Facile fabrication of NiOxHy films and their unique electrochromic properties
- 154 Downloads
The electrochromic (EC) NiOxHy films were fabricated through a facile sol–gel method. The formation of high quality NiOxHy films came from adding the xerogel back into the sol and prolonging the annealing time at gradually increasing temperature up to 250 °C. Scanning electron microscopy and atomic force microscopy characterizations indicated films were compact, homogenous, and smooth. Glance angle X-ray diffraction investigation testified NiOxHy films were of poor crystallization. The Fourier transform infrared, and thermogravimetry and differential thermal analysis showed that films contained the mixture of NiO, Ni(OH)2, NiOOH, water, and organic substance. With the increasing of the xerogel ratio, the optical absorbance and reflectance of films had larger differences between the colored and bleached state, respectively. The film with the xerogel ratio of 1:5 showed excellent EC properties with a transmittance contrast as high as 60.88% at λ = 560 nm, which was higher than other sol–gel nickel oxide films reported.
KeywordsDifferential Thermal Analysis Oxygen Evolution Reaction Colored State Electrochromic Property Bleached State
We appreciate the financial supports of the National science Foundation of China (Grant No. 60576013, 60536010 and J0630313).
- 1.Granqvist CG (1995) Handbook of inorganic electrochromic materials. Elsevier, AmsterdamGoogle Scholar
- 11.Moser FH, Lyman NR (1990) US Patent No. 4959247, 25 SeptemberGoogle Scholar
- 12.Liu F, Zhou M, Zhong Y-Y, Song Y, Li J-R, Yang W-F, Feng B-X (2008) J Funct Mater 39:1835Google Scholar
- 15.Ryu HW, Choi GP, Lee WS, Park JS (2004) J Mater Sci 39:4375. doi: https://doi.org/10.1023/B:JMSC.0000033431.52659.e5 CrossRefGoogle Scholar
- 23.Cerc Korošec R, Bukovec P (2006) Acta Chim Slov 53:136Google Scholar
- 24.Wendlandt WW (1964) Thermal methods of analysis. Interscience Publishers, New York, p 17Google Scholar