Comparing Advanced Bipolar Membranes for High-Current Electrodialysis and Membrane Electrolysis

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 845 - 852

Published: Jan. 18, 2025

Advanced bipolar membranes (BPMs) with low water-dissociation overpotential (ηwd) may enable new electrochemical technologies for electrolysis, fuel cells, acid–base synthesis, brine remediation, lithium-battery recycling, and cement production. However, these advanced BPMs have only been demonstrated in BPM water electrolysis (BPMWE) configurations where the is under static compression by porous-transport layers. It important to study applications like electrodialysis large degrees of are not possible. We present a (BPMED) platform measure compare BPMWE BPMED systems. show half ηwd compared commercial while maintaining ∼90% current efficiency from 0.05–0.5 A cm–2. The values are, however, about 0.2 V higher at 0.5 cm–2 than those BPMWE. Regardless, results that developed optimized well-suited next-generation high-current-density technologies.

Language: Английский

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A Zero‐gap Electrolyzer Enables Supporting Electrolyte‐free Seawater Splitting for Energy‐saving Hydrogen Production

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

Abstract Membrane‐assisted direct seawater splitting (DSS) technologies are actively studied as a promising route to produce green hydrogen (H 2 ), whereas the indispensable use of supporting electrolytes that help extract water and provide electrochemically‐accelerated reaction media results in severe energy penalty, consuming up 12.5 % input when using typical KOH electrolyte. We bypass this issue by designing zero‐gap electrolyzer configuration based on integration cation exchange membrane bipolar assemblies, which protects stable DSS operation against precipitates corrosion absence additional electrolytes. The heterolytic dissociation function situ creates an asymmetric acidic‐alkaline environment, kinetically facilitating H O evolution reactions. When working natural without any chemical inputs, sustains nearly 100 Faradaic efficiency toward for 120 h at current density mA cm −2 . With high‐integrity merit, our can be facilely scaled into practical cell stacks with significantly increased active area prospects volume/space‐sensitive application scenarios. This concept opens underexplored design space energy‐saving production from low‐grade saline sources, being complementary to, potentially competitive pre‐purification Schemes.

Language: Английский

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Backbone Engineering of Polymeric Catalysts for High‐Performance CO₂ Reduction in Bipolar Membrane Zero‐Gap Electrolyzer

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(15)

Published: Feb. 13, 2024

Abstract Bipolar membranes (BPMs) have emerged as a promising solution for mitigating CO 2 losses, salt precipitation and high maintenance costs associated with the commonly used anion‐exchange membrane electrode assembly reduction reaction (CO RR). However, industrial implementation of BPM‐based zero‐gap electrolyzer is hampered by poor RR performance, largely attributed to local acidic environment. Here, we report backbone engineering strategy improve performance molecular catalysts in electrolyzers covalently grafting cobalt tetraaminophthalocyanine onto positively charged polyfluorene (PF‐CoTAPc). PF‐CoTAPc shows acid tolerance BPM (BPMEA), achieving FE 82.6 % at 100 mA/cm utilization efficiency 87.8 %. Notably, selectivity, carbon long‐term stability BPMEA outperform reported systems. We attribute enhancement stable cationic shield double layer suppression proton migration, ultimately inhibiting undesired hydrogen evolution improving selectivity. Techno‐economic analysis least energy consumption (957 kJ/mol) catalyst BPMEA. Our findings provide viable designing efficient environments.

