New PDF release: Fuel Cell Chemistry and Operation

By Andrew M. Herring, Thomas A. Zawodzinski, Jr., and Steven J. Hamrock (Eds.)

ISBN-10: 0841225699

ISBN-13: 9780841225695

ISBN-10: 0841225702

ISBN-13: 9780841225701

content material: PREFACE; 1. prestige of gasoline Cells and the demanding situations dealing with gasoline mobile know-how this day; KATHI EPPING MARTIN, JOHN P. KOPASZ, AND KEVIN W. MCMURPHY; 2. Membranes for PEM gasoline Cells Michael A. Yandrasits and Steven J. Hamrock; three. Synthesis and Characterization of Poly(vinylidene fluoride)-g-Sulfonated Polystyrene Graft Copolymers for Proton trade Membrane; ZHICHENG ZHANG, ELENA CHALKOVA, MARK FEDKIN, CHUNMEI WANG, SERGUEI N. LVOV, SRIDHAR KOMARNENI, AND T. C. CHUNG; four. inflexible Rod Polyelectrolytes with Frozen-In loose quantity: excessive Conductivity at Low RH; MORTON LITT, SERGIO GRANADOS-FOCIL, AND JUNWON KANG; five. Molecular Weight results on Poly(arylene ether sulfone)-Based Random and Multiblock Copolymers features for gasoline Cells; ANAND S. BADAMI, HAE-SEUNG LEE, YANXIANG LI, ABHISHEK ROY, grasp WANG, AND JAMES E. MCGRATH; 6. Mesoscopic Simulations of the Hydrated Morphology of the Short-Side-Chain Perfluorosulfonic Acid Ionomer; DONGSHENG WU AND STEPHEN J. PADDISON; 7. Broadband Dielectric Spectroscopy and Conductivity Mechanism of Nafion 117 and Nafion/[ZrO2] Hybrid Inorganic-Organic Membranes; V. DI NOTO, E. NEGRO, AND S. LAVINA; eight. Broadband Dielectric Spectroscopic experiences of Nafion/Silicate Membranes; MOHAMMAD ok. HASSAN AND KENNETH A. MAURITZ; nine. Chemical sturdiness reviews of PFSA and Nonfluorinated PEM fabrics; DAVID A. SCHIRALDI, CHUN ZHOU, DEEPA SAVANT, AND THOMAS A. ZAWODZINSKI JR; 10. Open Circuit Voltage gasoline mobile sturdiness checking out utilizing a number of PEM MEAs; GREG HAUGEN, SARA BARTA, MIKE EMERY, STEVEN HAMROCK, AND MIKE YANDRASITS; eleven. steel Oxides and Heteropoly Acids as Anodic Electrocatalysts in Direct Proton trade Membrane gas Cells; JACK R. FERRELL III AND ANDREW M. HERRING

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ACS Symposium Series; American Chemical Society: Washington, DC, 2010. ch002 often soluble in water. A general scheme for crosslinking PFSA ionomers was discussed as one way to address this problem. The implications for conductivity at both saturated conditions and low humidity conditions were discussed in terms of expected proton conductivity. Preliminary conductivity data for one system was shown. As expected, this system had lower conductivity at the saturated condition compared to a control.

For comparison, Nafion 112 (a random copolymer) was also measured under similar conditions. As expected, the conductivity exponentially increases with RH, and it requires more than 60% RH to show significant proton conductivity. In the RH >60% range, the B1-2 membrane shows notably higher proton conductivity than Nafion 112 in all three measured temperatures (30, 80, and 120 °C), but Nafion 112 performs better under low RH conditions, especially at 120 °C. This conversion may be related to the water content (λ).

ACS Symposium Series; American Chemical Society: Washington, DC, 2010. edu Aromatic rigid-rod polyelectrolytes have been made that have “frozen-in free volume”. Homopolymers and copolymers form liquid crystalline arrays that cannot pack closely due to steric hindrance. They form nano-channels that absorb and hold water very strongly. This enables them to retain conductivity at very low relative humidities. Conductivity versus λ at various temperatures for two homopolymers, poly(p-phenylene 2, 5-disulfonic acid), PPDSA, and poly(p-biphenylene 3, 3’-disulfonic acid), PBPDSA, is shown.

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Fuel Cell Chemistry and Operation by Andrew M. Herring, Thomas A. Zawodzinski, Jr., and Steven J. Hamrock (Eds.)


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