Li Yang, Liao Dan, Li Tianyi, Zhong Wei, Wang Xuefei, Hong Xuekun, Yu Huogen
Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
J Colloid Interface Sci. 2020 Jun 15;570:232-241. doi: 10.1016/j.jcis.2020.02.093. Epub 2020 Feb 24.
Constructing Z-scheme photocatalysts is one of the most effective technologies to enhance the photocatalytic reduction or oxidation ability in artificial photosynthesis. For the BiVO photocatalyst, it usually shows limited photocatalytic ability because of the severe bulk recombination of photogenerated carriers and the poor reduction reaction of photogenerated electrons. In this paper, a novel plasmonic Z-scheme Pt-Au/BiVO single-crystal photocatalyst was constructed to solve the above issues. Here, Au nanoparticles are selectively deposited on the electron-rich (0 1 0) facet of BiVO, while Pt nanoparticles are selectively modified on the Au surface. Photocatalytic results indicated that the resultant Pt-Au/BiVO Z-scheme photocatalyst exhibits an obviously higher photocatalytic performance than pure BiVO, Au/BiVO, randomly deposited BiVO(Pt-Au/BiVO(R)) and conventional Pt-Au/BiVO. More importantly, compared with the well-known Pt/BiVO(2.0 wt%), the Pt-Au/BiVO not only exhibits a higher photocatalytic performance, but also loads a lower amount of high-cost Pt cocatalyst. The excellent photocatalytic activity of the plasmonic Z-scheme Pt-Au/BiVO photocatalyst can be attributed to the synergistic effect of crystal-facet engineering and selective loading of Pt-Au, which results in the orientation transfer of photogenerated carriers in the single-crystal BiVO, the enhanced reduction power of photogenerated electrons, and the rapid oxygen-reduction reaction on Pt cocatalyst.
构建Z型光催化剂是提高人工光合作用中光催化还原或氧化能力的最有效技术之一。对于BiVO光催化剂，由于光生载流子在体内的严重复合以及光生电子的还原反应较差，其光催化能力通常有限。本文构建了一种新型的等离子体Z型Pt-Au/BiVO单晶光催化剂来解决上述问题。在此，金纳米颗粒选择性地沉积在BiVO富电子的(0 1 0)晶面上，而铂纳米颗粒则选择性地修饰在金表面。光催化结果表明，所得的Pt-Au/BiVO Z型光催化剂表现出明显高于纯BiVO、Au/BiVO、随机沉积的BiVO(Pt-Au/BiVO(R))和传统Pt-Au/BiVO的光催化性能。更重要的是，与著名的Pt/BiVO(2.0 wt%)相比，Pt-Au/BiVO不仅表现出更高的光催化性能，而且负载的高成本铂助催化剂的量更低。等离子体Z型Pt-Au/BiVO光催化剂优异的光催化活性可归因于晶面工程和Pt-Au选择性负载的协同效应，这导致了单晶BiVO中光生载流子的定向转移、光生电子还原能力的增强以及铂助催化剂上快速的氧还原反应。