Language: Английский

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Bipolar Membranes: A review on principles, preparation methods and applications in environmental and resource recovery

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160184 - 160184

Published: Feb. 1, 2025

Language: Английский

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Current progresses in the analysis, treatment and resource utilization of industrial waste salt in China: A comprehensive review

Resources Conservation and Recycling, Journal Year: 2025, Volume and Issue: 217, P. 108224 - 108224

Published: Feb. 28, 2025

Language: Английский

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Fast and selective ion transport in ultrahigh-charge-density membranes

Nature Chemical Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 11, 2025

Language: Английский

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Review on high‐performance polymeric bipolar membrane design and novel electrochemical applications

Aggregate, Journal Year: 2024, Volume and Issue: 5(4)

Published: March 4, 2024

Abstract Electrochemical devices allow the conversion and storage of renewable energy into high‐value chemicals to mitigate carbon emissions, such as hydrogen production by water electrolysis, dioxide reduction, electrochemical synthesis ammonia. Independent regulation electrode pH environment is essential for optimizing reaction kinetics enriching catalyst species. The in situ dissociation (WD, ) bipolar membranes (BPMs) offers possibility realizing this adjustment. Here, design principles high‐performance polymeric BPMs device applications are presented analyzing connecting WD current–voltage curves. structure–transport property relationships membrane durability, including chemical mechanical stability anion‐ cation‐exchange layers well integrality interfacial junction, systematically discussed. advantages new major challenges break through also highlighted. improved ion transport layer minimized overpotential ohmic loss at high current densities expected facilitate promotion from conventional novel applications.

Language: Английский

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Ultra-antiwetting Membrane for Hypersaline Water Crystallization in Membrane Distillation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(33), P. 14929 - 14939

Published: Aug. 10, 2024

Membrane distillation (MD) has great potential in the management of hypersaline water for zero liquid discharge (ZLD) due to its high salinity tolerance. However, membrane wetting issue significantly restricts practical application. In this study, a composite tailored extreme concentrations and even crystallization is synthesized by coating commercial hydrophobic porous with film containing dense polyamide layer, cation exchange layer (CEL), an anion (AEL). When used direct contact MD treating 100 g L

Language: Английский

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Toward a Circular Lithium Economy with Electrodialysis: Upcycling Spent Battery Leachates with Selective and Bipolar Ion-Exchange Membranes

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(43), P. 19486 - 19500

Published: Oct. 18, 2024

Recycling spent lithium-ion batteries offers a sustainable solution to reduce ecological degradation from mining and mitigate raw material shortages price volatility. This study investigates using electrodialysis with selective bipolar ion-exchange membranes establish circular economy for batteries. An experimental data set of over 1700 ion concentration measurements across five current densities, two compositions, three pH levels supports the techno-economic analysis. Selective (SED) isolates lithium ions battery leachates, yielding 99% Li-pure retentate 68.8% retention, achieving relative ionic fluxes up 2.41 Li+ transition metal cations selectivity 5.64 monovalent cations. Bipolar membrane (BMED) converts LiCl into high-purity LiOH HCl, essential remanufacturing reducing acid consumption via recycling. High densities leakage, leakage as low 0.03%, though hydronium hydroxide in BMED remains high at 11–20%. Our analysis projects production costs between USD 1.1 3.6 per kilogram, significantly lower than prices. Optimal SED conditions are identified, emphasizing need control proton transport improve cobalt–lithium separation enhance cost efficiency.

Language: Английский

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Asymmetric Bipolar Membrane for High Current Density Electrodialysis Operation with Exceptional Stability

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(11), P. 5596 - 5605

Published: Oct. 28, 2024

Bipolar membranes (BPMs) enable isolated acidic/alkaline regions in electrochemical devices, facilitating optimized environments for separations and catalysis. For economic viability, BPMs must attain stable, high current density operation with low overpotentials a freestanding configuration. We report an asymmetric, graphene oxide (GrOx)-catalyzed BPM capable of electrodialysis at 1 A cm–2 <250 mV. Use thin anion-exchange layer improves water transport while maintaining near unity Faradaic efficiency acid base generation. Voltage stability exceeding 1100 h average drift 70 μV/h 80 mA 100 −300 500 implementation stack demonstrate real-world applicability. Continuum modeling reveals that dissociation GrOx is both catalyzed electric-field enhanced, where pKa moieties on enhance local electric fields serve as active sites surface-catalyzed dissociation. These results establish commercially viable provide fundamental insight to advance design next-generation devices.

Language: Английский

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