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Metadata of CSIR Papers


Field	Value

Creator	Bhat, SD Sahu, AK Jalajakshi, A Pitchumani, S Sridhar, P George, C Banerjee, A Chandrakumar, N Shukla, AK

Subject	Electrochemistry; Materials Science

Description	Stabilized forms of heteropolyacids (HPAs), namely phosphomolybdic acid (PMA), phosphotungstic acid (PTA), and silicotungstic acid (STA), are incorporated into poly (vinyl alcohol) (PVA) cross-linked with sulfosuccinic acid (SSA) to form mixed-matrix membranes for application in direct methanol fuel cells (DMFCs). Bridging SSA between PVA molecules not only strengthens the network but also facilitates proton conduction in HPAs. The mixed-matrix membranes are characterized for their mechanical stability, sorption capability, ion-exchange capacity, and wetting in conjunction with their proton conductivity, methanol permeability, and DMFC performance. Methanol-release kinetics is studied ex situ by volume-localized NMR spectroscopy (employing "point-resolved spectroscopy") with the results clearly demonstrating that the incorporation of certain inorganic fillers in PVA-SSA viz., STA and PTA, retards the methanol-release kinetics under osmotic drag compared to Nafion, although PVA-SSA itself exhibits a still lower methanol permeability. The methanol crossover rate for PVA-SSA-HPA-bridged-mixed-matrix membranes decreases dramatically with increasing current density rendering higher DMFC performance in relation to a DMFC using a pristine PVA-SSA membrane. A peak power density of 150 mW/cm(2) at a load current density of 500 mA/cm(2) is achieved for the DMFC using a PVA-SSA-STA-bridged-mixed-matrix-membrane electrolyte. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3465653] All rights reserved.

Publisher	ELECTROCHEMICAL SOC INCPENNINGTON65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA

Date	2011-09-20T11:59:54Z 2011-09-20T11:59:54Z 2010

Type	Article

Identifier	JOURNAL OF THE ELECTROCHEMICAL SOCIETY 0013-4651 http://hdl.handle.net/123456789/11388

Language	English