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Issue 27, 2020
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Nitrogen-doped hollow carbon nanoflowers from a preformed covalent triazine framework for metal-free bifunctional electrocatalysis

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Abstract

Fabrication of nitrogen-doped hollow carbon nanostructures is of great importance for achieving efficient electron and ion transport as a metal-free electrocatalyst. Herein, we report a step-wise polymerization and carbonization route to prepare N-doped hollow carbon nanoflowers (N-HCNFs) with a high nitrogen content up to 5.3 at%. A preformed covalent triazine framework (CTF) network assembled on a melamine-cyanuric acid (MCA) supermolecular crystal was achieved via a step-wise polymerization. The subsequent carbonization was conducted to obtain hollow and porous carbon materials with a unique flower-shape. Excellent electrochemical oxygen reduction reaction (ORR) performance with a positive half-wave potential of 0.84 V (vs. RHE) was achieved with excellent stability and methanol resistance in alkaline media. Furthermore, for the hydrogen evolution reaction (HER), a low overpotential of 243 mV at a current density of 10 mA cm−2 and a small Tafel slope of 111 mV dec−1 in acidic media were shown.

Graphical abstract: Nitrogen-doped hollow carbon nanoflowers from a preformed covalent triazine framework for metal-free bifunctional electrocatalysis

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Article information


Submitted
08 Jun 2020
Accepted
18 Jun 2020
First published
18 Jun 2020

Nanoscale, 2020,12, 14441-14447
Article type
Communication

Nitrogen-doped hollow carbon nanoflowers from a preformed covalent triazine framework for metal-free bifunctional electrocatalysis

Y. Zheng, S. Chen, H. Song, H. Guo, K. A. I. Zhang, C. Zhang and T. Liu, Nanoscale, 2020, 12, 14441
DOI: 10.1039/D0NR04346J

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