Journal
NEW JOURNAL OF CHEMISTRY
Volume 41, Issue 17, Pages 8920-8926Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj01848g
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Funding
- Education Department of Liaoning Province [L2014145]
- Natural Science Foundation of Liaoning Province [201602467]
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As we all know, more than half of the solar spectrum is near infrared (NIR) light. However, NIR light is seldom utilized in photocatalytic reactions. In this work, the W18O49/g-C3N4 heterojunction catalyst is prepared and used for full-spectrum-driven N-2 photofixation from the UV to the NIR region for the first time. X-ray diffraction, N-2 adsorption, UV-Vis-NIR spectroscopy, scanning electron microscopy, transmission electron microscopy, photoluminescence, X-ray photoelectron spectroscopy and electrochemical impedance spectra were used to characterize the prepared catalysts. The result indicates that the as-prepared W18O49/g-C3N4 heterojunction catalysts display much higher N-2 photofixation performance than individual W18O49 or g-C3N4, which should be due to the improved separation rate of electron-hole pairs. g-C3N4 is the active component in the catalyst for N-2 photofixation. W18O49 plays the role of a light absorber in the full-spectrum to form more photogenerated electrons for recombining the holes in g-C3N4 through the Z-scheme'' mechanism. A possible electron transfer route is proposed.
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