Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

An Electrochemical System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues

Version 1 : Received: 29 March 2021 / Approved: 30 March 2021 / Online: 30 March 2021 (13:13:10 CEST)

A peer-reviewed article of this Preprint also exists.

Hayashi, H.; Suzuki, T. A Reaction–Diffusion–Reaction System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues. Appl. Sci. 2021, 11, 5000. Hayashi, H.; Suzuki, T. A Reaction–Diffusion–Reaction System for Forming Periodic Precipitation Bands of Cu-Fe-Based Prussian Blue Analogues. Appl. Sci. 2021, 11, 5000.

Journal reference: Appl. Sci. 2021, 11, 5000
DOI: 10.3390/app11115000

Abstract

We propose a novel electrochemical system to form precipitation patterns of Cu-Fe-based Prussian blue analogues (Cu-Fe PBA) in agarose gels, using an applied voltage to produce reactant ions. The spatiotemporal evolution, spatial distribution, and crystallite morphologies of the precipitates were investigated by visual inspection, Fe Kα intensity distribution measurements, and optical and scanning electron microscope observations. The precipitation patterns and their evolution depended on the applied voltage. Multicolored periodic precipitation bands were stochastically formed under cyclic alternating voltage (4 V for 1 h and then 1 V for 4 h per cycle). The distances between adjacent bands were randomly distributed (0.30 ± 0.25 mm). The sizes and shapes of the crystallites generated in the gel were position-dependent. Almost cubic but fairly irregular crystallites (0.1–0.8 μm) were formed in the periodic bands, whereas definitely cube-shaped crystallites (1–3 μm) appeared close to the anode. These cube-like reddish-brown crystallites were assigned to Cu-FeII PBA. In some periodic bands, plate-like blue crystallites (assigned to Cu(OH)2) were also present. Future issues for applications of the observed periodic banding were discussed.

Keywords

Periodic banding; Prussian blue analogues; Electrochemical system

Subject

PHYSICAL SCIENCES, Acoustics

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