Ultrathin MoS2 nanosheets for high-performance photoelectrochemical applications via plasmonic coupling with Au nanocrystals
Ultrathin MoS2 nanosheets for high-performance photoelectrochemical applications via plasmonic coupling with Au nanocrystals
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通过与 Au 纳米晶体的等离子体耦合实现高性能光电化学应用的超薄 MoS2 纳米片
DOI：
10.1039/c8nr10320h
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发表时间：
2019-04-28
期刊：
影响因子：
6.7
通讯作者：
Zhu, Lixin
中科院分区：
文献类型：
--
作者：
Ali, Asad;Mangrio, Farhana Akbar;Zhu, Lixin
在这项工作中，我们制备了具有暴露的活性边缘位点和高电导率的MoS 2纳米片，可以充分吸收可见光区域的光，从而实现太阳能转换。金纳米晶修饰的MoS 2纳米片有利于在紫外可见光区充分增强光电化学水裂解。将Au纳米颗粒和纳米棒等不同的Au纳米结构修饰在MoS 2纳米片表面，以促进光电化学分解水。通过在FTO基底上旋涂合成的金改性的MoS 2杂化光阳极，光电化学水氧化的效率显著提高了2倍（纳米棒）和3.5倍（纳米颗粒）在可见光-红外区域;此外，与不含Au的MoS 2光电阳极相比，平均光学电阻降低了两倍，当系统偏置大于0.7伏时，光电流呈指数级增加。Au-MoS 2金属-半导体界面在研究表面等离子体相互作用、电荷转移机制和电场放大等方面起着重要作用。这种独特的混合纳米结构的合理设计解释了等离子体增强的光电化学水裂解。这种电流贡献为使用等离子体金属/半导体异质结构有效地收集用于太阳能燃料产生的UV-可见光提供了新的途径。
In this work, we prepared ultrathin MoS2 nanosheets with exposed active edge sites and high electric conductivity that can sufficiently absorb light in the visible region to enable solar energy conversion. The gold nanocrystal-decorated MoS2 nanosheets facilitate sufficiently enhanced photoelectrochemical water splitting in the UV-visible region. Different Au nanostructures, such as Au nanoparticles and nanorods, were modified on the surface of MoS2 nanosheets to promote photoelectrochemical water decomposition. By spin-coating a synthetic gold-modified MoS2 hybrid photoanode on a FTO substrate, the efficiency of photoelectrochemical water oxidation was significantly enhanced, by 2 times (nanorods) and 3.5 times (nanoparticles) in the visible-infrared region; furthermore, the average optical resistance was reduced by a factor of two compared to the MoS2 photoanode without Au, and the photocurrent increases exponentially when the system bias was greater than 0.7 volts. The Au-MoS2 metal-semiconductor interface plays an important role in studying the surface plasmon interactions, charge transfer mechanism, and electric field amplification. This rational design for such a unique hybrid nanostructure explains the plasmon-enhanced photoelectrochemical water splitting. This current contribution provides a new path for using the plasmonic metal/semiconductor heterostructure to effectively harvest UV-visible light for solar fuel generation.