It has been reported that a Pt‐based concave‐convex structure offers good electrocatalytic activity toward the oxygen reduction reaction (ORR). Herein, we synthesize ternary PtPdCu multicubes with a hierarchical trepanning concave‐convex structure by a facile solvothermal co‐reduction method. By tailoring the elementary composition, the optimal Pt₄₅Pd₃₀Cu₂₅/C catalyst results in a 2.35‐fold increase in ORR mass activity compared to commercial Pt/C and an excellent long‐term stability. Investigation reveals that the performance enhancement mechanism is mainly caused by the Pd and Cu jointly modified electronic structure of Pt, which facilitates the charge transfer rate as well as the increased number of active sites and improved mass transport by the unique porous multicube concave‐convex structure. Both experiment and theoretical calculations reveal that the three‐elements alloy catalyst and the unique structures play a critical role in high catalytic performance, thus offering guidance to design high‐performance electrocatalysts not only toward the ORR for practical applications in low‐temperature fuel cells, but also for other energy conversion systems rendering a universal significance.

中文翻译：

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三元PtPdCu多元立方催化剂对氧还原反应具有高活性和持久性

据报道，基于Pt的凹凸结构对氧还原反应（ORR）具有良好的电催化活性。本文中，我们通过一种简便的溶剂热共还原方法合成了具有分层开裂凹凸结构的三元PtPdCu多立方。通过调整元素组成，最佳Pt ₄₅ Pd ₃₀ Cu ₂₅与商用Pt / C相比，/ C催化剂可导致ORR质量活性提高2.35倍，并具有出色的长期稳定性。研究表明，性能增强机制主要是由Pt和Cu共同修饰的Pt电子结构引起的，该结构通过独特的多孔多立方体凹凸结构促进了电荷转移速率以及活性位点数量的增加和质量传输的改善。 。实验和理论计算均表明，三元素合金催化剂和独特的结构在高催化性能中起着至关重要的作用，因此不仅为面向低温燃料电池的实际应用的ORR设计高性能电催化剂提供了指导，而且对于其他能量转换系统也具有普遍意义。