Polymeric membrane fuel cell stack
A fuel cell and battery technology, applied in the direction of fuel cells, fuel cell groups, fuel cell additives, etc., can solve problems such as excessive requirements and impossibility of implementation
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Embodiment 1
[0036] assembly corresponding to Figure 5 The design of the device, the device includes an active area of 0.1m 2 25 fuel cells connected in series, and 5 wetting pools at one end of the filter press array forming a single wetting zone; the filter press array is set up so that all 5 wetting pools are used to wet the supply to The same reagent as the device. The fuel cell included a 2 mm thick gasket as shown in Figure 2, and a filler material made of 2 mm thick 50% porosity nickel-chromium foam. The same filler material was used for the gasket in the wetted area, also 2 mm thick.
[0037] Pure hydrogen supplied to the dead-end (i.e. without any recirculation, wherein the amount of hydrogen consumed by the reaction is continuously replenished by pressure equalization; only periodic purges are used to remove accumulated inert gases during operation) and filtered and Compressed ambient air was used to run the stack obtained above. The air flow is twice the stoichiometric re...
Embodiment 2
[0039] The generator of the above embodiment was connected to the apparatus shown in FIG. 6 . The experiment of the above example was repeated with two changes: compressed air was not previously saturated in the sparger tank, but was fed to the wetted zone of the device together with a water flow of 30 l / h. In addition, no cooling circuit is used. Under such conditions, the device was able to generate 200mA / cm in a stable manner 2 The current density; increasing the water flow in the wetting area can also increase the current density in parallel, up to 380mA / cm 2 , at this time the water flow rate is 72l / h. Above this current density level, increasing the water flow had no appreciable effect and the test was terminated due to a sharp drop in the voltage of several of the device's fuel cells.
Embodiment 3
[0041] Repeat the test of Example 3, the only change is that the cooling circuit is put into operation, using 4m 3 / h of demineralized water at a constant flow rate of 50°C. Supply 72l / h of water to the wet area, and maintain 1050mA / cm in 9 hours of continuous operation 2 The stable current density, the average cell voltage is 0.42V, and the minimum single cell voltage is 0.4V.
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