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Water free operated phosphoric acid doped radiation-grafted proton conducting membranes for high temperature polymer electrolyte membrane fuel cells

Işıkel Şanlı, Lale and Taş, Sinem and Yürüm, Yuda and Alkan Gürsel, Selmiye (2014) Water free operated phosphoric acid doped radiation-grafted proton conducting membranes for high temperature polymer electrolyte membrane fuel cells. Fuel Cells, 14 (6). pp. 914-925. ISSN 1615-6854 (Print) 1615-6854 (Online)

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Official URL: http://dx.doi.org/10.1002/fuce.201300110

Abstract

The present study uses the radiation-induced grafting method and applies it onto poly (ethylene-alt-tetrafluoroethylene) (ETFE) for the synthesis of proton-exchange membranes by using monomers 4-vinyl pyridine (4VP), 2-vinyl pyridine (2VP), N-vinyl-2-pyrrolidone (NVP) followed by phosphoric acid doping. Phosphoric acid that provides Grotthuss mechanism in proton mobilization is used to transform the graft copolymers to a high temperature membrane state. Resultant proton-exchange membranes are verified with their proton conductivity, water uptake, mechanical and thermal properties, phosphorous distribution as ex situ characterization. Our most important finding as a novelty in literature is that ETFE-g-P4VP phosphoric acid doped proton-exchange membranes exhibit proton conductivities as 66 mS/cm at 130 °C, 53 mS/cm at 120 °C, 45 mS/cm at 80 °C at RH 100% and 55 mS/cm at 130 °C, 40 mS/cm at 120 °C, 35 mS/cm at 80 °C at dry conditions. Moreover, ETFE-g-P4VP membranes still conserves the mechanical properties, i.e., tensile strength up to 48 MPa. ETFE-g-P4VP membranes were tested in PEMFC at 80 °C, 100 °C and 120 °C and RH <2% and exhibit promising performance as an alternative to commercial Nafion® membranes. The single cell testing performance of ETFE-g-P4VP membranes is presented for the first time in literature in our study.

Item Type:Article
Uncontrolled Keywords:Fuel Cell;High Temperature;Phosphoric Acid Doping;Radiation-Induced Grafting;Water Free Proton-Exchange Membranes
Subjects:T Technology > TP Chemical technology
T Technology > TJ Mechanical engineering and machinery
Q Science > QD Chemistry
ID Code:25454
Deposited By:Selmiye Alkan Gürsel
Deposited On:10 Dec 2014 11:52
Last Modified:09 May 2017 10:45

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