Synthesis of O,F Co-Modified g-C<sub>3</sub>N<sub>4</sub> for Photocatalytic H<sub>2</sub> Evolution Activity Improvement and Corrosion Protection
Herein, we report the rational synthesis of porous g-C<sub>3</sub>N<sub>4</sub> co-modified with oxygen (O) and fluorine (F) for the first time. Incorporating colloidal SiO<sub>2</sub> during thermal polymerization introduces lattice oxygen, forming C–O bonds, whi...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/14/12/1063 |
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| Summary: | Herein, we report the rational synthesis of porous g-C<sub>3</sub>N<sub>4</sub> co-modified with oxygen (O) and fluorine (F) for the first time. Incorporating colloidal SiO<sub>2</sub> during thermal polymerization introduces lattice oxygen, forming C–O bonds, while post-treatment with NH<sub>4</sub>·HF<sub>2</sub> establishes C–F bonds. The dual incorporation of O and F elements extends visible light absorption and effectively promotes the separation and transport of photoexcited charge carriers. Consequently, the co-modified g-C<sub>3</sub>N<sub>4</sub> (O,F-g-C<sub>3</sub>N<sub>4</sub>) achieves a 13.2-fold increase in H<sub>2</sub> evolution rate compared to pristine g-C<sub>3</sub>N<sub>4</sub>. This synthesized O,F-g-C<sub>3</sub>N<sub>4</sub> is then dispersed in waterborne polyurethane (WPU) to create an anti-corrosive coating for Q235 carbon steel substrates. Water resistance, mechanical property, and electrochemical characterization analyses reveal that the O,F-g-C<sub>3</sub>N<sub>4</sub>/WPU composite coating exhibits remarkable corrosion resistance with a high protection efficiency of 90.23%. This work offers a straightforward approach for developing highly efficient g-C<sub>3</sub>N<sub>4</sub>-based photocatalysts and corrosion-resistant coatings. |
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| ISSN: | 2073-4352 |