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Solar Hydrogen Generation over Carbon Nitride Photocatalyst Promoted by Water‐Soluble Carbon Dots

Von Wiley-VCH zur Verfügung gestellt

Solar hydrogen generation from water is one of the promising routes to alleviate the current environmental and energy issues. Graphitic carbon nitride (g-C 3 N 4 ) has emerged as a promising photocatalyst for hydrogen evolution using visible light while withstanding harsh chemical environments. However, the high occurrence of trapped unreactive charges seriously affects the catalytic performance of g-C 3 N 4 in photocatalysis applications. Herein, we show that the addition of water-soluble carbon dots (CDs) to the reaction solution will promote the relaxation of photogenerated electrons in g-C 3 N 4 , thus effectively improving the photocatalytic performance for hydrogen evolution by two times (983.7 vs. 490.7 μmol·h -1 ·g -1 for with and without CDs, respectively). The steady state properties of the reaction system are studied by ultraviolet-visible (UV-vis) and photoluminescence (PL) excitation/emission spectroscopy, which show that the introduction of CDs enhances the visible light absorption of the reaction system. Furthermore, the charge trapping and detrapping processes in g-C 3 N 4 are further revealed by using time-resolved photoluminescence (tr-PL) spectroscopy. The correlation between charge transfer and photocatalytic activity provides new insights into the charge separation dynamics and activity of carbon-based photocatalysts.

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