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采用阳极氧化法在含0.4mol/L HF的乙二醇电解液中制备高度有序的一维TiO2纳米管阵列,并采用柠檬酸溶剂热还原法在TiO2纳米管阵列表面沉积Pt纳米颗粒,研究Pt纳米颗粒对TiO2纳米管阵列光电化学性能的影响,对纳米管的结构、形貌、成分进行了表征,采用电化学工作站对沉积前后的TiO2纳米管阵列进行循环伏安扫描,并用5W紫外LED灯对不同沉积条件下样品的光电流进行测试.结果表明,所制TiO2纳米管排列整齐,管径均匀,约为150nm,壁厚约20nm,管长约为20μm;尺寸约20nm的Pt纳米颗粒在纳米管内部分布均匀,Pt以单质形式存在.Pt沉积可提高TiO2纳米管的电化学活性,并明显增加TiO2纳米管对紫外光的吸收能力和光电流响应,Pt纳米颗粒的沉积温度为100℃时具有最大光电流响应,最高瞬时光电流值为289.84μA.
A highly ordered one-dimensional TiO2 nanotube array was prepared by anodic oxidation in ethylene glycol electrolyte containing 0.4 mol / L HF. Pt nanoparticles were deposited on the surface of TiO2 nanotube arrays by citric acid solvothermal reduction The effect of Pt nanoparticles on the photoelectrochemical properties of TiO2 nanotube arrays was investigated. The structure, morphology and composition of the nanotubes were characterized. Cyclic voltammetric scanning of TiO2 nanotube arrays was performed by electrochemical workstation before and after deposition. The results showed that the prepared TiO2 nanotubes were arranged neatly with a uniform diameter of about 150 nm and a wall thickness of about 20 nm with a tube length of about 20 μm. Pt nanoparticles with a size of about 20 nm Pt was deposited in the form of simple substance.The Pt deposition could improve the electrochemical activity of TiO2 nanotubes and significantly increase the UV absorption capacity and photocurrent of TiO2 nanotubes.The deposition temperature of Pt nanoparticles was 100 ℃ When the maximum photocurrent response, the highest instantaneous photocurrent value of 289.84μA.