Fullerenes/Graphite Carbon Nitride with Enhanced Photocatalytic Hydrogen Evolution Ability

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• 作者：Limin Song ; Tongtong Li ; Shujuan Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：121
• 期：1
• 页码：293-299
• 全文大小：579K
• ISSN：1932-7455

文摘

Graphite carbon nitride (g-C₃N₄) is an excellent photocatalytic hydrogen evolution material by water splitting, but enhancing its photocatalytic activity and stability is still a big challenge. In this study, by utilizing the super ability of fullerenes (C₆₀) to attract electrons, we synthesized C₆₀/g-C₃N₄ photocatalytic composite materials with superior electronic separation efficiency. The addition of C₆₀ greatly improves the photocatalytic hydrogen evolution ability of g-C₃N₄ for water splitting under visible light radiation. The highest hydrogen evolution amount reached 2268.6 μmol/g over 15 mg/L C₆₀/g-C₃N₄ after 10 h, which is 50.1× that of g-C₃N₄ under the same water splitting condition. The hydrogen evolution amount over 15 mg/L C₆₀/g-C₃N₄ in the 0.2 mol/L K₂HPO₄ system is 4161 μmol/g, indicating the addition of K₂HPO₄ boosts the activity of C₆₀/g-C₃N₄. The apparent quantum yield after 76 h was about 5.8%. The long-term photolysis water reaction for 76 h with rising photocatalytic activity exhibits that the C₆₀/g-C₃N₄ has excellent stability in water spitting. We can regulate the photocatalytic activity of C₆₀/g-C₃N₄ by changing the C₆₀ concentration. Photoluminescence spectrum proves the super ability of C₆₀ to attract electrons on the surface of C₆₀/g-C₃N₄. Thus, C₆₀ promotes electron separation efficiency on the surface of g-C₃N₄ and significantly enhances photocatalytic hydrogen evolution ability of g-C₃N₄.