Solution blown biofunctionalized poly(vinylidene fluoride) nanofibers for application in proton exchange membrane fuel cells

Wang, Hang; Ma, Youwei; Cheng, Bowen; Kang, Weimin; Li, Xiaojie; Shi, Lei; Cai, Zhanjun

doi:10.1016/j.electacta.2017.10.071

Cited by 37 publications

(24 citation statements)

References 37 publications

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“…Wang et al fabricated composite membranes by impregnating oxidized cysteine-functionalized PVDF NFs into the Nafion matrix. The composite membranes exhibited the highest proton conductivity of 220 mS·cm −1 (80 °C, 100% RH) and a maximum power density of 108.42 mW·cm −2 (60 °C, 100% RH), almost twice that of the Nafion 117 membrane [ 156 ]. Table 7 summarizes the characteristics of the reported NF composite IEMs containing acid-base pairs.…”

Section: Applications Of Nanofiber-based Iemsmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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The unique functions of nanofibers (NFs) are based on their nanoscale cross-section, high specific surface area, and high molecular orientation, and/or their confined polymer chains inside the fibers. The introduction of ion-exchange (IEX) groups on the surface and/or inside the NFs provides de novo ion-exchangers. In particular, the combination of large surface areas and ionizable groups in the IEX-NFs improves their performance through indices such as extremely rapid ion-exchange kinetics and high ion-exchange capacities. In reality, the membranes based on ion-exchange NFs exhibit superior properties such as high catalytic efficiency, high ion-exchange and adsorption capacities, and high ionic conductivities. The present review highlights the fundamental aspects of IEX-NFs (i.e., their unique size-dependent properties), scalable production methods, and the recent advancements in their applications in catalysis, separation/adsorption processes, and fuel cells, as well as the future perspectives and endeavors of NF-based IEMs.

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Section: Applications Of Nanofiber-based Iemsmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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“…Then, the weight and area were measured quickly (measured three times to average). WU and SR were calculated by using the following equation [ 1,68 ] :

\begin{matrix} WU = \frac{W_{wet} - W_{dry}}{W_{dry}} \times 100 % \end{matrix}

\begin{matrix} SR = \frac{S_{wet} - S_{dry}}{S_{dry}} \times 100 % \end{matrix}

where W wet and W dry were the water swollen membrane weight and the dry membrane weight, respectively, and S wet and S dry were the water swollen membrane area and the dry membrane area, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Nafion, as a random copolymer, large differences in molecular structure and property between the hydrophilic sulfonic acid group and hydrophobic backbone result in the separation of natural nanophase, [ 1–6 ] which allows forming a prototypical bicontinuous nanophase in NF matrix and a rich nanochannel linkage at its hydrated state, [ 7–12 ] thus transporting proton rapidly in nanochannel by hopping/vehicular. [ 13,14 ] This spatial molecular structure makes NF the most practical PEMs for the fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

Jin

Yan

Zhao

et al. 2020

Adv Materials Inter

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Construction of long‐range interconnected ionic channels in proton exchange membranes (PEMs) is the key to realize anisotropic proton transportation. But, how to effectively modulate ionic channels at the molecular level still remains a great challenge for modern nanoenergy technology. Here, surface enriched sulfonic acid ionic clusters in Nafion (NF)/ZnO nanofibers are successfully designed and fabricated as long‐range interconnected ionic channels, in which the ZnO nanofiller (nano‐ZnO) act as an inducer to enable the spatial deformation and inversion of sulfonic acid groups in NF molecule from the inside to the surface of the NF/ZnO nanofibers, due to the strong intermolecular electrostatic interactions between nano‐ZnO and the CF2 of NF backbones. The phenomenon and molecular mechanism are visually confirmed by physicochemical analysis. Ultimately, the NF/ZnO nanofibers demonstrate the relative higher of proton conductivity up to 253.2 mS cm‐1 and power density of 115.72 mW cm‐2 than that of reported NF‐based PEMs. This study, for the first time, reveals that the surface enrichment of sulfonic acid ionic clusters is an efficient strategy to construct long‐range interconnected ionic channels in the NF‐based PEMs, proves that the formation of the ionic channels could be efficiently modulated by controlling the molecular activity and morphology of nanofiller.

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“…1 Wang et al claimed that the incorporation of amino acid functionalize nanofibers enhanced the proton conductivity in sulfonated poly(ether sulfone) (SPES) membrane. 2 Pena-Francesch et al reported outstanding proton conductivity of stretchable and self-healing of synthetic tandem repeat polypeptides based on cephalopod proteins. 3 Even though the reported biomaterials show impressive proton conduction performance, further investigation of the proton transportation mechanism is necessary.…”

Section: Introductionmentioning

confidence: 99%

Interfacial and Internal Proton Conduction of Weak-acid Functionalized Styrene-based Copolymer with Various Carboxylic Acid Concentrations

et al. 2021

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Investigation of interfacial proton transport is necessary to elucidate biological systems. As commonly found in biomaterials, the carboxylic acid group was proven to act as a protonconducting group. This study investigated the influence of carboxylic acid concentration on both interfacial and internal proton transport. Several styrene-based polymers containing the carboxylic acid group were synthesized. The amount of carboxylic acid group in the polymer chain was varied to explore the effects of weak acid concentration on polymer thin films' electrical properties. The IR p-polarized multiple-angle incidence resolution spectrometry (pMAIR) spectra show the higher ratio of the free carboxylic acid groups rather than cyclic dimers in polymers with a higher concentration of carboxylic acid group, facilitating the more hydrogen bonding networks in films. The water uptake results reveal the similar number of adsorbed water molecules per carboxylic acid group in all thin films. Remarkably, polymer thin films with high carboxylic acid concentration provide internal proton conduction because of the relative increase in the amount of the free carboxylic acid group. In contrast, interfacial proton conduction was found in low carboxylic acid concentration polymers because of the relatively large amount of cyclic dimer carboxylic acid group and poor amount of free carboxylic acid group. This study provides insight into interfacial proton transport behavior according to the weak acid concentration, which might explain proton transport in biological systems.

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Solution blown biofunctionalized poly(vinylidene fluoride) nanofibers for application in proton exchange membrane fuel cells

Cited by 37 publications

References 37 publications

De Novo Ion-Exchange Membranes Based on Nanofibers

De Novo Ion-Exchange Membranes Based on Nanofibers

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

Interfacial and Internal Proton Conduction of Weak-acid Functionalized Styrene-based Copolymer with Various Carboxylic Acid Concentrations

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