Membrane electrode for improving anode water management of proton exchange membrane fuel cell
A proton exchange membrane and fuel cell technology, applied in fuel cells, battery electrodes, fuel cell additives, etc., can solve problems such as lower energy conversion efficiency and lower hydrogen utilization rate, and achieve lower ohmic resistance, relieve pressure, and increase resistance. The effect of water power
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[0023] Example 1
[0024] In Example 1, the proton exchange membrane was prepared by casting Nafion solution to form a membrane. First, a layer of Nafion solution was poured on a flat glass plate. After drying to form a membrane, the membrane on the cathode side was formed (the membrane thickness was about 25%). Micrometers), and then cast a layer containing 5wt.% S-SiO on its surface 2 Nafion solution is dried to form a film on the anode side (the film thickness is about 25 microns).
[0025] After the film is completely dry, spray the surface of the anode side film with a loading amount of 50wt.% Pt / C, Nafion, S-SiO 2 , Catalyst slurry composed of isopropanol (Pt / C, Nafion, S-SiO 2 The weight ratio of isopropanol is 3:1:0.2:10), and finally a catalytic layer (containing sulfonated SiO 2 About 5wt.%). Then spray the catalyst slurry composed of Pt / C, Nafion, and isopropanol on the surface of the cathode side membrane (the weight ratio of Pt / C, Nafion, and isopropanol is 3:1:10) to ...
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[0033] Example 2
[0034] In Example 2, a layer of S-SiO with a thickness of about 20 microns containing 2 wt.% was sprayed on the surface of the Nafion 211 proton exchange membrane 2 Nafion layer (i.e. S-SiO 2 Accounted for S-SiO 2 2wt.% of the total weight of Nafion), forming an improved composite structure proton exchange membrane, and will contain S-SiO 2 One side is the anode side.
[0035] The catalyst slurry is sprayed on the anode side surface of the above-mentioned membrane, which is composed of 60wt.% Pt / C, Nafion, S-SiO 2 , Isopropanol composition (Pt / C, Nafion, S-SiO 2 , The mass ratio of isopropanol is: 3:1:0.08:10), and S-SiO 2 The content is about 2wt.%. The cathode side is sprayed without SiO 2 The catalyst slurry (the mass ratio of Pt / C, Nafion, and isopropanol is 3:1:10).
[0036] Brush the anode microporous layer slurry (nano graphite powder, PTFE, water, alcohol, ammonium carbonate, the ratio is 58:40:60:400:2) on the surface of the carbon paper that has been hydr...
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[0043] Example 3:
[0044] The difference from Example 2 is that the prepared proton exchange membrane anode side sulfonated SiO 2 The content is 10wt.% (ie S-SiO 2 Accounted for S-SiO 2 10wt.% of the total weight of Nafion); the anode side catalyst layer contains sulfonated SiO 2 The content is about 10wt.% (Pt / C, Nafion, S-SiO 2 The mass ratio is: 3:1:0.44); the PTFE content of the microporous layer on the anode side is 50wt.%, and the ammonium oxalate is 10wt.% (nano graphite powder, PTFE, ammonium carbonate, the ratio is 4:5:1). Compare the performance of the membrane electrode in Example 3 with that of the ordinary membrane electrode, such as Figure 4 As shown, the performance of the adjusted membrane electrode did not deteriorate.
[0045] The change of anode water output was also investigated, and the anode "dead end" model was adopted, that is, anode zero gas discharge, and the water output from the anode outlet was observed. After running the battery for 1 hour, no obvio...
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