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Cathodic Electrodeposition of Mixed Molybdenum Tungsten Oxides from Peroxo-polymolybdotungstate Solutions†
journal contribution
posted on 2006-12-05, 00:00 authored by Lilia Kondrachova, Benjamin P. Hahn, Ganesh Vijayaraghavan, Ryan D. Williams, Keith J. StevensonMixed molybdenum tungsten trioxide films of varying stoichiometry (MoxW1 - xO3, 0 < x < 1) were prepared by
cathodic electrodeposition on indium tin oxide (ITO)-coated glass substrates from aqueous peroxo-polymolybdotungstate
solutions. Electrochemical quartz crystal microbalance (EQCM), cyclic voltammetry, and chronocoulometry were
used to gain insight into the electrodeposition mechanism. The compositional and structural properties were characterized
for MoxW1 - xO3 films deposited at intermediate potentials (−0.35 V vs Ag/AgCl) and sintered at 250 °C using
energy-dispersive spectroscopy, X-ray diffraction, and Raman spectroscopy. These studies reveal that films consist
of homogeneously mixed MoxW1 - xO3, with an enriched Mo content ranging in composition from 0.4 < x < 0.7
depending upon the mol % Mo present in the deposition solution. Chronoamperometry and spectroelectrochemical
measurements were conducted to estimate lithium ion diffusion coefficients and coloration efficiencies for the mixed
metal oxide films in 1 M LiClO4/propylene carbonate. The subtle interplay between structural and compositional
properties due to the uniform mixing of Mo and W oxide components shows that electrochromic and lithium ion
transport properties are moderately enhanced relative to those of single-component WO3 and MoO3 and demonstrate
improved structural stability over pure MoO3 polymorphs during electrochemical cycling.
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WOMoxWdeposition solutionMo contentcathodic electrodepositionindium tin oxidespectroelectrochemical measurementselectrochemical cyclingRaman spectroscopyestimate lithium ion diffusion coefficientsMixed Molybdenum Tungsten OxidesEQCMgain insightelectrodeposition mechanismcoloration efficienciesITOElectrochemical quartz crystal microbalanceMoO 3MoO 3 polymorphsmetal oxide filmslithium ion transport propertiesCathodic ElectrodepositionW oxide components