Proton exchange membrane fuel cell self-humidifying membrane electrode and preparation method thereof
A proton exchange membrane and fuel cell technology, applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., can solve the problems of reduced electrochemical active area of catalysts, increased battery resistance, etc., to solve the problem of reduced electrochemical active area of catalysts Small, increase performance, solve the effect of increasing battery resistance
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Embodiment 1
[0023] Embodiment 1: with 40wt%Pt / C (Johnson Matthey), 5wt% the solution Nano-TiO 2 (21nm) and isopropanol were mixed to form anode catalyst slurry, which was dispersed uniformly by ultrasonic for 40min, and then sprayed onto Nafion212 On the upper side of the membrane, 40wt%Pt / C (Johnson Matthey), 5wt% the solution Mix it with isopropanol 5g to form a cathode catalyst slurry, disperse evenly after ultrasonication for 40 minutes, and spray it on the other side of the Nafion212 membrane to make a thin-layer film-coated electrode CCMs, in which nano-particles TiO in the anode catalyst layer 2 The contents are 0%, 10% and 40% (relative to the mass ratio of Pt / C). The anode side contains 10% TiO 2 The CCMs were placed under a UV lamp with a wavelength of 350nm for 1h (such as figure 1 shown), the distance between the light source 1 and the sample 2 is adjusted to 8cm by the bracket 3 (indicated by the scale 4). Fix the self-made CCMs on the glass plate with the anode s...
Embodiment 2
[0024] Embodiment 2: with 40wt%Pt / C (Johnson Matthey), 5wt% the solution 20% Nano TiO 2 (21nm, relative to the mass ratio of Pt / C) and 6g of isopropanol are mixed to form an anode catalyst slurry, which is ultrasonically dispersed for 40min and then sprayed onto Nafion212 On the membrane side, the preparation method of the cathode catalytic layer is the same as in Example 1, and thin-layer film-coated electrodes CCMs are made. The self-made CCM was subjected to ultraviolet light treatment, and the method and conditions were the same as in Example 1. And carry out contact angle experiment test to it, test method is the same as embodiment 1. Then the self-made CCMs and gas diffusion layer were hot-pressed at 140 °C and 0.15 MPa for 2 min to obtain an asymmetric membrane electrode (MEA). The effective active area of MEA is 5cm 2 , and assembled it into a battery for performance evaluation under low humidification conditions. Found to contain 20% TiO 2 The contact angl...
Embodiment 3
[0025] Example 3: The preparation method of the anode catalytic layer and the cathode catalytic layer is the same as that of Example 2, and thin-layer film-coated electrodes CCMs are made. The self-made CCM was subjected to ultraviolet light treatment, and the method and conditions were the same as in Example 1. And carry out contact angle experiment test to it, test method is the same as embodiment 1. Place the UV-treated CCM in N 2 After 2000 minutes in the environment, the contact angle test was carried out. From Figure 4 It can be seen that at N 2 Under the environment, the contact angle is basically unchanged before and after 2000min. So after N 2 From the environmental test, it can be inferred that the hydrophilicity induced by ultraviolet light will remain unchanged in the battery anode environment.
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