Issue 18, 2024

Systematic study of ionic conduction in silver iodide/mesoporous alumina composites 2: effects of silver bromide doping

Abstract

In our preceding paper (Y. Fukui et al., Phys. Chem. Chem. Phys., 2023, 25, 25594–25602), we reported a systematic study of the Ag+-ion conducting behaviour of silver iodide (AgI)-loaded mesoporous aluminas (MPAs) with different pore diameters and AgI-loading ratios. By optimising the control parameters, the Ag+-ion conductivity has reached 7.2 × 10−4 S cm−1 at room temperature, which is more than three orders of magnitude higher than that of bulk AgI. In the present study, the effect of silver bromide (AgBr)-doping in the AgI/MPA composites on Ag+-ion conductivity is systematically investigated for the first time, using variable-temperature powder X-ray diffraction, differential scanning calorimetry, and electrochemical impedance spectroscopy measurements. The AgBr-doped AgI/MPA composites, AgI-AgBr/MPA, formed a homogeneous β/γ-AgI-structured solid solution (β/γ-AgIss) for the composites with AgBr ≤ 10 mol%, above which the composites underwent a phase separation into β/γ-AgIss and face-centred cubic AgBr solid solutions (AgBrss). The onset temperature of the exothermic peaks attributed to the transition from α-AgI-structured solid-solution phase to β/γ-AgIss or AgBrss decreased with increasing the AgBr-doping ratio. The room-temperature ionic conductivity of the AgI–AgBr/MPA composites exhibited a volcano-type dependence on the AgBr-doping ratio with the highest value (1.6 × 10−3 S cm−1) when the AgBr content was 10 mol%. This value is more than twice as high as that of the highest conducting AgI/MPA found in our previous study.

Graphical abstract: Systematic study of ionic conduction in silver iodide/mesoporous alumina composites 2: effects of silver bromide doping

Supplementary files

Article information

Article type
Paper
Submitted
21 Feb 2024
Accepted
17 Apr 2024
First published
17 Apr 2024
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2024,26, 13675-13682

Systematic study of ionic conduction in silver iodide/mesoporous alumina composites 2: effects of silver bromide doping

Y. Fukui, Y. Yoshida, H. Kitagawa and Y. Jikihara, Phys. Chem. Chem. Phys., 2024, 26, 13675 DOI: 10.1039/D4CP00744A

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