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电化学(中英文) ›› 2020, Vol. 26 ›› Issue (6): 868-875.  doi: 10.13208/j.electrochem.190719

• 研究论文 • 上一篇    下一篇

溶解氧及波长对光助阳极沉积CeO2薄膜的影响

晋通正1, 杨雨萌1,*(), 范圣慧1, 卫国英1,*(), 张昭2   

  1. 1. 中国计量大学材料与化学学院,杭州 310018
    2. 浙江大学化学系,杭州 310027
  • 收稿日期:2019-07-19 修回日期:2019-11-18 出版日期:2020-12-28 发布日期:2020-02-07
  • 通讯作者: 杨雨萌,卫国英 E-mail:yangyumeng@cjlu.edu.cn;guoyingwei@cjlu.edu.cn
  • 基金资助:
    国家自然科学基金项目资助No(51771173);国家自然科学基金项目资助No(21171155);国家自然科学基金项目资助No(51471156)

Synergistic Effect of Dissolving O2 and Wavelength on the Photo-Assisted Anodic Deposition of CeO2 Thin Films

JIN Tong-zheng1, YANG Yu-meng1,*(), FAN Sheng-hui1, WEI Guo-ying1,*(), ZHANG Zhao2   

  1. 1. School of Materials and Chemistry, China Jiliang University, Hangzhou, 310018, China
    2. Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
  • Received:2019-07-19 Revised:2019-11-18 Published:2020-12-28 Online:2020-02-07
  • Contact: YANG Yu-meng,WEI Guo-ying E-mail:yangyumeng@cjlu.edu.cn;guoyingwei@cjlu.edu.cn

摘要:

本文主要研究在含有0.05 mol·L-1硝酸铈、0.1 mol·L-1乙酸铵和70%(体积比)乙醇的镀液中通过阳极电沉积法在316 L不锈钢电极表面上制备CeO2薄膜,并讨论了三种单色光波长以及镀液中溶解氧对阳极沉积CeO2的影响. 采用计时安培曲线、椭圆偏振光谱、扫描电子显微镜、掠角X射线衍射和拉曼光谱方法研究了薄膜的电镀行为、表面形貌及其结构. 结果表明,本研究中的有效光照射波长为365 nm和254 nm,415 nm的波长不足以将电子从导带激发到价带. 随着入射光波长从254 nm增加到415 nm,薄膜的厚度与结晶度均逐渐减小,波长的变化对CeO2薄膜表面形貌的影响很小. 少量的氧气对光助阳极沉积CeO2薄膜有积极作用,但会生成较多的铈的氧化物颗粒吸附在电极表面. 在光电化学系统中,O2常用作电子捕获剂. 随着溶解氧含量的增加,O2将捕获对沉积有积极作用的光生电子,进而抑制阳极沉积的反应速率.

关键词: CeO2薄膜, 电沉积, 光助, 波长, 溶解氧

Abstract:

Cerium dioxide (CeO2) thin films have been applied as new material in many technical fields such as solid oxide fuel cells, catalysts, UV absorbents, pharmacology, and coatings for corrosion protection of many metals and alloys. Electrodeposition is widely considered to be one of the best preparation methods for CeO2 film. In this work, the CeO2 films were prepared by photo-assisted anodic deposition in the bath solutions containing 0.05 mol·L-1 cerium (III) nitrate, 0.1 mol·L-1 ammonia acetate and 70% (V/V) ethanol onto 316L stainless steel (SS) surface. The synergistic effects of three monochromatic light wavelengths (i.e., 254 nm, 365 nm and 415 nm) and the dissolving O2 have been discussed. The influences of dissolving O2 and light wavelength on the electroplating behavior, morphology and structure of the CeO2 films were studied by chronoamperometry, ellipsometry, scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. Results showed that photo-irradiation was helpful to the anodic growth of CeO2 films. With the increase of wavelength from 254 nm to 415 nm, both the crystallinity and film thickness were decreased. Surface morphologies of the CeO2 films on the anode were slightly affected by the wavelength. The effective light wavelengths in this study were 365 nm and 254 nm and the photon energy of 415 nm was not enough to excite electrons from the conduction band to the valence band. A small amount of oxygen had a positive effect on the photo-assisted anode electrodeposition of the CeO2 thin film, but it would generate more CeO2 adsorbed on the surface. In the photo electrochemical system, ethanol is usually used as a hole scavenger and O2 is usually used as an electron scavenger. Due to the presence of ethanol in the bath, as the dissolved oxygen content increasing, O2 would capture the photo-generated electrons which are able to produce positive effect on the deposition, leading to the slower deposition reaction.

Key words: CeO2 thin film, electrodeposition, photo-assisted, wavelength, dissolving oxygen

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