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Issue 14, 2018
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Tuning the dimensions and structures of nitrogen-doped carbon nanomaterials derived from sacrificial g-C3N4/metal–organic frameworks for enhanced electrocatalytic oxygen reduction

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Abstract

Here we demonstrate a facile strategy for tuning the dimensions and structures of nitrogen-doped carbon nanomaterials via regulating the ratio of Co/Zn in zeolitic imidazolate framework (ZIF) arrays in situ grown on g-C3N4 nanosheets, followed by a pyrolysis process. One-dimensional nitrogen-doped bamboo-like carbon nanotube encapsulated Co nanoparticle (Co/N-BCNTs), two-dimensional nitrogen-doped carbon nanosheet (N-CNS) and three-dimensional nitrogen-doped carbon nanotube framework encapsulated Co nanoparticle (Co/N-CNTFs) electrocatalysts are successfully fabricated from Zn/Co-ZIF@g-C3N4, ZIF-8@g-C3N4 (Co free) and ZIF-67@g-C3N4 (Zn free), respectively. The resulting Co/N-BCNTs electrocatalyst exhibits a better oxygen reduction reaction (ORR) activity than the other two catalysts, with a half-wave potential of 0.83 V (versus the reversible hydrogen electrode) in alkaline solutions, which is superior to that of a commercial Pt/C catalyst. More importantly, the Co/N-BCNTs show much higher stability and better methanol-tolerance than the Pt/C catalyst in a 0.1 M KOH solution. It has been demonstrated that the enhanced catalytic performance of Co/N-BCNTs is attributed to their suitable surface area, well-dispersed N dopants, and Co encapsulated inside carbon nanotubes. The presented strategy offers new prospects in developing highly active electrocatalysts.

Graphical abstract: Tuning the dimensions and structures of nitrogen-doped carbon nanomaterials derived from sacrificial g-C3N4/metal–organic frameworks for enhanced electrocatalytic oxygen reduction

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Publication details

The article was received on 14 Jan 2018, accepted on 23 Feb 2018 and first published on 24 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00439K
Citation: J. Mater. Chem. A, 2018,6, 5752-5761
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    Tuning the dimensions and structures of nitrogen-doped carbon nanomaterials derived from sacrificial g-C3N4/metal–organic frameworks for enhanced electrocatalytic oxygen reduction

    R. Wang, T. Yan, L. Han, G. Chen, H. Li, J. Zhang, L. Shi and D. Zhang, J. Mater. Chem. A, 2018, 6, 5752
    DOI: 10.1039/C8TA00439K

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