Incorporating Pt with core metals into Pt-based core-shell catalysts is regarded as a promising strategy to substantially enhance the catalytic properties towards oxygen reduction reaction (ORR) in fuel cells due to the synergetic effect between distinct metals. In this wok, ultrathin Pt skins with two atomic layers were epitaxially coated on as-prepared icosahedral Au₅₀Pd₅₀, Au₆₀Pd₄₀ and Au₆₆Pd₃₄ nanocrystal seeds, which are constructed with alloyed cores and Pd shells with different thickness. Through electron microscopic characterizations, Pd interlayers with tunable thickness of 3, 6, and 12 atomic layers can be found in the Au₆₆Pd₃₄@Pt, Au₆₀Pd₄₀@Pt and Au₅₀Pd₅₀@Pt icosahedra, respectively. These icosahedral [email protected]@Pt nanocrystals show substantially enhanced activities and durabilities in electrocatalytic measurements towards ORR compared to Au₇₅Pd₂₅@Pt icosahedra without Pd interlayer and commercial Pt/C catalysts. Specifically, Au₆₀Pd₄₀@Pt icosahedra with 6 atomically thick Pd interlayer display the best electrocatalytic performances, whose mass activities before and after durability tests of 50,000 cycles are 11.6 and 30.2 times, respectively, as high as that of the commercial Pt/C.

由于不同金属之间的协同作用，将 Pt 与核金属结合到 Pt 基核壳催化剂中被认为是一种有前途的策略，可以显着提高燃料电池中氧还原反应 (ORR) 的催化性能。在这个炒锅中，将具有两个原子层的超薄 Pt 皮层外延涂覆在由不同厚度的合金核和 Pd 壳构成的二十面体 Au ₅₀ Pd ₅₀、Au ₆₀ Pd ₄₀和 Au ₆₆ Pd _{34纳米晶种上。}通过电子显微镜表征，可以在 Au ₆₆ Pd _{34中找到厚度可调的 3、6 和 12 个原子层的 Pd 中间层}@Pt、Au ₆₀ Pd ₄₀ @Pt 和 Au ₅₀ Pd ₅₀ @Pt 分别为二十面体。_{与没有 Pd 中间层的 Au 75} Pd ₂₅ @Pt 二十面体和商业 Pt/C 催化剂相比，这些二十面体 [电子邮件保护]@Pt 纳米晶体在 ORR 电催化测量中显示出显着增强的活性和耐久性。具体而言，具有6个原子厚度Pd中间层的Au ₆₀ Pd ₄₀ @Pt二十面体显示出最佳电催化性能，其50,000次循环耐久性测试前后的质量活性分别是商业Pt/C的11.6和30.2倍.