催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (12): 1496-1500.DOI: 10.3724/SP.J.1088.2010.00626

• 研究论文 • 上一篇    下一篇

固态光电催化器件 ITO/TiO2/ITO 的构型和机制

赵凤伟, 李静, 尚静, 汪青   

  1. 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室 (北京大学分室), 北京 100871
  • 收稿日期:2010-06-26 出版日期:2010-12-13 发布日期:2014-04-26

Configuration and Mechanism of Solid-State Photoelectrocatalytic Device ITO/TiO2/ITO

ZHAO Fengwei, LI Jing, SHANG Jing*, WANG Qing   

  1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • Received:2010-06-26 Online:2010-12-13 Published:2014-04-26

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摘要： 采用浸渍-提拉法将 TiO2 薄膜负载在具有一定电极构型的氧化铟锡 (ITO) 基底上, 制备了全固态 TiO2 平面型器件 (ITO/TiO2/ITO). 采用扫描电镜对器件的表面形貌和膜厚进行了表征. 以紫外光下器件光电协同催化降解罗丹明 B(RhB) 为模型反应, 考察了器件的构型和空穴捕获剂 (乙醇) 对其光电催化性能的影响. 结果表明, 初始浓度为 10 mg/L 的 RhB 在 1.5 V 偏压和 NaCl (1.5 mol/L) 为电解质的条件下, 光照 60 min 脱色率达到 83%; 阳极面积较大的器件光电催化性能较好, 刻蚀宽度为 2 mm 时光电催化活性最高; 空穴与 TiO2表面吸附的 H2O 氧化生成的羟基自由基对液相光电催化降解 RhB 起着重要作用.

关键词: 二氧化钛薄膜, 光电催化, 器件, 构型, 空穴捕获剂

Abstract: A solid-state TiO2 planar device, ITO/TiO2/ITO, was prepared by immobilizing TiO2 film on indium-tin oxide (ITO) substrate with a certain electrode configuration through a dip-coating method. The surface morphology and film thickness of ITO/TiO2/ITO were characterized by scanning electron microscopy. The effects of configurations of the device and hole scavenger (ethanol) on the photoelectrocatalytic synergetic degradation of rhodamine B (RhB) were investigated over the planar device ITO/TiO2/ITO. The decoloration rate of RhB with the initial concentration of 10 mg/L reached 83% within 60 min. The ITO/TiO2/ITO device with larger photoanode area presented better photoelectrocatalytic properties, and the device with the etching width of 2 mm exhibited the highest photoelectrocatalytic activity. The hydroxyl radicals produced by the water adsorbed on TiO2 surface being oxidized by holes played an important role in liquid-phase photoelectrocatalytic degradation of RhB.

Key words: titania film, photoelectrocatalysis, device, configuration, hole scavenger