TY - JOUR
T1 - Sol-gel deposited nickel oxide films for electrochromic applications
AU - Ozkan Zayim, E.
AU - Turhan, I.
AU - Tepehan, F. Z.
AU - Ozer, N.
PY - 2008/2
Y1 - 2008/2
N2 - 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 °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.
AB - 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 °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.
KW - Electrochromism
KW - Nickel oxide
KW - Sol-gel processing
KW - Surface morphology
UR - http://www.scopus.com/inward/record.url?scp=36048985003&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2007.03.034
DO - 10.1016/j.solmat.2007.03.034
M3 - Article
AN - SCOPUS:36048985003
SN - 0927-0248
VL - 92
SP - 164
EP - 169
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
IS - 2
ER -