Synergetic effects between Pt and a cheap metal, downshift of the d-band center of Pt and the shape can boost the catalytic performance of Pt-based nanocrystals. Therefore, tailoring the shape and composition within the nanoscale is the key to designing a robust electrocatalyst in electrochemical energy conversion. Here, Cu-rich PtCu octahedral alloys achieved by a composition-driven shape evolution route have been used as outstanding bifunctional electrocatalysts for both methanol oxidation (MOR) and oxygen reduction reaction (ORR) in an acid medium. When benchmarked against commercial Pt black or Pt/C, for MOR, the specific activity/mass activity on Pt_34.5Cu_65.5 octahedra is 4.74/7.53 times higher than that on commercial Pt black; for ORR, the specific activity/mass activity on Pt_34.5Cu_65.5 octahedra is 7.7/4.2 times higher than that on commercial Pt/C. After a current–time test for 3600 s, the remaining mass activity on Pt_34.5Cu_65.5 octahedra is 35.5 times higher than that on commercial Pt black for MOR. After undergoing 5000 cycles for ORR, the remaining mass activity on Pt_34.5Cu_65.5 octahedra is 4.2 times higher than that on commercial Pt/C.

中文翻译：

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成分驱动的形状演变为富含铜的PtCu八面体合金纳米晶体，是用于甲醇氧化和氧还原反应的高级双功能催化剂†

Pt与廉价金属之间的协同效应，Pt d波段中心的下移和形状可以提高Pt基纳米晶体的催化性能。因此，在纳米尺度内调整形状和组成是设计电化学能量转化中坚固的电催化剂的关键。在这里，通过组分驱动的形状演化途径获得的富铜PtCu八面体合金已用作出色的双功能电催化剂，用于酸性介质中的甲醇氧化（MOR）和氧还原反应（ORR）。以MOR为基准，以商品Pt黑或Pt / C为基准，Pt _34.5 Cu _65.5八面体的比活/质量活度比商品Pt黑高4.74 / 7.53倍。对于ORR，Pt上的比活度/质量活度_34.5 Cu _65.5八面体比商用Pt / C高7.7 / 4.2倍。经过3600 s的电流时间测试后，Pt _34.5 Cu _65.5八面体的剩余质量活度比MOR的商业Pt黑的活度高35.5倍。经过5000次ORR循环后，Pt _34.5 Cu _65.5八面体上的剩余质量活度是商业Pt / C上的剩余质量活度的4.2倍。