Spectroscopic and electrochemical studies of electrochromic hydrated nickel oxide films

Conference · Tue Jul 01 00:00:00 EDT 1986

OSTI ID:5148390

Yu, P C; Nazri, G; Lampert, C M

The electrochromic properties of hydrated nickel oxide thin films electrochemically deposited by anodization onto doped tin oxide-coated glass have been studied by transmittance measurements, cyclic voltammetry, Fourier-transform infrared spectroscopy, and ion-backscattering spectrometry. The spectral transmittance is reported for films switched in both the bleached and colored states. The photopic transmittance (T/sub p/) can be switched from T/sub p/(bleached) = 0.77 to T/sub p/(colored) = 0.21, and the solar transmittance (T/sub S/) can be switched from T/sub S/(bleached) = 0.73 to T/sub S/(colored = 0.35. Also reported is the near-infrared transmittance (T/sub NIR/), which was found to switch from T/sub NIR/(bleached) = 0.72 to T/sub NIR/(colored) = 0.55 for a film thickness of 500 A. The bleached condition is noted to have very low solar absorption in both the visible and solar regions. Ion-backscattering spectrometry was performed on the hydrated nickel oxide film, yielding a composition of NiO/sub 1.0/ (dehydrated). Cyclic voltammetry showed that, for films in the bleached or colored state, the reversible reaction is Ni(OH)/sub 2/ ..-->.. NiOOH + H/sup +/ + e/sup -/. Voltammetry also showed that the switching of the film is controlled by the diffusion of protons, where OH/sup -/ plays a role in the reaction mechanism. Analysis of the hydrated nickel-oxide thin films by Fourier-transform infrared spectroscopy revealed that both the bleached and colored states contain lattice water and hydroxyl groups. The surface hydroxyl groups play an important role in the coloration and bleaching of the anodically deposited nickel oxide thin films.

• Research Organization: Lawrence Berkeley Lab., CA (USA); General Motors Research Labs., Warren, MI (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5148390
• Report Number(s): LBL-21421; CONF-8604210-2; ON: DE87000114
• Resource Relation: Conference: 3. international symposium on optical and optoelectrical applied science and engineering, Innsbruck, Austria, 14 Apr 1986; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
NICKEL OXIDES
ELECTROCHEMISTRY
ELECTROCHROMISM
BACKSCATTERING
INFRARED SPECTRA
LIGHT TRANSMISSION
VOLTAMETRY
CHALCOGENIDES
CHEMISTRY
ELECTRO-OPTICAL EFFECTS
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SPECTRA
TRANSITION ELEMENT COMPOUNDS
320100* - Energy Conservation
Consumption
& Utilization- Buildings