PEM fuel cells in a Ballard Nexa stack were analyzed via AC impedance using a Gamry FC350 monitor and a TDI electronic load. Single MEAs, multiple MEA cell groups, and full 47 MEA stacks were examined. Impedance results were successfully fit to equivalent circuit diagrams containing charge transfer polarization resistances related to activation energies, uncompensated resistances related to the...

in this paper, a non-isothermal two-phase flow in the cathode gas diffusion layer (gdl) of pem fuel cell is modeled. the governing equations including energy, mass and momentum conservation equations are solved by numerical methods. also, the optimal values of the effective parameters such as the electrodes porosity, gas diffusion layer (gdl) thickness and inlet relative humidity are calculated...

To simulate a new economical architecture for PEM fuel cell and investigate the effectiveness of the introduced structure on the performance, computational fluid dynamics (CFD) code is used to solve the equations for a single domain of the cell namely: the flow field, the mass conservation, the energy conservation, the species transport, and the electric/ionic fields under the assumptions of st...

In recent years, the penetration of fuel cells in distribution systems is significantly increased worldwide. The cell considered an electrochemical energy conversion component. It has ability to convert chemical electrical energies as well heat. proton exchange membrane (PEM) uses hydrogen and oxygen fuel. a low-temperature type that noble metal catalyst, such platinum, at reaction sites. optim...

In this paper, a solution for the oxygen stoichiometry control problem for Proton Exchange Membrane (PEM) fuel cells is presented. The solution relies on the use of a reference model, where the resulting nonlinear error model is brought to a Takagi-Sugeno (TS) form using the non-linear sector approach. The TS model is suitable for designing a controller using Linear Matrix Inequalities (LMI)-ba...