Ultrasonic spraying method for preparing porous catalyst layer of fuel cell membrane electrode
A fuel cell membrane, ultrasonic spraying technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., to achieve a wide range of applications, high electrochemical performance, and production cost savings.
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Embodiment 1
[0058] Specifically, after spraying 25cm 2 In the cathode catalytic layer process of the size, the platinum carbon catalyst used is the PtCo / C (60wt%) of commercially available high surface carbon loading, and the solvent used is water, isopropanol and glycerol, and the mass ratio of four is 1: 50:245:5, the solid content of the catalyst slurry is 0.33wt%; the polymer additive used is Nafion D520, which is diluted to 1wt% with isopropanol; the pore-forming agent used is ammonium carbonate, the solvent is water, and the pores are formed The solid content of the agent is 2wt%.
[0059] When spraying, the base temperature is set at 120°C, and the flow rate of the catalyst slurry flow path is set at a constant 0.48mL min -1 , spraying time is 10min, platinum loading is 0.3mg cm -2 (Consider spray loss). The flow rate of the polymer additive solution flow path is initially set to 1.2mL min -1 , and according to 0.2mL min -1 The rate decreases until a total of 6.0mL of material...
Embodiment 2
[0061] 25cm in spray 2 In the cathode catalytic layer process of the size, the platinum-carbon catalyst used is Pt / C (20wt%) produced by Johnson Matthey, the solvent used is water and ethanol, and the mass ratio of the three is 1:70:230, and the catalyst slurry The solid content of the material is 1.0wt%. The high polymer additive used is Nafion D520, which is diluted to 2wt% with isopropanol. The pore-forming agent used is ammonium bicarbonate, the solvent is a compound of water and ethanol 1:0.2, and the solid content of the pore-forming agent is 1 wt%.
[0062] When spraying, the base temperature is set at 100°C, and the flow rate of the catalyst slurry flow path is set at a constant 0.48mL min -1 , spraying time is 10min, platinum loading is 0.3mg cm -2 (Consider spray loss). The flow rate of the polymer additive solution flow path is initially set to 1.2mL min -1 , and according to 0.2mL min -1 The rate decreases until a total of 6.0mL of material is sprayed, with a...
Embodiment 3
[0064] 25cm in spray 2 In the cathode catalytic layer process of the size, the platinum-carbon catalyst used is PtRu / C (20wt%, anode) and Pt / C (20wt%, cathode), and the solvent used is water and glycerin, and the mass ratio of the three is 1 :70:230, the solid content of the catalyst slurry is 1.0wt%. The polymer additives used are D83, diluted to 1.25wt% with ethanol. The pore-forming agent used is ammonium bicarbonate, the solvent is a compound of water and isopropanol (1:0.2), and the solid content of the pore-forming agent is 1.25 wt%.
[0065] During spraying, the base temperature is set at 110°C, and the flow rate of the catalyst slurry flow path is set at a constant 0.32mL min -1 , spraying time is 15min, platinum loading is 0.3mg cm -2 (Consider spray loss). The flow rate of the polymer additive solution flow path is initially set to 2mL min -1 , and according to 0.1mL min -1 The rate decreases until a total of 12mL of material is sprayed, the minimum rate is 0...
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