Effect of Solid Acidity of Zeolite on the Ion Conductivity of Zeolite-HSBR Composite Membrane

Takami, Masayoshi; Yamazaki, Yohtaro; Hamada, Hideaki

doi:10.5796/electrochemistry.69.98

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…The most common application is for ion-exchange in laundry detergents . Other applications under development that require either facilitating or inhibiting ion-exchange or ion transport include the uptake heavy metal ions , or radionucleotides for environmental remediation, coatings for corrosion resistance, , additives to proton transport membranes for fuel cells, − and their use as templates for electrochemical deposition of the smallest of nanowires . The use of these microporous frameworks in nanowire synthesis is driven by the possibility of fabricating high efficiency thermoelectric devices.…”

Section: Introductionmentioning

confidence: 99%

Ion Transport in the Microporous Titanosilicate ETS-10

Wei

Hillhouse

2006

J. Phys. Chem. B

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Impedance spectroscopy was used to investigate ion transport in the microporous crystalline framework titanosilicate ETS-10 in the frequency range from 1 Hz to 10 MHz. These data were compared to measured data from the microporous aluminosilicate zeolite X. Na-ETS-10 was found to have a lower activation energy for ion conduction than that of NaX, 58.5 kJ/mol compared to 66.8 kJ/mol. However, the dc conductivity and ion hopping rate for Na-ETS-10 were also lower than NaX. This was found to be due to the smaller entropy contribution in Na-ETS-10 because of its high cation site occupancy. This was verified by ion exchanging Na(+) with Cu(2+) in both microporous frameworks. This exchange decreases the cation site occupancy and reduces correlation effects. The exchanged Cu-ETS-10 was found to have both lower activation energy and higher ionic conductivity than CuX. Zeolite X has the highest ion conductivity among the zeolites, and thus the data shown here indicate that ETS-10 has more facile transport of higher valence cations which may be important for ion-exchange, environmental remediation of radionucleotides, and nanofabrication.

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Section: Introductionmentioning

confidence: 99%

Ion Transport in the Microporous Titanosilicate ETS-10

Wei

Hillhouse

2006

J. Phys. Chem. B

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“…In the case of proton-exchanged zeolites/ HSBR membranes, the order in conductivity at 25 C was H-MOR (Si/Al ¼ 9) > H-MFI (11.5) > H-FAU[Y] (3). 7 Thus, the order in conductivity may change by the kind of cation in zeolite.…”

Section: Electrical Conductivity Of Zeolite/ptfe Composite Membranementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Recently, a few groups 7,8 have independently reported the preparation process of zeolite and polymer composite membranes. Takami et al 7 have reported the conductivity of composite membranes of zeolites and hydrated stylene butadiene rubber (HSBR). A calcium ion-exchanged Y-type zeolite/ HSBR exhibited the highest conductivity of 6 Â 10 À5 S cm À1 at 25 C among the composite membranes synthesized.…”

Section: Introductionmentioning

confidence: 99%

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Conductivity of zeolite/poly(tetrafluoroethylene) composite membrane in the presence of water vapor

Yahiro

Konda

Okada

2002

Phys. Chem. Chem. Phys.

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Zeolites and Molecular Sieves in Fuel Cell Applications

Yeung

Han

2010

Zeolites and Catalysis

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IntroductionZeolites and molecular sieves belong to an important class of natural and synthetic porous materials [1] that find important applications in many industrial processes including chemical separation and purification, chemical synthesis and fuel conversion, and pollution treatment and abatement [2][3][4]. The discovery of MCM-41 in 1992 [5, 6] has attracted research in the synthesis and applications of large pore molecular sieves including ordered mesoporous materials. The mesoporous materials display a greater range of pore sizes and compositions than typical zeolites and molecular sieves, and researches show that they are excellent catalyst, adsorbent, and membrane materials that have potential applications not only in traditional chemical processes but also in microelectronics, sensors, and agriculture [7-10].Fuel cell promises clean and efficient energy generation for stationary, mobile, and portable applications [11]. Striving for enhanced performance, zeolites and mesoporous materials are increasingly used in fuel cells. They were used to increase proton transport, decrease fuel crossover, and improve water management in the electrolyte membrane. They serve as electrode and electrocatalyst in the fuel cell and are also employed in fuel conversion, reforming, and storage. There are a number of excellent reviews on fuel cell electrolyte membranes [12][13][14][15][16][17] and electrode materials [18,19] in the literature, but none includes the recent uses of zeolites and molecular sieves. This chapter reviews the contributions of zeolites and molecular sieves in fuel cell research and is divided into three sections: (i) zeolites in electrolyte membrane, (ii) zeolites in fuel cell electrocatalysis, and (iii) zeolites in fuel processing for fuel cells. Zeolites in Electrolyte MembraneThe electrolyte membrane in a fuel cell separates the anode and cathode reactants and mediates the electrochemical reactions at the electrodes by rapid and selective

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Effect of Solid Acidity of Zeolite on the Ion Conductivity of Zeolite-HSBR Composite Membrane

Cited by 11 publications

References 30 publications

Ion Transport in the Microporous Titanosilicate ETS-10

Ion Transport in the Microporous Titanosilicate ETS-10

Conductivity of zeolite/poly(tetrafluoroethylene) composite membrane in the presence of water vapor

Zeolites and Molecular Sieves in Fuel Cell Applications

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