Electrochemical behavior of tungstate ion on gold and silver electrode

Electrochemical behaviors of tungstate ion on gold, silver electrode were studied by three-electrode system in electrochemical workstation. The results show that WO₄^2- electrochemical reduction process is irreversible on silver and gold electrode in 0.05 mol/L Na₂WO₄ aqueous system at 298 K. The numbers of transferred electrons of WO₄^2- on silver and gold electrode are 3 and 4, respectively. The reactions of tungstate ion on silver eletrode are WO₄^2-+2e→WO₃ ^2-+O and WO₃ ^2-+e→WO₂ ^- +O, while WO₄^2-+2e→WO₃^2-+O and WO₃ ^2-+2e→WO₂^2-+O are on gold electrode.