Correlation between catalytic activities and internal atomic structure of baimetallic nanoparticles containing platinum

我们开发了一种新的一锅法制备双金属纳米粒子的方法，该方法含有Pt和M （Ru, Cu, Co, Ni， Sn等），纳米尺寸为几纳米，负载在陶瓷或碳颗粒上。用加速电子束辐照含两种金属离子和载体粒子的水溶液。水的放射性分解产生的自由基使这些离子还原，形成稳定在载体上的金属纳米粒子。由于还原过程迅速，合金纳米颗粒可以克服两种元素之间的氧化还原电位差。双金属结构从核-壳到合金各不相同。贱金属以氧化物的形式析出，但很少贱金属同时形成合金和氧化物，结构更为复杂。我们检测了样品的结构和催化活性，以证明它们作为催化剂的优势。

We developed a new one-pot method for producing bimetallic nanoparticles containing Pt and M (Ru, Cu, Co, Ni, Sn etc.) of a few nm supported on ceramics or carbon particles. Aqueous solution containing ions of two metals and support particles was irradiated with an accelerated electron beam. Radicals generated from the water radiolysis reduce these ions to form metallic nanoparticles stabilized on the support. Since the reduction proceeds quickly, alloy nanoparticles may be produced overcoming the redox potential gap between the two elements. The bimetallic structure varied from core-shell to alloy. Base metal precipitates as oxide, but less base metal formed both of alloy and oxide, giving more complex structures. We examined structures and evaluated catalytic activities of the samples to demonstrate their advantages as the catalysis.