Abstract Bimetallic platinum-cobalt (Pt–Co) nanostructure catalysts represent superior catalytic performances for oxygen reduction reaction (ORR). In a variety of Pt–Co catalyst structures, atomically ordered structure catalysts show excellent catalytic performances in the ORR. In this work, for promoting their catalytic performances, atomically ordered PtCo nanoparticles (PtCo/C) with carbon supported were successfully prepared by an improved impregnation method and annealing. Then, the ordered PtCo/C catalysts have been significantly improved by doped with ultralow amount of Au and Cr transition metal. The physical and electrochemical test results demonstrate the Cr–PtCo/C and Au–PtCo/C catalysts have superior catalytic performances including mass activity and stability compared to commercialized Johnson Matthey (JM) Pt/C, which was the result of the modified electronic properties of Pt surface and atomically ordered structure. The presence of Au and Cr enhances the stability of PtCo/C catalysts. This work represents a simple way to promote the catalytic performances of the atomically ordered catalysts.

中文翻译：

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铂基原子有序纳米粒子的表面改性以提高氧还原反应的催化性能

摘要 双金属铂钴 (Pt-Co) 纳米结构催化剂对氧还原反应 (ORR) 具有优异的催化性能。在各种 Pt-Co 催化剂结构中，原子有序结构的催化剂在 ORR 中表现出优异的催化性能。在这项工作中，为了提高其催化性能，通过改进的浸渍方法和退火方法成功制备了碳负载的原子有序 PtCo 纳米粒子 (PtCo/C)。然后，通过掺杂超低量的 Au 和 Cr 过渡金属，有序 PtCo/C 催化剂得到了显着改善。物理和电化学测试结果表明，与商业化的庄信万丰 (JM) Pt/C 相比，Cr-PtCo/C 和 Au-PtCo/C 催化剂具有优异的催化性能，包括质量活性和稳定性，这是 Pt 表面和原子有序结构改变电子特性的结果。Au和Cr的存在增强了PtCo/C催化剂的稳定性。这项工作代表了一种提高原子有序催化剂催化性能的简单方法。