Author: Meulenkamp, E.A.
Description: Electrodeposition of amorphous electrochromic tungsten trioxide Formula was studied. Good quality films were deposited cathodically onto tin-doped indium oxide (ITO) from a water/isopropanol solution containing dissolved tungsten(VI) species. Three reducible species are present in this solution: unbound Formula , polytungstate ions, and peroxy-tungstate ions. The effects of the Formula content, which is related to the age of the deposition solution, and of mass transport on the deposition current and deposition efficiency were determined and used to elucidate the mechanism of electrodeposition. Reduction of unbound Formula and polytungstate did not result in film growth. This part of the current was under mixed diffusion-kinetic control. The remainder of the current was due to reduction of peroxy-tungstate and was kinetically limited. This process led to Formula deposition. The current efficiency, defined as the number of electrons consumed by reduction of peroxy-tungstate per W atom deposited, was about 1.6, in good agreement with the proposed deposition reaction.
Subject headings: electro; deposition; tungsten; alloys; thin; film devices; surface alloying; titanium alloys
Publication year: 1997
Journal or book title: Journal of The Electrochemical Society
Volume: 144
Issue: 5
Pages: 1664
Find the full text :Â https://iopscience.iop.org/article/10.1149/1.1837657/meta
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Type: Journal Article
Serial number: 1906