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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
Author(s) -
Wei Xuan,
Zheng Diao,
Zhao Ming,
Chen Hongzhong,
Fan Xun,
Gao Bin,
Gu Long,
Guo Yi,
Qin Jianbin,
Wei Jing,
Zhao Yanli,
Zhang Guangcheng
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006175
Subject(s) - heteroatom , carbonization , materials science , carbon fibers , inorganic chemistry , polyphosphazene , mesoporous material , metal , electrochemistry , nanotechnology , polymer , chemical engineering , polymer chemistry , chemistry , adsorption , catalysis , organic chemistry , composite number , electrode , ring (chemistry) , engineering , composite material
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 m 2 g −1 ). Structural characterization confirmed uniform dispersion of the single atom transition metal sites (i.e., Co‐N 2 P 2 ) 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.