Effect of varying poly(styrene sulfonic acid) content in poly(vinyl alcohol)–poly(styrene sulfonic acid) blend membrane and its ramification in hydrogen–oxygen polymer electrolyte fuel cells

Sahu, AK and Selvarani, G and Bhat, SD and Pitchumani, S and Sridhar, P and Shukla, AK and Narayanan, N and Banerjee, A and Chandrakumar, N (2008) Effect of varying poly(styrene sulfonic acid) content in poly(vinyl alcohol)–poly(styrene sulfonic acid) blend membrane and its ramification in hydrogen–oxygen polymer electrolyte fuel cells. In: Journal of Membrane Science, 319 (1-2). pp. 298-305.

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Abstract

Poly(styrene sulfonic acid) (PSSA) content in poly(vinyl alcohol) (PVA) and PSSA blend membrane is varied and its effect on proton conductivity is studied at varying relative humidity (RH) values. The maximum proton conductivity is observed for the PVA–PSSA membrane with about 35 wt. % PSSA at all humidity values. At 30% RH value, the conductivity of PVA–PSSA blend membrane is $1.20 \times 10^{-3} S/cm$, which is about two orders of magnitude higher than the conductivity value of $2.27 \times 10^{-5} S/cm$ observed for pristine PVA membrane. Water self-diffusion coefficients and water release kinetics of these materials have been characterized by nuclear magnetic resonance (NMR) imaging technique, which validate the use of this membrane in polymer electrolyte fuel cells (PEFCs). A peak power density of $210 mW/cm^2$ at a load current-density of $500 mA/cm^2$ is achieved for the PEFC with the optimized PVA–PSSA membrane as electrolyte compared to a peak power density of only $38 mW/cm^2$ observed at a load current-density of $80 mA/cm^2$ for the PEFC with pristine PVA membrane as electrolyte while operating at 75 °C with $H_2$ and $O_2$ feeds to the fuel cell maintained at atmospheric pressure.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Proton conductivity;Cross-linked poly(vinyl alcohol)membrane;Poly(styrene sulfonic acid);Hydrogen/oxygen fuel cells. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 01 Aug 2008 19 Sep 2010 04:48 http://eprints.iisc.ernet.in/id/eprint/15366