Enhanced Electron Transfer from the Excited Eosin Y to mpg-C3N4 for Highly Efficient Hydrogen Evolution under 550 nm Irradiation

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• 作者：Shixiong Min ; Gongxuan Lu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：September 20, 2012
• 年：2012
• 卷：116
• 期：37
• 页码：19644-19652
• 全文大小：494K
• 年卷期：v.116,no.37(September 20, 2012)
• ISSN：1932-7455

文摘

Graphitic carbon nitride (g-C₃N₄) is a novel and stable metal-free photocatalyst that can generate H₂ from water under visible light irradiation, but its activity is significantly limited due to the insufficient light absorption in the solar spectrum (weak absorption in the wavelength longer than 460 nm). In this paper, we demonstrate that the photoresponse of the mesoporous g-C₃N₄ (mpg-C₃N₄) can be greatly extended up to nearly 600 nm by sensitization with Eosin Y (EY). This sensitization photocatalyst demonstrates high and rather stable photocatalytic activity for H₂ evolution under visible light irradiation, especially in the longer wavelength regions (450鈥?00 nm). The apparent quantum efficiency (AQE) of 19.4% under 550 nm irradiation has been obtained. These results indicate that efficient electron transfer between excited EY molecules and mpg-C₃N₄ is achieved. The mpg-C₃N₄ with high surface area and nanoporous structure can greatly facilitate EY molecules assembly on the surface, thus promoting the activity via improved light harvesting.