According to Nørskov d-band theory, the Pt_xY alloy was predicted to be among the most active catalysts for the oxygen reduction reaction (ORR). To achieve the high surface area needed in proton exchange membrane fuel cells, this alloy must be synthesized as a nanophase in a scalable fashion. However, the synthesis of Pt_xY nanoparticles cannot be accomplished with the common chemical methods due to the high oxophilicity of yttrium. Here we present the successful preparation of Pt_xY nanoparticles in one step by laser ablation in liquid of a Pt₃Y target. The formation of Pt_xY nanoparticles was confirmed by TEM, XRD and XPS analyses. The ORR activity was evaluated in 0.1 M HClO₄ revealing superior mass activity (483 A g⁻¹) and specific activity (0.562 mA cm⁻²) to a Pt/C TKK standard.

中文翻译：

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激光烧蚀合成PtxY纳米合金在氧气还原反应火山图中的作用

根据Nørskovd-带理论，Pt _x Y合金被认为是氧还原反应（ORR）活性最高的催化剂之一。为了实现质子交换膜燃料电池所需的高表面积，该合金必须以可扩展的方式合成为纳米相。然而，由于钇的高亲氧性，不能用常规化学方法完成Pt _x Y纳米颗粒的合成。在这里，我们介绍了通过在Pt ₃ Y靶液体中进行激光烧蚀一步一步成功制备Pt _x Y纳米颗粒的方法。通过TEM，XRD和XPS分析证实了Pt _x Y纳米颗粒的形成。在0.1 M HClO _4中评估ORR活性表现出优于Pt / C TKK标准的质量活性（483 A g ^-1）和比活性（0.562 mA cm ^-2）。