Effect of Ta–TiO2 Nanoparticles in Anion Exchange Membranes: Improved Hydroxide Ion Conductivity and Mechanical Strength for Alkaline Water Electrolysis Cells DOI Creative Commons
Ahmed Mohamed Ahmed Mahmoud, Kenji Miyatake,

Kaoru Tsujii

et al.

Macromolecular Chemistry and Physics, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 18, 2024

Abstract To improve the properties of quaternized QPAF‐4 copolymers as anion exchange membranes, compositing with hydrophilic Ta–TiO 2 particles are investigated. Flexible QPAF‐4/Ta–TiO composite membranes obtained using solution‐casting and die coating methods. Cross‐sectional scanning electron microscopy reveals that method produces a more homogenous uniform distribution in than method. The Ta‐TiO promotes suppression water absorbability dimensional swelling which is pronounced coated membranes. increase hydroxide ion conductivity to 116.9 mS cm −1 at 80 °C for die‐coated membrane, surpassing pristine membrane (92 ). survive 4 m KOH 1000 h, maintaining 96–112 (88–99% remaining) initial conductivity. All exhibit higher mechanical robustness (elongation >200%), optimized fabricated an alkaline electrolysis cell achieving 1.63 V 1.0 A −2 (75.5% efficiency).

Language: Английский

Comparative life cycle analysis of electrolyzer technologies for hydrogen production: Manufacturing and operations DOI Creative Commons
Xinyi Wei, Shivom Sharma,

Arthur Waeber

et al.

Joule, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

Citations

20
High‐Performance Anion Exchange Membrane Water Electrolyzers Enabled by Highly Gas Permeable and Dimensionally Stable Anion Exchange Ionomers DOI
Fanghua Liu, Kenji Miyatake,

Masako Tanabe

et al.

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

Citations

14
Turning Microstructure in Block Copolymer Membranes: A Facile Strategy to Improve CO2 Separation Performance DOI Creative Commons
Jing Wei, Min Deng,

Zikang Qin

et al.

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

Published: April 17, 2025

Abstract To mitigate global climate change, the development of membranes with high CO 2 permeability and selectivity is urgently needed. Here, a simple effective non‐solvent‐induced microstructure rearrangement (MSR) technique proposed to enhance gas separation performance Pebax 2533 membranes. By immersing in amino acid salt solutions induce MSR, optimized 2533‐GlyK 10 wt.% membrane reached 1180 Barrer, 4.5‐fold increase compared original membrane, without compromising /N selectivity. Moreover, MSR maintains stable for nearly 500 days, demonstrating excellent long‐term stability. Furthermore, applying thin‐film composite (TFC) revealed that both 2533/polyvinyl chloride (PVC) hollow fiber (HF) TFC 2533/polyacrylonitrile (PAN) flat‐sheet exhibited significantly enhanced permeance under treatment DI water. Characterization results indicated chemical‐physical properties before after are unchanged, suggesting promising next‐generation carbon capture.

Language: Английский

Citations

1
Ether‐Free Alkaline Polyelectrolytes for Water Electrolyzers: Recent Advances and Perspectives DOI
Chuan Hu, Yong Wang, Young Moo Lee

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Anion exchange membrane (AEM) water electrolyzers (AEMWEs) have attracted great interest for their potential as sustainable, environmentally friendly, low-cost sources of renewable energy. Alkaline polyelectrolytes play a crucial role in AEMWEs, determining performance and longevity. Because heteroatom-containing polymers been shown to poor durability alkaline conditions, this review focuses on ether-free polyelectrolytes, which are more chemically stable. The merits, weaknesses, challenges preparing AEMs summarized highlighted. evaluation synthesis methods polymers, modification strategies, cationic stability will provide insights valuable the structural design future polyelectrolytes. Moreover, situ degradation mechanisms ionomers during AEMWE operation revealed. This provides into AEMWEs accelerate widespread commercialization.

Language: Английский

Citations

8
Stability challenges of anion-exchange membrane water electrolyzers from components to integration level DOI

Ziyu Fang,

Chao Ye,

Tao Ling

et al.

Chem Catalysis, Journal Year: 2024, Volume and Issue: 4(10), P. 101145 - 101145

Published: Oct. 1, 2024

Language: Английский

Citations

6
Poly(fluorene)-Based Anion Exchange Membranes for High-Performance and Durable Alkaline Water Electrolyzers: Effect of the Pendent Ammonium Structure DOI Creative Commons
Vikrant Yadav, Kenji Miyatake, Ahmed Mohamed Ahmed Mahmoud

et al.

