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.
Bibliographical noteFunding Information:
B.D. and Z.J.F. contributed equally to this work. The work was funded by Natural Science Foundation of Jiangsu Province (no. BK20170778), NSFC (no. 21773118, U1802256), and Australian Research Council (ARC) Future Fellow (Grant FT150100479). This work was performed in part at the Queensland node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano- and micro-fabrication facilities for Australia's researchers. B.D. also gratefully acknowledges China Postdoctoral Science Foundation (2018M632300), open fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, and Fujian Provincial Key Laboratory of Functional Materials and Applications.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)