Rational design of Pt-based alloy electrocatalysts with heterostructures and 3D nanoplate morphology remains a great challenge. Herein, we advance a facile wet-chemical synthesis of heterogeneous fcc-Pt/hcp-PtBi thick-edge nanoplates (PtBi NPs) of 3.1 nm in thickness with a tunable edge width range from 3.7 to 7.0 nm. The preferential absorption of Br^– ions and the excessive input of the Pt precursor play the crucial roles in the formation of the PtBi NPs. Owing to the unique structure and the heterogeneous feature, these PtBi NPs exhibited enhanced catalytic activity and stability for the oxidation of formic acid in comparison to commercial Pt/C. The best catalytic performance of Pt₈₅Bi₁₅ NPs demonstrated the existence of the synergistic effect between intermetallic hcp-PtBi and fcc-Pt.

中文翻译：

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具有增强的甲酸氧化活性的异质 fcc-Pt/hcp-PtBi 厚边纳米板

具有异质结构和 3D 纳米片形态的 Pt 基合金电催化剂的合理设计仍然是一个巨大的挑战。在此，我们推进了厚度为 3.1 nm 且边缘宽度可调范围为 3.7 至 7.0 nm的异质fcc -Pt/ hcp -PtBi 厚边纳米板（PtBi NPs）的简便湿化学合成。Br ^-离子的优先吸收和 Pt 前驱体的过量输入在 PtBi NPs 的形成中起着至关重要的作用。由于独特的结构和多相特征，与商业 Pt/C 相比，这些 PtBi NPs 对甲酸的氧化表现出更高的催化活性和稳定性。Pt ₈₅ Bi ₁₅最佳催化性能NPs 证明了金属间化合物hcp -PtBi 和fcc -Pt之间存在协同效应。