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

In the quest to realize mechanically and chemically robust, highly conductive anion exchange membranes (AEMs), herein, poly(fluorene)s with alkyl-tethered piperidinium (QPip-x; x stands for targeted ion capacity) or trimethylammonium (QAF-x) cations were synthesized, relation between cationic headgroup structure resulting membrane properties was investigated. AEMs rigid poly(fluorene) backbones decorated dihexyl hydrophobic chains as one of components head groups other component exhibited a good combination high hydroxide conductivity dimensional stability. Piperidinium cation-tethered demonstrated better chemical stability than during harsh alkaline tests in 8 M KOH at 80 °C 1000 h. particular, after this test, QPip-3.00 retained 78% its initial conductivity. The AEM water electrolysis (AEMWE) single cell integrated non-PGM anode catalyst (Ni0.8Co0.2O) achieved current density 2.0 A cm–2 low voltage 1.69 V. This operable h constant 1.0 minor decay 58.6 μV h–1 following jump. performance durability AEMWE proved promising applicability hydrogen-based electrochemical devices.

Language: Английский

Citations

0
Tuning Hydrogen Binding on Ru Sites by Ni Alloying on MoO2 Enables Efficient Alkaline Hydrogen Evolution for Anion Exchange Membrane Water Electrolysis DOI Creative Commons

Goeun Lee,

Sang Eon Jun, Jiheon Lim

et al.

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

Published: Jan. 13, 2025

Ruthenium (Ru)-based electrocatalysts have shown promise for anion exchange membrane water electrolysis (AEMWE) due to their ability facilitate dissociation in the hydrogen evolution reaction (HER). However, performance is limited by strong binding, which hinders desorption and re-adsorption. This study reports development of RuNi nanoalloys supported on MoO2, optimize binding strength at Ru sites through modulation adjacent Ni atoms. Theoretical simulations reveal that substituting atoms reduces high adsorption Gibbs free energy while maintaining a low barrier dissociation. As result, RuNi/MoO₂ catalyst shows excellent HER with overpotential 51 mV current density 100 mA cm⁻2, outperforming commercial Pt/C. Furthermore, demonstrates turnover frequency (7.06 s-1), mass activity (13.4 A mg-1), price (1030.77 dollar-1). In an AEMWE cell, as cathode achieves 1 cm-2 60 °C just 1.7 V using m KOH. work highlights potential ultra-high efficient applications.

Language: Английский

Citations

0
Poly(fluorene-co-alkyl)-based Polymers Bearing Pendant Piperidinium Cations for Alkaline Anion Exchange Membrane Fuel Cell Applications DOI
Fei Xu,

Yuyang Han,

Kai Huang

et al.

Chemistry of Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Language: Английский

Citations

0
Performance and Durability of Membrane Electrode Assemblies Using Ni-Based OER Catalysts for Anion Exchange Membrane Water Electrolysis DOI Creative Commons

Shiho Natori,

Sayaka Takahashi,

Toshio Iwataki

et al.

ACS Applied Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 27, 2025

Language: Английский

Citations

0
Poly(fluorene)‐Based Anion Exchange Membrane Demonstrating Excellent Durability at 1.5 A cm‒2 for 2400 h in Water Electrolyzers DOI

Haeryang Lim,

Nam In Kim, Gi Won Shin

et al.

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

Published: May 2, 2025

Abstract Anion exchange membrane water electrolyzer (AEMWE) is a cost‐effective alternative to proton for green hydrogen production. However, AEMWE commercialization hindered primarily by the lack of reliable anion (AEM) long‐term cell durability. In this study, poly(fluorene)‐based PFAA‐QA AEM developed with simple structure, exhibiting satisfactory OH − conductivity (>174.6 mS cm −1 at 80 °C), good mechanical properties (tensile strength >35 MPa and elongation break >51%), excellent alkaline stability (>2000 h in 3 m KOH °C). These characteristics allow PFAA‐QA‐based AEMWEs demonstrate high performance (3.95 A −2 70 °C 1.95 V) durability current densities (1.5 2400 Therefore, these surpasses that most low voltage decay rate (>29 mV kh ).

Language: Английский

Citations

0