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2021, Volume 15, Issue 4

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Frontiers of Chemical Science and Engineering >> 2021, Volume 15, Issue 4 doi: 10.1007/s11705-020-2005-y

Pyrolysis transformation of ZIF-8 wrapped with polytriazine to nitrogen enriched core-shell polyhedrons carbon for supercapacitor

. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China.. School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.. College of Arts and Sciences, Khalifa University of Science and Technology, Abu Dhabi, UAE

Received: 2020-11-27 Accepted: 2021-01-25 Available online: 2021-01-25
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Abstract

This work presents a simple effective strategy to synthesize -doped and shell-controlled carbon nanocages through a package baking approach. A green approach to synthesize core-shell ZIF-8@PTZ nanoparticles involves zinc contained ZIF-8 core wrapped by a N-enriched polytriazine (PTZ). Synthesized core-shell ZIF-8@PTZ nanoparticles are calcinated to further sublime zinc through PTZ shell and washed by HCl, leaving a porous carbon structure. At the meantime, hollow cavities were introduced into N-doped carbon polyhedrons via the sacrifice of ZIF-8 template (noted as ZIF-8@C/N-x). The electrochemical performance of the ZIF-8@C/N-x as supercapacitor electrode has demonstrated high energy density and specific capacitance, as well as a long-term cycleability showing 92% capacitance retention after 10000 cycles. There is a systematic correlation between micro-/meso-porosity of ZIF-8@C/N-x and their electrochemical performances.

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