NANOCOMPOSITE NAFION/POLYVINYL ALCOHOL MEMBRANES FOR THE PEM FUEL CELL

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Hooshyari Khadijeh; JAVANBAKHT MEHRAN

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

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Title

NANOCOMPOSITE NAFION/POLYVINYL ALCOHOL MEMBRANES FOR THE PEM FUEL CELL

Author(s)

Hooshyari Khadijeh | JAVANBAKHT MEHRAN

Keywords

PEM FUEL CELL

PVA (POLY VINYL ALCOHOL)

NAFION

NANOCOMPOSITE MEMBRANES

PROTON CONDUCTIVITY

Abstract

BACKGROUND: PROTON EXCHANGE MEMBRANE (PEM) FUEL CELLS DISPLAY THE HIGHEST POWER DENSITIES COMPARED TO THE OTHER TYPE OF FUEL CELL [1]. PREPARATION OF PROTON EXCHANGE MEMBRANES (PEM) WITH LOW-PRICED AND HIGH PROTON CONDUCTIVITY TO REPLACE COMMERCIAL NAFION MEMBRANE HAS BEEN THE CHALLENGE OF CONTINUOUS RESEARCHES. POLY (VINYL ALCOHOL) (PVA) FILMS HAVE GOOD CHEMICAL AND MECHANICAL STABILITY AND HIGH POTENTIAL FOR CHEMICAL CROSS-LINKING. LOW PROTON CONDUCTIVITY AND HIGH SWELLING (EVEN DISSOLUBLE IN WATER AT HIGHER TEMPERATURE) OF PVA MEMBRANE LIMIT ITS APPLICATION IN PEM FUEL CELLS. ACCORDING TO A NEW RESEARCH REPORT, ADDITION OF HYGROSCOPIC METAL OXIDE NANOPARTICLES SUCH AS TITANIUM OXIDE, ZIRCONIUM OXIDE AND ZEOLITE IN A PVA POLYMER MATRIX IMPROVES ITS WATER UPTAKE AND PROTON CONDUCTIVITY [2]. ONE OF THE EFFECTIVE APPROACHES IS TO BLEND PVA WITH HYDROPHILIC POLYMER SUCH AS NAFION, SPEEK, POLY (STYRENE SULFONIC ACID-CO-MALEIC ACID) (PSSA-MA), WHICH RESULTING ENHANCE OF THE PROTON CONDUCTIVITY.METHODS: PVA/NAFION MIXTURE SOLUTION WITH PVA/NAFION WT RATIOS OF 7.3 WAS PREPARED BY MIXING PVA AQUEOUS SOLUTION WITH THE COMMERCIALLY SUPPLIED 5.0 WT% NAFION SOLUTION. SRCEO3 NANOAPRTICLES (2%.WT) WERE ADDED INTO PREPARED BLEND AS HYGROSCOPIC METAL OXIDE. TO ENHANCE THE MECHANICAL STRENGTH, GLUTARALDEHYDE WAS ADDED IN PREPARED SOLUTION AS CROSSLINKING AGENT. THE MIXTURE SOLUTION WAS CASTED IN A PETRI DISH FOR 24 H TO EVAPORATE THE SOLVENTS.RESULTS: THE PVA/NAFION NANOCOMPOSITE MEMBRANES DISPLAYED HIGHER PROTON CONDUCTIVITY (6.01×10-2 S CM-1) THAN THAT OF PVA (5.01×10-4 S CM-1) BASED MEMBRANES. THIS IMPROVEMENT IN THE PROTON CONDUCTIVITY OF PVA/NAFION NANOCOMPOSITE MEMBRANES WERE ATTRIBUTED TO THE EXCELLENT PROTON TRANSFER MECHANISM IN THE SRCEO3 NANOPARTICLES STRUCTURE AND NAFION IONIC CLUSTERS, WHICH INCREASES PROTON TRANSFER PATHWAYS. PROTON CONDUCTION IN PEROVSKITE STRUCTURE OF SRCEO3, RESULTING FROM ITS ABILITY TO DISSOLVE PROTONS FROM WATER OR HYDROGEN WHICH INCREASES PROTON TRANSFER IN HYDROLYZED IONIC SITE (SO3- H3O+) OF NAFION IN THE PVA/NAFION NANOCOMPOSITE MEMBRANES.CONCLUSION: OXYGEN VACANCIES PLAY A CRUCIAL ROLE IN PEROVSKITE STRUCTURE OF SRCEO3 FOR A PROTON TRANSFER IN PVA/NAFION NANOCOMPOSITE MEMBRANES.

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Cite

APA: Copy

Hooshyari, Khadijeh, & JAVANBAKHT, MEHRAN. (2014). NANOCOMPOSITE NAFION/POLYVINYL ALCOHOL MEMBRANES FOR THE PEM FUEL CELL. IRANIAN CHEMISTRY CONGRESS. SID. https://sid.ir/paper/912287/en

Vancouver: Copy

Hooshyari Khadijeh, JAVANBAKHT MEHRAN. NANOCOMPOSITE NAFION/POLYVINYL ALCOHOL MEMBRANES FOR THE PEM FUEL CELL. 2014. Available from: https://sid.ir/paper/912287/en

IEEE: Copy

Khadijeh Hooshyari, and MEHRAN JAVANBAKHT, “NANOCOMPOSITE NAFION/POLYVINYL ALCOHOL MEMBRANES FOR THE PEM FUEL CELL,” presented at the IRANIAN CHEMISTRY CONGRESS. 2014, [Online]. Available: https://sid.ir/paper/912287/en

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