Polymer Electrolyte Membrane Fuel Cell

The objective is to study the characteristics of PEM fuel cell system based on experimental measurements, and computational fluid dynamics (CFD) simulations. Furthermore, study on the material characteristics is included.

(1) PEM fuel cell system:

- PEM Fuel Cell car modeling: System model for PEM fuel cell vehicle with validation in 80 kW-class automotive fuel cell is conducted to predict the system performance and show performance curve depending on interaction of blower and backpressure valve that have greay influence on the system output are blower and backpressure control valve.

- Thermal Management System for fuel cell system: Thermal management system for PEM fuel cell system is conducted to prevent dry out in the stack, and distribute uniform operating temperature among each cell. Using equivalent circuit concept, we can develope model for thermal management system.

- PEM Fuel cell for Submarine: PEM fuel cell system can operate at relatively low operating temperature, and is free from noise and heat detection. Therefore, PEM fuel cell can be used as an unmanned underwater vehicle system. However, there are many research topics associated with system characteristics of underwater vehicle.

(2) Mass transport in materials :

- Water transport through Nafion membrane: The novel model to explain the mechanism of water transport through Nafion® 117 is developed to understand the effects of parameters, such as phase difference, pressure, mass flow rate, and temperature. The model considers the morphology of the polymer membrane and the characteristics of water uptake as well adopts four different processes depending on its relative humidity.

- Effects of aisotropic bending stiffness of gas diffusion layer on the MEA degradation: We have investigated the effect of in-plane anisotropic characteristics on the mechanical degradation of an MEA using an AST. The wet/dry cycling method was adopted to cause mechanical degradation of the MEA. The I–V performances and HFRs of the 90° GDL fuel cell, whose higher bending stiffness direction is perpendicular to the direction of the major flow field, and 0° GDL fuel cell, whose higher bending stiffness direction is parallel to the direction of the major flow field, were measured every 500 cycles and hydrogen crossover rates were measured every 1000 cycles.

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