Dissociation-Assembly-Carbonization: A Strategy for Constructing Indium Sulfide Photocatalysts with Increased Reactive Sites and Spatial Charge Separation
Dissociation-Assembly-Carbonization: A Strategy for Constructing Indium Sulfide Photocatalysts with Increased Reactive Sites and Spatial Charge Separation
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DOI：
10.1021/acscatal.3c03494
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发表时间：
2023-10
期刊：
影响因子：
12.9
通讯作者：
Haobo Zhang;Shuo Zhou;Dong Li;Wenwen Zhan;Huade Liu;Liming Sun;Mengge Li;Lei Yang;Jianwei Zhao;Xiaoxiao He;Jianhua Xu;Xiguang Han
中科院分区：
文献类型：
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作者：
Haobo Zhang;Shuo Zhou;Dong Li;Wenwen Zhan;Huade Liu;Liming Sun;Mengge Li;Lei Yang;Jianwei Zhao;Xiaoxiao He;Jianhua Xu;Xiguang Han
充足的表面反应位点和光生载流子的高度分离是光催化反应的两个重要保证。本工作以层状配位化合物In(pydc)2为前驱体，通过解离-组装-碳化过程，获得了由均匀的N,O共掺杂碳包覆In2S3超薄纳米片组装而成的三维（3D）复杂分级结构（N,O-C/In2S3DP）。独特的3D分层结构可以最大程度地暴露超薄纳米片的表面活性位点，为光催化反应提供足够的表面位点。涂覆的N,O共掺杂碳层不仅可以实现光生电子和空穴的空间分离，而且可以促进有机反应物的活化。此外，碳层中N和O的多电子共掺杂有利于超氧自由基（O2·–）的产生，超氧自由基是光催化有机选择氧化反应中的重要活性基团。因此，N,O–C/In2S3DP在各种光源（蓝光、绿光和黄光）照射下对硫化物选择性氧化为亚砜表现出良好的催化活性。这项研究提供了一种设计和合成策略（解离-组装-碳化），用于构建具有特定组成的合适结构，作为未来优异的光催化剂。
Sufficient surface reaction sites and a high separation of photogenerated carriers are two important guarantees for photocatalytic reactions. In this work, using a layered coordination compound In(pydc)2as a precursor, through the dissociation-assembly-carbonization process, a three-dimensional (3D) complex hierarchical structure assembled by uniform N,O-codoped carbon-encapsulated In2S3ultrathin nanosheets (N,O–C/In2S3DP) has been obtained. The unique 3D hierarchical structure can expose the surface-active sites of ultrathin nanosheets to the greatest extent, which provides enough surface sites for photocatalytic reactions. The coated N,O-codoped carbon layer can not only realize the spatial separation of photogenerated electrons and holes but also promote the activation for organic reactants. In addition, the multielectron codoping of N and O in a carbon layer is conducive to the generation of superoxide radicals (O2·–), which is an important active group in a photocatalytic organic selective oxidation reaction. Thus, N,O–C/In2S3DP exhibits good catalytic activity for the selective oxidation of sulfides to sulfoxides under the irradiation of various light sources (blue light, green light, and yellow light). This study provides a design and synthesis strategy (dissociation-assembly-carbonization) for constructing a suitable structure with a specific composition as excellent photocatalysts in the future.