The oxygen reduction reaction (ORR) properties were intensely affected by the facet of electrocatalysts. For example, (111) facet of Pt₃Ni alloy has been proved to have excellent ORR electrocatalytic activity. Therefore, it could be very important to synthesize Pt₃Ni nanocrystals with large proportion of (111) facet. However, most reported Pt₃Ni polyhedron bound by (111) facets were synthesized using capping agents like oleylamine and oleic acid. These organic ligands will hinder the intrinsic ORR performance of catalyst and require tedious process to remove. Here, we report a one-pot synthesis of capping agents free for polyhedron Pt₃Ni alloy nanoparticles on carbon (Pt₃Ni/C) with large proportion of Pt₃Ni (111) facets. The electrocatalysts achieved an enhancement of 224% in mass activity and 8.7-fold specific activity towards ORR in comparison with commercial Pt/C catalyst. The present study provides a simple method for designing highly efficient Pt alloy electrocatalysts.

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氧还原反应（ORR）的性质受到电催化剂方面的强烈影响。例如，已证明Pt ₃ Ni合金的（111）面具有优异的ORR电催化活性。因此，合成具有较大比例的（111）面的Pt ₃ Ni纳米晶体可能非常重要。然而，大多数报道的由（111）面键合的Pt ₃ Ni多面体是使用诸如油胺和油酸等封端剂合成的。这些有机配体将阻碍催化剂的固有ORR性能，并且需要繁琐的过程才能去除。在这里，我们报告了一锅法合成的多面体Pt ₃ Ni合金纳米粒子在碳（Pt ₃ Ni / C）上具有大量Pt的情况下免费获得的封端剂_3个Ni（111）面。与市售Pt / C催化剂相比，该电催化剂的质量活性提高了224％，对ORR的比活性提高了8.7倍。本研究提供了一种设计高效Pt合金电催化剂的简单方法。

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