Ali Asad, Mangrio Farhana Akbar, Chen Xiaolin, Dai Yiwen, Chen Kui, Xu Xiaoliang, Xia Ruixiang, Zhu Lixin
Department of Surgery & Central Laboratory, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, PR China.
Nanoscale. 2019 Apr 23;11(16):7813-7824. doi: 10.1039/c8nr10320h.
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.
在这项工作中，我们制备了具有暴露活性边缘位点和高电导率的超薄二硫化钼纳米片，其能够在可见光区域充分吸收光以实现太阳能转换。金纳米晶体修饰的二硫化钼纳米片在紫外-可见光区域促进了光电化学水分解的充分增强。不同的金纳米结构，如金纳米颗粒和纳米棒，被修饰在二硫化钼纳米片的表面以促进光电化学水分解。通过在FTO基板上旋涂合成的金修饰二硫化钼混合光阳极，光电化学水氧化效率在可见-红外区域显著提高，纳米棒提高了2倍，纳米颗粒提高了3.5倍；此外，与未修饰金的二硫化钼光阳极相比，平均光电阻降低了一半，并且当系统偏压大于0.7伏时，光电流呈指数增加。金-二硫化钼金属-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方面起着重要作用。这种对独特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分解。当前的这一贡献为利用等离子体金属/半导体异质结构有效收集紫外-可见光用于太阳能燃料生产提供了一条新途径。
