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Confined Pyrolysis of ZIF‐8 Polyhedrons Wrapped with Graphene Oxide Nanosheets to Prepare 3D Porous Carbon Heterostructures
Author(s) -
Ding Bing,
Fan Zengjie,
Lin Qingyang,
Wang Jie,
Chang Zhi,
Li Tao,
Henzie Joel,
Kim Jeonghun,
Dou Hui,
Zhang Xiaogang,
Yamauchi Yusuke
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201900277
Subject(s) - materials science , graphene , oxide , carbon fibers , pyrolysis , nanotechnology , microporous material , heterojunction , porosity , imidazolate , composite number , chemical engineering , honeycomb , composite material , optoelectronics , engineering , metallurgy
Heterostructured materials are interesting because they may combine two or more material building blocks that together generate new types of heterointerfaces with unusual properties. Using them to construct large‐scale 3D frameworks further extends their utility in electrochemical applications because it exposes more interfaces and active sites. In this study, electrostatic interactions are used to wrap polyhedra particles of zeolitic imidazolate frameworks with graphene oxide (GO) nanosheets to prepare the composite structure. Pyrolyzing this structure generates a 3D porous carbon framework (PCF) composed of polyhedral‐shaped hollow carbon coated with reduced GO. The size of the polyhedral macropores can be adjusted from nanometer scale to micrometer scale. The PCFs generate a continuous network of heterostructured carbon with a large surface area and large pore volumes that are particularly useful as porous electrodes in lithium–sulfur batteries. The PCF/S composite electrode exhibits a high discharge capacity of 1151 mAh g −1 at 1 C and a low capacity decay of 0.035% per cycle after 650 cycles.