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By Andrei A Kulikovsky

In gasoline mobile research, the hole among primary electrochemical procedures and the engineering of gas phone structures is bridged via the actual modelling of gasoline cells. This really new self-discipline goals to appreciate the fundamental delivery and kinetic phenomena in a true mobilephone and stack atmosphere, paving the best way for stronger layout and function. The author brings his new angle to the analytical modeling of gas cells to this crucial reference for power technologists. Covers fresh advances and analytical suggestions to a number difficulties confronted via power technologists, from catalyst layer functionality to thermal balance offers specified graphs, charts and different instruments (glossary, index) to maximise R&D output whereas minimizing bills and time spent on dead-end researchPresents Kulikovsky's signature strategy (and the information to help it)-which makes use of "simplified" versions according to idealized platforms, easy geometries, and minimum assumptions-enabling qualitative figuring out of the motives and results of phenomena

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1 Basic equations Ideal proton transport means that the overpotential gradient is small. 12) η˜ η˜0 and omitting Eq. 11) we arrive at ∂ ˜j = −˜ cφ(˜ η0 ) ∂x ˜ c ˜ ∂˜ D = ˜j0 − ˜j. 9). 66) with respect to x ˜ and excluding ∂˜ c/∂ x ˜ with Eq. 68) where φ0 ≡ φ(˜ η0 ). 69) where ζ= φ0 . 70) 54 CHAPTER 2. 5: The shapes of the local current density and oxygen molar concentration across the catalyst layer for the diffusion-limited case. 1, ε = 1, and ˜j0 = 1. 66) for c˜ we get c˜ = − ε2 φ0 ∂ ˜j =− ∂x ˜ c˜ = ˜j0 cosh(ζ x ˜) .

2008b)). In contrast, transport properties of porous layers are poorly known, which makes modelling of two-phase flows in these layers more difficult and less reliable. 6 Mass transport in gas-diffusion/backing layers Fick’s diffusion Fuel cells usually operate at equal pressures on the anode and cathode sides. In these conditions, the main mechanism of feed molecule transport through the GDL to the catalyst layer is diffusion due to the concentration gradient. 8 and with the mean pore radius in the order of 10 µm (10−3 cm).

Obviously, mean pore radius in the GDL is nearly 3 orders of magnitude greater than lf and the physical mechanism of molecule transport is binary molecular diffusion. Oxygen constitutes 21% of air and to a good approximation it may be treated as a small component. The diffusion flux of a small component in a mixture of gases is described by Fick’s law: Nox = −Dox ∇cox . 52) Here Nox is the oxygen molar flux (mol cm−2 s−1 ), Dox is the oxygen diffusion coefficient (cm2 s−1 ) in the nitrogen-oxygen mixture (air) and cox is the oxygen molar concentration.

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