ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
XPS was employed to detect the surface species deposited on an activated platinum electrode following cathodic polarization in deaerated 0.1 M (NH4)6Mo7O24 · 4H2O solution. At - 160 mV (saturated calomel electrode, SCE), evidence was found of the possible dissociation of polymolybdate to molybdate with subsequent surface adsorption. At -340 mV (SCE) molybdate was observed to reduce to Mo5+ in the form of Mo2O5. At - 540 mV (SCE), Mo4+ was the stable species, existing in the form of tetravalent oxyhydroxide MoO(OH)2 according to XPS analysis. No further reduction from Mo4+ to lower-valent states was observed when cathodically polarized to - 900 mV (SCE). Mo2O5 was found to be unstable in air, oxidizing readily to MoO3.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740140114
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