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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 H2 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 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 co ...[more]

PMID: 36505674

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Project description:Graphitic carbon nitride (GCN), as a promising photocatalyst, has been intensely investigated in the photocatalytic fields, but its performance is still unsatisfactory. To date, metal ion doping has been proven to be an effective modification method to improve the photocatalytic activity of GCN. More importantly, comprehensive understanding of the doping mechanism will be of benefit to synthesize efficient GCN based photocatalysts. In this work, K+-doped GCN samples were prepared via heating the mixture of the preheated melamine and a certain amount of KCl at different synthetic temperatures. XRD and Raman characterization studies indicated that the introduction of K+ could improve its crystallinity at higher temperature but reduce its crystallinity at lower temperature. Moreover, FTIR and SEM-EDS measurements implied that K+ are found dominantly in the surface of the ion-doped sample prepared at lower temperature, while they are found both in the surface and bulk of the ion-doped sample prepared at higher temperature. These observations revealed that K+ distributed in the surface of the ion-doped GCN could inhibit its crystal growth, while K+ distributed inside of the ion-doped GCN could promote its crystallinity. Owing to the greater inducing effect of the bulk K+ than the disturbing effect of the surface K+, the improvement of the crystallinity for K+-doped GCN was achieved. As a result, the K+-doped GCN with higher crystallinity yielded an obviously higher H2 evolution rate than that with lower crystallinity under visible light irradiation (>420 nm). Besides, it was observed that the K+-doped GCN prepared at higher temperature exhibits significantly greater adsorption capacity for methylene blue than the K+-doped GCN prepared at lower temperature. This work would provide an insight into optimizing metal ion doped GCN with high photocatalytic activity. The greater inducing effect than the disturbing effect of K ions results in the improved crystallinity and enhanced photocatalytic hydrogen evolution activity of graphitic carbon nitride.

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

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

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