A platinum/carbon-based nanocomposite material and its preparation method and application
A technology of carbon-based nano-composite materials, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of limiting the large-scale production of platinum-supported catalysts and failing to meet the needs of large-scale application of fuel cells and other issues, to achieve good industrial prospects, easy access, and improve the effect of dispersion
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Embodiment 1
[0049] Example 1, Pt / CNH nanocomposite material (PCNb-20) and its electrocatalytic performance test
[0050] 1) Ultrasonic disperse CNH in ethylene glycol, dissolve sodium hydroxide in ultrapure water, and mix the two evenly. Add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse for 30 minutes to obtain CNH concentration of 0.5g / L, chloroplatinic acid hexahydrate concentration of 0.392g / L, volume of alcohol and water A suspension with a ratio of 9:1 has a pH ~12.
[0051] 2) Transfer the mixed liquid to the irradiation tube, pass argon gas for 15 minutes to remove the oxygen in the system, and seal the tube mouth 60 Coγ-rays are irradiated at room temperature, and the dose rate is about 25Gymin -1 , The absorbed dose is 25kGy.
[0052] 3) After the irradiation, the sample is filtered through a polypropylene (PP) membrane with a pore size of 0.45 μm. The filtered filter cake is rinsed with ultrapur...
Embodiment 2
[0055] Example 2, Pt / CNH nanocomposite material (PCNb-5) and its electrocatalytic performance test
[0056] Consistent with the preparation method in Example 1, step 1) was changed to: ultrasonically disperse CNH in ethylene glycol, dissolve sodium hydroxide in ultrapure water, and mix the two evenly. Add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse for 30 minutes to obtain CNH concentration of 0.5g / L, chloroplatinic acid hexahydrate concentration of 0.098g / L, volume of alcohol and water A suspension with a ratio of 9:1 has a pH ~12.
[0057] After obtaining the Pt / CNH nanocomposite material in the form of black fluffy powder, the platinum loading in the composite material was measured by ICP-AES and TGA to be 5 wt%, and the sample was named PCNb-5.
[0058] Consistent with the electrocatalytic performance test method in Example 1, the performance of the PEMFC single cell using the PCNb-5 nanoco...
Embodiment 3
[0060] Example 3, Pt / CNH nanocomposite material (PCNa-20) and its electrocatalytic performance test
[0061] Consistent with the preparation method of Example 1, step 1) is changed to: ultrasonically disperse CNH in ethylene glycol, add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse After 30 minutes, a suspension with a CNH concentration of 0.5 g / L and a chloroplatinic acid hexahydrate concentration of 0.392 g / L was obtained, and its pH was ~4.
[0062] After obtaining the Pt / CNH nanocomposite material in the form of black fluffy powder, the platinum loading in the composite material was measured to be 20 wt% by ICP-AES and TGA, and the sample was named PCNa-20.
[0063] 5) Consistent with the electrocatalytic performance test method of Example 1, the performance of the PEMFC single cell using the PCNa-20 nanocomposite material as the electrocatalyst was measured. Platinum loading per unit area is...
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