmentioning

confidence: 99%

“…In order to keep the model simple, they neglected the effect of the presence of gases in the outlet ports and manifolding. In a subsequent paper, Rangarajan et al [8] extended the model for current densities close to the electrode exchange current densities by including the effects of electrode over voltages by Butler-Volmer expressions.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of shunt currents in a bipolar electrolyzer stack by difference calculus

Jupudi,

Zappi,

Bourgeois

2007

J Appl Electrochem

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A model for predicting shunt/leakage currents in a bipolar electrolyzer stack with dual electrolyte inlets and significant amount of gases in the outlet ports and manifold is presented. Model includes electrolyte, manifold and membrane separator as resistance components in the electric circuit analog of the stack. Activation overvoltage associated with electrodes is taken as Tafel-like. Current balance and potential balance equations are applied to the stack and difference calculus is employed to reduce the problem to a set of linear difference equations with constant coefficients. The model is validated with published results and the effect of each resistance component and number of cells on leakage currents in the stack is presented.

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Section: Resultssupporting

confidence: 89%

Section: Description Of the Modelmentioning

confidence: 99%

Section: Description Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of shunt currents in a bipolar electrolyzer stack by difference calculus

Jupudi,

Zappi,

Bourgeois

2007

J Appl Electrochem

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The Mechanism and Modelling of Shunt Current in the Vanadium Redox Flow Battery

Skyllas‐Kazacos

McCann

et al. 2016

ChemistrySelect

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To date, no physical model has been proposed to describe the mechanism of shunt currents in bipolar electrochemical reactors with a common electrolyte manifold. In this paper, we show that under the influence of the cell voltage driving force, the bipolar electrode provides an internal electrical pathway that allows electrons to flow from the negative half-cell of one cell, to the positive half-cell of the adjacent cell, leading to self-discharge reactions that can occur even when the stack is at open-circuit. This is made possible, by the presence of the interconnecting channels and common electrolyte manifolds that enable the flow of hydrogen or other charge carrying ions to complete the circuit. The larger the number of cells in the cell stack, the larger the number of internal pathways for electrons and protons to flow, so the greater the shunt current losses.[a] Prof.

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