摘要
Hydrogen energy, as one clean energy, is one of the important ways to decarbonize in the future. The advancement of doping and constructing defect engineering in graphitic carbon nitride (g-C3N4) show promise for artificial photosynthesis for H2 evolution using solar energy. Unfortunately, it is still difficult to generate g-C3N4 that has been co-modified by doping and defect and investigate their synergistic effects. In this study, potassium thioacetate was used first-time as a potassium source and dehydrogenation agent to prepare g-C3N4 decorated by K+ ions and cyano groups with enhanced H2 evolution by a one-step method in an air atmosphere. The presence of K+ ions can increase the density of electron clouds in the delocalized π bond of the heptazine ring. The cyano group may successfully delocalize the solitary valence electrons in conjugated heterocycles since it is a potent electron-withdrawing group. These outcomes allow the modified catalysts to achieve improved H2 evolution activity, reduced interfacial transfer resistance, and increased light absorption and photocurrent. Finally, K(0.05)-CN's photocatalytic hydrogen evolution rate (HER) rose to 1319 μmol h−1 g−1, which is five-fold better than that of CN, and the normalized HER reached 118 μmol h−1 m−2, which was much higher than other reports. This research not only offers a fresh approach to creating photocatalysts with good H2 evolution efficiency but also advances a deep understanding of how structural defects and alkali metal doping affect photocatalytic activity.
源语言 | 英语 |
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页(从-至) | 6729-6738 |
页数 | 10 |
期刊 | Ceramics International |
卷 | 49 |
期 | 4 |
DOI | |
出版状态 | 已出版 - 15 2月 2023 |