A novel strategy to construct Ti-Si mixed oxides shell for yolk@shell Pt nanocatalyst

作者:Zhang, Chao; Zhou, Yuming*; Zhang, Yiwei*; Zhao, Shuo; Fang, Jiasheng; Sheng, Xiaoli; Zhang, Hongxing
来源:Materials Letters, 2017, 188: 172-175.
DOI:10.1016/j.matlet.2016.11.027

摘要

In this work, a novel strategy has been proposed to synthesize a hierarchical Pt@TiO2-mSiO(2) yolk@shell nanocatalyst firstly. Inner active sites could be protected by the TiO2-mSiO(2) shell. The formation mechanism involves the in-situ growth of TiO2 nanosheets and simultaneous redeposition of etch-released silica species. TEM images were employed to characterize each step of the synthesis process. During the hydrothermal process, original TiO2 layer can be converted into a hierarchical structure and the inner SiO2 sphere was etched out automatically. Furthermore, the reduction of 4-nitrophenol had been used to test the hierarchical Pt@TiO2-mSiO(2) yolk@shell nanocatalyst. The mixed oxides shell was constructed with in-situ grown hierarchical TiO2 nanosheets and redeposited SiO2.