Cathodic Electrodeposition of Mixed Molybdenum Tungsten Oxides from Peroxo-polymolybdotungstate Solutions
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- 作者：Lilia Kondrachova ; Benjamin P. Hahn ; Ganesh Vijayaraghavan ; Ryan D. Williams ; Keith J. Stevenson
- 刊名：Langmuir
- 出版年：2006
- 出版时间：December 5, 2006
- 年：2006
- 卷：22
- 期：25
- 页码：10490 - 10498
- 全文大小：153K
- 年卷期：v.22,no.25(December 5, 2006)
- ISSN：1520-5827
文摘
Mixed molybdenum tungsten trioxide films of varying stoichiometry (MoxW1 - xO3, 0 < x < 1) were prepared bycathodic electrodeposition on indium tin oxide (ITO)-coated glass substrates from aqueous peroxo-polymolybdotungstatesolutions. Electrochemical quartz crystal microbalance (EQCM), cyclic voltammetry, and chronocoulometry wereused to gain insight into the electrodeposition mechanism. The compositional and structural properties were characterizedfor MoxW1 - xO3 films deposited at intermediate potentials (-0.35 V vs Ag/AgCl) and sintered at 250 
C usingenergy-dispersive spectroscopy, X-ray diffraction, and Raman spectroscopy. These studies reveal that films consistof homogeneously mixed MoxW1 - xO3, with an enriched Mo content ranging in composition from 0.4 < x < 0.7depending upon the mol % Mo present in the deposition solution. Chronoamperometry and spectroelectrochemicalmeasurements were conducted to estimate lithium ion diffusion coefficients and coloration efficiencies for the mixedmetal oxide films in 1 M LiClO4/propylene carbonate. The subtle interplay between structural and compositionalproperties due to the uniform mixing of Mo and W oxide components shows that electrochromic and lithium iontransport properties are moderately enhanced relative to those of single-component WO3 and MoO3 and demonstrateimproved structural stability over pure MoO3 polymorphs during electrochemical cycling.
C usingenergy-dispersive spectroscopy, X-ray diffraction, and Raman spectroscopy. These studies reveal that films consistof homogeneously mixed MoxW1 - xO3, with an enriched Mo content ranging in composition from 0.4 < x < 0.7depending upon the mol % Mo present in the deposition solution. Chronoamperometry and spectroelectrochemicalmeasurements were conducted to estimate lithium ion diffusion coefficients and coloration efficiencies for the mixedmetal oxide films in 1 M LiClO4/propylene carbonate. The subtle interplay between structural and compositionalproperties due to the uniform mixing of Mo and W oxide components shows that electrochromic and lithium iontransport properties are moderately enhanced relative to those of single-component WO3 and MoO3 and demonstrateimproved structural stability over pure MoO3 polymorphs during electrochemical cycling.