Modeling of a high temperature PEM fuel cell

Sezgin, Berna
High temperature polymer electrolyte membrane fuel cells (HT-PEMFC) are considered as the next generation of fuel cells since high temperature operation for PEM fuel cells has several advantages such as single phase operation, high carbon monoxide tolerance, low or zero carbon emission and removal of some equipment from the system. In order to obtain high performances, HT-PEMFC systems should be optimized in terms of dimensions, materials, operating conditions and other parameters. Modeling can help to pre-estimate the effects of different design parameters and operating conditions on the fuel cell performance, which shortens the required time for these analysis in reference to the time spent for experiments. In this study, three-dimensional (3-D) model of HT-PEMFC is developed. The model is implemented as isothermal and steady-state. Model domains are considered for two different geometries: single flow channel and multiple flow channels. Models are simulated by using licensed software package program Comsol Multiphysics 5.0, and its Fuel Cells & Batteries module. The program has solved the governing equations by finite element method. Moreover, it is an advantage to use this program for HT-PEMFC modeling by the reason of including Fuel Cell module. In the scope of this study, some critical parameters are prescribed as effective parameters for HT-PEMFC performance. These are inlet velocities (or flow rates) of reactant gases to the both anode and cathode inlet gas channels, conductivity of the membrane and meshing strategy. Influences of inlet velocities of reactant gases and conductivity of the membrane are studied for both single channel and multiple channel HT-PEMFC models, while influence of meshing strategy is studied for only multiple channel HT-PEMFC model. It is seen that increasing inlet velocities of reactants (hydrogen and air) enhances HT-PEMFC performance as long as enough oxygen is supplied to the system. In addition, increasing proton conductivity of the membrane provides better performance for both channel geometries. For the effect of meshing strategy, it is found that the results are more accurate for small size of mesh elements. For all models that have been developed are validated with the experimental data.


Modeling and sensitivity analysis of high temperature PEM fuel cells by using Comsol Multiphysics
Sezgin, Berna; Caglayan, Dilara Gulcin; DEVRİM, YILSER; Steenberg, Thomas; Eroğlu, İnci (2016-06-22)
The objective of this study is to observe the effect of the critical design parameters, velocities of inlet gases (hydrogen and air) and the conductivity of polymer membrane, on the performance of a high temperature PEM fuel cell. A consistent and systematic mathematical model is developed in order to study the effect of these parameters. The model is applied to an isothermal, steady state, three-dimensional PEM fuel cell in order to observe concentration profiles, current density profiles and polarization ...
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Solid oxide fuel cells are environmentally friendly, efficient and fuel versatile energy conversion devices which suffer from high operating temperatures. For lowering the operating temperatures of solid oxide fuel cells (SOFC), LSC-113/LSC-214 composite cathodes have recently attracted much attention due to their enhanced kinetics. However, the full potential of this novel system is still unknown. In this study, a combinatorial approach was used to develop cathode materials which would reduce operating tem...
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Cross-linked polybenzimidazole membranes for high temperature PEM fuel cells
Özdemir, Yağmur; Özkan, Necati; Devrim, Yılser; Department of Polymer Science and Technology (2018)
Literature studies have shown that it is desirable to increase operation temperature of Proton Exchange Membrane Fuel Cells (PEMFCs) due to the reasons like reduced fuel impurity sensitivity, fast electrode kinetics, simple thermal and water management. However, during fuel cell operation at high temperatures, the PEM suffers from inevitable leaching out of the doped acid, which can have deteriorating effect on the membrane performance. Thus, there is always a need to minimize this problem by making ways so...
Citation Formats
B. Sezgin, “Modeling of a high temperature PEM fuel cell,” M.S. - Master of Science, Middle East Technical University, 2016.