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Optimal Effective Diffusion Coefficient of Oxygen in the Cathode Catalyst Layer of Polymer Electrode Membrane Fuel Cells

2009; Electrochemical Society; Volume: 12; Issue: 4 Linguagem: Inglês

10.1149/1.3072756

1944-8775

Andrei Kulikovsky,

Membrane-based Ion Separation Techniques

A model of cathode catalyst layer (CCL) performance by Perry et al. [ J. Electrochem. Soc. , 145 , 5 (1998)] shows that there exists optimal effective diffusion coefficient of oxygen , which provides close to minimal voltage loss in the CCL. The dependence has two slopes: at , decreases rapidly, whereas for , lowering of due to better oxygen transport is marginal. The value of is proportional to the product of cell current and CCL thickness. Oxygen diffusivity depends on CCL porosity; thus, may serve as a reference point for optimization of CCL porosity and related Nafion content.