The electrodeposition mechanism of Ni-Mo alloys from ammoniacal citrate solution was investigated by means of steady-state polarization curves, impedance measurement and XPS analysis. XPS analysis showed the existence...The electrodeposition mechanism of Ni-Mo alloys from ammoniacal citrate solution was investigated by means of steady-state polarization curves, impedance measurement and XPS analysis. XPS analysis showed the existence of tetravalent molybdenum corresponding to MoO2 on the surface of some deposits. Probably, as an intermediate product, MoO2 was reduced by atomic hydrogen adsorpted on nickel. Electrochemical investigation indicated that [Nicit(NH3)2]-ion is the electro-active species of nickel, though nickel ion ekist mainly as[Nicit(NH3)3]- in ammoniacal citrate solution.展开更多
Codeposition mechanism of phosphorus with nickel on an Ni Ag alloy electrode has been investigated by means of in situ surface enhanced Raman spectroscopy(SERS) and electrochemical method to obtain new information abo...Codeposition mechanism of phosphorus with nickel on an Ni Ag alloy electrode has been investigated by means of in situ surface enhanced Raman spectroscopy(SERS) and electrochemical method to obtain new information about the phosphorus incorporation mechanism during electrodeposition of Ni P alloys.The intermediate,Ni(PH3)n,in the electrodeposition of Ni P alloy was detected with in situ surface Raman spectroscopy for the first time. The experimental results showed that in the solution without NiSO4,hypophosphite was reduced only to Ni phosphine compound,while in the case where NiSO4 coexisted in the solution,the Ni phosphine compound,as an intermediate,was oxidized by Ni2＋to elemental phosphorus in alloys with nickel acting as the catalyst.展开更多
Anisaldehyde was synthesized and charcaterized.Rate constants of oxidation reaction of anethole to anisaldehyde by Ceric Sulfate at different temperature（15-35℃）were measured.The rate equation,d/dt=k[Ce4+]and appar...Anisaldehyde was synthesized and charcaterized.Rate constants of oxidation reaction of anethole to anisaldehyde by Ceric Sulfate at different temperature（15-35℃）were measured.The rate equation,d/dt=k[Ce4+]and apparent activation energy（51.12 KJ/mol）of the reaction were found.展开更多
文摘The electrodeposition mechanism of Ni-Mo alloys from ammoniacal citrate solution was investigated by means of steady-state polarization curves, impedance measurement and XPS analysis. XPS analysis showed the existence of tetravalent molybdenum corresponding to MoO2 on the surface of some deposits. Probably, as an intermediate product, MoO2 was reduced by atomic hydrogen adsorpted on nickel. Electrochemical investigation indicated that [Nicit(NH3)2]-ion is the electro-active species of nickel, though nickel ion ekist mainly as[Nicit(NH3)3]- in ammoniacal citrate solution.
文摘Codeposition mechanism of phosphorus with nickel on an Ni Ag alloy electrode has been investigated by means of in situ surface enhanced Raman spectroscopy(SERS) and electrochemical method to obtain new information about the phosphorus incorporation mechanism during electrodeposition of Ni P alloys.The intermediate,Ni(PH3)n,in the electrodeposition of Ni P alloy was detected with in situ surface Raman spectroscopy for the first time. The experimental results showed that in the solution without NiSO4,hypophosphite was reduced only to Ni phosphine compound,while in the case where NiSO4 coexisted in the solution,the Ni phosphine compound,as an intermediate,was oxidized by Ni2＋to elemental phosphorus in alloys with nickel acting as the catalyst.
文摘Anisaldehyde was synthesized and charcaterized.Rate constants of oxidation reaction of anethole to anisaldehyde by Ceric Sulfate at different temperature（15-35℃）were measured.The rate equation,d/dt=k[Ce4+]and apparent activation energy（51.12 KJ/mol）of the reaction were found.
