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Abstract
The porous silicon as substrate material was prepared by metal-assisted chemical etching (MACE) method. The TiO2 nanowire cover layer on porous silicon was prepared by hydrothermal method. Thus, porous Si/TiO2 nanowire heterostructure was obtained. The formation of the porous Si/TiO2 nanowire heterostructure was confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results of diffuse reflection spectra (DRS) show that porous Si/TiO2 nanowire has the highest antireflectivity among the four tested samples. Photoelectric catalysis (PEC) and photocurrent measurement show that the porous Si/TiO2 nanowire heterostructure has higher photoelectric catalytic and photocurrent activity than the other samples under the simulated solar light and visible light irradiation. The results showed that the construction of the porous Si/TiO2 nanowire heterostructure improved the photoelectrochemical properties, which is attributed to the heterogeneous effect and window effect.
Highlights
Energy source and environment have become an urgent problem for every country all over the world, and the utilization of clean and reproducible energy becomes the important task for us especially [1,2,3,4,5]
Hwang et al [29] studied the photoelectric Journal of Nanomaterials catalysis of n-SiNWs/TiO2 nanowire heterojunction and pSiNWs/TiO2 nanowire heterojunction for aqueous phenol solution, and the results show that the n-SiNWs/TiO2 nanowire heterojunction have higher photoelectric catalysis activity compared with the p-SiNWs/TiO2 nanowire heterojunction due to the window effect
The peaks result shows that the porous Si/TiO2 nanowire heterostructure has been synthesized by the combination of metal-assisted chemical etching and hydrothermal synthesis
Summary
Energy source and environment have become an urgent problem for every country all over the world, and the utilization of clean and reproducible energy becomes the important task for us especially [1,2,3,4,5]. In the electrolyte without fluoric anion, oxides are formed on the surface of the porous silicon, and photocurrent would be shut off [27]. Qu et al [28] prepared porous silicon nanowires by the silver particle-assisted chemical etching method. The photocatalytic properties of porous silicon nanowires were studied, and the result shows that the porous silicon nanowires can utilize the entire spectral regime from UV to near IR range. The photoelectrocatalytic and photocurrent activity of porous Si/TiO2 nanowire heterostructure under simulated solar light and visible light irradiation were studied. The photocurrent and photoelectrocatalytic mechanism of porous Si/TiO2 nanowire heterostructure were studied
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