Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 30, Pages 15006-15012Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm32053c
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Funding
- AcRF grant from Ministry of Education and National Environment Agency, Singapore under the Environment Technology Research Programme (ETRP) [ARC25/08 (T208B1215)]
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In situ sulfur-doped mesoporous g-C3N4 (mpgCNS) was synthesized from a simple organosulfur compound, thiourea, using SiO2 nanoparticles as the hard template. The resultant product has a high surface area of 128 m(2) g(-1) and mesopores in the range of 10-20 nm. Based on X-ray photoelectron spectroscopy analysis, the doped sulfur was proposed to substitute carbon in mpgCNS and a downshift of 0.25 eV was resulted in its conduction band. Optical studies indicated that mpgCNS exhibits enhanced and extended light absorbance in the visible light region and a much lower density of defects compared to the native g-C3N4. As a result, mpgCNS has been found to be 30 times more active than the native g-C3N4 for hydrogen evolution from photocatalytic water splitting. A high quantum efficiency of 5.8% at 440 nm was obtained which is among the highest for carbon nitride photocatalysts.
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