Read e-book online Analytical Modelling of Fuel Cells PDF

By Andrei A Kulikovsky

ISBN-10: 0444535608

ISBN-13: 9780444535603

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

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Functional models discussed below predict the distribution of local currents, reaction rate and species concentration in the CL. The distributions of local values are of great theoretical interest; however, these distributions cannot be directly measured, at least with the present level of experimental techniques. Measurable quantities are the total current converted in the CL and the respective voltage loss (CL polarization curve). The primary goal of functional models is to derive the CL polarization curve.

6(a) and (b)). 6(b)). Qualitatively, at x ˜ = 1 oxygen concentration is high and large η˜(1) maximizes the reaction rate at this point. However, high η˜(1) shifts the whole curve η˜(˜ x) upward, since the derivative ∂ η˜/∂ x ˜ = −j must be negative. 8. These figures display an important feature of CCL performance. 58 CHAPTER 2. 8). 7). 8). In dimension variables Eq. 79) takes the form D∗ = j 0 lt . 8). Higher diffusivity means higher CCL porosity, which is usually achieved at the cost of lower Nafion content and thus of lower proton conductivity.

2004). This mechanism is accompanied by a diffusion of the H3 O+ ion (Walbran and Kornyshev, 2001). Some contribution to the current gives direct proton hopping between the two SO− 3 groups located at the pore wall. In analytical modelling the membrane is usually treated as a continuum with the prescribed transport parameters. (Alternative approaches are discussed in Weber and Newman (2004, 2007)). 67) where Em is the electric field strength in the membrane. The membrane proton conductivity σm depends on membrane water content.

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Analytical Modelling of Fuel Cells by Andrei A Kulikovsky

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