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›› 2012, Vol. 12 ›› Issue (6): 1032-1037.

• 材料工程专栏 • 上一篇    下一篇

Pt纳米颗粒修饰TiO2纳米管阵列的合成及其光电化学性能

黄庆明 徐光青 冯春晓 吕珺 吴玉程   

  1. 合肥工业大学材料科学与工程学院 合肥工业大学材料科学与工程学院 合肥工业大学材料科学与工程学院 合肥工业大学南校区199信箱 合肥工业大学材料科学与工程学院
  • 收稿日期:2012-10-18 修回日期:2012-11-28 出版日期:2012-12-20 发布日期:2012-12-20
  • 通讯作者: 徐光青

Synthesis and Photoelectrochemical Properties of Pt Nanoparticles Modified TiO2 Nanotube Arrays

HUANG Qing-ming XU Guang-qing FENG Chun-xiao LU Jun WU Yu-cheng   

  1. School of Materials Science and Engineering, Hefei University of Technology School of Materials Science and Engineering, Hefei University of Technology School of Materials Science and Engineering, Hefei University of Technology School of Materials Sciences and Engineering, Hefei University of Technology School of Materials Science and Engineering, Hefei University of Technology
  • Received:2012-10-18 Revised:2012-11-28 Online:2012-12-20 Published:2012-12-20
  • Contact: XU Guang-qing

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摘要： 采用阳极氧化法在含0.4 mol/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5 W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150 nm，壁厚约20 nm，管长约为20 mm；尺寸约20 nm 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289.84 mA.

关键词: 纳米材料, 光催化, 氧化钛纳米阵列, Pt纳米颗粒, 光电化学

Abstract: Well aligned TiO2 nanotube arrays were prepared by anodic oxidation method in a glycol solution containing 0.4 mol/L HF, and Pt nanoparticles were deposited on anatase TiO2 nanotube arrays by hydrothermal reduction method in the solution containing chloroplatinic acid and citric acid. The structure, morphology and composition of modified TiO2 nanotubes were analyzed, and electrochemical and photoelectrochemical properties measured by an electrochemical workstation combined with a 5 W LED light (365 nm wavelength). TiO2 nanotubes are vertically aligned with a diameter of 150 nm, wall thickness of 20 nm and length of 20 mm. The electrodeposited Pt nanoparticles were in an ordered assembly with a uniform distribution on the inner wall of nanotubes with a particle size of about 10 nm. Comparison of cyclic voltammograms of TiO2 and TiO2(Pt) nanotube arrays in the darkness and under UV illumination shows that Pt nanoparticles modification enhances the electrochemical activities of TiO2 nanotubes and photocurrent response. The highest photocurrent was achieved to be 289.84 mA when Pt deposition temperature was 100℃.

Key words: nanomaterial, photocatalysis, TiO2 nanotube array, Pt nanoparticles, photoelectrochemistry

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