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In situ surface Raman investigation on induced-codeposition of an Fe–Mo alloy

1998; Elsevier BV; Volume: 455; Issue: 1-2 Linguagem: Inglês

10.1016/s0022-0728(98)00148-x

1873-2569

Zhen-Jiang Niu, Shi-Bing Yao, Shaomin Zhou,

Electrochemical Analysis and Applications

In situ surface Raman spectroscopy was used for investigation of induced-electrodeposition of Fe–Mo alloy. The results of Raman spectra showed that in the electrolyte without FeSO4, the Mo(VI) species reduction occurred at a potential more negative than −0.5 V (vs SCE) as indicated by the appearance of a new peak (ca. 730 cm−1) which corresponded mainly to a Mo(IV) species.The broadening of the peak was attributed to a Mo(IV) species deposited on the electrode surface existing in the form of a 'molybdenum blue' compound. This compound was not further reduced even at the potential up to −1.9 V, while in the case where FeSO4 coexisted in the electrolyte, the formation of the 'molybdenum blue' became easier and the peak blue shifted to 740 cm−1. Moreover, this peak faded away gradually in the potential region from −1.5 to −1.9 V and a bright Fe–Mo alloy deposited on the electrode surface was observed. These results showed that in situ surface Raman spectroscopy was a useful tool in the study of the induced-electrodeposition of this alloy.