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Issue 37, 2017
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Precisely tunable thickness of graphitic carbon nitride nanosheets for visible-light-driven photocatalytic hydrogen evolution

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Abstract

Graphitic carbon nitride (GCN) nanosheets with unique physicochemical properties have received increasing attention in the area of photocatalysis, yet tunable thickness for the straightforward production of this graphite-like two-dimensional (2D) nanomaterial remains a challenge. In this work, GCN nanosheets with different thicknesses were firstly prepared by a direct calcination of melamine supramolecular aggregates (MSA) obtained from a hydrochloric acid (HCl)-induced hydrothermal assembly approach. The resultant nanosheets over nanometer scale thickness could be precisely controlled via simply adjusting the HCl concentration. Compared to the bulk GCN (BGCN), the thinner nanosheets possessed a high specific surface area, a large electronic-band structure, and fast charge separation ability. The thinnest nanosheets with a thickness of approximately 4 nm exhibited excellent visible-light-driven photocatalytic water splitting performance in hydrogen evolution (524 μmol h−1 g−1), which is over 9-fold higher than the BGCN powder. This work provides a thickness-dependent strategy for the preparation of metal-free GCN nanosheets and develops a promising 2D photocatalyst for application in solar energy conversion.

Graphical abstract: Precisely tunable thickness of graphitic carbon nitride nanosheets for visible-light-driven photocatalytic hydrogen evolution

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Publication details

The article was received on 15 Jul 2017, accepted on 23 Aug 2017 and first published on 24 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR05155G
Citation: Nanoscale, 2017,9, 14103-14110
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    Precisely tunable thickness of graphitic carbon nitride nanosheets for visible-light-driven photocatalytic hydrogen evolution

    Y. Hong, C. Li, D. Li, Z. Fang, B. Luo, X. Yan, H. Shen, B. Mao and W. Shi, Nanoscale, 2017, 9, 14103
    DOI: 10.1039/C7NR05155G

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