Опубликована: Янв. 1, 2024
Язык: Английский
Carbohydrate Polymers, Год журнала: 2024, Номер 348, С. 122939 - 122939
Опубликована: Ноя. 4, 2024
Язык: Английский
Процитировано
3
Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 160244 - 160244
Опубликована: Фев. 1, 2025
Язык: Английский
Процитировано
0
ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown
Опубликована: Фев. 27, 2025
Nanocellulose has shown significant potential in the field of proton exchange membranes (PEMs) because its low cost, biodegradability, excellent thermal stability, and high designability. However, development is limited by mechanical stability conductivity. In this study, cellulose nanofibers (CNFs) nanocrystals (CNCs) were blended as a composite matrix (CNF/CNC), stable metal–organic framework (MOF) with −SO3H (S-UIO-66) was prepared on surface carbon nanotubes (CNTs) via an situ growth procedure. The S-UIO-66@CNT subsequently introduced filler into CNF/CNC dispersion, PEMs formed filtration. itself exhibited certain uniform dispersion due to presence groups; incorporation CNFs/CNCs (CCs) further enhanced S-UIO-66 more unobstructed conduction pathways established membrane. As consequence, resulting PEM (CC/S-UIO-66@CNT-5) developed superior properties (93 MPa) conductivities (0.105 S/cm at 80 °C 100% RH 27 mS/cm 33% RH). addition, battery performance tests showed promising for application fuel cells.
Язык: Английский
Процитировано
0
Journal of Physics and Chemistry of Solids, Год журнала: 2025, Номер unknown, С. 112705 - 112705
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
0
Advanced Energy Materials, Год журнала: 2025, Номер unknown
Опубликована: Май 22, 2025
Abstract The transition of a material from academia to industry is significant interest. Although extensive efforts have been devoted toward design and development various crystalline solid‐state proton conductors (SSPCs) such as MOFs/CPs, COFs, HOFs, POMs with impressive conductivity up 10 −2 – −1 S cm , less attention has paid verify their potentiality via membrane electrode assembly (MEA) construction for the usage in H 2 /O fuel cells, which ultimate goal R&D. Herein, we aim highlight MEA fabricated SSPCs validate reliability practicality cells. An in‐depth discussion comparison several industrially relevant parameters open circuit voltages, power density, current durability assessments along operating conditions key this contribution. Most importantly, ‘Critical Analysis’ section provides critical thoughts on so far developments performance four sorts materials pros cons, while identification existing issues future recommendations made ‘Future Prospects’ section, will be beneficial chemists getting sufficient new chemical insights interest engineers cell partners.
Язык: Английский
Процитировано
0
Small, Год журнала: 2025, Номер unknown
Опубликована: Май 24, 2025
Abstract High‐temperature proton exchange membranes (HT‐PEMs) are highly desired for fuel cells with high energy density; however, the requirements in balanced anhydrous conductivity, mechanical/structural stability, processability and gas‐barrier property impose great difficulty molecular design. Herein, supramolecular complexation of brush polymers super acidic metal oxide cluster (H 3 PW 12 O 40 , abbreviation ) affords HT‐PEMs comprehensive performance that contributes to robust density cells. The topology enables decoupling mechanical properties conduction: polyethylene glycol (PEG) side chains possess affinity transport while rigid backbones help maintain structural stability strengths up 250 °C. clusters can be homogeneously dispersed PEG loadings (≈80 wt.%) it facilitates hopping among crowded promising conduction, e.g., 2 × 10 −3 S cm −1 at 200 Their dense bonds contribute enhanced strength, flexibility gas barrier mitigating hydrogen permeation current as 0.73 mA −2 enabling feasible PEMs stable operation devices show power 218 mW 180 °C long‐term operation.
Язык: Английский
Процитировано
0
Chemistry - A European Journal, Год журнала: 2024, Номер unknown
Опубликована: Авг. 19, 2024
As the key component of various energy storage and conversion devices, proton exchange membranes (PEMs) have been attracting significant interest. However, their further development is limited by high cost perfluorosulfonic acid polymers poor stability acid-dopped non-fluorinated polymers. Recently, a new group PEMs has developed hybridizing polyoxometalates (POMs), super acidic sub-nanoscale metal oxide clusters, with POMs can serve simultaneously as both sponges stabilizing agents, complexation improve polymers' mechanical performance processability. Enormous efforts focused on studying supramolecular or covalent grafting to optimize in terms cost, properties stabilities. This concept summarizes recent advances this emerging field outlines design strategies application perspectives employed for using POM-polymer hybrid materials PEMs.
