Porous structure design and the content regulation of heteroelements have been proved to be effective strategies to boost photocatalytic H generation activity of graphitic carbon nitride (g-CN) based photocatalyst. Herein, a series of porous graphitic carbon nitride with high concentration of oxygen (g-CN-O) photocatalysts were synthesized polymerization process using colloidal SiO as oxygen source. The content of oxygen within the g-CN-O photocatalysts could be tuned by adjusting the amount of added colloidal SiO during the preparation procedure. The introduced oxygen replaced two-coordinated nitrogen atom, influencing band edge position and localized electron distribution, thereby enhancing visible light harvesting and photoelectric conversion. As a result, the g-CN-O photocatalyst with an optimal oxygen content (8.39 wt%) showed 10.5 fold enhancement in H evolution rate compared to that of bulk g-CN, attributed to the porous structure and high concentration of incorporated oxygen.
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| http://dx.doi.org/10.1039/d2ra05662c | DOI Listing |
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