Optimizing shunt currents and pressure drop in bipolar alkaline electrolysers.
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| Title: | Optimizing shunt currents and pressure drop in bipolar alkaline electrolysers. |
|---|---|
| Authors: | Angulo, B. Acosta1 (AUTHOR) b.e.acosta.angulo@tue.nl, Van der Schaaf, J.1 (AUTHOR) j.vanderschaaf@tue.nl, Chatzichristodoulou, C.2 (AUTHOR) ccha@dtu.dk, de Groot, M.T.1 (AUTHOR) m.t.d.groot@tue.nl |
| Source: | International Journal of Hydrogen Energy. Aug2026, Vol. 256, pN.PAG-N.PAG. 1p. |
| Subjects: | Pressure drop (Fluid dynamics), Manifolds (Engineering), Electrolytic cells, Stray currents, Electrode efficiency, Ion flow dynamics |
| Abstract: | In alkaline electrolyzer stacks, mitigating shunt currents must be balanced against negative effects of pressure drop across flow compartments, as excessive pressure differences can compromise the operational safety. In particular, pressure differences between cathodic and anodic compartments can promote convective gas crossover. This work proposes a multiphysics model, derived from equivalent-circuit analysis, to simultaneously predict shunt currents, electrolyte flow distribution, and pressure drops in stack configurations with internal and external manifolds. The model couples voltage and pressure-drop calculations to evaluate the trade-off between Faradaic efficiency and the cathode-to-anode pressure difference (CTA Δ p). Model predictions show good agreement with state-of-the-art studies. Comparisons between traditional and modern electrolyzer designs indicate typical shunt-current losses of 1%–2% under nominal load. It is shown that the manifold size constrains the extent of shunt currents, whereas the inlet-flow configuration strongly influences CTA Δ p and flow uniformity across cells. A metaheuristic optimization algorithm shows that longer inlet channels combined with wider outlet compartments provide the best trade-off between Faradaic efficiency and operational safety. [Display omitted] • Manifold and channel design is a trade-off between faradaic efficiency and flow distribution. • The design can result in pressure differences between anolyte and catholyte. • Longer inlet channels provide more flexibility to tune the Faradaic efficiency of the stack. • Both internal and external manifolding enable high faradaic efficiencies of ∼ 99%. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 195465760 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Optimizing shunt currents and pressure drop in bipolar alkaline electrolysers. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Angulo%2C+B%2E+Acosta%22">Angulo, B. Acosta</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> b.e.acosta.angulo@tue.nl</i><br /><searchLink fieldCode="AR" term="%22Van+der+Schaaf%2C+J%2E%22">Van der Schaaf, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> j.vanderschaaf@tue.nl</i><br /><searchLink fieldCode="AR" term="%22Chatzichristodoulou%2C+C%2E%22">Chatzichristodoulou, C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> ccha@dtu.dk</i><br /><searchLink fieldCode="AR" term="%22de+Groot%2C+M%2ET%2E%22">de Groot, M.T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> m.t.d.groot@tue.nl</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hydrogen+Energy%22">International Journal of Hydrogen Energy</searchLink>. Aug2026, Vol. 256, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Manifolds+%28Engineering%29%22">Manifolds (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytic+cells%22">Electrolytic cells</searchLink><br /><searchLink fieldCode="DE" term="%22Stray+currents%22">Stray currents</searchLink><br /><searchLink fieldCode="DE" term="%22Electrode+efficiency%22">Electrode efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+flow+dynamics%22">Ion flow dynamics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In alkaline electrolyzer stacks, mitigating shunt currents must be balanced against negative effects of pressure drop across flow compartments, as excessive pressure differences can compromise the operational safety. In particular, pressure differences between cathodic and anodic compartments can promote convective gas crossover. This work proposes a multiphysics model, derived from equivalent-circuit analysis, to simultaneously predict shunt currents, electrolyte flow distribution, and pressure drops in stack configurations with internal and external manifolds. The model couples voltage and pressure-drop calculations to evaluate the trade-off between Faradaic efficiency and the cathode-to-anode pressure difference (CTA Δ p). Model predictions show good agreement with state-of-the-art studies. Comparisons between traditional and modern electrolyzer designs indicate typical shunt-current losses of 1%–2% under nominal load. It is shown that the manifold size constrains the extent of shunt currents, whereas the inlet-flow configuration strongly influences CTA Δ p and flow uniformity across cells. A metaheuristic optimization algorithm shows that longer inlet channels combined with wider outlet compartments provide the best trade-off between Faradaic efficiency and operational safety. [Display omitted] • Manifold and channel design is a trade-off between faradaic efficiency and flow distribution. • The design can result in pressure differences between anolyte and catholyte. • Longer inlet channels provide more flexibility to tune the Faradaic efficiency of the stack. • Both internal and external manifolding enable high faradaic efficiencies of ∼ 99%. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ijhydene.2026.156343 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Pressure drop (Fluid dynamics) Type: general – SubjectFull: Manifolds (Engineering) Type: general – SubjectFull: Electrolytic cells Type: general – SubjectFull: Stray currents Type: general – SubjectFull: Electrode efficiency Type: general – SubjectFull: Ion flow dynamics Type: general Titles: – TitleFull: Optimizing shunt currents and pressure drop in bipolar alkaline electrolysers. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Angulo, B. Acosta – PersonEntity: Name: NameFull: Van der Schaaf, J. – PersonEntity: Name: NameFull: Chatzichristodoulou, C. – PersonEntity: Name: NameFull: de Groot, M.T. IsPartOfRelationships: – BibEntity: Dates: – D: 03 M: 08 Text: Aug2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 03603199 Numbering: – Type: volume Value: 256 Titles: – TitleFull: International Journal of Hydrogen Energy Type: main |
| ResultId | 1 |
