Optimizing the Synergistic Effect of Co and Fe for Efficient and Durable Oxygen Evolution under Alkaline Conditions

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(27), P. 35200 - 35207

Published: June 27, 2024

Developing robust oxygen evolution reaction (OER) electrocatalysts is crucial for advancing anion exchange membrane water electrolysis (AEMWE). In this study, we present a catalyst optimizing the synergistic effect of Co and Fe by creating CoFe-based layer on Fe-based electrode (Fe@CoFe). The Fe@CoFe exhibits an overpotential 168 mV at 10 mA cm–2 under half-cell conditions current density A 2 V in AEMWE system with 1 M KOH. Moreover, it showcases degradation rate 76 μV h–1 2000 h 500 single-cell system. This study demonstrates feasibility achieving efficient durable using transition metal-based exclusively fabricated via electrodeposition.

Language: Английский

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Poly(aryl piperidinium)‐Based AEMs Utilizing Spirobifluorene as a Branching Agent

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(48)

Published: July 15, 2024

Abstract The high‐performance anion exchange membranes (AEMs) are developed by incorporating 9,9′‐spirobifluorene as a 3D branching agent, addressing the common trade‐off between ion conductivity and dimensional/mechanical stability. By fine‐tuning ratio of terphenyl to biphenyl amount AEM is refined, achieving high (≈190 mS cm −1 at 80 °C in 1 m KOH) with decent properties, comparable recently reported state‐of‐the‐art membranes. Investigations using gas pycnometer atomic force microscopy demonstrated that spirobifluorene enhances fractional free volume around membrane's backbone more precisely modulates separation hydrophobic hydrophilic domains, thus boosting both mechanical This membrane also displayed excellent chemical stability, negligible degradation KOH over 1,000 h. With such membrane, an cell performance achieved, current density 11.2 A − 2 V KOH, 1.8 pure water conditions. situ stability test, conducted constant for 500 h, showed no significant degradation.

Language: Английский

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Unveiling Key Descriptors of Ionomer Materials for Enhanced Electrochemical CO₂ Reduction

ACS Energy Letters, Journal Year: 2025, Volume and Issue: 10(1), P. 620 - 628

Published: Jan. 3, 2025

Polymeric ionomers near the catalyst surface of CO2 reduction reaction (CO2RR) electrodes affect their efficiency; however, multifaceted properties complicate structure–activity relationship elucidation. Here, we synthesized polycarbazole-based anion-exchange (QPC) bearing varying functionalized side chains to explore this relationship. Comprehensive analysis in physicochemical properties, electrochemical activity, and operando ATR-SEIRAS revealed that functional group modification significantly influenced intrinsic ionomer thereby affecting Ag microenvironments interfacial water structures, kinetics protonation step for CO2RR hydrogen evolution (HER). Notably, QPC-trimethyl phosphonium (TMP) induced favorable having a high proportion strong H-bonded with low Stark tuning slopes, which inhibit HER promote CO2RR. A CO Faradaic efficiency (>90%) was maintained using QPC-TMP membrane electrode assembly, even under concentrations (100–15%) elevated temperatures (28–72 °C). These findings suggest catalytic environment can be optimized by fine-tuning structure, contributing advancement high-performance ionomers.

Language: Английский

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Technology for Green Hydrogen Production: Desk Analysis

Energies, Journal Year: 2024, Volume and Issue: 17(17), P. 4514 - 4514

Published: Sept. 9, 2024

The use of green hydrogen as a high-energy fuel the future may be an opportunity to balance unstable energy system, which still relies on renewable sources. This work is comprehensive review recent advancements in production. outlines current consumption trends. It presents tasks and challenges economy towards hydrogen, including production, purification, transportation, storage, conversion into electricity. main types water electrolyzers: alkaline electrolyzers, proton exchange membrane solid oxide anion electrolyzers. Despite higher production costs compared grey this suggests that technologies become cheaper more efficient, cost expected decrease. highlights need for cost-effective efficient electrode materials large-scale applications. concludes by comparing operating parameters considerations different electrolyzer technologies. sets targets 2050 improve efficiency, durability, scalability underscores importance ongoing research development address limitations technology make competitive with fossil fuels.

