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Issue 38, 2013
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Enhancement of photocatalytic H2 evolution over nitrogen-deficient graphitic carbon nitride

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Abstract

Nitrogen-deficient graphitic carbon nitride (g-C3N4−x) was synthesized by a hydrothermal treatment using ammonium thiosulfate as an oxidant. The as-prepared photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption–desorption, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), elemental analysis (EA), electron paramagnetic resonance (EPR), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and photoluminescence (PL) spectroscopy. The visible-light-driven photocurrent measurement was performed by several on–off cycles of intermittent irradiation. The photocatalytic activity of catalysts was evaluated by splitting water under visible-light irradiation (λ > 420 nm). Results demonstrated that the photoactivity of g-C3N4−x was enhanced greatly by the deficiency of the terminal amino species on the catalysts. The average H2 evolution rate on g-C3N4−x was 31.6 μmol h−1, which was ca. 3 times higher than that on pristine g-C3N4. It was revealed that the unique nitrogen-deficient structure of g-C3N4−x played an important role in broadened visible-light absorption and efficient electron–hole separation, mainly accounting for the improved photocatalytic activity.

Graphical abstract: Enhancement of photocatalytic H2 evolution over nitrogen-deficient graphitic carbon nitride

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Article information


Submitted
15 Jun 2013
Accepted
02 Aug 2013
First published
02 Aug 2013

J. Mater. Chem. A, 2013,1, 11754-11761
Article type
Paper

Enhancement of photocatalytic H2 evolution over nitrogen-deficient graphitic carbon nitride

Z. Hong, B. Shen, Y. Chen, B. Lin and B. Gao, J. Mater. Chem. A, 2013, 1, 11754
DOI: 10.1039/C3TA12332D

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