Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Nagao, Yuki

doi:10.1080/14686996.2020.1722740

Cited by 29 publications

(21 citation statements)

References 117 publications

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“…In recent years, researchers have continued to develop proton exchange materials with excellent properties and low prices to replace the Nafion materials, such as conductive polymer materials, − conductive inorganic materials, − solid electrolytes, flexible polymers, etc. However, these materials have certain shortcomings in terms of stability, and their performance will be reduced under long-term use.…”

Section: Introductionmentioning

confidence: 99%

High Proton Conductivity of a Cadmium Metal–Organic Framework Constructed from Pyrazolecarboxylate and Its Hybrid Membrane

Wang

Zhang

et al. 2021

Inorg. Chem.

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A new type of metal−organic framework, [Cd 2 (pdc)(H 2 O)(DMA) 2 ] n (pdc = 3,5-pyrazoledicarboxylic acid; DMA = dimethylamine), named Cd-MOF, was synthesized and characterized. There are regular rectangular pore channels containing a large number of dimethylamine cations in the crystal structure. AC impedance test results show the proton conductivity of Cd-MOF reaches 1.15 × 10 −3 S cm −1 at 363 K and 98% RH. In order for its application in fuel cells, the Cd-MOF was introduced into a sulfonated polyphenylene oxide matrix to prepare a hybrid membrane, and the proton conductivity of the hybrid membrane has a high value of 2.64 × 10 −1 S cm −1 at 343 K and 98% RH, which is higher than those of most MOF polymer hybrid membranes. The proton conductivity of the hybrid membrane of the SPPO polymer still maintains a certain degree of stability in a wide temperature range. To the best of our knowledge, it is the first proton exchange membrane that combines pyrazolecarboxylate cadmium MOFs and an SPPO polymer with high proton conductivity and good stability. This research may help to further develop the application of MOFs in the field of proton exchange membrane fuel cells.

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Section: Introductionmentioning

confidence: 99%

High Proton Conductivity of a Cadmium Metal–Organic Framework Constructed from Pyrazolecarboxylate and Its Hybrid Membrane

Wang

Zhang

et al. 2021

Inorg. Chem.

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“…A slightly stronger peak occurs for CTA/PTZA–20 due to the organized aromatic triazole structure. The high proton conductivity has been accomplished with an ordered crystalline polymeric structure because the long‐range molecular ordered structure tends to allow passage of protons 32 …”

Section: Resultsmentioning

confidence: 99%

Composite proton exchange membrane of cellulose triacetate polymer integrated with polyacrylic acid and triazole based copolymer for balanced proton conduction and methanol permeability

Deepa

Sasikumar

Elakkiya

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Proton exchange membranes (PEMs) could prompt proton transport with long‐term oxidative and hydrolytic durability with little methanol crossover under humidified conditions. Cellulose triacetate (CTA)‐based PEMs were fabricated by reinforcing with 4 wt.% of polyacrylic acid (PAA) and polymerized triazole (PTZA) combination of acrylic acid/triazole acrylate copolymer. RESULTS The presence of PAA and PTZA copolymer in the CTA membrane was confirmed using Fourier transform infrared spectroscopy and X‐ray diffraction. The variations of proton conductivity, methanol crossover and water uptake of the PTZA copolymer‐reinforced CTA matrix were evaluated. Higher proton conductivity of 2.313 × 10−4 S cm−1 and minimal methanol permeability of 1.773 × 10−7 cm2 s−1 were obtained for the CTA/PTZA–20 membrane compared to a pristine CTA membrane. Furthermore, the oxidative tolerability was about 99.6% for CTA/PAA membrane, and hydrolytic stability was 97.78% for the CTA/PTZA–20 membrane, higher than that of the pristine CTA membrane. CONCLUSIONS The increase in proton conduction compared to pristine CTA membrane could be attributed to the presence of triazole moiety, which acts as a proton facilitator in the conduction process. Additionally, an increase in hydrolytic stability, oxidative tolerability and lower methanol crossover results indicated that the PTZA copolymer‐reinforced CTA PEMs have potential for use in fuel cell applications. © 2021 Society of Chemical Industry (SCI).

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“…This grain distribution can be recognized as the dominant and most common. On the other hand, it was observed that lamellar polycrystalline microstructures are also often encountered and desirable due to their strength, toughness, plasticity, and creep resistance properties [51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling of Grain Boundary Diffusion: Typical, Bi-Modal, and Semi-Lamellar Polycrystalline Coating Morphologies

2022

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Polycrystalline coatings and materials are widely used in engineering applications. Therefore, it is important to know their kinetics and mass transport mechanisms. The effect of grain boundaries (GBs) on diffusion in thin films with different morphologies lacks understanding. Numerical studies are necessary to study GB kinetics but are limited to simplified cases. The present work addresses the lack of diffusion studies in more complex morphologies. Diffusion in two-dimensional polycrystalline coatings of typical, bi-modal, and semi-lamellar morphologies was modeled and the influence of the microstructure on the diffusion regimes and the overall rate was identified. Different morphologies with similar diffusion coefficients provided different regimes. The regime depends not only on the total diffusivity and grain/GB diffusivities, but also on the morphological features of the surface. While the fast diffusion pathways of GBs accelerated diffusion, the level of acceleration depends on the morphology since fast pathways and flux areas are limited to GBs. GB distribution is important to the mass transfer process, as GBs accelerate diffusion locally. The overall diffusion rate is generally dependent on the diffusion coefficients ratio. Nevertheless, the level of this dependence relies on the morphology.

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Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Cited by 29 publications

References 117 publications

High Proton Conductivity of a Cadmium Metal–Organic Framework Constructed from Pyrazolecarboxylate and Its Hybrid Membrane

High Proton Conductivity of a Cadmium Metal–Organic Framework Constructed from Pyrazolecarboxylate and Its Hybrid Membrane

Composite proton exchange membrane of cellulose triacetate polymer integrated with polyacrylic acid and triazole based copolymer for balanced proton conduction and methanol permeability

Kinetic Modeling of Grain Boundary Diffusion: Typical, Bi-Modal, and Semi-Lamellar Polycrystalline Coating Morphologies

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