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From ZIF-8 Polyhedron to Three-Dimensional Nitrogen Doped Hierarchical Porous Carbon: An Efficient Electrocatalyst for Oxygen Reduction Reaction

Abstract

Nitrogen-doped carbon materials derived from metal-organic frameworks (MOFs) have been proposed as the promising electrocatalysts for oxygen reduction reaction (ORR) but still face a great challenge to replace Pt. In this work, A NaCl-assisted exfoliation approach was developed to synthesize three-dimensional (3D) nitrogen doped hierarchical porous carbons (NHPCs) by the pyrolysis of ZIF-8 polyhedron. At high temperature, NaCl crystals become molten salt which not only serves as templates wrapping ZIF-8 derived carbon but also as intercalation agents penetrating through the carbon via capillarity to promote the formation of nanosheets and mesopores and prevent the aggregation of nanosheets. The morphology, graphitic degree and nitrogen type of the resulting carbons are effectively controlled by tuning the NaCl/ZIF-8 mass ratio and pyrolysis temperature. The as-prepared optimal carbons show intertwined nanosheet structure with rich micro- and mesopores, high surface area, suitable graphitic degree and nitrogen type. Benefiting from these desirable features, the optimal NHPCs exhibit excellent ORR electrocatalytic performances, much better than Pt/C, and also show high capacity and outstanding long-term discharge stability in Zn-air batteries. This work provides a simple and appealing method to prepare hierarchical porous structured carbon materials, and possesses a great potential to be extended to other MOFs for energy-related applications.

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Publication details

The article was received on 14 Mar 2018, accepted on 30 Apr 2018 and first published on 03 May 2018


Article type: Paper
DOI: 10.1039/C8TA02385A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    From ZIF-8 Polyhedron to Three-Dimensional Nitrogen Doped Hierarchical Porous Carbon: An Efficient Electrocatalyst for Oxygen Reduction Reaction

    C. Xuan, B. Hou, W. Xia, Z. Peng, T. Shen, H. L. Xin, G. Zhang and D. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02385A

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