Application of the Compensated Arrhenius Formalism to Self-Diffusion: Implications for Ionic Conductivity and Dielectric Relaxation

Petrowsky, Matt; Frech, Roger

doi:10.1021/jp1020142

Cited by 61 publications

(88 citation statements)

References 47 publications

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“…Changing the ionic liquid member or reference temperature has only a marginal effect on the value of the activation energy, which are trends previously observed for pure organic liquids and electrolytes. 1,4,6 The average activation energy for conductivity in the 1-alkyl-3-methylimidazolium triflate family is 49.9 ± 0.5 kJ/mol while that for fluidity is 43.5 ± 0.7 kJ/mol. These activation energies are substantially higher than those obtained for typical aprotic organic liquids and electrolytes.…”

Section: Resultsmentioning

confidence: 99%

“…A scaling procedure can be performed that accounts for the dielectric constant dependence and allows calculation of the activation energy for transport. 1,6,8,9 Here, the CAF is applied to mass and charge transport phenomena in 1-alkyl-3-methylimidazolium triflate ionic liquids, where the alkyl group is either butyl, hexyl, octyl, or decyl. These four ionic liquids are abbreviated here as bmimTf, hmimTf, omimTf, and dmimTf, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Mass and charge transport in 1-alkyl-3-methylimidazolium triflate ionic liquids

Petrowsky

Burba

Frech

2013

The Journal of Chemical Physics

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Temperature-dependent transport properties in ionic liquids, such as the ionic conductivity and fluidity, are often characterized empirically through equations that require multiple adjustable fitting parameters in order to adequately describe the data. These fitting parameters offer no insight into the molecular-level mechanism of transport. Here the temperature dependence of these transport properties in 1-alkyl-3-methylimidazolium triflate ionic liquids is explained using the compensated Arrhenius formalism (CAF), where the conductivity or fluidity assumes an Arrhenius-like form that also contains a dipole density dependence in the exponential prefactor. The resulting CAF activation energies for conductivity and fluidity are much higher than those obtained from polar organic liquids and electrolytes. The CAF very accurately describes the temperature dependence of both conductivity and fluidity using only system properties (i.e., density and activation energy). These results imply that the transport mechanism in molten salts is very similar to that in polar organic liquids and electrolytes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass and charge transport in 1-alkyl-3-methylimidazolium triflate ionic liquids

Petrowsky

Burba

Frech

2013

The Journal of Chemical Physics

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“…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: Acs Applied Materials and Interfacesmentioning

confidence: 99%

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

Gahlot¹,

Sharma²,

Kulshrestha³

et al. 2014

ACS Appl. Mater. Interfaces

181

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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“…The membranes conductivity found to be increased from 1.55 to 1.63 times for SCH to MGO-SCH-5 membrane on increasing the temperature from 30 to 90°C. The increment in proton conductivity at higher temperature may be due to the increment proton migration [30,31]. In case of MGO-SCH-5 membrane the conductivity is comparable with Nafion-117 membrane for whole temperature range [32].…”

Section: Effect Of Temperature On Ionic Conductivity Of Hybrid Membramentioning

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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Application of the Compensated Arrhenius Formalism to Self-Diffusion: Implications for Ionic Conductivity and Dielectric Relaxation

Cited by 61 publications

References 47 publications

Mass and charge transport in 1-alkyl-3-methylimidazolium triflate ionic liquids

Mass and charge transport in 1-alkyl-3-methylimidazolium triflate ionic liquids

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

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