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Preparation of an Fe-doped visible-light-response TiO_2 film electrode and its photoelectrocatalytic activity

机译:掺铁可见光响应TiO_2薄膜电极的制备及其光电催化活性

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摘要

Fe-doped TiO_2 film electrodes were prepared by sol-gel and dip-coating methods, and their photoelectrocatalytic properties were investigated under both ultraviolet and visible light through degradation of methyl orange and Rhodamine B. The results showed that the Fe-doped TiO_2 film electrodes mainly consisted of anatase TiO_2. The Fe-doping effectively restrained the grain growth of TiO_2 and the phase transformation of rutile. The modified film substantially extended the photo response from 452 nm to 604 nm and band gap decreased to 2.05 eV. The photocatalytic performance of the Fe-doped TiO_2 film electrode was enhanced. The response current of 1% Fe-doped TiO_2 film electrode was 30.3 μA while TiO_2 film electrode had no response under visible light. The decolorization rate of RhB by 1% Fe-doped TiO_2 film electrode was 22% higher than that of undoped electrode, which indicated that the extended responsive wavelength range greatly expanded the application potential of the modified electrode.
机译:通过溶胶-凝胶法和浸涂法制备了Fe掺杂的TiO_2薄膜电极,并通过降解甲基橙和若丹明B对紫外和可见光下的光电催化性能进行了研究。结果表明,Fe掺杂的TiO_2薄膜电极主要由锐钛矿TiO_2组成。 Fe的掺杂有效地抑制了TiO_2的晶粒长大和金红石相变。改性膜基本上将光响应从452 nm扩展到604 nm,并且带隙降低到2.05 eV。掺杂Fe的TiO_2薄膜电极的光催化性能得到增强。 1%Fe掺杂的TiO_2薄膜电极的响应电流为30.3μA,而TiO_2薄膜电极在可见光下无响应。 1%Fe掺杂的TiO_2薄膜电极的RhB的脱色率比未掺杂的电极高22%,这表明扩展的响应波长范围大大扩展了修饰电极的应用潜力。

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