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以碳粉(VulcanXC-72R)和碳纳米管为载体,通过浸渍-还原法分别制备出了Pt及Pt-Co合金催化剂用于NaBH4-H2O2燃料电池的阴极H2O2还原。利用XRD技术对催化剂的晶体结构进行表征,并对催化剂进行了循环伏安、线性扫描伏安测试。结果表明:纯Pth和Pt-Co合金均为面心立方结构,Co的引入可有效提高催化剂的活性;相对于纯Pt催化剂,Pt-Co合金的催化活性受载体的影响较大。无论以碳粉还是碳纳米管为载体,Pt10%-Co15%的Pt-Co合金催化剂峰电流最大,峰电位最高,催化性能最好。
The Pt and Pt-Co alloy catalysts were prepared by impregnation-reduction method for the H2O2 reduction of NaBH4-H2O2 fuel cells using carbon powder (VulcanXC-72R) and carbon nanotubes as carriers. The XRD technique was used to characterize the crystal structure of the catalyst. Cyclic voltammetry and linear sweep voltammetry measurements were carried out on the catalyst. The results show that the pure Pth and Pt-Co alloys are all face-centered cubic. The introduction of Co can effectively increase the activity of the catalyst. The catalytic activity of the Pt-Co alloy is more affected by the carrier than the pure Pt catalyst. Pt-Co15% Pt-Co alloy exhibited the highest peak current and the highest peak potential, with the best catalytic performance, both with carbon powder and with carbon nanotubes as carrier.