Unintended consequence of topochemical reduction of 
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 to 
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: Design of infinite layered oxides

Ferreira, Timothy; Acharya, Shree Ram; Li, Ying Wai; Parker, David; Sefat, Athena S.; Cooper, Valentino R.

doi:10.1103/physrevmaterials.5.123401

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…Unlike the peak at y = 3, which is insensitive to x , the peak position of y = 2 changes when x exceeds 0.5 (Figure b). For y = 2, the DP structure is stable when x ≤ 0.5, while the IL structure − is stable when x > 0.5. Figure c shows the lattice parameters extracted from the XRD patterns.…”

Section: Resultsmentioning

confidence: 99%

Solid-State Electrochemical Thermal Transistors with Strontium Cobaltite–Strontium Ferrite Solid Solutions as the Active Layers

Bian

Yang

Yoshimura

et al. 2023

ACS Appl. Mater. Interfaces

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Thermal transistors have potential as thermal management devices because they can electrically control the thermal conductivity (κ) of the active layer. Recently, we realized solid-state electrochemical thermal transistors by utilizing the electrochemical redox reaction of SrCoO y (2 ≤ y ≤ 3). However, the guiding principle to improve the on/off κ ratio has yet to be clarified because the κ modulation mechanism is unclear. This study systematically modulates κ of SrCo1–x Fe x O y (0 ≤ x ≤ 1, 2 ≤ y ≤ 3) solid solutions used as the active layers in solid-state electrochemical thermal transistors. When y = 3, the lattice κ of SrCo1–x Fe x O y is ∼2.8 W m–1 K–1 and insensitive to x. When x = 0 and y = 3, κ increases to ∼3.8 W m–1 K–1 due to the contribution of the electron κ. When y = 2, κ slightly depends on the ordered atomic arrangement. Materials that are high electrical conductors with highly ordered lattices when the transistor is on but are electrical insulators with disordered lattices when the transistor is off should be well-suited for the active layers of solid-state electrochemical thermal transistors.

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Section: Resultsmentioning

confidence: 99%

Solid-State Electrochemical Thermal Transistors with Strontium Cobaltite–Strontium Ferrite Solid Solutions as the Active Layers

Bian

Yang

Yoshimura

et al. 2023

ACS Appl. Mater. Interfaces

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“…Sr 3 Fe 2 O 7 and SrFeO 3 powders were synthesized by a solid-state reaction using α-iron oxide and strontium carbonate as precursors ( 33 , 34 ). A stoichiometric mixture of α-iron oxide (α-Fe 2 O 3 , Shanghai Aladdin Biochemical Technology Co., Ltd., 99.8%) and strontium carbonate (SrCO 3 , Bide Pharmatech Ltd., 99%) was fully ground and spread out in an alumina crucible.…”

Section: Methodsmentioning

confidence: 99%

Thermal suppression of charge disproportionation accelerates interface electron transfer of water electrolysis

Lu,

Du,

Yan

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The sluggish electron transfer kinetics in electrode polarization driven oxygen evolution reaction (OER) result in big energy barriers of water electrolysis. Accelerating the electron transfer at the electrolyte/catalytic layer/catalyst bulk interfaces is an efficient way to improve electricity-to-hydrogen efficiency. Herein, the electron transfer at the Sr 3 Fe 2 O 7 @SrFeOOH bulk/catalytic layer interface is accelerated by heating to eliminate charge disproportionation from Fe 4+ to Fe 3+ and Fe 5+ in Sr 3 Fe 2 O 7 , a physical effect to thermally stabilize high-spin Fe 4+ (t 2g 3 e g 1 ), providing available orbitals as electron transfer channels without pairing energy. As a result of thermal-induced changes in electronic states via thermal comproportionation, a sudden increase in OER performances was achieved as heating to completely suppress charge disproportionation, breaking a linear Arrhenius relationship. The strategy of regulating electronic states by thermal field opens a broad avenue to overcome the electron transfer barriers in water splitting.

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Monitoring the formation of infinite-layer transition metal oxides through in situ atomic-resolution electron microscopy

Xing,

Kim,

Kang

et al. 2024

Nat. Chem.

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Unintended consequence of topochemical reduction of SrFeO3 to SrFeO2 : Design of infinite layered oxides

Cited by 3 publications

References 51 publications

Solid-State Electrochemical Thermal Transistors with Strontium Cobaltite–Strontium Ferrite Solid Solutions as the Active Layers

Solid-State Electrochemical Thermal Transistors with Strontium Cobaltite–Strontium Ferrite Solid Solutions as the Active Layers

Thermal suppression of charge disproportionation accelerates interface electron transfer of water electrolysis

Monitoring the formation of infinite-layer transition metal oxides through in situ atomic-resolution electron microscopy

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