Poly(spirofluorene)-Based Anion Exchange Membranes for Alkaline Electrochemical Energy Devices DOI
Tao Wang, Weizhe Zhang, Tie Wang

et al.

Macromolecules, Journal Year: 2024, Volume and Issue: 57(11), P. 5461 - 5471

Published: May 28, 2024

Anion exchange membranes (AEMs) with high conductivity and low hydrogen permeability guarantee efficient reliable AEM fuel cells (AEMFCs) water electrolyzers (AEMWEs). In this work, two monomeric spirofluorenes, spiro[cyclopentane-1,9′-fluorene] (CPF) spiro[cyclohexane-1,9′-fluorene] (CHF), were synthesized by a ring-closing reaction further embedded into the poly(arylene alkylene) backbone to lower ion transport resistance without compromising gas barrier property of AEM. The π–π stacking polymer is weakened introduction spirofluorene units, contributing increased intermolecular spacing improved microporous contents. On other hand, despite presence spirocyclic an affordable specific H2 permeation 28 pmol cm–1 s–1 was observed for Moreover, excellent hydroxide 169 mS at 80 °C also recorded owing rapid caused microporosity. Benefiting from good performance AEM, engineered AEMFC based on PCHTPA exhibits peak power density 1.3 W cm–2 in situ durability 330 h. AEMWE shows current 3.2 A 2.0 V Faradaic efficiency 98.4% purity 99.92%.

Language: Английский

Designing Gemini‐Electrolytes for Scalable Mg2+/Li+ Separation Membranes and Modules DOI Open Access
Huawen Peng,

Yafei Su,

Xufei Liu

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(51)

Published: Aug. 30, 2023

Abstract High performance polyamide nanofiltration membranes play important roles in Mg 2+ /Li + separation and Li extraction, but they are prepared via multiple time‐/labor demanding steps. Both the scalability of these engineering membrane modules remain an elusive challenge. Here design a Gemini‐electrolyte monomer (GEM) featuring bidentate amine groups, quaternary ammonia, endocyclic contorted conformation is reported. The monomer's low interfacial diffusivity balanced by high condensational reactivity during its polymerization with trimesoyl chloride (TMC), leading to straightforward formation defect‐free, ≈14 nm thick membranes. shows highest permeance (≈19.2 L m −2 h −1 bar ) among without post‐modification, combined good selectivity (≈15.4) stability. validity GEM verified control monomers. Large‐area (1 × 2 GEM‐TMC spiral‐wound (effective area: 0.5 prepared, both which show reproducible performance.

Language: Английский

Citations

53
The need for ion-exchange membranes with high charge densities DOI Creative Commons
David Kitto, Jovan Kamcev

Journal of Membrane Science, Journal Year: 2023, Volume and Issue: 677, P. 121608 - 121608

Published: March 23, 2023

Language: Английский

Citations

45
Recent Advances and Challenges in Anion Exchange Membranes Development/Application for Water Electrolysis: A Review DOI Creative Commons
Lu Liu, Hongyang Ma,

Madani Khan

et al.

Membranes, Journal Year: 2024, Volume and Issue: 14(4), P. 85 - 85

Published: April 5, 2024

In recent years, anion exchange membranes (AEMs) have aroused widespread interest in hydrogen production via water electrolysis using renewable energy sources. The two current commercial low-temperature technologies used are alkaline (AWE) and proton membrane (PEM) electrolysis. AWE technology exhibited the advantages of high stability increased cost-effectiveness with low efficiency. contrast, PEM efficiency cost-effectiveness, respectively. Unfortunately, major challenges that AEMs, as well corresponding ion transportation membranes, including separator still face efficiency, long-term stability, under working conditions, which critical issues need to be addressed a top priority. This review comprehensively presented research progress on AEMs providing thorough understanding academic studies industrial applications. It focused analyzing chemical structure polymers performance established relationship between membranes. aimed identify approaches for improving AEM conductivity stability. Additionally, future directions commercialization were discussed based analysis assessment applications patents.

Language: Английский

Citations

17
Multiscale Understanding of Anion Exchange Membrane Fuel Cells: Mechanisms, Electrocatalysts, Polymers, and Cell Management DOI Creative Commons
Hui-yu Lei, Xiaohua Yang, Zhangsen Chen

et al.

