Cathodes modelling

An examination of the catalyst-layer models reveals the fact that there are many more cathode models than anode ones. In fact, basically every electrode-only model is for the cathode. This arises because the cathode has the slower reaction it is where water is produced, and hence, mass-transfer effects are much more significant and it represents the principal inefficiency of the fuel cell. In other words, while the cathode model can be separate from the anode model, the converse is not true due to the... 

This equation is often used in the various cathode models. 

Figure 12. Comparison of simple macrohomogeneous agglomerate (solid line) and thin-film (dashed line) cathode models to experimental data (diamonds). Data are adapted from ref 34.

These are typically cathode models that include the diffusion medium and perhaps a membrane water flux. Next are the models that treat all of the layers of the sandwich and are only... 

Despite the fact that much effort has been made to model the DMFC system, considerable work remains, particularly in support of the emerging portable designs and systems. Few have treated the dominating effects of two-phase flow. No model to date has sufficient detail to provide a microfluidic theory for portable systems including effects of channel geometry and wettability characteristics of the GDL on fluid flow in the anode or cathode. Modeling studies are needed to fully elucidate the intricate couplings of methanol, water, and heat-transport... 

PEFC Cathode Modeling and Diagnostics Based on Impedance Spectra... 

In the following, a short overview of the most important assumptions and equations of the four electrode model categories is given. In addition, it is pointed out how the electrode models comply with the input/output scheme in Figure 28.3. The equations presented in this chapter are formulated in a general notation, which does not discriminate between anode and cathode models. 

Strange DA, Rayman S, Shaffer JS, White RE (2011) Physics-based lithium ion silver vanadium oxide cathode model. J Power Sources 196(22) 9708-9718. doi 10.1016/j.jpowsour.2011.07.057... 

Sun W, Peppley BA, Karan K. An improved two-dimensional agglomerate cathode model to study the influence of catalyst layer structural parameters. Electrochim Acta 2005 50.16 3359-74. 

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