||The experimental tests and analysis of a fuel cell unit and a 150 W fuel cell stack are performance in this research. The experimental items in this study are various the types of flow channels, fasten torque, inlet gas pressure, Pt loading density, oxidizers, electron collector type etc. Through above a series of the tests, we can understand the key factors which influence the performance of the PEMFC. The experimental results can also provide us references when one assemble a fuel cell stack in future.|
PEMFC can start quickly at low temperature and achieves stable output voltage. When the 8 N-M torque is applied to fasten the reaction chamber, the contact resistance between electrode and electron collector reaches a minimum value. By designing the flow channel properly, the membrane hydration can remain a good state so that the conductivity of the proton exchange membrane can not be hinder. We found that the optimum channel among three types of the test channels is the conventional channel with the rib width 2 mm. When the output power is largest.
Our experiments display that the increase of Pt loading in cathode can improve PEMFC performance. At certain voltage, there is a critical value in Pt loading. PEMFC performance can not be improved when Pt loading increases over this value. When the inlet pressure in cathode side increase to 10~20 psi higher than the pressure in anode side, the output power can improve apparently.
Keyword: Proton exchange membrane, Pt loading, electron collector.