Pt-based electrocatalysts are by far the most effective for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), but they still suffer from high cost and insufficient overall performance. Improving Pt utilization via alloying or by forming [email protected] structures is important for enhancing Pt activity and overall electrocatalytic performance. Herein, we report a simple seed-mediated method for synthesizing a dodecahedral PtCu alloy atomic shell on Pd nanocrystals. Significantly, such a [email protected] nanocomposite with unique [email protected] structure achieves a 25-fold and 6-fold enhancement of mass activity for HER and ORR, respectively, compared with the commercial Pt/C catalyst in acid media. Moreover, the unique [email protected] catalyst shows only 1.0 mV increase in overpotential at 10 mA cm^–2 after 10 000 cycles for HER and almost no activity decay after 5 000 cycles for ORR, indicating the high endurance of [email protected] in the electrochemical environment.

中文翻译：

---

Pd纳米晶体上PtCu合金壳的表面析出导致优异的氢析出和氧还原反应

迄今为止，基于Pt的电催化剂对于放氢反应（HER）和氧还原反应（ORR）最有效，但是它们仍然遭受高成本和整体性能不足的困扰。通过合金化或通过形成[受电子邮件保护的]结构来提高Pt利用率对于增强Pt活性和整体电催化性能至关重要。在本文中，我们报告了一种在Pd纳米晶体上合成十二面体PtCu合金原子壳的简单种子介导方法。值得注意的是，与酸性介质中的商用Pt / C催化剂相比，这种具有独特[受电子邮件保护]结构的[受电子邮件保护]纳米复合材料的HER和ORR质量活性分别提高了25倍和6倍。此外，独特的[受电子邮件保护的]催化剂在10 mA cm处的过电势仅增加1.0 mVHER进行10 000次循环后为^–2，ORR进行5000次循环后几乎没有活性下降，这表明在电化学环境中，[电子邮件保护]具有很高的耐久性。