Photoelectrochemical and Photocatalytic Properties of NiFe2O4/TiO2 Nanorod Arrays

doi:10.15541/jim20160048

Abstract

Abstract:

Highly ordered one-dimensional TiO₂ nanorod arrays (TiO₂ NRAs) film was prepared by hydrothermal method. Then through dipping deposition and calcination, the NiFe₂O₄ modified TiO₂ NRAs (NiFe₂O₄/TiO₂ NRAs) was obtained. To analyze the phase and morphology structure of the NiFe₂O₄/TiO₂ NRAs, SEM, TEM, XRD, Raman spectra, XPS, and UV-Vis spectrophotoeter were used. The results showed that NiFe₂O₄ nanoparticles were uniformly deposited on the surface of rutile TiO₂ NRAs, which led to a red shift in absorption spectrum. Considering the photoelectric conversion performance, it is discovered that photocurrent of NiFe₂O₄/TiO₂ was greatly improved compared with that of bare TiO₂ under visible light irradiation. The photocurrent density of NiFe₂O₄/TiO₂ NRAs was 12 times that of bare TiO₂ NRAs in the voltage-current curve, and 8 times that of bare TiO₂ NRAs in the current changes with time switch light. Under visible light irradiation, degradation rate of UDMH by NiFe₂O₄/TiO₂ NRAs was about 3 times as much as that of bare TiO₂ NRAs. Furthermore, schematic of photocatalytic activity under visible light was explored.

Key words: TiO2 NRAs, NiFe2O4/TiO2 NRAs, photoelectrochemical properties, photocatalysis

CLC Number:

O643

GAO Xin, LIU Xiang-Xuan, ZHU Zuo-Ming, XIE Zheng, SHE Zhao-Bin. Photoelectrochemical and Photocatalytic Properties of NiFe₂O₄/TiO₂ Nanorod Arrays[J]. Journal of Inorganic Materials, 2016, 31(9): 935-942.

Figures/Tables 10

Fig. 1 XRD patterns of TiO2 NRAs and NiFe2O4/TiO2 NRAs on FTO substrates

Fig. 2 Raman spectra for bare TiO2 NRAs and NiFe2O4/TiO2 NRAs

Fig. 3 EDS pattern of NiFe2O4/TiO2 NRAs

Fig. 4 (a) XPS survey spectrum of NiFe2O4/TiO2 and its corresponding high-resolution XPS spectra of (b) Ti2p, (c) O1s; (d) Fe2p; (e) Ni2p; (f) C1s

Fig. 5 Morphology and structure of NiFe2O4/TiO2 NRAs SEM images of (a) TiO2 NRAs and (b) NiFe2O4/TiO2NRAs, with insets of their corresponding image on cross section; (c) TEM and (d) HRTEM images of NiFe2O4/TiO2 NRAs

Fig. 6 UV-Vis absorption spectra of NiFe2O4/TiO2 NRAs

Fig. 7 (a) I-V characteristics of NiFe2O4/TiO2 NRAs and (b) current versus time measurements of NiFe2O4/TiO2 NRAs under 0 V versus Ag/AgCl bias

Fig. 8 Nyquist plots of the EIS spectra of NiFe2O4/TiO2NRAs, with the inset showing the equivalent circuit model

Fig. 9 Photodegradation of UDMH under visible light

Fig. 10 Schematic of photocatalytic reaction under visible light

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Photoelectrochemical and Photocatalytic Properties of NiFe₂O₄/TiO₂ Nanorod Arrays

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