Regulating interfacial morphology and charge-carrier utilization of Ti3C2 modified all-sulfide CdS/ZnIn2S4 S-scheme heterojunctions for effective photocatalytic H2 evolution
Regulating interfacial morphology and charge-carrier utilization of Ti3C2 modified all-sulfide CdS/ZnIn2S4 S-scheme heterojunctions for effective photocatalytic H2 evolution
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DOI：
10.1016/j.jmst.2021.11.003
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发表时间：
2021-12
影响因子：
10.9
通讯作者：
Jun-Chuan Bai;Weiling Chen;Rongchen Shen;Zhimin Jiang;Peng Zhang;Wei Liu;Xin Li
中科院分区：
文献类型：
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作者：
Jun-Chuan Bai;Weiling Chen;Rongchen Shen;Zhimin Jiang;Peng Zhang;Wei Liu;Xin Li
金属硫化物半导体光催化剂中电子与空穴的分离效率和表面还原反应的增强是促进光催化水中析氢的重要因素。控制金属硫化物基光催化剂的界面形态和载流子利用，可以有效地提高电子与空穴的分离效率，增加表面反应活性位点，被认为是提高半导体光催化活性的有效方法。本文首次采用两步溶剂热法合成了Ti3C2（Mxene）修饰的全硫化物2D/2D S-scheme异质结Ti3C2/ ZnIn2S4(ZIS)/CdS复合材料。全硫化物s型异质结的形成提高了电子-空穴分离的效率。紧密的二维/二维范德华结构提供了强大的相互作用力和大的接触面积，以增强电荷转移。2D ti3c2的加入形成了堆积层，减少了电子和空穴的复合。在协同促进下，制备的Ti3C2/ZIS/CdS复合光催化剂产氢量最高可达8.93 mmol/h/g。这项工作不仅通过集成欧姆结和2D/2D全硫化物s型异质结丰富了光催化体系，而且为工程界面形态和载流子利用提供了令人满意的设计策略。
The separation efficiency of electrons and holes and the enhancement of the surface reductive reaction in the metal sulfide semiconductor photocatalysts are important factors in boosting photocatalytic H2evolution from water. The control of both interface morphology and the charge–carrier utilization of metal sulfide-based photocatalysts can effectively improve the separation efficiency of electrons and holes and increase the surface reaction active sites, which are considered to be effective methods to improve the photocatalytic activity of semiconductors. Here, the Ti3C2(Mxene) modified all-sulfide 2D/2D S-scheme heterojunction Ti3C2/ ZnIn2S4(ZIS)/CdS composite material was firstly synthesized by a two-step solvothermal method. The formation of all-sulfide S-scheme heterojunction improves the efficiency of electron-hole separation. The intimate 2D/2D van der Waals structure provides a strong interaction force and a large contact area to enhance charge transfer. The addition of 2D Ti3C2forms the accumulation layer, reducing the recombination of electrons and holes. Under the synergistic promotion, the highest hydrogen production of the prepared Ti3C2/ZIS/CdS composite photocatalyst could reach 8.93 mmol/h/g. This work not only enriches the photocatalytic systems through integrating the ohmic junction and the 2D/2D all-sulfide S-scheme heterojunction, but also provides a satisfactory design strategy for engineering interfacial morphology and charge-carrier utilization.