about Tungsten Oxide Film

Thermodynamically, tungsten trioxide (WO3) is reported to be stable in acidic
environments. However, the relatively high dissolution rate of WO3 in acidic solution has long been recognized by those investigating the mechanism of WO3
 coloration (electrochromism) for application in the flat panel display industry(2). To date the exact mechanism by which this dissolution process occurs remains elusive. While in alkaline environments the dissolution of WO3 is both thermodynamically favorable and experimentally observed, there has been no generalgreement on the dissolution mechanism. To examine oxide composition, structure, and hydration as a function of solution pH and applied potential in situ, surface enhanced Raman spectroscopy was employed. In addition,electrochemical impedance spectroscopy was used in conjunction with rotating disk electrode experiments to examine the effects of mass transport on the native tungsten oxides as a function of solution pH and applied potential.

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