Water self-diffusion anisotropy and electrical conductivity of perfluorosulfonic acid/SiO2 composite proton exchange membranes

Filipoi, Carmen; Demco, Dan E.; Zhu, Xiaomin; Vinokur, Rostislav; Conradi, Oliver; Fechete, Radu; Möller, Martin

doi:10.1016/j.cplett.2012.10.031

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…The 86% increment in conductivity is due to the higher IEC, higher water retention capacity, higher λ value, and the higher number of available sulfonic group sites in the membrane. High IEC provides adequate acidic groups inside the membrane and a high water uptake makes the proton diffusion easy. , Acidic functional groups (−SO 3 H) of polyelectrolyte membranes dissociate because of hydration and allow transport of hydrated proton (H 3 O) + . Temperature also plays an important role in proton conductivity.…”

Section: Resultsmentioning

confidence: 99%

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SGO/SPES-Based Highly Conducting Polymer Electrolyte Membranes for Fuel Cell Application

Gahlot¹,

Sharma²,

Kulshrestha³

et al. 2014

ACS Appl. Mater. Interfaces

184

114

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Proton-exchange membranes (PEMs) consisting of sulfonated poly(ether sulfone) (SPES) with enhanced electrochemical properties have been successfully prepared by incorporating different amount of sulfonated graphene oxide (SGO). Composite membranes are tested for proton conductivity (30-90 °C) and methanol crossover resistance to expose their potential for direct methanol fuel cell (DMFC) application. Incorporation of SGO considerably increases the ion-exchange capacity (IEC), water retention and proton conductivity and reduces the methanol permeability. Membranes have been characterized by FTIR, XRD, DSC, SEM, TEM, and AFM techniques. Intermolecular interactions between the components in composite membranes are established by FTIR. The distribution of SGO throughout the membrane matrix has been examined using SEM and TEM and found to be uniform. The maximum proton conductivity has been found in 5% SGO composite with higher methanol crossover resistance.

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Section: Resultsmentioning

confidence: 99%

“…High IEC provides adequate acidic groups inside the membrane and a high water uptake makes the proton diffusion easy. 38,39 Acidic functional groups (−SO 3 H) of polyelectrolyte membranes dissociate because of hydration and allow transport of hydrated proton (H 3 O) + . Temperature also plays an important role in proton conductivity.…”

Section: Iec Wet Dry Drymentioning

confidence: 99%

SGO/SPES-Based Highly Conducting Polymer Electrolyte Membranes for Fuel Cell Application

Gahlot¹,

Sharma²,

Kulshrestha³

et al. 2014

ACS Appl. Mater. Interfaces

184

114

View full text Add to dashboard Cite

show abstract

“…The membrane conductivity was found to be increased from 1.55 to 1.63 times for SCH to MGO-SCH-5 membrane upon increasing the temperature from 30 to 90 C. The increment in proton conductivity at higher temperatures may be due to the increment in proton migration. 30,31 In the case of the MGO-SCH-5 membrane, the conductivity is comparable with a Naon-117 membrane over the whole temperature range. 32 Methanol permeation (P m ) of hybrid membranes…”

Section: Effect Of Temperature On Ionic Conductivity Of Hybrid Membranesmentioning

confidence: 93%

Synthesis of highly stable and high water retentive functionalized biopolymer-graphene oxide modified cation exchange membranes

Sharma

Kulshrestha

2015

RSC Adv.

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Utility of Polymer electrolyte membrane in energy based devices is substituting the conventional electrolyte. Herein, we have synthesized PEM based biopolymer, functionalized silica modified GO and PVA. GO is modified in two steps to synthesize silica grafted sulfonated GO.Functionalization of chitosan is done using 1,3 propane sultone after deacetylation. Further, PVA has been used as a polymer matrix since PVA possess good film forming property with mechanical stability. Different weight % (1, 2 and 5) of modified GO has been incorporated in the chitosan matrix. Prepared PEMs are subjected to different characterization such as structural, thermal, mechanical and electrochemical etc. The nano-hybrid membranes shows the significant increment in electrochemical properties. MGO-SCH-5 membrane shows the proton conductivity as 6.77 ×10 −2 S cm -1 which goes to increases upto 11.2×10 −2 S cm -1 at 90 0 C. Thermal and mechanical stability of PEM also gets increases with the MGO content in to sulfonated chitosan.The elastic modulus for MGO-SCH-5 membrane is calculated to 21.37 MPa with 54 MPa of maximum stress. Thus membranes may be targeted as PEM for higher temperature energy application. IntroductionPolymer electrolyte membranes (PEM) are playing a vital role in energy based devices, and replacing liquid electrolyte in fuel cells and batteries due to their ease of handling and excellent physico-chemical as well as mechanical properties etc. [1][2][3][4]. Composite membranes are the subject of intense research as well as are ideal work of art due to its excellent properties [5][6]. To date, various kind of fillers have been incorporated into polymer matrix to enhance the membrane performance for different applications [7][8][9][10]. Different type carbon based materials such as carbon quantum dots, graphene oxide, C 60 and carbon nanotube have been incorporated within the polymeric membranes and they have displayed significant enhancement in the membrane performance. Different types of oxides and conducting polymers have also been incorporated into the PEM to enhance its applicability and stability [11][12]. An ideal PEM must have high ionic conductivity, high thermal, mechanical stability and high methanol crossover resistance to be employed as solid electrolyte for fuel cell application. Fascinating properties of Graphene oxide (GO) makes it a material of interest and in past few years research on GO is rising and it can be estimated by the increasing number of publications [6]. Applicability of GO has been realized for many applications and many other are yet to be explored [13]. Use of GO in polymer electrolyte membrane has been done in our previous work [7]. Further, GO has also been modified with different metals, metal oxides etc. by many researchers [8]. Modification of GO with silica is an effective strategy to increase the stability of material, since silica is a low cost and abundant material. GO-silica composite has been prepared by Zhang et. Al. for electroreponsive characteristics [9]. High ionic conduct...

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Hydrated proton self-diffusion study in ion-exchange membranes by MRI and impedance spectroscopy

2017

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Water self-diffusion anisotropy and electrical conductivity of perfluorosulfonic acid/SiO2 composite proton exchange membranes

Cited by 10 publications

References 28 publications

SGO/SPES-Based Highly Conducting Polymer Electrolyte Membranes for Fuel Cell Application

SGO/SPES-Based Highly Conducting Polymer Electrolyte Membranes for Fuel Cell Application

Synthesis of highly stable and high water retentive functionalized biopolymer-graphene oxide modified cation exchange membranes

Hydrated proton self-diffusion study in ion-exchange membranes by MRI and impedance spectroscopy

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