新型ZnIn2S4@MoS2光催化剂的制备及可见光催化制氢研究

Novel, highly efficient, noble metal-free and environment friendly photocatalytic hydrogen production over semiconductors becomes an extremely defiant and strategic issue. In this case, we should carry out the investigation on the preparation of novel ZnIn2S4@MoS2 photocatalyst and its photocatalytic hydrogen production under visible light,which achieve enhancement the hydrogen evolution efficiency of ZnIn2S4 under non-precious metal as the cocatalyst.We should synthesize the few-layer or limited-layer MoS2 loaded on the ZnIn2S4 by photo-assisted reduction, hydrazine reduction and calcination method, respectively. Comparison of the effect on photocatalytic hydrogen production performance of ZnIn2S4@MoS2 synthesized via the different methods, we screen out the optimum preparation route, which provides reference for large-scale fabrication of ZnIn2S4@MoS2 photocatalyst. The influence of MoS2 loading amounts, sacrifice reagent, the catalyst amounts on photocatalytic activity of ZnIn2S4@MoS2 will be investigated in detail. The optimal photocatalytic reaction conditions will be found. On the basis of above results, the mechanism of MoS2 as cocatalyst for enhancement photocatalytic hydrogen production will be revealed by means of the photoelectrochemistry measurement.

新型、高效、无贵金属、环境友好的半导体光催化制氢体系成为光催化制氢领域的关键性课题，为此本项目开展新型ZnIn2S4@MoS2光催化剂的制备及可见光催化制氢性能研究，实现在无贵金属作为助催化剂的条件下增强ZnIn2S4光催化制氢的效率。本项目分别采用光还原、肼还原和煅烧处理三种方法将少层或有限层MoS2负载在ZnIn2S4表面，比较各种方法对ZnIn2S4@MoS2光催化制氢性能影响，筛选出最适宜的制备方法，为规模化制备ZnIn2S4@MoS2光催化剂提供借鉴。考察MoS2负载量，牺牲试剂，催化剂用量的影响，优化出ZnIn2S4@MoS2可见光催化制氢的最优条件。在此基础上，采用光电化学测试揭示MoS2作为助催化剂增强ZnIn2S4光催化制氢活性机理。

新型、高效、无贵金属、环境友好的半导体光催化制氢体系成为光催化制氢领域的关键性课题，为此本项目采用不同方法制备了MoS2/ZnIn2S4复合光催化剂，并将其应用于可见光催化制氢，实现了以MoS2作助催化剂增强ZnIn2S4光催化制氢效率。本项目分别采用光还原、水热、溶剂热和吸附-煅烧四种方法将少层或有限层MoS2负载在ZnIn2S4表面，详细表征了其微观结构、光学性质和载流子迁移等行为，并研究了MoS2助催化剂的结构、尺寸、形貌、数量以及表面特性对ZnIn2S4光催化分解水制氢性能的影响，阐明了MoS2提高ZnIn2S4光催化制氢活性的机制。该研究对提高无贵金属助催化剂体系的光催化分解水制氢效率具有重大意义。