Tailoring the composition and morphology of Pt-based catalysts is an effective approach for achieving both reduction in Pt usage and improvement in electrocatalytic performance. Herein, we develop a facile one-pot method for the direct preparation of PtPdCu hexapod concave rhombic dodecahedrons (HCRDs). The well-defined PtPdCu HCRDs possess excavated structure and six site-selective arms, which are preferentially located at six {100} vertexes of a central excavated rhombic dodecahedron and covered with high-index facets. Regulating the addition of Br ions could alter the morphology of nanocrystals easily due to different etching degrees and selective overgrowth. Introducing specific amounts of Pd contributes to the excellent electrocatalytic activity and stability of PtPdCu HCRDs catalyst for both oxygen reduction and methanol oxidation reaction compared to commercial Pt/C. This work provides a simple strategy for rationally designing trimetallic electrocatalysts with controlled morphology and enhanced catalytic performance.

中文翻译：

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一锅法制备定点六足体PtPdCu凹形菱形十二​​面体作为高效电催化催化剂

调整Pt基催化剂的组成和形态是实现减少Pt用量和改善电催化性能的有效方法。在这里，我们开发了一种简便的一锅法，用于直接制备PtPdCu六足凹凹菱形十二面体（HCRD）。定义明确的PtPdCu HCRD具有挖掘的结构和六个位置选择臂，它们优先位于中央挖掘的菱形十二面体的六个{100}顶点处，并覆盖有高折射率的小平面。由于蚀刻程度和选择性过度生长，调节Br离子的添加​​很容易改变纳米晶体的形貌。与商业化的Pt / C相比，引入特定量的Pd有助于PtPdCu HCRDs催化剂在氧还原和甲醇氧化反应方面的出色的电催化活性和稳定性。这项工作为合理设计具有可控形态和增强催化性能的三金属电催化剂提供了一种简单的策略。