...Jessica A. May; Michael W. Ellis; David A. Dillard; Scott W. Case; Robert B. Moore; Yonqiang Li; Yeh-Hung Lai; Craig A. Gittleman Proton exchange membranes (PEMs) in operating fuel cells are subjected to varying thermal and hygral loads while under mechanical constraint imposed within...

...Shuang Ma Andersen Nafion 212 membrane was subjected to swelling–dehydration (SD) cycles, as a relevant operation condition for direct methanol fuel cells (DMFCs). The major degradation mechanism due to the treatment was found to be sulfonic group contamination with trace ion, rather than formation...

... their structural, morphological, mechanical, and other properties. Ion exchange capacity (IEC) of SPES/APEI and SPES/PEI blend membranes was determined to be 3.0 and 2.7 meq g −1 , which is a substantial improvement over the 1.0 meq g −1 exhibited by unmodified PES/PEI blend. The proton conductivity of 0.093 S cm...

...Kais Brik; Faouzi Ben Ammar; Abdesslam Djerdir; Abdellatif Miraoui This paper presents a reliability approach to analyze the degradation of proton exchange membrane fuel cell. This approach is based on the dependability analysis tools such as the causal and fault trees to establish an analysis...

...Peter O. Osifo; Aluwani Masala The chitosan membranes with different degrees of deacetylation (dda), prepared from Cape rock lobster collected from the surroundings of Cape Town, South Africa were characterized for suitability in methanol fuel cell applications. A comparison of chitosan membranes...

...Jinfu Ma; Yongning Liu The use of noble catalysts and ion exchange membranes make the design of a direct borohydride fuel cell (DBFC) stack complicate and limit its application. Therefore, the development of simple, cost effective construction for DBFC stacks is necessary. In this paper, a passive...

...Derek W. Fultz; Po-Ya Abel Chuang Two fuel cell architectures, differing only by the surfaces onto which the electrodes were applied, have been analyzed to determine the root causes of dissimilarities in performance. The basic proton exchange membrane fuel cell is comprised of the proton...

...Shinn-Dar Wu; Chang-Pin Chou; Ay Su; Jenn-Jiang Hwang This paper aims to analyze the membrane electrode assembly (MEA) of the direct methanol fuel cell (DMFC) in order to provide a reference for the design of DMFC. The slow kinetics of methanol oxidation and whether the anode should be hydrophobic...

...K. L. Bhamidipati; T. A. L. Harris Cost, durability, and reliability are the major issues hindering the commercialization of polymer electrolyte membrane fuel cells. Electrolyte membranes present in the fuel cell fails under chemical, thermal, and mechanical influences, which, in turn, results...

...Daniel F. Walczyk; Jaskaran S. Sangra The feasibility of an alternative fuel cell architecture, called a ribbon membrane electrode assembly (MEA), is demonstrated for low-temperature polymer electrolyte membrane (PEM) fuel cells used in portable power applications by comparing it to a traditional...

...Michael Pestrak; Yongqiang Li; Scott W. Case; David A. Dillard; Michael W. Ellis; Yeh-Hung Lai; Craig S. Gittleman Long-term durability of the membrane electrode assembly (MEA) in proton exchange membrane (PEM) fuel cells is one of the major technological barriers to the commercialization of fuel...

...Serhat Yesilyurt Performance degradation and durability of polymer electrolyte membrane (PEM) fuel cells depend strongly on transport and deformation characteristics of their components especially the polymer membrane. Physical properties of membranes, such as ionic conductivity and Young’s modulus...

...Sébastien Wasterlain; Denis Candusso; Fabien Harel; Xavier François; Marie-Cécile Péra; Daniel Hissel A three-cell polymer electrolyte membrane fuel cell stack equipped with perfluorinated ionomer membranes is tested for 1000 h in severe operating conditions. The fuel cell (FC) is fed by dry...

...Yen-Zen Wang; Ko-Shan Ho; Shinn-Dar Wu; Kuo-Huang Hsieh; Chi-Hung Lee A novel epoxy-based semi-interpenetrating polymer networks membrane (SPIX-EP40) as the proton exchange membrane was prepared by a flexible epoxy network with sulfonated polyimide. A series of sulfonated polyamic acid (SPAA) were...

...Tequila A. L. Harris; Daniel F. Walczyk; Mathias M. Weber The most important component of the fuel cell is the membrane electrolyte, having the fundamental responsibility of separating protons and electrons. Minor defects (e.g., pin holes) in the film will cause premature and/or catastrophic...

...Tequila A. L. Harris; Daniel F. Walczyk; Mathias M. Weber In this paper, a complex system of theoretical models, which predicts flow rate as a function of pressure drop, formulated previously by Harris et al. (2007, “Manufacturing of High-Temperature Polymer Electrolyte Membranes—Part I: System...

...Susanta K. Das; Panini Kolavennu; J. Hedrick; L. Beholz; Ali R. Zand; K. J. Berry A new proton exchange membrane (PEM) has been fabricated using a novel patented polymer structure modification technology. It has been shown that the new membrane has a higher proton transfer rate and lower resistance...

... (GDC) electrolyte with a NiO–GDC anode on a porous La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ ∕GDC tube ( 460 μ m wall thickness and 2.26 mm diameter). Densification of the ceria membrane (thickness < 20 μ m ) was successful by cosintering the laminated thin electrolyte and the anode with the cathode...

...Guo-Bin Jung; Ay Su; Cheng-Hsin Tu; Fang-Bor Weng; Shih-Hung Chan; Ruey-Yi Lee; Szu-Han Wu The performances of direct methanol fuel cells are largely dependent on the methanol crossover, while the amount of methanol crossover is reported to strongly rely on membrane materials and thickness...

...Stefano Cordiner; Vincenzo Mulone; Fabio Romanelli The use of proton exchange membrane fuel cells (PEFC) based power trains and stationary systems has been technically demonstrated but is still far from commercial application. Technical development is still required to reach cost and durability...