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采用溶胶凝胶法制备了碳载纳米双金属Ni-Pt(5%,质量分数)/C电催化剂,用TEM、XRD和XPS表征金属粒子的形貌、晶相结构、表面元素及其价态,循环伏安法测试催化剂在碱性溶液中电催化氧化甲醇的活性。结果表明,Ni-Pt金属粒子在碳载体上分布均匀,粒径为3～6nm,少量Pt的掺杂对纳米Ni活性有明显提高,其中,合金型Ni-Pt(5%)/C在1.0mol/LNaOH+1.0mol/LCH3OH溶液中峰电流密度可达85.6mA/mg,是Ni/C峰电流密度的8.7倍,达到Pt/C峰电流密度的15.3%。单位质量铂的电流显著提高。
The nanocrystalline Ni-Pt (5%, mass fraction) / C electrocatalyst was prepared by sol-gel method. The morphology, crystal structure, surface element and valence of the metal particles were characterized by TEM, XRD and XPS. Cyclic voltammetry was used to measure the electrocatalytic oxidation of methanol in alkaline solution. The results show that the Ni-Pt metal particles are uniformly distributed on the carbon support with a particle size of 3 to 6 nm. The addition of a small amount of Pt significantly increases the activity of the Ni nanoparticle. The Ni-Pt alloy (5%) / The peak current density reached 85.6mA / mg in mol / LNaOH + 1.0mol / L CH3OH solution, which was 8.7 times of the peak current density of Ni / C and reached 15.3% of the peak current density of Pt / C. The current per unit mass of platinum is significantly increased.