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首页> 外文期刊>Catalysis science & technology >Exploring different photocatalytic behaviors of CdxZn1-xSeyS1-y gradient-alloyed quantum dots via composition regulation
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Exploring different photocatalytic behaviors of CdxZn1-xSeyS1-y gradient-alloyed quantum dots via composition regulation

机译：探索不同的光催化行为CdxZn1-xSeyS1-y gradient-alloyed量子点通过作文监管

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摘要

Gradient-alloyed quantum dots (QDs) are new and interesting photocatalysts for efficient solar-to-chemical energy conversion to solve increasing energy and environmental problems. Nevertheless, few studies have been devoted to exploring structure-property relationships of gradient-alloyed QDs via the composition regulation. Herein we offer band-engineered gradient-alloyed QDs CdxZn1-xSeyS1-y prepared by stoichiometry control over the composition manipulation and has a funnel-shaped energy level. The effect of band structure on the photocatalytic performance of CdxZn1-xSeyS1-y QDs demonstrated that the regulation of light-harvesting range, charge carrier separation ability and redox reactivity can be achieved by composition and size adjustments. The results show that red QDs have the best electron/hole separation ability and widest photon capturing scope, while blue QDs possess the highest redox reactivity, realizing the contaminant degradation and CO2 reduction, simultaneously, with a high apparent rate constant k(app) of 0.4237 min(-1). Moreover, green QDs could be employed as a well-luminescent material owing to the fast electron-hole recombination rate. The mechanistic investigations reveal that different activities are dependent on a combination of two factors, that are ion migration-induced conversion of electron configuration and size-induced band bending. The understanding obtained in the present study is valuable for on-demand designing the unique properties of gradient-alloyed QDs.
机译：Gradient-alloyed量子点(量子点)是新的有趣的高效催化剂solar-to-chemical能量转换来解决提高能源和环境问题。然而,很少有研究致力于探索组织性能的关系量子点gradient-alloyed通过构图监管。量子点gradient-alloyed CdxZn1-xSeyS1-y准备的化学计量控制组成操作和有一个漏斗状的能量的水平。量子点CdxZn1-xSeyS1-y的光催化性能证明的规定聚光范围,电荷载体分离能力和氧化还原反应可以通过组成和大小调整。量子点显示,红色有最好的电子/洞分离能力和广泛的光子捕获量子点范围,而蓝色拥有最高的氧化还原反应活性,实现污染物降解和二氧化碳减少,同时,高表观速率常数k (app)的0.4237分钟(1)。此外,量子点绿色的可以使用well-luminescent材料由于快电子空穴复合率。调查显示,不同的活动依赖于两个因素的结合,离子migration-induced转换的电子构型和size-induced乐队弯曲。本研究为按需设计是有价值的量子点gradient-alloyed的独特性能。

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