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Cathodic deposition of molybdenum and vanadium mixed oxyhydroxide films from V-substituted polymolybdophosphate

Electrochimica acta Volume 51 Issue 2 Page 274-280
published_at 2005
Title
Cathodic deposition of molybdenum and vanadium mixed oxyhydroxide films from V-substituted polymolybdophosphate
Creators Nakayama Masaharu
Creators Komatsu Hiroyuki
Creators Ozuka Shotaro
Creators Ogura Kotaro
Creator Keywords
polymolybdovanadophosphate Mo-V mixed oxide electrodeposition X-ray photoelectron spectroscopy
We report a new electrochemical route for fabricating molybdenum and vanadium mixed oxyhydroxide films on Au electrode from Keggin-type vanadium-substituted polymolybdophosphate. The process involves a potentiodynamic reduction of aqueous 9-molybdo(VI)-3-vanadophosphosphate(V) ([Pmo_9V_3O_<40>]^<6->) in the potential region between 0 and -0.7 V versus Ag/AgCl. The resulting MoV oxyhydroxide film electrode gave a stable redox behavior in Na_2SO_4 electrolyte of pH 3. X-ray photoelectron spectroscopy revealed that this results from oxidation/reduction of Mo^<5+>/Mo^<6+> in the film which accompanies extraction/insertion of protons for charge compensation. The deposited V ions remained in the film upon repetitive potential cycling without affecting their oxidation state. Voltammetric data in the presence of sodium nitrite showed electrocatalytic activity of the Mo-V oxyhydroxide toward the electroreduction of nitrite.
Languages eng
Resource Type journal article
Publishers Elsevier
Date Issued 2005
File Version Not Applicable (or Unknown)
Access Rights metadata only access
Relations
[ISSN]0013-4686
[NCID]AA00633261
https://doi.org/10.1016/j.electacta.2005.04.025
[isVersionOf] [URI]http://www.sciencedirect.com/science/journal/00134686
Schools 大学院理工学研究科(工学)