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Studies on Proton Conductors Working at High Temperatures and Low Humidity

Author: WangDong
Tutor: HeRongHuan
School: Northeastern University
Course: Physical and chemical
Keywords: Proton exchange membrane Proton conductor Conductivity Mechanical behavior DC four - electrode method
CLC: TM911.4
Type: Master's thesis
Year: 2008
Downloads: 38
Quote: 0
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Abstract


The proton exchange membrane (PEM) is the core component of the proton exchange membrane fuel cell (PEMFC) . The PEM performance directly determines the the PEMFC health . In PEMFC commonly used PEM perfluorosulfonic acid , the most widely used Nafion membrane , for example, the proton conduction due to water-dependent , its operating temperature of 80 ° C . Such relatively low temperature will bring such as : low conductivity water and heat management problems , the CO poisoning of Pt . Development PEM used under high temperature conditions can solve the above problems , therefore, research and development of the PEM of the high - temperature non-hydrated in hot areas of research PEMFC . This study to the pure phosphoric acid - doped imidazole and pyridine in the conductivity of the two different systems is discussed separately , in order to be able to be used in high temperature, low humidity conditions , the proton conductors having a high proton conductivity system . In pure phosphoric acid were added imidazole and pyridine to form a mixed system , under anhydrous conditions , the conductivity of the mixed system of the conductivity of pure phosphoric acid is low . Dioxide tin ( SnO2 ) , indium oxide (In2O3) and 85% phosphoric acid was synthesized SnP2O7 and SnInP2O7 by a solution casting method , the SnP2O7 respectively and sulfonated polyetheretherketone (SPEEK) and poly vinylidene fluoride ( PVDF) composite film. Study the SnP2O7 its composite membranes SnP2O7/SPEEK , with SnP2O7/PVDF conductivity and room temperature under anhydrous conditions at 100-300 ℃ and 130 ℃ mechanical properties . At 200 ° C without humidification conditions , SnP2O7 maximum the conductivity of 0.058S/cm ; , the mechanical performance of SnP2O7/PVDF to superior SnP2O7/SPEEK the mechanical properties under the same conditions as temperature and SnP2O7 content . At 130 ℃ When of SnP2O7 the mass fraction is 40% , the maximum tensile strength of the composite membrane SnP2O7/PVDF 14.95MPa, while the maximum tensile strength of the composite membrane SnP2O7/SPEEK (SD = 51%) compared to 6.36 MPa. The same time, the study tested SnP2O7 content and temperature on the tensile strength of the composite the film SnP2O7/SPEEK SnP2O7/PVDF .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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