钨酸根离子在银、金电极上的电化学行为研究

Electrochemical behavior of tungstate ion on gold and silver electrode

在电化学工作站中以三电极体系研究WO_4^(2-)在金、银电极上的电化学行为.结果表明:298 K时,在0.05 mol/L Na_2WO_4的水溶液体系,研究分析知钨酸根离子在银、金电极上的电化学还原过程不可逆,计算得出钨酸根离子在银、金电极上的转移电子数分别为3、4.以银作阴电极,溶液中钨酸根离子发生WO_4^(2-)+2e→WO_3^(2-)+O和WO_3^(2-)+e→WO_2^-+O电化学反应;以金作阴电极,溶液中钨酸根离子发生WO_4^(2-)+2e→WO_3^(2-)+O和WO_3^(2-)+2e→WO_2^(2-)+O电化学反应.

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 isirreversible 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 ＋2e→WO2 2- ＋O and WO32- ＋e→WO2- ＋O, while WO4 2- ＋2e→WO3 2- ＋O and WO3 2- ＋2e→ WO2 2- ＋O are on gold electrode.