Abstract
Raising the operating temperature is considered to be an effective method to improve the output performance of proton exchange membrane fuel cells (PEMFCs). In this paper, the effects of inlet relative humidity in the anode (RHa) and cathode (RHc) on the polarization curve and impedance spectra of a single rotating serpentine PEMFC were investigated by experimental method at the operating temperature of 90 °C. It was found that the output performance is the smallest in the high RH case (RHa90%/RHc90%) due to the largest mass transfer resistance. However, the ohmic resistance in the dry case (RHa50%/RHc50%) is the highest, and it shows better output performance at more than 1.0 A/cm2 because of the lowest mass transfer resistance. The impact of the changes in the RHa value on the polarization curve is more apparent than that of the RHc changes at high current density. The largest power density can be attained and the efficiency can reach 24.4% when the RHa is 90% and RHc is 50%.
Highlights
The operating temperature of a proton exchange membrane fuel cells (PEMFCs) is mainly limited to the range of 60 to 80 ◦ C
The relative humidity in the anode (RHa) was changed from 50 to 90%, and the RHc was kept at 90%
The effects of the relative humidity (RH) at anode and cathode, which are important for a PEMFC, were analyzed and compared anode and cathode, which are important a PEMFC, were analyzed and comat
Summary
The high reliance on fossil products for modern industrial production and transportation and their environmental impacts cause the finding of the alternative energy-generation forms to be a matter of great urgency [1]. A proton exchange membrane fuel cell (PEMFC). Is an energy converting device that uses the chemical energy from hydrogen and oxygen to produce electricity directly. Thanks to the merits of the PEMFC, such as higher power density, less noise pollution, zero emissions and easy maintenance, it is considered as the most promising electric generation and power unit [2]. The operating temperature of a PEMFC is mainly limited to the range of 60 to 80 ◦ C.
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