Investigation of Underpotential Deposition of Lead on Rotating Silver Disk Electrode by Chronocoulometry / 分析化学

ABSTRACT

The monolayer charge of lead underpotential deposition (UPD) was studied by chronocoulometry. On the rotating silver disk electrode (Ag-RDE), the monolayer charge of UPD lead could reaches steady state at different Pb2+ concentration levels by changing reduction time of UPD Pb2+ . A supporting electrolyte solution of 0.01 mol/L HNO3 + 0.01 mol/L NaCl was used. The steady state charge measured was 393.3 μC/cm2, which corresponded to a surface cover of 2 × 10-9 mol/cm2 Pb2+ on the electrode surface.