By Andrei A Kulikovsky
In gas phone research, the hole among primary electrochemical methods and the engineering of gasoline telephone structures is bridged by means of the actual modelling of gas cells. This rather new self-discipline goals to appreciate the fundamental delivery and kinetic phenomena in a true mobile and stack surroundings, paving the way in which for better layout and function. The author brings his new angle to the analytical modeling of gasoline cells to this crucial reference for power technologists. Covers contemporary advances and analytical strategies to quite a number difficulties confronted via strength technologists, from catalyst layer functionality to thermal balance offers exact graphs, charts and different instruments (glossary, index) to maximise R&D output whereas minimizing expenditures and time spent on dead-end researchPresents Kulikovsky's signature technique (and the information to help it)-which makes use of "simplified" versions in line with idealized platforms, uncomplicated geometries, and minimum assumptions-enabling qualitative figuring out of the explanations and results of phenomena
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Extra resources for Analytical Modelling of Fuel Cells
FUEL CELL BASICS ORR occurs at the catalyst surface, which has the potential of the electron-conducting phase ϕ in the CL. Protons, however, move in the polymer electrolyte phase, which has the potential ϕm . 3 shows that, on the cathode side, to reach the catalyst surface the proton must overcome the potential jump η = ϕm − ϕ (overpotential)18 . The rate of heat production due to this so-called irreversible heating is Rη = η c Q. 80) Another source of heat in the CL is the Joule electric power dissipated due to currents.
With this data we get lf 3 · 10−6 cm, or 3 · 10−2 µm. 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.
52 CHAPTER 2. 58) we get 1 ε ln 2ε˜j0 coth = ln ε2 ˜j02 or ε˜j0 = 2 coth 1 ε . 4). 4, left plot)3 . 4 give us the following accurate limits of validity of low- and high-current approximations: ε˜j0 < coth ε˜j0 > 4 coth 1 ε , 1 ε low-current limit , high-current limit. 64) Importantly, the regime of catalyst layer operation depends on parameter ε. The transition from low- to high-current mode occurs in the transition region coth 1 ε 1 ε ≤ ε˜j0 ≤ 4 coth . For small and large ε this inequality reduces to 1 ≤ ε˜j0 ≤ 4, 1 ≤ ˜j0 ≤ 4, Note that for ε position.