In situ ion-exchange synthesis of SnS2/g-C3N4 nanosheets heterojunction for enhancing photocatalytic activity
In situ ion-exchange synthesis of SnS2/g-C3N4 nanosheets heterojunction for enhancing photocatalytic activity
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原位离子交换合成 SnS2/g-C3N4 纳米片异质结以增强光催化活性
DOI：
10.1039/c5ra21506d
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Fang, Liang
中科院分区：
文献类型：
--
作者：
Liu, Yongping;Chen, Peng;Fang, Liang
本文通过混合溶剂（水/IPA = 2/1）液相剥离合成了独立式石墨氮化碳（g-C3N4）纳米片，并通过简单的离子交换过程制备了一系列不同SnS2含量的SnS2/g-C3N4异质结。剥离后的g-C3N4呈现出厚度为2.8 nm的二维片状结构，直径为5-10 nm的小SnS2纳米粒子很好地锚定在g-C3N4纳米片的表面，这一点通过透射电子显微镜（TEM）和原子力显微镜（AFM）证明。 4.0-SnS2/g-C3N4 样品在 0.8 V 下表现出最高光电流密度，为 13.66 μA cm−2，分别约为 g-C3N4 纳米片的 1.5 倍和块状 g-C3N4 的 2 倍。光催化测量还表明，与纯g-C3N4和g-C3N4纳米片相比，构建SnS2/g-C3N4异质结可以提高光催化效率。 SnS2/g-C3N4异质结的高效光电化学和光催化活性归因于光生空穴电子对的有效分离。这项工作可能为高性能g-C3N4基光催化剂的合理设计提供新的概念。
In this paper, free standing graphitic carbon nitride (g-C3N4) nanosheets have been synthesized by mixed solvents (water/IPA = 2/1) liquid phase exfoliation, and a series of SnS2/g-C3N4 heterojunctions with different contents of SnS2 have been prepared via a simple ion-exchange process. Exfoliated g-C3N4 presents a two-dimension sheet-like structure with the thickness of 2.8 nm and small SnS2 nanoparticles with diameter of 5–10 nm are well anchored on the surface of g-C3N4 nanosheets, which was proved by transmission electron microscopy (TEM) and atomic force microscope (AFM). The 4.0-SnS2/g-C3N4 sample shows the highest photocurrent density of 13.66 μA cm−2 at 0.8 V, which is about 1.5 time of the g-C3N4 nanosheets and 2 times of the bulk g-C3N4, respectively. Photocatalytic measurement also demonstrated that constructing heterojunction of SnS2/g-C3N4 can improve the photocatalytic efficiency as compared to pure g-C3N4 and g-C3N4 nanosheets. The highly effective photoelectrochemical and photocatalytic activities of SnS2/g-C3N4 heterojunctions are attributed to the efficient separation of photogenerated hole–electron pairs. This work may provide a novel concept for the rational design of high performance g-C3N4-based photocatalysts.