PROTON CONDUCTING NANOCOMPOSITE MEMBRANES BASED ON SULFONATED POLY (ETHER ETHER KETONE) AND SULFONATED SILICA NANOPARTICLES FOR FUEL CELLS

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SALARIZADEH PARISA; JAVANBAKHT MEHRAN

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Seminar Paper

Paper Information

Seminar: IRANIAN CHEMISTRY CONGRESS
Year:2014 | Issue:17

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Title

PROTON CONDUCTING NANOCOMPOSITE MEMBRANES BASED ON SULFONATED POLY (ETHER ETHER KETONE) AND SULFONATED SILICA NANOPARTICLES FOR FUEL CELLS

Author(s)

SALARIZADEH PARISA | JAVANBAKHT MEHRAN | Issue Writer Certificate

Keywords

COMPOSITE MEMBRANES

SULFONATED POLYETHER ETHER KETONE

CONDUCTIVITY

SULFONATED SILICA NANOPARTICLES

Abstract

BACKGROUND: IN POLYMER ELECTROLYTE FUEL CELL OPERATION, A DECREASE IN THE PROTON CONDUCTIVITY OF THE MEMBRANE AT REDUCED HUMIDITY IS A MAIN CAUSE FOR POOR CELL PERFORMANCE AT HIGH TEMPERATURE. TO ALLEVIATE THE DEHYDRATION OF THE MEMBRANE AT HIGH TEMPERATURE, SULFONATED SILICA NANOPARTICLES (SSN) ARE EMBEDDED IN SULFONATED POLY (ETHER ETHER KETONE) (SPEEK) MEMBRANES. AS THE SSN ITSELF IS HIGHLY SULFONATED ON ORGANIC MOIETIES, THE PROTON CONDUCTIVITY OF NANOCOMPOSITE MEMBRANES IS MUCH HIGHER THAN THAT OF THE PRISTINE SPEEK MEMBRANE AND IT REACHES THAT OF NAFION 117 AT A HIGH RELATIVE HUMIDITY (RH) OF 90%. THE PROTON CONDUCTIVITY OF THE COMPOSITE MEMBRANES IS MUCH HIGHER THAN THAT OF PRISTINE SPEEK MEMBRANE (S=5×10-2SCM-1)METHODS: POLY (2-ACRYLAMIDO-2-METHYL-1-PROPANE SULFONIC ACID)-GRAFTED SILICA NANOPARTICLES (PAMPS-G-SN) WITH AN AVERAGE DIAMETSER SMALLER THAN 70 NM WERE SYNTHESIZED VIA SURFACE-INITIATED FREE-RADICAL POLYMERIZATION OF THE AMPS FROM SURFACE OF THE AMINOPROPYL-FUNCTIONALIZED SILICA NANOPARTICLES [1]. SULFONATED POLYETHER ETHER KETONE WAS OBTAINED BY DISSOLVING PEEK IN H2SO4 (10 WT %), AT 60OC, UNDER STIRRING, FOR 6 HOURS, TILL THE OBTAINING OF A DARK ORANGE-RED SPEEK SOLUTION. THEN, THE SOLUTION WAS DROPPED INTO DI WATER SLOWLY, AND THEN THE PRECIPITATES WERE FILTERED AND WASHED WITH DI WATER SEVERAL TIMES AND DRIED AT 80OC FOR 24 H. MEMBRANES CONTAINING DIFFERENT AMOUNTS OF PAMPS-G-SN IN SPEEK WERE CAST FROM DMAC TOGETHER WITH A PURE SPEEK REFERENCE MEMBRANE. THE SAMPLES WERE ACTIVATED IN 5 M H2SO4 AT ROOM TEMPERATURE, THEN RINSED WITH DEIONIZED WATER AND DRIED.RESULT: THE DEGREE OF SULFONATION (DS) WAS EVALUATED BY TITRATION METHOD, ACCORDING TO PUBLISHED PROCEDURES [2]. DS OF SPEEK WAS OBTAINED 80%. PROTON CONDUCTIVITY OF MEMBRANES CONTAINING DIFFERENT NANOPARTICLES WAS MEASURED AT ROOM TEMPERATURE AS A FUNCTION OF NANOPARTICLES CONTENT. CONDUCTIVITY VALUES IN THE MEMBRANES INCREASED WITH INCREASING OF SULFONATED NANOPARTICLES. THIS BEHAVIOR CAN BE ATTRIBUTED TO THE PRESENCE OF PROTON CONDUCTIVE SO3H GROUPS IN MEMBRANES PREPARED WITH SULFONATED SILICA.CONCLUSION: HIGHLY HOMOGENEOUS HYBRID MEMBRANES BASED ON SPEEK WITH A HIGH DEGREE OF SULFONATION (DS=0.8) AND VARIOUS AMOUNTS OF NANOPARTICLES WERE PREPARED BY SOLVENT CASTING METHOD. WATER UPTAKE AND PROTON CONDUCTIVITY OF THE NANOCOMPOSITES WERE INCREASED SIGNIFICANTLY BY INCREASING THE SULFONATED NANOPARTICLES.

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APA: Copy

SALARIZADEH, PARISA, & JAVANBAKHT, MEHRAN. (2014). PROTON CONDUCTING NANOCOMPOSITE MEMBRANES BASED ON SULFONATED POLY (ETHER ETHER KETONE) AND SULFONATED SILICA NANOPARTICLES FOR FUEL CELLS. IRANIAN CHEMISTRY CONGRESS. SID. https://sid.ir/paper/912026/en

Vancouver: Copy

SALARIZADEH PARISA, JAVANBAKHT MEHRAN. PROTON CONDUCTING NANOCOMPOSITE MEMBRANES BASED ON SULFONATED POLY (ETHER ETHER KETONE) AND SULFONATED SILICA NANOPARTICLES FOR FUEL CELLS. 2014. Available from: https://sid.ir/paper/912026/en

IEEE: Copy

PARISA SALARIZADEH, and MEHRAN JAVANBAKHT, “PROTON CONDUCTING NANOCOMPOSITE MEMBRANES BASED ON SULFONATED POLY (ETHER ETHER KETONE) AND SULFONATED SILICA NANOPARTICLES FOR FUEL CELLS,” presented at the IRANIAN CHEMISTRY CONGRESS. 2014, [Online]. Available: https://sid.ir/paper/912026/en

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