EQCM measurement of Ag (I) /Ag reaction in an amide-type room-temperature ionic liquid

Electrodeposition of silver was investigated using an impedance technique (separately excited, passive technique) electrochemical quartz crystal microbalance (EQCM) in a room-temperature ionic liquid. The mass changes during silver deposition and dissolution were observed with the current efficiencies of nearly 100% during potential sweep, constant potential step, and constant current step experiments. The product of the viscosity and density of the electrolyte near the electrode, ν_Lρ_L, can be estimated by the resonance resistance, which can be monitored simultaneously with the resonance frequency. The change in the ν_Lρ _L value during silver deposition was consistent with the change in the calculated concentration of Ag(I) near the electrode. During the outer-sphere electron-transfer reaction between ferrocenium and ferrocene, no significant changes in the mass and the L_{ρ L} value were observed.