Analysis of Current Density and Water Distribution on PEM Fuel Cell
Date Issued
2005
Date
2005
Author(s)
Wu, Pei-shan
DOI
zh-TW
Abstract
In PEMFC, polymer membrane requires supplying with water in order to retain its proton conductivity, which depends strongly on the water management, which is essential for the enhancement of cell performance.
This experiment displays a novel method that provides a window which shows the distribution of liquid water in a fuel cell under operation. This specially designed cell is intended for use in studies on time and location measured current densities with different humidification and flow field design. Current distribution was measured by shunts with current multiplex method connected to the corresponding segments. Furthermore, image of water formed inside the cathode is presented to explain the phenomenon of water flooding in the gas channels.
There are two kinds of flow field in this experiment operated with different gas flow rates、heating temperatures. The results present with one hydrogen inlet in the anode, the performance is diminished with increasing gas flow rate; contrary to one hydrogen inlet, with two hydrogen inlets in the anode, the performance is increasing with increasing gas flow rate.
Subjects
質子交換膜燃料電池
電流密度
液態水分佈
polymer exchange membran fuel cell(pemfc)
current density
liquid water distribution
Type
thesis
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