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Multi-node CdS hetero-nanowires grown with defect-rich oxygen-doped MoS2 ultrathin nanosheets for efficient visible-light photocatalytic H2 evolution

查看全文 作　　者：Haifeng [1]Lin;Yanyan [2]Li;Haoyi [1]Li;Xun [1]Wang 高影响力作者 机构地区：[1]Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China;[2]Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China高影响力机构 出　　处：《Nano Research》索引2017年第10卷第4期,共16页高影响力期刊 基　　金：Acknowledgements This work was supported by the National Natural Science Foundation of China (Nos. 21431003 and 21521091) and China Ministry of Science and Technology (No. 2016YFA0202801). We also thank Dr. Lina Zhang and Ms. Xiaohua Gu for their kind help with the TEM measurements. 摘　　要：Developing low-cost and high-efficiency photocatalysts for hydrogen production from solar water splitting is intriguing but challenging. In this study, unique one-dimensional (1D) multi-node MoS2/CdS hetero-nanowires (NWs) for efficient visible-light photocatalytic H2 evolution are synthesized via a facile hydrothermal method. Flower-like sheaths are assembled from numerous defect-rich O-incorporated {0001} MoS2 ultrathin nanosheets (NSs), and {112̅0}-facet surrounded CdS NW stems are grown preferentially along the c-axis. Interestingly, the defects in the MoS2 NSs provide additional active S atoms on the exposed edge sites, and the incorporation of O reduces the energy barrier for H2 evolution and increases the electric conductivity of the MoS2 NSs. Moreover, the recombination of photoinduced charge carriers is significantly inhibited by the heterojunction formed between the MoS2 NSs and CdS NWs. Therefore, in the absence of noble metals as co-catalysts, the 1D MoS2 NS/CdS NW hybrids exhibit an excellent H2-generation rate of 10.85 mmol·g-1·h-1 and a quantum yield of 22.0% at λ = 475 nm, which is far better than those of Pt/CdS NWs, pure MoS2 NSs, and CdS NWs as well as their physical mixtures. Our results contribute to the rational construction of highly reactive nanostructures for various catalytic applications. 关 键 词：CdS hetero-nanowires defect-rich oxygen-doped MoS2 ultrathin nanosheets active sites charge separation visible-light photocatalysis
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