Electrochemical oxygen intercalation into oxide networks

Dependences on Heating Conditions and Applicabilities as an Additive for ECIA of Sr1-xBaxFe3+1-ΤFe4+ΤO3-yFerrite System

“…In air the powder samples, SB0-A : Sr 1 19,20 for perovskite-type compounds, the X-ray powder patterns (Figure 1) of the solid solutions of A series were indexed 21 reasonably by referring to the JCPDS data (#28-1227) and the samples of A series were found to have cubic symmetries (SB0-A : a = 3.869 Å (standard deviation; s = 9.12 × 10 (pressure = 0.2 atm)). After the heat treatment at 1073 K in N 2 stream for 48 hours, the amount of Fe 4+ ions decreased almost to 0, and all the samples of A series lost their oxygen (Figure 3), i.e., all the y values approached 0.5, which corresponds to Brownmillerite type.…”

“…Perovskite-related oxides have been well known to have peculiar characteristics, so it has been proposed that they can be used as sensors or electrodes for electrocatalysts [1][2][3][4][5][6] and photochemistry. 7 It has been observed that their properties (especially amounts of oxygen content) depend on the preparation conditions such as heating in air, oxygen or vacuum, maximum heating temperature, and cooling rate.…”

“…In recent studies on various perovskite-related materials including K 2 NiF 4 -type compounds, 12 electrical conducting inorganic adhesives (ECIA) for high temperature containing either K 2 NiF 4 -type oxides like Sr 1 ) of -2.4 (at 283 K)~-0.7(at 573 K) and -2.8 (at 283 K)~-1.1 (at 573 K). Adding them into inorganic adhesive (AB-11, made from the reaction of the mixtures of SiC, ZnO 2 and NaOH) with several composition, various ECIAs for high temperature were prepared and, among them, ECIA-3 12 Considering such previous works, this study was aimed at performing synthesis and heat-treatments of the Sr 1-xBa x FeO 3-y system (x = 0.0, 0.1, 0.2 and 0.3) under various conditions (in air, in O 2 (1 atm) and in N 2 (1 atm)), at checking whether it is possible to control the nonstoichiometry of the Sr 1-x Ba x FeO 3-y system and eventually at investigating their applicability as additives for ECIAs for electrolytic oxygen evolution electrode 3,4 and solid oxide fuel cell.…”

Transition-metal-oxide based functional thin-film device using leakage-free electrolyte

“…15) Thus, the chemical modification of TMOs is the most reasonable way to demonstrate the functional switching devices, but the control of oxygen off-stoichiometry or protonation of TMOs is not typically utilized for solid-state devices because of imperative high-temperature heat treatment under an oxidative/reductive atmosphere. 16)20) Meanwhile, the electrochemical redox reaction by the electrolysis in liquid electrolyte has been a facile method to achieve the chemical modification at room temperature (RT), 21) but such a device has not been realized because of the lack of a liquid-leakage-free electrolyte.…”

Reversibly Switchable Electromagnetic Device with Leakage‐Free Electrolyte

“…[11−13] The other is the use of an electrochemical redox reaction in a liquid electrolyte containing an alkali hydroxide as a salt at room temperature (RT). [14] The former method is not preferable for devices operating at RT since high-temperature heating (>500 °C) is commonly required. Although the latter method would be reasonable for RT applications, the device cannot be used without sealing due to the leakage of the liquid electrolyte.…”