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Highly Microporous Nitrogen‐doped Carbon Synthesized from Azine‐linked Covalent Organic Framework and its Supercapacitor Function
Author(s) -
Kim Gayoung,
Yang Jun,
Nakashima Naotoshi,
Shiraki Tomohiro
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702805
Subject(s) - supercapacitor , carbonization , microporous material , materials science , azine , heteroatom , chemical engineering , carbon fibers , graphene , nanotechnology , covalent bond , electrochemistry , organic chemistry , chemistry , composite number , electrode , composite material , scanning electron microscope , ring (chemistry) , engineering
Porous carbons with nitrogen‐doped (N‐doped) structures are promising materials for advanced energy conversion and storage applications, including supercapacitors and fuel cell catalysts. In this study, microporous N‐doped carbon was successfully fabricated through carbonization of covalent organic frameworks (COFs) with an azine‐linked two‐dimensional molecular network (ACOF1). In the carbonized ACOF1, micropores with diameters smaller than 1 nm are selectively formed, and a high specific surface area (1596 cm 2 g −1 ) is achieved. In addition, the highly porous structure with N‐doped sites results in enhancement of the electrochemical capacitance. Detailed investigation for the micropore‐forming process reveals that the formation of nitrogen gas during the thermal degradation of the azine bond contributes to the microporous structure formation. Therefore, the present direct carbonization approach using COFs allows the fabrication of microporous heteroatom‐doped carbons, based on molecularly designed COFs, toward future electrochemical and energy applications.