Atomistic Insight into the Redox Reactions in Fe/Oxide Core–Shell Nanoparticles,Chemistry of Materials

当前位置： X-MOL 学术 › Chem. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Atomistic Insight into the Redox Reactions in Fe/Oxide Core–Shell Nanoparticles
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-09-24 00:00:00 , DOI: 10.1021/acs.chemmater.8b03679
Shuang Meng ₁ , Jiangbing Wu ₁ , Ligong Zhao ₁ , He Zheng ₁ , Shuangfeng Jia ₁ , Shuaishuai Hu ₁ , Weiwei Meng ₁ , Shizhou Pu ₁ , Dongshan Zhao ₁ , Jianbo Wang _{1,

2}

Affiliation

Modern technological pressure for property-directing structural design of Fe/oxide core–shell nanoparticles (NPs) requires the basic understanding of the formation mechanisms and the ability to effectively tune the structures. In this work, in-depth transmission electron microscopy characterization reveals the formation of an Fe/Fe₃O₄ core–shell structure when iron NPs were oxidized at room temperature. More importantly, we present the first atomically resolved dynamical images showing the redox reactions in Fe/oxide NPs at high temperature (400–600 °C). The real-time videos show the unambiguous evidence of the reduction and incorporation of oxygen species along the specific interfaces, leading to the reduction of Fe₃O₄ to FeO and oxidation of Fe to Fe₃O₄, which are further investigated based on the theoretical calculations. Meanwhile, it is found that the passive Fe₃O₄ shell may provide the oxygen ions for the further oxidation of the Fe core at high temperature. These findings contribute to a comprehensive scenario for the structural evolution in metal/oxide nanostructures for improved device design and modeling.

中文翻译：

铁/氧化物核-壳纳米粒子中氧化还原反应的原子学洞察

Fe /氧化物核壳纳米粒子（NPs）的性能指导结构设计的现代技术压力要求对形成机理和有效调整结构的能力有基本的了解。在这项工作中，深入的透射电子显微镜表征揭示了当铁NP在室温下被氧化时，Fe / Fe ₃ O ₄核-壳结构的形成。更重要的是，我们展示了第一个原子分辨的动力学图像，显示了高温（400–600°C）下铁/氧化物纳米颗粒中的氧化还原反应。实时视频显示了明确的证据，表明沿着特定界面减少和吸收了氧，从而减少了Fe ₃ O ₄的含量。FeO氧化和Fe氧化为Fe ₃ O ₄，这是在理论计算的基础上进一步研究的。同时，发现被动的Fe ₃ O ₄壳可以提供氧离子以在高温下进一步氧化Fe核。这些发现有助于为金属/氧化物纳米结构的结构演变提供全面的方案，以改善器件设计和建模。

更新日期：2018-09-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11