NiFe2O4/TiO2纳米棒阵列薄膜光电化学性能和光催化性能研究

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。

Photoelectrochemical and Photocatalytic Properties of NiFe2O4/TiO2 Nanorod Arrays

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.