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Controllable Construction of Core–Shell Polymer@Zeolitic Imidazolate Frameworks Fiber Derived Heteroatom‐Doped Carbon Nanofiber Network for Efficient Oxygen Electrocatalysis
Author(s) -
Zhao Yingxuan,
Lai Qingxue,
Zhu Junjie,
Zhong Jia,
Tang Zeming,
Luo Yan,
Liang Yanyu
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201704207
Subject(s) - bifunctional , electrocatalyst , heteroatom , oxygen evolution , materials science , zeolitic imidazolate framework , polyacrylonitrile , nanofiber , catalysis , nanoporous , electrospinning , carbonization , chemical engineering , imidazolate , dopant , carbon fibers , nanotechnology , polymer , metal organic framework , chemistry , doping , composite material , organic chemistry , electrochemistry , electrode , composite number , engineering , scanning electron microscope , adsorption , ring (chemistry) , optoelectronics
Designing rational nanostructures of metal–organic frameworks based carbon materials to promote the bifunctional catalytic activity of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly desired but still remains a great challenge. Herein, an in situ growth method to achieve 1D structure‐controllable zeolitic imidazolate frameworks (ZIFs)/polyacrylonitrile (PAN) core/shell fiber (PAN@ZIFs) is developed. Subsequent pyrolysis of this precursor can obtain a heteroatom‐doped carbon nanofiber network as an efficient bifunctional oxygen electrocatalyst. The electrocatalytic performance of derived carbon nanofiber is dominated by the structures of PAN@ZIFs fiber, which is facilely regulated by efficiently controlling the nucleation and growth process of ZIFs on the surface of polymer fiber as well as optimizing the components of ZIFs. Benefiting from the core–shell structures with appropriate dopants and porosity, as‐prepared catalysts show brilliant bifunctional ORR/OER catalytic activity and durability. Finally, the rechargeable Zn‐air battery assembled from the optimized catalyst (CNF@Zn/CoNC) displays a peak power density of 140.1 mW cm −2 , energy density of 878.9 Wh kg Zn −1 , and excellent cyclic stability over 150 h, giving a promising performance in realistic application.