Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)

Published: May 27, 2024

Abstract Electrochemical water splitting is a promising technique for the production of high‐purity hydrogen. Substituting slow anodic oxygen evolution reaction with an oxidation that thermodynamically more favorable enables energy‐efficient Moreover, this approach facilitates degradation environmental pollutants and synthesis value‐added chemicals through rational selection small molecules as substrates. Strategies small‐molecule electrocatalyst design are critical to electrocatalytic performance, focus on achieving high current density, selectivity, Faradaic efficiency, operational durability. This perspective discusses key factors required further advancement, including technoeconomic analysis, new reactor system design, meeting requirements industrial applications, bridging gap between fundamental research practical product detection separation. aims advance development hybrid electrolysis applications.

Language: Английский

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High-performance and durable anion-exchange membrane water electrolysers with high-molecular-weight polycarbazole-based anion-conducting polymer

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(15), P. 5399 - 5409

Published: Jan. 1, 2024

Development of high-performance and durable anion-exchange membrane water electrolysis enabled by chain-extender derived high-molecular-weight polycarbazole-based anion-conductive polymer.

Language: Английский

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Electrically Insulated Catalyst–Ionomer Anode Interfaces toward Durable Alkaline Membrane Electrolyzers

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(3), P. 1025 - 1034

Published: Feb. 16, 2024

Anion-exchange-membrane water electrolysis (AEMWE) is an emerging technology for scalable hydrogen production. AEMWE has poor durability when operating without supporting electrolyte due to the oxidation of ionomers and membranes in contact with anode oxygen evolution reaction (OER) catalyst. We report a new "passivated" architecture where OER catalysts are physically separated thin film amorphous oxide coating that electrically insulating but conductive hydroxide ions. find 2–3 nm HfOx passivation layers show sufficient ion transport minimally limit cell performance while suppressing ionomer degradation both Ir (500 mA·cm–2 40 h) CoOx (1.0 A·cm–2 100 model porous-transport-layer-supported AEMWE. This interfacial engineering approach guides electrode design improve AEMWE, particularly systems pure-water feed.

Language: Английский

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Anion Exchange Ionomers: Design Considerations and Recent Advances ‐ An Electrochemical Perspective

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(8)

Published: Oct. 28, 2023

Abstract Alkaline‐based electrochemical devices, such as anion exchange membrane (AEM) fuel cells and electrolyzers, are receiving increasing attention. However, while the catalysts methodically studied, ionomer is largely overlooked. In fact, most of studies in alkaline electrolytes conducted using commercial proton Nafion. The provides ionic conductivity; it also essential for gas transport water management, well controlling mechanical stability morphology catalyst layer. Moreover, has distinct requirements that differ from those anion‐exchange membranes, a high permeability, depend on specific electrode, management. As result, necessary to tailor structure application isolation part this review, an overview current state art ionomers provided, summarizing their limitations context AEM electrolyzers cells.

Language: Английский

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Recent progress in understanding the catalyst layer in anion exchange membrane electrolyzers – durability, utilization, and integration

EES Catalysis, Journal Year: 2023, Volume and Issue: 2(1), P. 109 - 137

Published: Nov. 7, 2023

This review discusses recent insights in catalyst layer design strategies for anion exchange membrane water electrolyzers, including electrode design, catalyst/ionomer integration, operational variables, situ diagnostics, and cell durability.

Language: Английский

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Enhancing Mass Transfer in Anion Exchange Membrane Water Electrolysis by Overlaid Nickel Mesh Substrate

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(8), P. 3719 - 3726

Published: July 5, 2024

Language: Английский

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Nickel Hydroxide‐Based Electrocatalysts for Promising Electrochemical Oxidation Reactions: Beyond Water Oxidation

Small, Journal Year: 2024, Volume and Issue: 20(33)

Published: March 20, 2024

Transition metal hydroxides have attracted significant research interest for their energy storage and conversion technique applications. In particular, nickel hydroxide (Ni(OH)

