电化学石英晶体微天平对银电极氧化还原过程的研究

建立了电化学石英晶体微天平（ＥＱＣＭ）－循环伏安联用技术，并以此研究了碱性溶液中银的氧化还原行为。在伏安扫描的同时，现场记录电极表面的质量变化，得到与电流－电势曲线相对应的质量－电势谱。结果表明本体Ａｇ２Ｏ形成之前银溶解和生成表面化合物的过程共存，阴极方向的氧化峰确定是ＡｇＯ的继续生成。在ＡｇＯ还原为Ａｇ２Ｏ的阶段观察到了异常的质量变化，并进行了讨论。

Studies on the Redox Process of Silver Using Electrochemical Quartz Crystal Microbalance

Combined with cyclic voltammetry,the Electrochemical Quartz Crystal Microbalance(EQCM) technique was used to study the redox behavior of silver in an alkaline solution.By insitu recording the change of mass in the process of polarization,the dependence of mass on voltage in accordance with the cyclic voltammogram was obtained.Before the formation of the bulk of Ag2O,a process of competition between the dissolution and the formation of AgOH(or hydrous Ag2O) surface-layer was detected.A little unexpected increase of mass was found at the beginning of the reduction of AgO to Ag_2O,and the exceptional increase was discussed in terms of formation of a surface-compound and the change in the double layer structure.A comparison was made between the measuring time derivative of the frequency and the calculating value based on current.According to this comparison,we valued the effectivity of EQCM in the study of the process of phase transfermation.