MoS2 / GO到MoS2 / MoO3-x / RGO的氧化歧化：集成和等离子二维多功能纳米复合材料，用于从近红外和可见光区域产生太阳能,The Journal of Physical Chemistry C

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MoS2 / GO到MoS2 / MoO3-x / RGO的氧化歧化：集成和等离子二维多功能纳米复合材料，用于从近红外和可见光区域产生太阳能
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-08-23 , DOI: 10.1021/acs.jpcc.9b05983
Kshirodra Kumar Patra ₁ , Manoj Kumar Ghosalya ₁ , Himanshu Bajpai ₁ , Sreeya Raj ₁ , Chinnakonda S. Gopinath ₁

Affiliation

二维（2D）半导体材料最近被证明是有效的等离子体材料，是昂贵的贵金属的替代品。然而，调整2D半导体的等离子体激元共振并与另一种材料或半导体集成以用于各种应用（例如太阳光收集）仍然是一个挑战。在本文中，我们设计了一种简单而诱人的方法，该方法可促进氧气从MoS ₂ / GO（MG）复合材料的氧化石墨烯（GO）层中扩散，从而通过在惰性气氛下进行热处理显着地氧化MoS ₂层。这是形成MoS ₂ / MoO _{3– x} / RGO（MMR）（x= 0、0.5和1，并且所有化学计量比共存），这是由于MoS ₂ / GO的歧化以及各组分之间存在大量异质结。观察到的行为归因于Mo ⁴⁺阳离子（MoS ₂）的氧化，导致MMR中较高的氧化态（MoO _3–_x的Mo ⁵⁺和Mo ⁶⁺），这也改变了价带电子结构和工作合成物的功能。带有大量Mo ⁵⁺氧化态的2D MoO _3-_x层由于等离激元效应而使电荷载流子的产生变得容易，而MoS ₂提供了催化的活性位点。太阳能H通过在一个复合材料中组合等离子体和催化作用，在可见光和近红外区域证明了₂代的产生。这些结果证明了RGO在提供能级对准，电荷载流子扩散以及帮助在复合材料中产生等离子体效应方面的重要作用。

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Oxidative Disproportionation of MoS2/GO to MoS2/MoO3–x/RGO : Integrated and Plasmonic 2D-Multifunctional Nanocomposites for Solar Hydrogen Generation from Near-Infrared and Visible Regions

Two dimensional (2D) semiconductor materials have been recently demonstrated to be effective plasmonic materials and alternatives to costly noble metals. However, tuning the plasmon resonance of 2D semiconductors and integrating with another material or semiconductor for various applications, such as solar light harvesting, remains a challenge. Herein, we designed a simple and attractive method, which facilitates the diffusion of oxygen from the graphene oxide (GO) layers of the MoS₂/GO (MG) composite to oxidize the MoS₂ layers significantly due to thermal treatment under inert atmosphere. This is the key step in the formation of MoS₂/MoO_3–x/ RGO (MMR) (x = 0, 0.5, and 1, and all stoichiometries co-exist), due to disproportionation of MoS₂/GO, with bulk heterojunctions among the components. The observed behavior is attributed to the oxidation of Mo⁴⁺ cations (of MoS₂) to higher oxidation states in MMR (Mo⁵⁺ and Mo⁶⁺ of MoO_3–x), which also alters the valence-band electronic structure and work function of the resulting composite. The 2D MoO_3–x layers with a large amount of Mo⁵⁺ oxidation states enables facile charge carrier generation due to plasmonic effect, whereas MoS₂ provides active sites for catalysis. The solar H₂ generation was demonstrated in the visible and near-infrared region by combining both the plasmonic and catalytic effects in one composite. These results demonstrate the important role of RGO to provide energy-level alignment, charge carrier diffusion, and help to generate plasmonic effect in the composite.

更新日期：2019-08-25

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