Membrane electrode assembly for improving performance of integrated regenerative fuel cell and preparation method thereof
A membrane electrode assembly and fuel cell technology, which is applied to fuel cell components, fuel cells, electrical components, etc., can solve problems such as poor cycle performance, achieve high porosity, avoid rapid corrosion, and improve stability
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Embodiment 1
[0029] Mix Pt / C and Nafion with ethanol aqueous solution to prepare hydrogen side catalytic layer slurry; pre-mix Pt black and polytetrafluoroethylene emulsion after high temperature sintering, and then mix with ethylene dioxide, Nafion and ethanol aqueous solution to prepare oxygen side catalytic layer Then spread the perfluorosulfonic acid proton exchange membrane on the vacuum chuck with heating function, and use the ultrasonic nozzle to coat the hydrogen and oxygen side catalytic layer slurry on both sides of the membrane respectively.
[0030] The preparation of the diffusion layer on the oxygen side is to immerse the single-layer titanium mesh into the polytetrafluoroethylene emulsion, take it out and dry it after immersing for 2-3 hours, then put it into a high-temperature furnace, and heat-treat it at 280-350°C for 0.5-1 hour in a nitrogen atmosphere ; Then mix the titanium dioxide and nano-scale titanium dioxide with the aqueous ethanol solution evenly, and coat it on ...
Embodiment 2
[0034] The preparation process of the double-effect membrane electrode is as described in Example 1.
[0035] The preparation process of the diffusion layer on the oxygen side is similar to that described in Example 1, except that the base material is multi-layer sintered titanium mesh, and the conductive agent is nano-scale titanium powder.
[0036] The preparation process of the hydrogen side diffusion layer and the molding process of the membrane electrode assembly are as described in Example 1.
Embodiment 3
[0038] The membrane electrode assembly in embodiment 1 or embodiment 2 is assembled in the integrated regeneration fuel cell, carries out polarization characteristic curve and cycle performance curve test, such as image 3 with Figure 4 shown.
[0039] The test conditions of the polarization characteristic curve are: fuel cell mode: hydrogen-oxygen inlet gauge pressure 0.2MPa; hydrogen-oxygen humidification temperature 80°C, battery temperature 65-70°C; water electrolysis mode: water inlet gauge pressure 0.1MPa, battery temperature 65°C ~70°C. The result is as image 3 shown. When the integrated regenerative fuel cell works in fuel cell mode, the current density is 600mA·cm -2 Under normal conditions, the working voltage is 0.723V; when working in water electrolysis mode, the current density is 1000mA cm -2 Under these conditions, the working voltage is 1.706V.
[0040] The cycle performance test is at 600mA·cm -2 Under the conditions, the FC / WE mode is switched repeat...
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