A comparative study on photocatalytic hydrogen evolution activity of synthesis methods of CDs/ZnIn2S4 photocatalysts

A comparative study on photocatalytic hydrogen evolution activity of synthesis methods of CDs/ZnIn2S4 photocatalysts
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CDs/ZnIn2S4光催化剂合成方法光催化析氢活性对比研究

DOI:
10.1016/j.colsurfa.2019.04.073
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发表时间:
2019-08
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
通讯作者:
Kong Yan
Kong Yan
中科院分区:
其他
文献类型:
--
作者:
Lei Kai;Kou Mingpu;Ma Zhaoyu;Deng Yu;Ye Liqun;Kong Yan

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在光催化体系中引入碳材料可以显著提高光催化析氢活性。本文提出并通过三种方法制备了碳纳米点/ZnIn 2S 4(CDs/ZIS)样品。利用SEM、TEM、XPS、UV和PL等手段对样品的形貌、化学元素和价态以及光电性能进行了系统的表征。光催化产氢实验表明,所有CD/ZIS样品的光催化性能都得到了显着提高,这可能是由于CD作为优良的电子受体,可以加速光生电子和空穴的分离效率。在可见光照射下(λ>420 nm),水热一锅法制备的ZIS具有最佳的光催化活性,产氢速率为4.15 mmol g−1.h− 1,是纯ZIS的2.92倍.研究了合成方法对CdS/ZIS纳米复合材料光电性能和光催化活性的影响,为提高光催化剂的光催化性能,走向实际应用提供了可靠的思路。
The introduction of carbon materials in photocatalytic systems can significantly enhance the photocatalytic hydrogen evolution activity. Here, we proposed and fabricated carbon nanodots/Znln2S4(CDs/ZIS) samples via three methods. The morphology, chemical elements and valence, and photoelectric properties of CDs/ZIS samples were systematically characterized by SEM, TEM, XPS, UV and PL. The photocatalytic H2production experiments indicate that the photocatalytic performance of all CDs/ZIS samples has been significantly improved, which could be attributed to the fact that serving as an excellent electron acceptor, CDs can accelerate the separation efficiency of photogenerated electrons and holes. The samples prepared via one-pot hydrothermal method exhibit the optimal photocatalytic activity and the corresponding H2production rate of 4.15 mmol g−1.h−1under visible light irradiation (λ>420 nm), which is about 2.92 times higher than pure ZIS. Our work presented the influence of synthetic method on photoelectric performance and photocatalytic activity of CDs/ZIS nanocomposites, and provided a reliable idea for improving the photocatalytic performance of photocatalyst toward practical applications.
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