氧原子迁移主导了钌纳米片的异常可逆氧化，这一成果由天津工业大学化学化工学院安长华研究小组经过不懈努力而取得。相关论文于2025年3月31日发表于国际顶尖学术期刊《德国应用化学》杂志上。

氧化是自然界中普遍存在的反应。对于大多数金属（特别是金属纳米颗粒），在适当的条件下，它们会被完全氧化，但钌（Ru）除外。本文采用原位透射电镜（原位TEM）和非原位光谱技术研究了钌纳米片的氧化过程。非原位光谱分析证实了Ru纳米片不完全氧化成RuO而原位TEM观察发现，氧化过程中存在异常的由氧化相向金属相的反向相变。结合理论计算，氧原子迁移主导了可逆氧化过程，与传统金属体系的单向氧化途径明显不同。通过可逆氧化生成丰富的Ru-RuO2异质界面，为电化学碱性析氢反应（HER）提供了丰富的活性位点。

本研究不仅为理解复杂的动态氧化过程奠定了基础，而且为纳米催化剂的设计提供了新的思路。

附：英文原文

Title: Oxygen Atom Migration Dominates Anomalous Reversible Oxidation of Ru Nanosheets

Author: Xiong Xiao, Yongli Shen, Wei Xi, Lin Gu, Xiaogang Li, Baojuan Xi, Shenglin Xiong, Changhua An

Issue&Volume: 2025-03-31

Abstract: Oxidation is a ubiquitous reaction in nature. For most metals (especially metal nanoparticles), they will be completely oxidized under suitable conditions, except ruthenium (Ru). In this work, in-situ transmission electron microscopy (in-situ TEM) and ex-situ spectroscopy were employed to investigate the oxidation process of Ru nanosheets.  Ex-situ spectroscopic analysis demonstrates the incomplete oxidation of Ru nanosheets to RuO, while the in-situ TEM observations uncover an anomalous reverse phase transformation from the oxidized to metallic phase during oxidation. Combined with theoretical calculations, the oxygen atom migration dominates the reversible oxidation process, strikingly distinct from the unidirectional oxidation pathways in conventional metallic systems. The as-generated abundant Ru-RuO2 heterointerfaces formed through reversible oxidation provide a wealth of active sites for electrochemical alkaline hydrogen evolution reaction (HER). Herein, the study not only lays a foundation for the understanding complex dynamic oxidation processes, but also offers new insights into for the design of nanocatalysts.

DOI: 10.1002/anie.202502927

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202502927