Enhancement of the Photoelectrocatalytic H-2 Evolution on a Rutile-TiO2(001) Surface Decorated with Dendritic MoS2 Monolayer Nanoflakes
Enhancement of the Photoelectrocatalytic H-2 Evolution on a Rutile-TiO2(001) Surface Decorated with Dendritic MoS2 Monolayer Nanoflakes
复制标题
树枝状 MoS2 单层纳米片修饰的金红石-TiO2(001) 表面光电催化 H-2 析出的增强
DOI：
10.1021/acsaem.0c00682
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发表时间：
2020
影响因子：
6.4
通讯作者：
Dou Ruifen
中科院分区：
文献类型：
--
作者：
Zhang Shiping;Li Xiaying;Zhang Xingli;Wang Xina;Wang Weipeng;Yu Richeng;Cao Yimin;Zhang Di;Wang Shuyang;He Lin;Nie Jiacai;Xiong Changmin;Dou Ruifen
将二维二硫化钼纳米结构与其他半导体结合用于光电催化（PEC）水分解制氢（H2）是一种非常有前途的环保方法，可以提供可持续的清洁能源。本文通过简单的化学气相沉积方法，在金红石- tio2（001）单晶表面上设计生长出具有枝晶、半致密、分形和致密形状的原子层mos2纳米片。比较探讨了四种不同形貌的MoS2/ tio2氢化物电极的PEC析氢反应（HER）。复合电极的PEC - HER性能得到增强，产氢效率从分形到致密三角形再到半致密，最后到枝晶mos2纳米片依次增加。PEC - HER效率提高的机理一方面可以通过相应增加mos2层中活性位点的有效边长来解释。另一方面，MoS2/ tio2界面处的能带重新排列有利于tio2中的光生电子转移到MoS2的活性位点，从而也导致h2产率增强。在TiO2上的枝状MoS2纳米片作为优良的长波光吸收剂，其有效边长扩大为活性位点，而能带重新排列有利于光电子迁移到MoS2的活性位点上，这对提高枝状MoS2/TiO2复合电极的PEC - HER效率起着多重作用。我们希望这项工作为开发高效的混合HER催化剂提供一条可行的途径。
The incorporation of two-dimensional MoS2nanostructures with other semiconductors used in photoelectrocatalytic (PEC) water-splitting for hydrogen (H2) production has been a very promising and eco-friendly approach for providing sustainable clean energy. Herein, atomic-layer MoS2nanoflakes with tuned morphologies, including dendritic, semicompact, fractal, and compact shapes, are grown by design on a rutile-TiO2(001) single crystal surface via a facile chemical vapor deposition method. The PEC hydrogen evolution reaction (HER) of the MoS2/TiO2hydride electrodes with four different MoS2morphologies is comparatively explored. Enhanced PEC HER performance is observed for the composite electrodes, where the H2production efficiency sequentially increases from the fractal to the compact triangular to the semicompact and finally to the dendritic MoS2nanoflakes. The mechanism of improvement of the PEC HER efficiency can, on the one hand, be accounted for by the corresponding increase in the effective edge length of the active sites in the MoS2layer. On the other hand, band realignment at the MoS2/TiO2interface favors the transfer of the photogenerated electrons in TiO2to the active sites of MoS2, thereby also leading to enhanced H2production. The dendritic MoS2nanoflakes on TiO2, which serve as excellent long-wavelength light absorbers with the enlarged effective edge length as active sites, and the band realignment, which facilitates the migration of the photogenerated electrons onto the active sites of MoS2, play multiple roles in enhancing the PEC HER efficiency for the dendritic MoS2/TiO2composite electrodes. We hope that this work provides a feasible route toward the development of efficient hybrid HER catalysts.