Abstract：
Green energy technology is generally becoming one of hot issues that need to be solved due to the adverse effects on the environment of fossil fuels. One of the strategies being studied and developed by theorists and experimentalists is the use of photoelectrochemical (PEC) cells, which are emerging as a candidate to produce hydrogen from water splitting. However, creating photoelectrodes that meet the requirements for PEC water splitting has emerged as the primary obstacle in bringing this technology to commercial fruition. Here, we construct a heterostructure, which consists of MoS2/TiO2/Au nanoparticles (NPs) to overcome the drawbacks of the photoanode. Owing to the dependence on charge transfer, the bandgap of MoS2/TiO2and the utilization the Au NPs as a stimulant for charges separation of TiO2by localized surface plasmon resonances effect as well as the increase of hot electron injection to cathode, leading to photocatalytic activities are improved. The results have recorded a significant increase in the photocurrent density from 2.3μAcm-2of TiO2to approximately 16.3μAcm-2of MoS2/TiO2/Au NPs. This work unveils a promising route to enhance the visible light adsorption and charge transfer in photo-electrode of the PEC cells by combining two-dimensional materials with metal NPs.
摘要：
由于化石燃料对环境的不利影响，绿色能源技术正逐渐成为亟待解决的热点问题之一。理论家和实验家正在研究和开发的策略之一是使用光电化学（PEC）电池，它们正在成为从水分解产生氢的候选者。然而,创建满足PEC水分解要求的光电极已成为将该技术实现商业成果的主要障碍。这里,我们构造了一个异质结构，它由MoS2/TiO2/Au纳米颗粒（NPs）组成，以克服光电阳极的缺点。由于对电荷转移的依赖，MoS2/TiO2的带隙和利用AuNP作为激发剂，通过局域表面等离子体共振效应以及增加热电子注入阴极，导致光催化活性得到改善。结果表明，光电流密度从TiO2的2.3μAcm-2显着增加到MoS2/TiO2/AuNP的约16.3μAcm-2。这项工作揭示了一条有希望的途径，通过将二维材料与金属NP结合来增强PEC电池光电电极中的可见光吸附和电荷转移。
