Constructing anhydrous proton exchange membranes through alternate depositing graphene oxide and chitosan on sulfonated poly(vinylidenefluoride) or sulfonated poly(vinylidene fluoride-co-hexafluoropropylene) membranes

Shen, Shyh‐Chiang; Jia, Tingting; Jia, Jing; Wang, Ning; Song, Di; Zhao, Jing; Jin, Jin; Che, Quantong

doi:10.1016/j.eurpolymj.2020.110160

Cited by 28 publications

(10 citation statements)

References 58 publications

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“…But it has been noted that when this temperature is exceeded, the number of proton transport carriers decreases due to water evaporation. A similar situation was observed in poly(acrylic acid) and benzimidazole deposited SPEEK membranes [53] and SPVDF (CS/SiO 2 )/PA and SPVDF (bmimCl/SPEEK)/PA membranes [54]. As a result of this study, the best proton conductivity of the membranes obtained can be recommended for 90 °C.…”

Section: Resultssupporting

confidence: 84%

Improving proton conductivity of poly(oxyphenylene benzimidazole) membranes with sulfonation and magnetite addition

Özaytekin

2021

Iran Polym J

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Flexible membranes of poly(oxyphenylene benzimidazole) (PBIO) polymer with oxygen in the main chain were prepared. Proton conductivity was improved by sulfonation and adding magnetite to the PBIO membrane. A hydrophilic PBIO polymer/ polyvinylidene difluoride (PVDF) mixture was used to prepare the membrane. DMF/acetone solvent pair was used to obtain homogeneous solutions of these two polymers. By modifying the PBIO with sulfuric acid, the PBIO membrane and PBIOsm composite membrane were obtained through sulfuric acid modification as well as the addition of magnetite. The structures of the obtained cast PBIO membranes were illuminated by FTIR, TGA, SEM, and EDX analyses. According to XRD analysis, the crystallization percentages of PBIO, PBIOs, and PBIOsm were compared and a synergistic effect of the degree of crystallization on the ability of the ion exchange was observed. The highest degree of crystallinity was determined at 79% for PBIOsm. Upon the addition of magnetite, the water-holding capacity and proton conductivity of the PBIO membranes increased. The proton conductivity values were measured at 90, 120, and 140 °C. The proton conductivity was found to be higher in the sulfonated PBIOs and sulfonated-magnetite doped membranes. The highest proton conductivity of 36.78 mS/ cm was obtained from the combination of sulfuric acid and PBIOsm composite membrane. The proton conductivity of the PBIO membrane was measured to be 36.61 mS/cm.

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Section: Resultssupporting

confidence: 84%

Improving proton conductivity of poly(oxyphenylene benzimidazole) membranes with sulfonation and magnetite addition

Özaytekin

2021

Iran Polym J

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“…Increasing environmental pollution and depleting natural resources have emphasized the need for clean and sustainable energy [ 1 , 2 , 3 , 4 , 5 ]. One of the most effective methods for this purpose is the conversion of chemical energy into electrical energy [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of a Novel Sulfonated Titanium Oxide Incorporated Chitosan Nanocomposite Membranes for Fuel Cell Application

et al. 2021

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In this study, nano-TiO2 sulfonated with 1,3-propane sultone (STiO2) was incorporated into the chitosan (CS) matrix for the preparation of CS/STiO2 nanocomposite membranes for fuel cell applications. The grafting of sulfonic acid (–SO3H) groups was confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis and energy-dispersive X-ray spectroscopy. The physicochemical properties of these prepared membranes, such as water uptake, swelling ratio, thermal and mechanical stability, ion exchange capacity and proton conductivity, were determined. The proton conducting groups on the surface of nano-TiO2 can form continuous proton conducting pathways along the CS/STiO2 interface and thus improve the proton conductivity of CS/STiO2 nanocomposite membranes. The CS/STiO2 nanocomposite membrane with 5 wt% of sulfonated TiO2 showed a proton conductivity (0.035 S·cm−1) equal to that of commercial Nafion 117 membrane (0.033 S·cm−1). The thermal and mechanical stability of the nanocomposite membranes were improved because the interfacial interaction between the -SO3H group of TiO2 and the –NH2 group of CS can restrict the mobility of CS chains to enhance the thermal and mechanical stability of the nanocomposite membranes. These CS/STiO2 nanocomposite membranes have promising applications in proton exchange membrane fuel cells.

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“…On the other hand, the SSiO 2 @CNTs fillers are fine dispersion in the CS matrix, this is conducive to the formation of abundant physics crosslinking points in CS, thereby the mobility of CS chains would be further interfered and leads to increase of tensile strength. [36,42] The decreasing of tensile strength with increasing of SSiO 2 @CNTs content from 7 to 10 wt% is mainly due to the aggregation, which results in poor dispersion and decreased interface interaction. The enhanced mechanical properties imply promising application potential in proton exchange membranes fuel cells.…”

Section: Thermal Stability and Mechanical Propertymentioning

confidence: 99%

The Construction and Application of Dual‐Modified Carbon Nanotubes in Proton Exchange Membranes with Enhanced Performances

Feng

Zhong

et al. 2021

Macro Materials & Eng

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In this study, the carbon nanotubes (CNTs) are successively coated via sol-gel method with SiO 2 (SiO 2 @CNTs), followed by grafting with 3-merraptnpropyltrimethnxysilane and oxidation with hydrogen peroxide to yield dual-modified CNTs (SSiO 2 @CNTs). The SSiO 2 @CNTs material is applied to prepared chitosan (CS) based composite proton exchange membranes by the incorporation of various content of SSiO 2 @CNTs, the structure and properties of as-prepared composite membranes are fully investigated. Compared to pristine CS membrane, the SSiO 2 @CNTs-filled composite membranes show improved thermal stability, mechanical stability, and methanol resistance, owing to the effective interface interaction and good compatibility between SSiO 2 @CNTs and CS matrix. Additionally, the doping of SSiO 2 @CNTs also generates a positive effect on the electrochemistry performance, due to the construction of abundant transport channel and providing more proton sources or proton sites. Particularly, the CS/SSiO 2 @CNTs-7 membrane exhibits tensile strength of about 40.1 MPa and proton conductivity of 35.8 mS cm −1 at 80 °C, which is almost 1.6 and 2.0 times higher than pure CS membrane, and lower methanol permeability of 0.9 × 10 −6 cm 2 s −1 . The direct methanol fuel cell performance (DMFC) of CS/SSiO 2 @CNTs-7 membrane is also improved with open circuit voltage of 0.67 V and maximum power density of 60.7 mW cm −2 at 70 °C.

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Constructing anhydrous proton exchange membranes through alternate depositing graphene oxide and chitosan on sulfonated poly(vinylidenefluoride) or sulfonated poly(vinylidene fluoride-co-hexafluoropropylene) membranes

Cited by 28 publications

References 58 publications

Improving proton conductivity of poly(oxyphenylene benzimidazole) membranes with sulfonation and magnetite addition

Improving proton conductivity of poly(oxyphenylene benzimidazole) membranes with sulfonation and magnetite addition

Preparation and Characterization of a Novel Sulfonated Titanium Oxide Incorporated Chitosan Nanocomposite Membranes for Fuel Cell Application

The Construction and Application of Dual‐Modified Carbon Nanotubes in Proton Exchange Membranes with Enhanced Performances

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