Low-Pt based nanocrystals demonstrate potential as highly active catalysts for the oxygen reduction reaction (ORR), but they suffer from undesirable structural degradation. Therefore, it is highly challenging to optimize their surface and interfacial structures to tune their catalytic properties for both activity and stability. Here core–shell Cu/FePtCu nanoparticles with a face-centered-tetragonal phase are prepared by a facile one–pot polyol method at 320 °C. The optimized core–shell Fe₄₅Pt₃₅Cu₂₀ catalyst with Pt-enriched surface exhibits 0.5 A/mg_Pt mass activity, which is a factor of 4 better than that of commercial Pt/C (0.13 A/mg_Pt). In addition, the current density of the catalyst drops only 3.0% after 1000 cycles, which is much better than Pt/C (34.2% decay). Using aberration-corrected scanning transmission electron microscopy and atomically resolved elemental mapping, the morphology and structure evolving between the FePtCu alloy and core–shell Cu/FePtCu could clearly be explained. This work demonstrates that an ordered and core–shell FePtCu catalyst is highly promising for ORR and other electrochemical processes.

低铂基纳米晶体显示出作为氧还原反应（ORR）的高活性催化剂的潜力，但它们遭受不良的结构降解。因此，优化它们的表面和界面结构以调节其催化性能以获得活性和稳定性都极具挑战性。在这里，通过简便的一锅多元醇法在320°C下制备具有面心四方相的核-壳Cu / FePtCu纳米颗粒。优化的具有富Pt表面的核-壳Fe ₄₅ Pt ₃₅ Cu ₂₀催化剂表现出0.5 A / mg _Pt的质量活性，比市售Pt / C（0.13 A / mg _Pt）高出4倍。）。此外，催化剂的电流密度在1000次循环后仅下降了3.0％，远好于Pt / C（衰减34.2％）。使用像差校正的扫描透射电子显微镜和原子分辨元素图谱，可以清楚地解释FePtCu合金与核-壳型Cu / FePtCu之间的形貌和结构。这项工作表明，有序的核壳型FePtCu催化剂在ORR和其他电化学过程中非常有前途。