无机材料学报 ›› 2019, Vol. 34 ›› Issue (8): 797-802.DOI: 10.15541/jim20180463

• 研究论文 •    下一篇

电还原MoSe2修饰TiO2纳米管光电化学性能研究

张亚萍1,丁文明1,朱海丰1,黄承兴1,于濂清1(),王永强1,李哲2,徐飞3   

  1. 1. 中国石油大学(华东) 理学院, 青岛 266580
    2. 青岛洛克环保科技有限公司, 青岛 266071
    3. 淄博盛金稀土新材料科技股份有限公司, 淄博 255039
  • 收稿日期:2018-09-27 修回日期:2018-10-25 出版日期:2019-08-20 网络出版日期:2019-05-13
  • 作者简介:张亚萍(1967-), 女, 博士, 副教授. E-mail: <email>zhangyp@upc.edu.cn</email>。
  • 基金资助:
    国家自然科学基金(21476262);青岛市科技发展计划(14-2-4-108-jch)

Photoelectrochemical Properties of MoSe2 Modified TiO2 Nanotube Arrays

ZHANG Ya-Ping1,DING Wen-Ming1,ZHU Hai-Feng1,HUANG Cheng-Xing1,YU Lian-Qing1(),WANG Yong-Qiang1,LI Zhe2,XU Fei3   

  1. 1. College of Science, China University of Petroleum, Qingdao 266580, China
    2. Luoke Environment Protection Co. Ltd., Qingdao 266071, China
    3. Shengjin Rare Earth on Co. Ltd., Zibo 255039, China
  • Received:2018-09-27 Revised:2018-10-25 Published:2019-08-20 Online:2019-05-13
  • Supported by:
    National Natural Science Foundation of China(21476262);Technology Project of Qingdao(14-2-4-108-jch)

摘要:

通过阳极氧化法在乙二醇电解液中制备TiO2纳米管阵列, 以钼酸钠和亚硒酸为原料, 改变原料的浓度配比以及沉积电压, 电化学还原沉积MoSe2对TiO2纳米管阵列进行修饰, 以半导体复合的方式提高TiO2的光电化学性能。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对复合物进行物相、形貌分析, 通过电化学工作站测试复合材料的线性伏安曲线、交流阻抗。结果表明, MoSe2与TiO2形成了p-n异质结, 降低了光生电子和空穴的复合以及电荷转移电阻显著降低, 使载流子浓度、光电流密度明显增大。沉积电压为-0.5 V, 2 mmol/L H2SeO3沉积30 s, 经过300 ℃热处理的MoSe2/TiO2复合材料具有优异的光电化学性能, 在0 V偏压条件下光响应电流密度为1.17 mA/cm 2, 是空白样品的3倍, 电荷转移电阻从331.6 Ω/cm 2下降到283.9 Ω/cm 2。当热处理温度为330 ℃时, MoSe2会发生团聚, 堵塞TiO2基底, 使得MoSe2/TiO2吸光能力减弱, 综合性能变差。

关键词: TiO2 纳米管阵列, MoSe2, 电化学沉积, 光电化学性能

Abstract:

MoSe2 was deposited by electrochemical reduction method on TiO2 nanotube arrays which were prepared by anodic oxidation in ethylene glycol electrolyte, in which sodium molybdate and seleninic acid were used as raw materials. The composites were characterized by X-ray diffraction and scanning electron microscope, and I-V plot and electrochemical impedance spectroscopy were measured by electrochemical workstation. The results show that a p-n heterojunction is formed between molybdenum diselenide and titanium dioxide, which can reduce the combination of photo-generated electron-hole pairs and charge transfer resistance, and can increase its carrier concentration and light response current density. The composite deposited at -0.5 V in the electrolyte containg 2 mmol/L seleninic acid for 30 s exhibits optimum photo-electrochemical performance after 300 ℃ heat treatment, with a high photocurrent density of 1.17 mA/cm 2 without bias, which is approximately three times higher than that of blank sample. And the charge transfer resistance decreased from 331.6 Ω/cm 2 to 283.9 Ω/cm 2. Selenide molybdenum agglomerates seriously to block the TiO2 nanotube once heat treatment over 330 ℃, resulting in a lower performance.

Key words: TiO2 nanotube arrays, MoSe2, electrochemical deposition, photoelectrochemical property

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