SPVdF-HFP/SGO nanohybrid proton exchange membrane for the applications of direct methanol fuel cells

Ranganathan, Hariprasad; Vinothkannan, Mohanraj; Kim, Ae Rhan; Yoo, Dong Jin

doi:10.1080/01932691.2019.1660672

Cited by 49 publications

(33 citation statements)

References 49 publications

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“…The evolution in the layer structure and microstructure of layers with varying the number of layers or layer thicknesses was investigated. By combining a high dielectric constant polymer of PVDF-HFP with super electrochemical properties [22][23][24], and a linear dielectric polymer of PC with low dielectric loss and high breakdown strength, dielectric properties of the obtained films were further investigated. The relationship between the multiscale structure and the final dielectric properties was thus established, and the corresponding mechanisms was elucidated.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Structural Evolution and Its Relationship to Dielectric Properties of Micro-/Nano-Layer Coextruded PVDF-HFP/PC Films

et al. 2020

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An understanding of the structural evolution in micro-/nano-layer co-extrusion process is essential to fabricate high-performance multilayered products. Therefore, in this work, we reveal systematically the multiscale structural development, involving both the layer architecture and microstructure within layers of micro-/nano-layer coextruded polymer films, as well as its relationship to dielectric properties, based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/polycarbonate (PC) system. Interestingly, layer architecture and morphology show strong dependences on the nominal layer thicknesses. Particularly, with layer thickness reduced to nanometer scale, interfacial instabilities triggered by viscoelastic differences between components emerge with the creation of micro-droplets and micro-sheets. Films show an enhanced crystallization with the formation of two-dimensional (2D) spherulites in microlayer coextruded systems and the oriented in-plane lamellae in nanolayer coextruded counterparts, where layer breakup in the thinner layers further changes the crystallization behaviors. These macro- and microscopic structures, developed from the co-extrusion process, substantially influence the dielectric properties of coextruded films. Mechanism responsible for dielectric performance is further proposed by considering these effects of multiscale structure on the dipole switching and charge hopping in the multilayered structures. This work clearly demonstrates how the multiscale structural evolution during the micro-/nano-layer coextrusion process can control the dielectric properties of multilayered products.

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Section: Introductionmentioning

confidence: 99%

Multiscale Structural Evolution and Its Relationship to Dielectric Properties of Micro-/Nano-Layer Coextruded PVDF-HFP/PC Films

et al. 2020

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“…In Figure 7, for each sample, plane and three-dimensional views of the surface were presented. The surface roughness (Ra) of the films is summarized in Table 3 [38][39][40][41]. As shown in Figure 7, the DBD treatment increases the surface roughness of the polymer film, especially in the film treated at 10 kV for 15 s. The surface roughness of untreated film is approximately 22.4 nm, and increases to 87.7 nm after the film is treated at 10 kV for 15 s. Further treatment at 10 kV for 60 s seems to smooth over the surface and the roughness is reduced.…”

Section: Resultsmentioning

confidence: 99%

Effect of Dielectric Barrier Discharge (DBD) Treatment on the Dielectric Properties of Poly(vinylidene fluoride)(PVDF)-Based Copolymer

Liu

Zhou

et al. 2020

Polymers

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Understanding the mechanism of dielectric breakdown is important for improving the breakdown field of a polymer. In this work, dielectric barrier discharge (DBD) treatment was applied to one surface of P(VDF-CTFE) (vinylidene fluoride-chlorotrifluoroethylene) film, and the dielectric properties of the film were studied. When the treated surface was connected to the high potential side of the power source for the breakdown test, the breakdown field of the treated film was significantly reduced compared to that of the pristine film. Based on the characterization results for the surface chemistry and morphology, it was proposed that the phenomenon was caused by the combined effects of hole injection from the metal electrode and the damage of polymer chains near the surface of the polymer film after the DBD treatment process.

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“…According to our previous work [ 30 ], the solid polymer electrolyte exhibits the best electrochemical properties when the mass ratio of Zn(Tf) 2 to PVdF-HFP is 0.4, and this composition was chosen as the host system for the preparation of ionic liquid-incorporated Zn-ion polymer electrolyte (ILPE) membranes. Moreover, ILPE membranes with different contents of ionic liquid (the mass ratio of EMITf to PVdF-HFP being 0, 0.1, 0.2, 0.3, 0.4, and 0.5, marked as SPE-Zn, ILPE-Zn-1, ILPE-Zn-2, ILPE-Zn-3, ILPE-Zn-4, and ILPE-Zn-5, respectively) were prepared via a solution cast method.…”

Section: Methodsmentioning

confidence: 99%

“…PVdF-HFP consists of both amorphous and crystalline structures. The amorphous region is beneficial to ion transport, while the crystalline structure provides a better mechanical property [ 28 , 29 , 30 ]. Furthermore, PVdF-HFP exhibits sound chemical and thermal stabilities due to its strong C-F bonds [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Incorporated Zn-Ion Conducting Polymer Electrolyte Membranes

et al. 2020

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In this study, novel ionic liquid-incorporated Zn-ion conducting polymer electrolyte membranes containing polymer matrix poly (vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf), along with zinc trifluoromethanesulfonate Zn(Tf)2, are prepared and investigated. It is ascertained that the optimal membrane ILPE-Zn-4 (the mass ratio of EMITf:Zn(Tf)2:PVDF-HFP is 0.4:0.4:1), with abundant nanopores, exhibits a high amorphousness. At room temperature, the optimized electrolyte membrane offers a good value of ionic conductivity (~1.44 × 10−4 S cm−1), with a wide electrochemical stability window (~4.14 V). Moreover, the electrolyte membrane can sustain a high thermal decomposition temperature (~305 °C), and thus its mechanical performance is sufficient for practical applications. Accordingly, the ionic liquid-incorporated Zn-ion conducting polymer electrolyte could be a potential candidate for Zn-based energy storage applications.

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SPVdF-HFP/SGO nanohybrid proton exchange membrane for the applications of direct methanol fuel cells

Cited by 49 publications

References 49 publications

Multiscale Structural Evolution and Its Relationship to Dielectric Properties of Micro-/Nano-Layer Coextruded PVDF-HFP/PC Films

Multiscale Structural Evolution and Its Relationship to Dielectric Properties of Micro-/Nano-Layer Coextruded PVDF-HFP/PC Films

Effect of Dielectric Barrier Discharge (DBD) Treatment on the Dielectric Properties of Poly(vinylidene fluoride)(PVDF)-Based Copolymer

Ionic Liquid-Incorporated Zn-Ion Conducting Polymer Electrolyte Membranes

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