Structure, properties and proton conductivity of nanocomposite membranes

Noto, Vito Di; Piga, Matteo; Lavina, Sandra; Negro, Enrico; Yoshida, Kenta; Ito, Ryosuke; Furukawa, T.

doi:10.1016/j.electacta.2009.06.011

Cited by 72 publications

(152 citation statements)

References 30 publications

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“…30 The fourth mass elimination, detected between 400-500 uC range, is due to the decomposition of the fluorocarbon chains of the polymer matrix. [22][23][24][28][29][30]35 The thermal stability of the PTFE chains in the presence of ZrTa is higher than in pristine Nafion. Above 600 uC, the mass residue is related to the amount of the inorganic moiety present in bulk membranes.…”

Section: Resultsmentioning

confidence: 99%

“…4 inset b) is associated with the thermal degradation of the polyether side chains. 23,24,[28][29][30]35 In contrast to the filler's stabilizing effect on the -SO 3 H groups, ZrTa tends to decrease the thermal stability of the polyether side groups likely due to the catalytic effect of the transition metal oxides. 30 The fourth mass elimination, detected between 400-500 uC range, is due to the decomposition of the fluorocarbon chains of the polymer matrix.…”

Section: Resultsmentioning

confidence: 99%

“…4 inset a, is associated with the degradation of -SO 3 H groups and is in agreement with previous studies. [28][29][30]35 The filler has a slight stabilizing effect on the -SO 3 H groups in the composite membranes as compared to pristine Nafion. The weight loss observed between 300 and 380 uC (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(M2 x O y ) z ] membranes show reduced water uptake and improved mechanical properties and proton conductivity as compared to pristine Nafion 1 and [Nafion/(M x O y ) n ] membranes. 28 This work aims to elucidate the effect of a nanofiller containing ZrO 2 and Ta 2 O 5 oxoclusters on Nafion's structure and thermal, mechanical and electrical properties. This report describes the synthesis and characterization of the new ''coreshell'' nanofiller and the preparation of Nafion-based nanocomposite membranes.…”

Section: Introductionmentioning

confidence: 99%

“…The new ZrO 2 and Ta 2 O 5 -containing nanofiller is prepared with the intent of combining the improvements resulting from fillers with a ''core-shell'' morphology with the intrinsic characteristics of the individual oxides that will allow it to maintain strong R- 3 -R interactions and reduce the water uptake within the hybrid membranes. Of the group IV and period VI oxoclusters previously investigated, [22][23][24]28 32 The preparation of the nanofiller based on ZrO 2 and Ta 2 O 5 , indicated as ZrTa, is part of an effort to produce a ''chemical core-shell'' nanofiller and subsequently elucidate the effect of its chemistry and surface properties on the structure, properties and fuel cell performance of the resulting hybrid inorganic-organic membranes. 30 In addition, the water uptake, the thermal and structural properties will be examined.…”

Section: Introductionmentioning

confidence: 99%

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New nanocomposite proton conducting membranes based on a core–shell nanofiller for low relative humidity fuel cells

et al. 2013

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New hybrid inorganic-organic proton conducting membranes containing a ZrTa nanofiller dispersed in a Nafion 1 matrix are described. The ZrTa nanofiller exhibits a ''core-shell'' morphology, where the harder ZrO 2 forms the ''core'', which is covered by a ''shell'' of the softer Ta electrode assembly (MEA) containing the hybrid membrane is better than that of the MEA containing Nafion, particularly at low values of relative humidity. The hybrid membranes require much less water to conduct protons effectively and are more efficient at retaining water than Nafion at low water activities.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New nanocomposite proton conducting membranes based on a core–shell nanofiller for low relative humidity fuel cells

et al. 2013

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Broadband Dielectric Spectroscopy: A Powerful Tool for the Determination of Charge Transfer Mechanisms in Ion Conductors

Noto

Giffin

Vezzù³

et al. 2012

Solid State Proton Conductors

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Ionically conducting materials (ICMs) are of great importance for the fabrication of portable batteries for electronic devices such as computers, tools, and video and still cameras, and for the development of fuel cell and battery-powered electric vehicles, dye-sensitized solar cells, supercapacitors, and sensors [1].It has been suggested that conductivity in ICMs occurs via a number of different processes. The predominant conductivity processes are attributed to: (a) the migration of ions between coordination sites in the host materials [2][3][4][5], and (b) the increase of conductivity due to relaxation phenomena involving the dynamics of the host materials [2][3][4][5]. Ions "hopping" to new chemical environments can lead to successful charge migration only if ion-occupying domains relax via reorganizational processes [2-5], which generally are coupled with relaxation events associated with the host matrix.In this chapter, the authors concisely describe the instruments used in the comprehensive study of the electric response of ionic conductors. To provide the reader with the basic tools necessary to understand broadband dielectric spectroscopy [6,7], the first part will review the general phenomena and basic theory behind each type of electric response that materials may exhibit when they are subjected to static or dynamic electric fields. This will be achieved by focusing on the practical use of equations, while referring the reader to specialized texts for detailed explanations of the equations. The second part of this chapter

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