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By Andrei A Kulikovsky

In gasoline mobilephone research, the hole among basic electrochemical approaches and the engineering of gas telephone structures is bridged by way of the actual modelling of gasoline cells. This quite new self-discipline goals to appreciate the elemental delivery and kinetic phenomena in a true cellphone and stack atmosphere, paving the way in which for greater layout and function. The author brings his new angle to the analytical modeling of gasoline cells to this crucial reference for power technologists. Covers fresh advances and analytical ideas to a variety of difficulties confronted by means of strength technologists, from catalyst layer functionality to thermal balance presents unique 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 knowledge to aid it)-which makes use of "simplified" versions in response to idealized platforms, uncomplicated geometries, and minimum assumptions-enabling qualitative knowing of the explanations and results of phenomena

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2 Ideal oxygen and proton transport This is the case of an ideal catalyst layer with no transport losses. In Eq. 12). The system discussed here reduces to a single equation ε2 ∂ ˜j = −φ0 . 24) The solution to this equation is a straight line ˜j = φ0 (1 − x ˜). 25) Setting x ˜ = 0 here we get the polarization curve of the catalyst layer ε2 ˜j0 = φ0 . 8) we finally obtain η˜0 = arcsinh ε2 ˜j0 . 3 IDEAL OXYGEN TRANSPORT 45 This is the general polarization curve of an ideal catalyst layer. If ε2 ˜j0 ≥ 2 the function arcsinh can be replaced by the logarithm of the double argument and we get η˜0 = ln 2ε2 ˜j0 , ε2 ˜j0 ≥ 2.

As in a PEFC, in a DMFC the anode and cathode are separated by a polymer electrolyte membrane, typically Nafion r . These cells also operate in the temperature range of 30-90 ◦ C. Unlike the PEFC, the DMFC is fed with a liquid methanol-water solution, which makes the DMFC-based power sources much more compact. However, liquid methanol easily penetrates the membrane into the cathode side, where it is directly oxidized. This parasitic process dramatically reduces the DMFC open-circuit voltage. Another problem specific to DMFCs is the large amount of gaseous CO2 on the cathode side.

54) where β= ˜ 0 − ˜j 2 . 54) in Eq. 38) we get η˜: η˜ = arcsinh β 2 ε2 2 1 + tan2 β (1 − x ˜) 2 . 3 for two values of The shapes ˜j(˜ x), η˜(˜ x) and Q(˜ parameter β and ε = 1. This figure shows the physical origin of the Tafel slope doubling in the high-current regime (see the next page). Poor proton transport induces a 50 CHAPTER 2. CATALYST LAYER PERFORMANCE peak of the reaction rate at the membrane interface, where the expenditure for proton transport is lower. The nonuniform conversion of proton current is costly in terms of η˜.

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