In-situ Reduction Synthesis of Cu2O Quantum Dots Modifying g-C3N4 for Enhanced Photocatalytic Hydrogen Production
首发时间:2013-10-31
Abstract:In this paper, Cu2O quantum dots (QDs) were directly formed on g-C3N4 via a one-pot in-situ reduction method. The physical and photophysical properties of these Cu2O QDs modified g-C3N4 photocatalysts were characterized to investigate the effects of Cu2O QDs on the photocatalytic activities of g-C3N4. Close contact was formed between Cu2O and g-C3N4 and the Cu2O QDs were well dispersed on g-C3N4. The visible light photocatalytic hydrogen production activity over g-C3N4 was enhanced by more than 70% with the Cu2O QDs modification. The photocatalytic mechanism analysis revealed that the close contact, efficient visible light absorption and Type II band alignment induced charge separation by Cu2O QDs modification should be the key factors for the improved photocatalytic performance.
keywords: physical chemistry Cu2O/g-C3N4 quantum dots Type II band alignment hydrogen production
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原位还原合成Cu2O修饰g-C3N4及其光催化制氢性能研究
摘要:本文采用原位还原法制备了一系列不同Cu含量的Cu2O 量子点负载g-C3N4光催化剂。并对其光电化学性质进行了表征(TEM, XRD, UV-vis, PL, XPS)。表征结果发现,此法合成的Cu2O 量子点与g-C3N4之间形成紧密接触的P-N结,二者的电子和空穴可以通过TypeII 能带关系进行传输,大大降低了光生载流子的复合几率,同时,由于Cu2O 量子点的导带高于g-C3N4,Cu2O也起到了光敏化的作用。基于上述作用,g-C3N4的可见光产氢效率在Cu2O量子点的负载下提高了70%。
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