NiFe2O4/TiO2纳米棒阵列薄膜光电化学性能和光催化性能研究

doi:10.15541/jim20160048

摘要/Abstract

摘要：

用水热法制备一维有序纳米棒状TiO₂薄膜(TiO₂ NRAs), 并采用浸渍沉积煅烧得到NiFe₂O₄/TiO₂ NRAs。借助SEM、TEM、XRD、Raman、XPS、UV-Vis等对样品的物相和形貌结构进行了表征, 结果表明: NiFe₂O₄纳米颗粒均匀沉积在金红石相TiO₂ NRAs表面, 使TiO₂光谱吸收范围拓展至可见光区。利用电化学工作站对其光电转换性能进行研究, 发现NiFe₂O₄改性后的TiO₂在可见光下光电流响应显著增大, 在电压-电流曲线和电流随时间开关灯变化中, NiFe₂O₄/TiO₂ NRAs的光电流密度分别是纯TiO₂ NRAs的12倍和8倍。NiFe₂O₄/TiO₂ NRAs可见光下降解偏二甲肼(UDMH)的效率是单纯TiO₂ NRAs降解率的3倍, 并对光催化降解机理进行了探讨。

关键词: TiO2纳米棒阵列, NiFe2O4/TiO2纳米棒阵列, 光电化学性能, 光催化

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

中图分类号:

O643

高鑫, 刘祥萱, 朱左明, 谢拯, 佘兆斌. NiFe₂O₄/TiO₂纳米棒阵列薄膜光电化学性能和光催化性能研究[J]. 无机材料学报, 2016, 31(9): 935-942.

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.

图/表 10

图1 NiFe2O4/TiO2 NRAs的XRD图谱

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

图2 NiFe2O4/TiO2 NRAs和TiO2 NRAs的拉曼图

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

图3 NiFe2O4/TiO2 NRAs的EDS谱图

Fig. 3 EDS pattern of NiFe2O4/TiO2 NRAs

图4 NiFe2O4/TiO2NRAs的XPS图谱

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

图5 NiFe2O4/TiO2 NRAs的形貌和结构

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

图6 NiFe2O4/TiO2 NRAs的紫外-可见吸收光谱图

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

图7 (a)电压-电流曲线和(b)电流随开关灯变化曲线

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

图8 NiFe2O4/TiO2 NRAs的EIS曲线, 图内为相应的等效电路图

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

图9 可见光下UDMH降解曲线

Fig. 9 Photodegradation of UDMH under visible light

图10 可见光照射下光催化反应原理图

Fig. 10 Schematic of photocatalytic reaction under visible light

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NiFe₂O₄/TiO₂纳米棒阵列薄膜光电化学性能和光催化性能研究

Photoelectrochemical and Photocatalytic Properties of NiFe₂O₄/TiO₂ Nanorod Arrays

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