Constructing Fe/Ni atomic interfaces in Fe-doped Ni(OH)2 with single-phase structures for efficient oxygen evolution,Journal of Materials Chemistry A

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Constructing Fe/Ni atomic interfaces in Fe-doped Ni(OH)2 with single-phase structures for efficient oxygen evolution
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-02-10 , DOI: 10.1039/d3ta00015j
Cheng-Fei Li ₁ , Hai-Bo Tang ₁ , Jia-Wei Zhao ₂ , Gao-Ren Li ₃

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Fe doping is acknowledged as an extremely efficient strategy for enhancing the catalytic performance in oxygen evolution reaction (OER). However, the influence of Fe distribution, except for the concentration, on OER catalysis remains vague. In particular, the key role of Fe/Ni atomic interfaces on the OER catalytic performance is rarely investigated. In this work, the relationship of atomically interfacial Fe and adjacent Ni activity in Fe-doped Ni(OH)₂ with Fe/Ni atomic interfaces is elucidated in detail via theoretical calculations. In this experiment, we innovatively made Fe aggregate locally to design a Ni/Fe atomic interface in a Fe-doped Ni(OH)₂ single-phase crystal structure. Various advanced characterization techniques revealed that the interfacial agglomerated Fe atoms can optimize the adjacent Ni electronic structure and distorted Ni/Fe–O octahedral structure, thereby confirming the obvious catalytic performance enhancement and the superiority of the Ni/Fe atomic interface over the homogeneous Fe distribution in Ni(OH)₂ for OERs. These fabricated Fe-doped-Ni–(OH)₂ with atomic interfaces show remarkable catalytic performance, exhibiting an overpotential of 248 mV at 10 mA cm⁻² with a Fe/Ni atom ratio of 1/10. This work sheds new light on interfaces at an atomic level for the catalytic performance enhancement of OERs.

中文翻译：

在具有单相结构的 Fe 掺杂 Ni(OH)2 中构建 Fe/Ni 原子界面以实现高效析氧

Fe掺杂被认为是提高析氧反应（OER）催化性能的一种极其有效的策略。然而，除浓度外，Fe 分布对 OER 催化的影响仍然模糊。特别是，很少研究 Fe/Ni 原子界面对 OER 催化性能的关键作用。在这项工作中，通过理论计算详细阐明了Fe 掺杂 Ni(OH) _{2中原子界面 Fe 和相邻 Ni 活性与 Fe/Ni 原子界面的关系。}_{在本实验中，我们创新性地使 Fe 局部聚集，以在 Fe 掺杂的 Ni(OH) 2}中设计 Ni/Fe 原子界面单相晶体结构。各种先进的表征技术表明，界面团聚的 Fe 原子可以优化相邻的 Ni 电子结构和扭曲的 Ni/Fe-O 八面体结构，从而证实了明显的催化性能增强和 Ni/Fe 原子界面相对于均匀 Fe 分布的优越性在 Ni(OH) ₂中用于 OER。这些制造的具有原子界面的掺杂 Fe 的 Ni–(OH) _{2显示出卓越的催化性能，在 10 mA cm}^-2下表现出 248 mV 的过电势，Fe/Ni 原子比为 1/10。这项工作为提高 OER 催化性能的原子级界面提供了新的思路。

更新日期：2023-02-10

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