Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 34, Pages 14639-14646Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202006175
Keywords
electrocatalysis; hollow porous nanospheres; oxygen reduction reaction; polyphosphazene; single atom catalysts
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Funding
- National Natural Science Foundation of China [51773170, 21701130]
- Singapore National Research Foundation Investigatorship [NRF-NRFI2018-03]
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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 (approximate to 50 nm) and high surface area (411.60 m(2) 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.
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