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

Published: Jan. 10, 2025

Abstract Anion exchange membrane fuel cells (AEMFCs) are among the most promising sustainable electrochemical technologies to help solve energy challenges. Compared proton (PEMFCs), AEMFCs offer a broader choice of catalyst materials and less corrosive operating environment for bipolar plates membrane. This can lead potentially lower costs longer operational life than PEMFCs. These significant advantages have made highly competitive in future cell market, particularly after advancements developing non‐platinum‐group‐metal anode electrocatalysts, anion membranes ionomers, understanding relationships between conditions mass transport AEMFCs. review aims compile recent literature provide comprehensive three key areas: i) mechanisms hydrogen oxidation reaction (HOR) oxygen reduction (ORR) alkaline media; ii) synthesis routes structure‐property cutting‐edge HOR ORR as well ionomers; iii) conditions, including water management impact CO 2 . Finally, based on these aspects, development perspectives proposed.

Language: Английский

Citations

3
Unveiling Key Descriptors of Ionomer Materials for Enhanced Electrochemical CO2 Reduction DOI

Wonsang Jung,

Sang‐Hun Shin, Sejin Park

et al.

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

Citations

2
Alkyl side-chain engineering to induce distinct microphase separation in random poly(phenylene piperidinium) ionomers for anion-exchange membrane fuel cells DOI
Qi Lei,

Chao Ge,

Na Li

et al.

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 123743 - 123743

Published: Jan. 1, 2025

Language: Английский

Citations

2
Ionic-Nanophase Hybridization of Nafion by Supramolecular Patching for Enhanced Proton Selectivity in Redox Flow Batteries DOI

Liang Zhai,

You‐Liang Zhu, Gang Wang

et al.

Nano Letters, Journal Year: 2023, Volume and Issue: 23(9), P. 3887 - 3896

Published: April 24, 2023

Nafion, as the mostly used proton exchange membrane material in vanadium redox flow batteries (VRFBs), encounters serious permeation problems due to large size difference between its anionic nanophase (3-5 nm) and cationic ions (∼0.6 nm). Bulk hybridization usually suppresses at expense of conductivity since conventional additives tend randomly agglomerate damage continuity from unsuitable sizes intrinsic incompatibility. Here, we report ionic-nanophase strategy Nafion membranes by using fluorinated block copolymers (FBCs) polyoxometalates (POMs) supramolecular patching additives. The cooperative noncovalent interactions among interfacial-active FBCs, POMs can construct a 1 nm-shrunk ionic with abundant transport sites, preserved continuity, efficient screeners, which leads comprehensive enhancement conductivity, selectivity, VRFB performance. These results demonstrate intriguing potential precisely tuning nanostructured electrolyte for improved

Language: Английский

Citations

36
Host-guest coordination self-assembly gives anion exchange membranes better stability DOI Open Access

Yongjiang Yuan,

Xinming Du,

Zhiyan Sui

et al.

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 464, P. 142563 - 142563

Published: March 24, 2023

Language: Английский

Citations

23
Towards highly conducting and stable poly(fluorenyl biphenyl)-based anion exchange membranes by grafting dual Y-shaped side-chains DOI
Xiaofeng Wan, Xiangtai Wei, Jinming Ge

et al.

Journal of Membrane Science, Journal Year: 2023, Volume and Issue: 680, P. 121760 - 121760

Published: May 19, 2023

Language: Английский

Citations

23
Microporous membrane with ionized sub-nanochannels enabling highly selective monovalent and divalent anion separation DOI Creative Commons
Mei‐Ling Liu,

Yu Chen,

Chuan Hu

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 23, 2024

Membranes tailored for selective ion transport represent a promising avenue toward enhancing sustainability across various fields including water treatment, resource recovery, and energy conversion storage. While nanochannels formed by polymers of intrinsic microporosity (PIM) offer compelling solution with their uniform durable nanometer-sized pores, effectiveness is hindered limited interactions between ions nanochannel. Herein, we introduce the randomly twisted V-shaped structure Tröger's Base unit quaternary ammonium groups to construct ionized sub-nanochannel window size 5.89–6.54 Å anion hydration Stokes diameter, which enhanced dehydrated monovalent transport. Combining sieving electrostatic interaction effects, membranes achieved exceptional selectivity 106 Cl-/CO32- 82 Cl-/SO42-, significantly surpassing state-of-the-art membranes. This work provides an efficient template creating functionalized sub-nanometer channels in PIM membranes, paves way development precise separation applications. but hinders effectiveness. Here, authors demonstrate ions.

Language: Английский

Citations

13