On the proton conductivity of Nafion-Faujasite composite membranes for low temperature direct methanol fuel cells

JOURNAL OF POWER SOURCES

卷:196

Article

Zhang, Zhonghua¹  Desilets, Francois^1,2  Felice, Valeria¹  Mecheri, Barbara^3,4  Licoccia, Silvia^3,4  Tavares, Ana C.¹ 

[1] Inst Natl Rech Sci Energie Mat & Telecommun, Varennes, PQ J3X 1S2, Canada

[2] Univ Sherbrooke, Dept Genie Chim & Biotechnol, Sherbrooke, PQ J1K 2R1, Canada

[3] Univ Roma Tor Vergata, Dept Chem Sci & Technol, I-00133 Rome, Italy

[4] Univ Roma Tor Vergata, NAST Ctr, I-00133 Rome, Italy

关键词: Direct methanol fuel cells;    Composite membrane;    Faujasite zeolite;    Nafion;    Proton conductivity;    States of water;   

DOI  :  10.1016/j.jpowsour.2011.07.009

来源: Elsevier

【 摘 要 】

Although zeolites are introduced to decrease methanol crossover of Nation membranes for direct methanol fuel cells (DMFCs), little is known about the effect of their intrinsic properties and the interaction with the ionomer. In this work, Nafion-Faujasite composite membranes prepared by solution casting were characterized by extensive physicochemical and electrochemical techniques. Faujasite was found to undergo severe dealumination during the membrane activation, but its structure remained intact. The zeolite interacts with Nation probably through hydrogen bonding between Si-OH and SO3H groups, which combined with the increase of the water uptake and the water mobility, and the addition of a less conductive phase (the zeolite) leads to an optimum proton conductivity between 0.98 and 2 wt% of zeolite. Hot pressing the membranes before their assembling with the electrodes enhanced the DMFC performance by reducing the methanol crossover and the serial resistance. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free