Hydrogen crossover model

In a PEFC, oxygen and hydrogen crossover is important because of the obvious performance loss, the development of a mixed potential, and even durability issues due to hydrogen peroxide generation platinum migration, and possible carbon corrosion [69]. Furthermore, crossover becomes increasingly important as the membranes used become thinner. Presented in this section are the parameters and governing equations to model this phenomenon. 

The loss from this equivalent current can be modeled in the same way as hydrogen crossover shown in Chapter 4. 

The goal of this section is to describe a semiempirical model of nanoscale solvation that captures the dielectric modulation brought about by the approach of a hydrophobe to a protein hydrogen bond. In essence, the model captures the solvent-ordering effect promoted by the hydrophobe and quantifies the effect of this induced organization on the electrostatics of a pre-formed amide-carbonyl hydrogen bond. This model reproduces the crossover point in hydrogen bond dehydration... 

Synthesis gas production from combined CO2 reforming and partial oxidation of natural gas Maximization of both methane conversion and carbon monoxide selectivity while maintaining tiie hydrogen to carbon monoxide ratio close to 1. Real-coded NSGA with blend crossover Empirical models were used for optimization. Mohanty (2006)... 

Different response functions such as Cp and Up show maxima, and these maxima increase and seem to diverge as the critical pressure is approached, consistent with the Widom line picture discussed for other water models in the sections above. Moreover, the temperature derivative of the number of hydrogen bonds dAnB/dT displays a maximum in the same region where the other thermodynamic response functions have maxima, suggesting that the fluctuations in the number of hydrogen bonds is at a maximum at the Widom line temperature Tw. To further test whether this model system also displays a dynamic crossover as found in the other models of water, the total spin relaxation time of the system as a function of T for different... 

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