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Porous graphitic carbon nitride with high concentration of oxygen promotes photocatalytic H2 evolution.


ABSTRACT: Porous structure design and the content regulation of heteroelements have been proved to be effective strategies to boost photocatalytic H2 generation activity of graphitic carbon nitride (g-C3N4) based photocatalyst. Herein, a series of porous graphitic carbon nitride with high concentration of oxygen (g-C3N4-O) photocatalysts were synthesized via in situ polymerization process using colloidal SiO2 as oxygen source. The content of oxygen within the g-C3N4-O photocatalysts could be tuned by adjusting the amount of added colloidal SiO2 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-C3N4-O photocatalyst with an optimal oxygen content (8.39 wt%) showed 10.5 fold enhancement in H2 evolution rate compared to that of bulk g-C3N4, attributed to the porous structure and high concentration of incorporated oxygen.

SUBMITTER: Jia R 

PROVIDER: S-EPMC9687292 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Porous graphitic carbon nitride with high concentration of oxygen promotes photocatalytic H<sub>2</sub> evolution.

Jia Ruokun R   Yu Xueli X   Yang Xiaohang X   Wang Xinzhe X   Yang Jiaming J   Huo Xuyang X   Qi Qiuju Q  

RSC advances 20221124 52


Porous structure design and the content regulation of heteroelements have been proved to be effective strategies to boost photocatalytic H<sub>2</sub> generation activity of graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) based photocatalyst. Herein, a series of porous graphitic carbon nitride with high concentration of oxygen (g-C<sub>3</sub>N<sub>4</sub>-O) photocatalysts were synthesized <i>via in situ</i> polymerization process using colloidal SiO<sub>2</sub> as oxygen source. The co  ...[more]

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