Язык: Английский
Процитировано
2
Accounts of Chemical Research, Год журнала: 2024, Номер unknown
Опубликована: Окт. 3, 2024
ConspectusMolecular clusters (MCs) are monodispersed, precisely defined ensembles of atom collections featured with shape-persistent architectures that can deliver certain functions independently. Their molecular compositions and surface functionalities be tailored feasibly in a predefined manner, they applied as basic structural units to engineered into materials desirable hierarchical structures enriched functions. The chemical systems also offer great opportunities for the design fabrication soft without chain topologies polymers. bulks MC assemblies demonstrate viscoelasticity is used considered unique feature polymers, while distinct from polymers since their elasticities resilient even at temperatures 100 K above glass transition temperatures. understanding anomalous extended studies general structure-property relationships desired development new emergent possibilities resolve intrinsic trade-offs traditional materials.Meanwhile, macroscopic or properties related transportation mass, momentum, and/or energy, basically realized directed by motions different length scales. Structural relaxation dynamics research critical quantifying ranging fast bond deformation, break/formation, diffusion ions particles cooperative structure units. Due advancement measurement technology (e.g., quasi-elastic scattering broadband dielectric spectroscopy), have been probed first time, multiple modes across several temporal scales were systematically studied bridge correlation between fingerprint information studies, e.g., temperature dependence time property, ion conductivity, was proposed quantify relationship, microscopic mechanism on mechanical properties, conduction, gas absorption separation fully understood.In this Account, elucidate uniqueness materials, especially comparison four topics mainly summarized: features, characterization techniques, characteristics, quantified relationship. capability function prediction introduced, typical example impact resistant provided. Account aims prove significance material innovation, it confirms potential MCs functional fabrications.
Язык: Английский
Процитировано
2
Advanced Functional Materials, Год журнала: 2024, Номер 34(48)
Опубликована: Июнь 29, 2024
Abstract An ionomer strategy is introduced to deal with two major performance‐limiting issues for the proton exchange membrane fuel cells (PEMFCs) operating under low platinum (Pt) and humidity. Specifically, highly hydrophilic multiple‐valence Anderson‐type polyoxometalate (POM) cluster, [MnMo 6 O 18 (OH) ] 3− , chosen covalently graft perfluorinated polymer, substituting sulfonate groups as carriers in perfluorosulfonic acid (PFSA). The structural electrochemical characterizations indicate that this POM large size, charges delocalization among multiple terminal oxygen atoms, high hygroscopicity, can prevent adsorption, which believed induce dense backbone crystallization hinder 2 permeation at Pt/PFSA interface, lead assemblies well‐connected domains, are recognized channels efficient transport well conduction. Besides, involvement of redox Mn ions clusters makes have capability scavenge peroxides, known chemical agents degrade MEA components. Consequently, fuel‐cell cathodes using POM‐grafted ionomers exhibit significantly lower local resistance higher conductivity compared PFSA‐based electrodes; accordingly, much‐increased output performance 50% relative humidity impressive stability.
Язык: Английский
Процитировано
1
Industrial & Engineering Chemistry Research, Год журнала: 2024, Номер 63(34), С. 15012 - 15022
Опубликована: Авг. 15, 2024
Polyvinyl butyral (PVB) boasts many applications, yet its synthesis often suffers from oversizing agglomeration, resulting in limited product purity and thus large energy consumption waste emission for purification. This study the first time demonstrates that incorporating NaNO3 as an additive can prevent agglomeration to offer high-purity finely sized PVB products. functions a removable recyclable dispersant enable uniform acetalization of poly(vinyl alcohol) with n-butanal acidic aqueous media at ambient temperatures. The salting-in effect diminishes hydrophobic interaction polymers, improving dispersion preventing runaway. In contrast conventional systems, NaNO3-assisted temperature offers multiple sustainable benefits, including suppression on byproducts, conservation, reduction emission, reusability postacetalization medium. finding valuable complementary strategy deserves exploration massive production.
Язык: Английский
Процитировано
1