Download Analytical Modelling of Fuel Cells by Andrei A Kulikovsky PDF

By Andrei A Kulikovsky

In gas cellphone research, the hole among basic electrochemical techniques and the engineering of gas cellphone structures is bridged by way of the actual modelling of gas cells. This quite new self-discipline goals to appreciate the fundamental delivery and kinetic phenomena in a true telephone and stack atmosphere, paving the best way for enhanced layout and function. The author brings his special approach to the analytical modeling of gasoline cells to this crucial reference for strength technologists. Covers contemporary advances and analytical recommendations to quite a number difficulties confronted via strength technologists, from catalyst layer functionality to thermal balance offers distinct graphs, charts and different instruments (glossary, index) to maximise R&D output whereas minimizing charges and time spent on dead-end researchPresents Kulikovsky's signature procedure (and the knowledge to help it)-which makes use of "simplified" types in accordance with idealized structures, easy geometries, and minimum assumptions-enabling qualitative knowing of the reasons and results of phenomena

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Additional info for Analytical Modelling of Fuel Cells

Example text

As can be seen, the variation of the drag coefficient with water content is not large and to a first approximation it can be neglected. However, the variation of proton conductivity and of the diffusion coefficient with λw is significant and, in general, it should not be ignored. Importantly, at zero λw the water diffusion coefficient in the membrane vanishes. To illustrate the effect of vanishing Dw we will approximate Dw with a less accurate but simpler relation Dw = D0 1 − exp − λw λ∗ , where D0 is the “bulk” diffusion coefficient of water in pure water and λ∗ is the characteristic value of water content.

007192, Ω cm−1 . 25, which corresponds to a percolation threshold in the waterfilled cluster. , 1991). Protons in the membrane drag water molecules. 69) where nd is the drag coefficient, the number of water molecules transported by a single proton. Here the first term describes water transport due to diffusion and the second term accounts for the electro-osmotic drag. 15 This statement is correct on a time scale in the order of proton transport through the membrane. On larger time scales, membrane morphological changes lead to a redistribution of negative SO− 3 groups.

4 MASS TRANSPORT IN FUEL CELLS 29 order of 101 -102 V cm−1 . In this field, protons move along the water-filled channels. The membrane is, therefore, a special case of plasma, in which positive species can move while the negative species are immobile15 . Let the anode side of a hydrogen cell inject a single proton into the plasma of the membrane. The excess proton forms a Zundel ion H5 O+ 2 with two H2 O molecules, or an Eigen ion H9 O+ 4 with three H2 O molecules. , 2004). This mechanism is accompanied by a diffusion of the H3 O+ ion (Walbran and Kornyshev, 2001).

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