Phase transformation offers an alternative strategy for the synthesis of nanomaterials with unconventional phases, allowing us to further explore their unique properties and promising applications. Herein, we first observed the amorphization of Pt nanoparticles on the RuO₂ surface by in situ scanning transmission electron microscopy. Density functional theory calculations demonstrate the low energy barrier and thermodynamic driving force for Pt atoms transferring from the Pt cluster to the RuO₂ surface to form amorphous Pt. Remarkably, the as-synthesized amorphous Pt/RuO₂ exhibits 14.2 times enhanced mass activity compared to commercial RuO₂ catalysts for the oxygen evolution reaction (OER). Water electrolyzer with amorphous Pt/RuO₂ achieves 1.0 A cm^–2 at 1.70 V and remains stable at 200 mA cm^–2 for over 80 h. The amorphous Pt layer not only optimized the *O binding but also enhanced the antioxidation ability of amorphous Pt/RuO₂, thereby boosting the activity and stability for the OER.

中文翻译：

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Ru 氧化物促进酸性析氧的表面扩散诱导 Pt 纳米粒子非晶化

相变为合成具有非常规相的纳米材料提供了一种替代策略，使我们能够进一步探索其独特的性能和有前景的应用。在此，我们首先通过原位扫描透射电子显微镜观察了RuO _{2表面Pt纳米粒子的非晶化。密度泛函理论计算证明了Pt原子从Pt团簇转移到RuO 2}表面形成非晶态Pt的低能垒和热力学驱动力。值得注意的是，与商用RuO ₂催化剂相比，所合成的无定形Pt/RuO ₂在析氧反应(OER)中的质量活性提高了14.2倍。采用非晶态 Pt/RuO ₂的水电解槽在 1.70 V 下可达到 1.0 A cm ^{–2电流，并在 200 mA cm –2}下保持稳定超过 80 小时。非晶态Pt层不仅优化了*O结合，还增强了非晶态Pt/RuO ₂的抗氧化能力，从而提高了OER的活性和稳定性。