Opto-electrochemical spectroscopy of metals in aqueous solutions
- Materials Science and Photo-Electronics Laboratory, IRE Program, EBR Center KISR, P.O. Box 24885, Safat 13109 (Kuwait)
In the present investigation, holographic interferometry was utilized for the first time to determine the rate change of the electrical resistance of aluminium samples during the initial stage of anodisation processes in aqueous solution. In fact, because the resistance values in this investigation were obtained by holographic interferometry, electromagnetic method rather than electronic method, the abrupt rate change of the resistance was called electrical resistance–emission spectroscopy. The anodisation process of the aluminium samples was carried out by electrochemical impedance spectroscopy (EIS) in different sulphuric acid concentrations (1.0%–2.5% H{sub 2}SO{sub 4}) at room temperature. In the meantime, the real time holographic interferometry was used to determine the difference between the electrical resistance of two subsequent values, dR, as a function of the elapsed time of the EIS experiment for the aluminium samples in 1.0%, 1.5%, 2.0%, and 2.5% H{sub 2}SO{sub 4} solutions. The electrical resistance–emission spectra of the present investigation represent a detailed picture of not only the rate change of the electrical resistance throughout the anodisation processes but also the spectra represent the rate change of the growth of the oxide films on the aluminium samples in different solutions. As a result, a new spectrometer was developed based on the combination of the holographic interferometry and electrochemical impedance spectroscopy for studying in situ the electrochemical behavior of metals in aqueous solutions.
- OSTI ID:
- 22597089
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
ANODIZATION
AQUEOUS SOLUTIONS
CONCENTRATION RATIO
ELECTRIC CONDUCTIVITY
ELECTROCHEMISTRY
EMISSION SPECTRA
EMISSION SPECTROSCOPY
FILMS
HOLOGRAPHY
IMPEDANCE
INTERFEROMETRY
OXIDES
SPECTROMETERS
SULFURIC ACID
TEMPERATURE RANGE 0273-0400 K