| Autor: |
Komatsu, Hiroyuki, Ozuka, Shotaro, Ogura, Kotaro |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Electrochimica acta. 51(2):274-280 |
| Popis: |
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_]^) 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^/Mo^ 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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