关键词: 高价氧化银, Ag3O4, 银锌电池, 碱性电池

Abstract: The electrochemical properties of high-valence silver oxide Ag_(3)O_(4)in alkaline solution were investigated for the first time and the reduction mechanism of Ag_(3)O_(4) was proposed.It can be recognized that Ag_(3)O_(4)consists of_()Ag(Ⅲ) and Ag(Ⅱ)~(*).From the results of voltammetry and XRD experiments it was found that the reduction process of Ag_(3)O_(4) was more complicated.It could be electrochemically reduced through the series reactions of Ag(Ⅲ) →Ag(Ⅱ) →Ag(Ⅰ) →Ag(O) at low discharge rate or Ag(Ⅲ) →Ag(Ⅰ) →Ag(O) at higher discharge rate.And the Ag(Ⅱ)~(*) could be reduced to Ag directly at low potential region.In addition,it is interesting to note that Ag_(3)O_(4) presents the theoretical specific discharge capacity of 553.0mAh/g at high discharge rate,which is 27.8% higher than that of the commonly used cathodic material AgO in zinc/silver oxide battery.Under high discharge rate of 119C,Ag_(3)O_(4) still presents the specific discharge capacity as high as 83% of theoretical value.Ag_(3)O_(4) may have the attractive future for the use in alkaline batteries.