Ionic conductivity in AgI1−xClx

Abstract

Experimental results are presented for the ionic conductivity of AgI1−xClx (0 < x < 0.1) in the temperature range 60 to 200 °C. It is found that the substitution of Cl− ions for I− ions in AgI leads to a substantial decrease in the temperature for β–α phase transition and also a large increase in the ionic conductivity in β‐phase. The effect of Cl− ions is more pronounced than that of Br− ions. This result is consistent with Shahi and Wagner's conjecture. A simple model is given which can explain the effect of Cl− ions.

A fast ion conducting mixed glass system: x[0.75AgI:0.25AgCl]: (1 - x)[]. Transport property and battery discharge characteristic studies

“…The DTA curve for the quenched optimum composition, shown in figure 3, contains two endothermic peaks at temperatures about 129 • C and about 168 • C. The first endotherm corresponds to a β → α-like transition (above about 135 • C) of the host compound [14], albeit at a slightly reduced temperature (129 • C). The decrease in the β → α transition temperature has been reported earlier for AgI as well as for the new host when complexed with other compound(s) [19][20][21]. The first peak, which is substantially smaller in size than the β → α transition peak of the pure host [14], indicates the fractional presence of unstabilized/unreacted host in the system.…”

Specifically Adsorbed Anions Enhance CO2 Electrochemical Reduction to CO over a Gallium Catalyst in Organic Electrolytes

“…This speculation is verified by the Tafel plot measurements results. Meanwhile, Cl – has a large radius (0.181 nm), which can effectively hinder proton adsorption and suppress proton reduction. , Hence, CO 2 was highly reduced to CO in Cl – -ion-containing electrolytes.…”

Inhibiting Hydrogen Evolution using a Chloride Adlayer for Efficient Electrochemical CO2 Reduction on Zn Electrodes

“…14,25 It is well-known that the strength of the covalent bond between two elements is negatively related to the difference in their electronegativities. Br − ion, exhibiting a greater adsorption strength to form covalent bond with the Zn atom (electronegativity: Zn 1.60, Br 2.96, and Cl 3.16) 26 and larger ion radius (0.195 nm), 24 was chosen to further prove the adsorption impact in inhibiting HER reaction and promoting CO 2 reduction. As seen in Figure 4a, after replacing Cl − with Br − , a slight increase in the current density under CO 2saturated conditions were observed; however, the current density under the N 2 atmosphere decreased remarkably.…”

“…The adlayer of Cl – ions would increase the negative charge on the Zn electrode thus facilitating the electron transfer to the CO 2 molecule to stabilize the CO 2 – radical. In addition, the large radius of the Cl – ion (0.181 nm) effectively blocked the adsorption of protons thus reducing HER side reactions. Indeed, it was well-known that during CO 2 reduction on Ag or Cu electrodes the formation of Ag–X or Cu–X (X stands for halogen ions) layers facilitated the electron transfer to the inert CO 2 molecule, while inhibiting the proton adsorption. , …”