Sol-gel deposited nickel oxide films for electrochromic applications

被引:86
作者
Zayim, E. Ozkan [1 ]
Turhan, I. [1 ]
Tepehan, F. Z. [1 ]
Ozer, N. [2 ]
机构
[1] Istanbul Tech Univ, Fac Sci & Literature, TR-34469 Istanbul, Turkey
[2] San Francisco State Univ, Sch Engn, San Francisco, CA 94132 USA
关键词
nickel oxide; sol-gel processing; surface morphology; electrochromism;
D O I
10.1016/j.solmat.2007.03.034
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The electrochromic (EC) behavior, the microstructure, and the morphology of sol-gel deposited nickel oxide (NiOx) coatings were investigated. The films were produced by spin and dip-coating techniques on indium tin oxide (ITO)/glass and Corning glass (2947) substrates. The coating solutions were prepared by reacting nickel(II) 2-ethylhexanoate as the precursor, and isopropanol as the solvent. NiOx was heat treated at 350 degrees C for 1 h. The surface morphology, crystal structure, and EC characteristics of the coatings were investigated by scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), atomic force spectroscopy (AFM), X-ray diffractometry (XRD), and cyclic voltammetry (CV). SEM and AFM images revealed that the surface morphology and surface characteristics of the spin- and dip-coated films on both types of substrate were different. XRD spectra revealed that both films were amorphous, either on ITO or Corning glass substrates. CV showed a reversible electrochemical insertion or extraction of the K+ ions, cycled in 1 M KOH electrolyte, in both type of film. The crystal structure of the cycled films was found to be XRD amorphous. Spectroelectrochemistry demonstrated that dip-coated films were more stable up to 1000 coloration-bleaching cycles, whereas spin-coated films gradually degraded after 500 cycles. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:164 / 169
页数:6
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