Language: Английский

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Impact of Cross-Linking-Monomer Characteristics on Pore-Filling-Membrane Performance and Durability in Anion-Exchange Water Electrolysis

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(3), P. 1495 - 1495

Published: Feb. 1, 2025

This study investigates the development of pore-filling anion-exchange membranes (PFAEMs) for water-electrolysis applications. Ionomers using two different cross-linking monomers, namely hydrophilic C10 and hydrophobic C11, along with a common electrolyte monomer, E3, were compared in terms through-plane ion conductivity, hydrogen permeability, mechanical chemical stability, I-V polarization, durability. The results revealed that E3-C10 PFAEM exhibited 40% higher OH− conductivity (98.7 ± 7.0 mS cm−1) than E3-C11 similar ion-exchange capacity. improvement was attributed to improved separation domains, creating well-connected channels by C10. Alkaline stability tests demonstrated retained E3-C11, due absence ether linkages increased resistance nucleophilic attack. During operations, PFAEMs showed 10% better durability 87% lower confirming their suitability anion-exchange-membrane water electrolysis (AEMWE). Despite PFAEM, performance limited interfacial resistance. It is suggested ionomer-coated electrodes could further enhance AEMWE leveraging E3-C10. Overall, this provides valuable guidance on strategies utilizing electrolysis.

Language: Английский

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Advancing SnO₂-Based Water Dissociation Catalysis in Bipolar-Membrane Water Electrolyzers

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1633 - 1641

Published: March 12, 2025

Language: Английский

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Impact of crosslinking in poly(naphthalene-co-terphenyl piperidinium) copolymer for anion exchange membrane fuel cells

Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 112242 - 112242

Published: March 1, 2025

Language: Английский

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Deactivation Mechanism and Mitigation Strategies of Single‐Atom Site Electrocatalysts

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Single‐atom site electrocatalysts (SACs), with maximum atom efficiency, fine‐tuned coordination structure, and exceptional reactivity toward catalysis, energy, environmental purification, have become the emerging frontier in recent decade. Along significant breakthroughs activity selectivity, limited stability durability of SACs are often underemphasized, posing a grand challenge meeting practical requirements. One pivotal obstacle to construction highly stable is heavy reliance on empirical rather than rational design methods. A comprehensive review urgently needed offer concise overview progress stability/durability, encompassing both deactivation mechanism mitigation strategies. Herein, this first critically summarizes degradation induction factors at atomic‐, meso‐ nanoscale, mainly based but not oxygen reduction reaction. Subsequently, potential stability/durability improvement strategies by tuning catalyst composition, morphology surface delineated, including robust substrate metal‐support interaction, optimization active stability, fabrication porosity modification. Finally, challenges prospects for discussed. This facilitates fundamental understanding provides efficient principles aimed overcoming difficulties beyond.

Language: Английский

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A microphase separation anion exchange membrane based on poly(terphenyl piperidinium)/cationic polyelectrolyte for high-performance AEMWEs

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 124206 - 124206

Published: May 1, 2025

Language: Английский

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Polyphenylene‐Based Anion Exchange Membranes with Robust Hydrophobic Components Designed for High‐Performance and Durable Anion Exchange Membrane Water Electrolyzers Using Non‐PGM Anode Catalysts

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

Published: Sept. 29, 2024

Abstract Alkaline‐stable, highly conductive anion exchange membranes (AEMs) are attentively expected solid polymer electrolytes that contribute to achieving high performance and durability for membrane water electrolyzers (AEMWEs). The technical challenges of AEMs mainly stem from the degradation backbones, side chains, anchoring cationic groups. Herein, new stable (QTAF) designed using 3,3′′‐dichloro‐2′,5′‐bis(trifluoromethyl)‐1,1′:4′,1′′‐terphenyl (TFP) monomers as hydrophobic component incorporated into polyphenylene backbone 3,3′‐(2,7‐dichloro‐9H‐fluorene‐9,9‐diyl)bis(N,N‐dimethylpropane‐1‐amine) (AF) hydrophilic component. After tuning copolymer composition, highest hydroxide ion conductivity (168.7 mS cm −1 at 80 °C) is achieved with QTAF‐3.0 membrane. survives in harsh alkaline conditions (8 M KOH solution, °C), (75.8 ) after 810 h. A electrolysis cell non‐noble Ni 0.8 Co 0.2 O anode catalyst operates stably a constant current density (1.0 −2 1000 h negligible voltage increase rate 1.1 µV initial increase. post‐tested 1.83 V, only 6.4% 2.0 , suggesting potential practical AEMWE applications.

Language: Английский

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