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通过磁控溅射技术将Pt和Cu的纳米粒子共沉积于AlOx载体上,制备得到Pt-Cu双金属催化剂。催化剂的Pt/Cu原子比可以通过改变Pt的溅射功率轻松调控。通过扫描电镜、原子力显微镜和X射线光电子能谱对催化剂薄膜的组分、表面形貌和结合能进行表征。结果表明,非贵金属Cu替代Pt/AlOx中部分贵金属Pt可提高其催化活性并降低贵金属Pt的用量。当Pt/Cu原子比为3时,Pt-Cu双金属催化剂在100℃对甲醇燃烧的催化转化率达到95%,与相同条件下转化率为92%的Pt/AlOx催化剂相比,节省了约40%的贵金属Pt用量。催化活性的提升可以归结于Cu的掺杂降低了Pt~04f的结合能。
The Pt-Cu bimetallic catalysts were prepared by co-deposition of Pt and Cu nanoparticles on the AlOx support by magnetron sputtering. The Pt / Cu atomic ratio of the catalyst can be easily regulated by changing the sputtering power of Pt. The composition, surface morphology and binding energy of the catalyst films were characterized by scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. The results showed that the substitution of non-noble metal Cu for Pt, a part of Pt / AlOx, can increase its catalytic activity and decrease the amount of precious metal Pt. When Pt / Cu atomic ratio is 3, the catalytic conversion of Pt-Cu bimetallic catalyst to methanol combustion is 95% at 100 ℃. Compared with Pt / AlOx catalyst with 92% conversion under the same conditions, 40% of the amount of precious metal Pt. The improvement of catalytic activity can be attributed to the fact that the doping of Cu decreases the binding energy of Pt ~ 04f.