Premium
Anodic and cathodic process of hypophosphite on a Ni‐Ag electrode
Author(s) -
Zeng Yue,
Yu ShangCi,
Li ZeLin,
Zhou ShaoMin
Publication year - 2000
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20000180509
Subject(s) - hypophosphite , chemistry , phosphine , raman spectroscopy , nickel , inorganic chemistry , sodium hypophosphite , electrosynthesis , photochemistry , catalysis , electrode , electrochemistry , organic chemistry , electroplating , physics , layer (electronics) , optics
The reduction and the oxidation of hypophosphite on a Ni‐Ag electrode have been studied to provide the information about the phosphorus incorporation mechanisms during the electro‐less deposition and the electrodeposition of Ni‐P alloys. In the electrooxidation process, an absorbency band around 240 nm, which was ascribed to tbe formation of an intermediate PHO 2 , was observed by in situ UV‐Vis subtractive reflectance spectroscopy. Accordingly, the electrooxidation of hypophosphite might undergo an H abstraction of hypophosphite from the PH bond to form the phosphorus‐centred radical PHO 2 , which was subsequently electrooxidized to the final product, phosphite. In the reduction process Ni‐phosphine compound N‐(PH 3 ), was observed by in situ surface Raman spectroscopy. The results from the Raman experiments show that, in the NiSO 4 ‐free solution, hypophosphite was reduced only to Ni‐phosphine compound, while in the case where NiSO 4 coexisted in tbe solutions, the Ni‐phosphine compound, as an intermediate, was oxidised by Ni 2+ to elemental phosphorus in alloys with nickel acting as the catalyst.