Cross-Linked Polyphosphazene Hollow Nanosphere-Derived N/P-Doped Porous Carbon with Single Nonprecious Metal Atoms for the Oxygen Reduction Reaction.,Angewandte Chemie International Edition

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Cross-Linked Polyphosphazene Hollow Nanosphere-Derived N/P-Doped Porous Carbon with Single Nonprecious Metal Atoms for the Oxygen Reduction Reaction.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-06-02 , DOI: 10.1002/anie.202006175
Xuan Wei _{1,

2} , Diao Zheng ₃ , Ming Zhao ₁ , Hongzhong Chen ₂ , Xun Fan ₁ , Bin Gao ₂ , Long Gu ₂ , Yi Guo ₂ , Jianbin Qin ₁ , Jing Wei ₄ , Yanli Zhao ₂ , Guangcheng Zhang ₁

Affiliation

Heteroatom‐doped polymers or carbon nanospheres have attracted broad research interest. However, rational synthesis of these nanospheres with controllable properties is still a great challenge. Herein, we develop a template‐free approach to construct cross‐linked polyphosphazene nanospheres with tunable hollow structures. As comonomers, hexachlorocyclotriphosphazene provides N and P atoms, tannic acid can coordinate with metal ions, and the replaceable third comonomer can endow the materials with various properties. After carbonization, N/P‐doped mesoporous carbon nanospheres were obtained with small particle size (≈50 nm) and high surface area (411.60 m² g⁻¹). Structural characterization confirmed uniform dispersion of the single atom transition metal sites (i.e., Co‐N₂P₂) with N and P dual coordination. Electrochemical measurements and theoretical simulations revealed the oxygen reduction reaction performance. This work provides a solution for fabricating diverse heteroatom‐containing polymer nanospheres and their derived single metal atom doped carbon catalysts.

中文翻译：

具有单个非贵金属原子的交联聚磷腈空心纳米球衍生的N / P掺杂多孔碳用于氧还原反应。

杂原子掺杂的聚合物或碳纳米球引起了广泛的研究兴趣。然而，这些性质可控的纳米球的合理合成仍然是一个巨大的挑战。本文中，我们开发了一种无模板的方法来构建具有可调中空结构的交联聚磷腈纳米球。六氯环三磷腈作为共聚单体可提供N和P原子，单宁酸可与金属离子配位，可取代的第三共聚单体可赋予材料多种性能。碳化后，获得了N / P掺杂的中孔碳纳米球，其粒径小（≈50nm），表面积大（411.60 m ² g ^-1）。结构表征证实了单原子过渡金属位点（即Co-N _2）的均匀分散P ₂）具有N和P双重协调。电化学测量和理论模拟揭示了氧还原反应性能。这项工作为制备各种含杂原子的聚合物纳米球及其衍生的单金属原子掺杂碳催化剂提供了解决方案。

更新日期：2020-08-10

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