Electrochemical properties of Silver(III) Oxide Cathode and comparing it to Silver(II) Oxide Cathode in Zinc-Sliver Oxide Cells

Silver can be oxided in different oxidation states +1,+2,+3 and more. It can be prepared different compositions. The most popular oxidation states of silver oxide are monovalent (Ag2O), divalent (AgO), and trivalent (Ag2O3)]1]. Because of high specific energy the batteries based on Silver are very regarded [2]. The cathodes containing this oxide has an appropriate potential and doesn’t have an environmental pollution [3]. One of these oxides is Ag2O3, However, it is more unstable than other silver oxides but it conductor of electricity and its impedance less than them]4[ . In this work, Silver(III) oxide and Silver(II) oxide were synthesized, the cathode and the cells that containing silver oxide ware made, then related tests were done to show the identification of compounds and their electrochemical properties. Silver(III) oxide and silver(II) oxide were synthesis by ozonolysis [5] and chemical methods [6], respectively. Sliver nitrate has been used in both methods. The experimental powders were characterized by thermal analysis and FT-IR methods. The presence of a peak at a frequency of 520 𝐶𝑚−1 endorsement the connection between silver and oxygen (figure 1). The results were showed that Ag2O3 and AgO were synthesize by high efficiency (99.67 and 96.7 percent). Silver oxide cathodes Ag2O3 and AgO were prepared by mixing these oxides, Acetylene black and polyvinylidene fluoride. Zinc, Silver oxides and Potassium hydroxide were used as an anode, a cathode and electrolyte, respectively. Some electrochemical tests were done such as open circular potential (OCP) Discharge and potentio Electrochemical Impedance Spectroscopy. The results of OCP were shown the potential of Zn- Ag2O3 and Zn-AgO were 1.8(V) and 1.6(V), 13th Annual Electrochemistry Seminar of Iran Materials and Energy Research Center (MERC), 22- 23 Nov, 2017 133 respectively (figure 2). It means the potential of the Zn- Ag2O3 cell was more than the Zn-AgO cell. Discharge curves were shown the specific energy of these cells at 1C for Zn- Ag2O3 and Zn-AgO were 2.194 and 0.7274 (Wh/g). Impedance curves were shown the resistance of the Zn- Ag2O3 cell was less than Zn-AgO cell.(Figure 3) All of these results were shown the Ag2O3 is the best alternate for AgO. 3O2curve of Ag IR-TF -Figure 1 3 O2Ag -OCP of Zn –Figure 2 and Zn-AgO cell Figure 3 – Impedance curves AgO -and Zn3 O2Ag -of Zncell