Language: Английский

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High‐Performance Anion Exchange Membrane Water Electrolyzers Enabled by Highly Gas Permeable and Dimensionally Stable Anion Exchange Ionomers

Advanced Science, Journal Year: 2024, Volume and Issue: 11(29)

Published: June 3, 2024

Abstract Designing suitable anion exchange ionomers is critical to improving the performance and in situ durability of membrane water electrolyzers (AEMWEs) as one promising devices for producing green hydrogen. Herein, highly gas‐permeable dimensionally stable (QC6xBA QC6xPA) are developed, which bulky cyclohexyl (C6) groups introduced into polymer backbones. QC6 50 BA‐2.1 containing mol% C6 composition shows 16.6 times higher H 2 permeability 22.3 O than that 0 without groups. Through‐plane swelling decreases 12.5% from 31.1% (QC6 BA‐2.1) while OH − conductivity slightly (64.9 56.2 mS cm −1 BA‐2.1, respectively, at 30 °C). The electrolysis cell using gas permeable ionomer Ni 0.8 Co 0.2 anode catalyst layer achieves two (2.0 A −2 1.69 V, IR‐included) those previous in‐house (QPAF‐4‐2.0) (1.0 IR‐included). During 1000 h operation 1.0 , exhibits nearly constant voltage with a decay rate 1.1 µV after initial increase voltage, proving effectiveness AEMWEs.

Language: Английский

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Electrodialysis as a key operating unit in chemical processes: From lab to pilot scale of latest breakthroughs

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 494, P. 153111 - 153111

Published: June 14, 2024

This review article comprehensively explores the significant advancements in electrodialysis (ED) technology within field of chemical engineering, presenting a holistic overview that spans fundamental principles, membrane materials and fabrication techniques, operational parameters, wide array applications. Unlike previous studies often narrow their focus to specific aspects ED, this work synthesizes global advances, bridging gaps between diverse research themes offer coherent understanding current trends future directions. membrane-based separation process driven by electric potential, is pivotal for its applications water purification, desalination, resource recovery, beyond. delves into evolution ion-exchange membranes, highlighting innovations materials, alongside advances techniques enhance selectivity efficiency. It also scrutinizes impact parameters on performance ED systems, addressing challenges like ion leakage, fouling, balance conductivity. Process intensification system optimization strategies are discussed, revealing how recent developments contribute energy efficiency, scalability, sustainability. The further extends emerging sectors ranging from environmental management hydrometallurgy industries, underscored case demonstrate practical implementations. Conclusively, underlines multidisciplinary approach required advancement technologies, suggesting avenues prioritize impact, economic feasibility, technological innovation. Through perspective, it aims catalyze exploration application some most pressing challenges.

Language: Английский

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Realizing Superior Durability of Water Electrolyzer Using Anion Exchange Membrane with an Interstitial Alkyl Chain: From a Single Cell to Large‐Sized 1‐cell Stack

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 10, 2024

Abstract Anion exchange membrane water electrolysis (AEMWE) has gained attention as an attractive alternative to alkaline and proton (PEMWE) due its high efficiency low hydrogen unit cost. However, the long‐term durability of AEMWE is ≈10 times lower than that PEMWE, which typically operates for 40 000 h. Here, a new design strategy presented aryl ether‐free PFPBPF‐QA anion membranes with interstitial alkyl chains in conducting groups polymer backbone. The rationally designed PFPBPF‐4‐QA, suitable ion capacity, shows ionic conductivity, mechanical properties, stability, stronger membrane‐ionomer contact properties at catalyst layers. A single cell using PFPBPF‐4‐QA demonstrated voltage decay rate 2 mV kh −1 1.0 cm −2 , significantly reported AEMWEs Nafion‐based PEMWEs. Additionally, large‐sized 1‐cell stack utilizing active area 63.6 achieved energy conversion 80.2% 1.5 h, over 90% initial maintained 49 095 h based on exponential fitting calculation.

Language: Английский

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