Analysis of H<sub>2</sub>O-induced surface degradation in SrCoO<sub>3</sub>-derivatives and its impact on redox kinetics

Cavallaro, Antonino; Wilson, George E.; Kerherve, Gwilherm; Calì, Eleonora; Bosch, C. A. M. van den; Boldrin, Paul; Payne, D. J.; Skinner, Stephen; Aguadero, Ainara

doi:10.1039/d1ta04174f

Cited by 6 publications

(7 citation statements)

References 56 publications

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“…In all thermal analysis experiments, pure and dry gases were used to limit the effect of water-induced surface phase decomposition. 42 Samples were heated to 1000 °C at a rate of 10 °C min −1 under an argon flow rate of 100 ml min −1 . The oxygen levels were converted from ppm by calibrating the oxygen sensor with known flow rates of 2% oxygen:argon.…”

Section: Methodsmentioning

confidence: 99%

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Wilson

Seymour

Cavallaro

et al. 2022

J. Electrochem. Soc.

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The use of perovskite materials for thermochemical energy storage has been gaining momentum in recent years due to their ability to topotactically exchange large volumes of oxygen, and their chemical and structural flexibility which results in interesting transport and catalytic properties. B-site substituted SrCoO3-δ derivatives have previously been investigated as promising materials for intermediate temperature solid oxide fuel cell cathodes due to the stabilization of a 3C perovskite structure with high electronic and ionic conductivity that allows large oxygen storage capabilities. Here, antimony-substituted strontium cobalt oxides are investigated as new candidate materials for thermochemical energy storage applications. In this work we shed light on the exceptional redox kinetics and cyclability of antimony-substituted variants undergoing oxygen exchange at intermediate temperatures (500 to 800°C). Through the use of density functional theory and isothermal gas atmosphere switching, we demonstrate how the inductive effect of the more electronegative antimony dopants in the Co position, facilitates the kinetics of metal oxide oxidation, whilst hindering reduction reactions. Furthermore, differential scanning calorimetry measurements showed that 10% Sb inclusion in SrCoO3-δ nearly doubled the

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Section: Methodsmentioning

confidence: 99%

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Wilson

Seymour

Cavallaro

et al. 2022

J. Electrochem. Soc.

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“…The presence of water vapour on the surface of the PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+ δ electrode leads to an increase in oxygen vacancies, causing an increase in the electrostatic attraction of cations, which in turn promotes the segregation of surface cation clusters enriched in Ba 2+ and Sr 2+ and the subsequent phase destruction of the electrodes. 184 After thermochemical water splitting on the surface of SrCo 0.95 M 0.05 O 3− δ (M = Mo, Sb) electrodes, phase destruction of the materials under oxidising water conditions at 800 °C was observed with the formation of Sr 6 Co 5 O 15 , SrO, Sr(OH) 2 and CoO, 185 which is unacceptable for electrochemical materials.…”

Section: Characterization Of Surface Segregation: Approachesmentioning

confidence: 99%

Segregation and interdiffusion processes in perovskites: a review of recent advances

Porotnikova,

Osinkin

2024

J. Mater. Chem. A

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“…For example, in SrCo 0.95 Cr 0.05 O 3-δ , 779.98 and 795.08 eV correspond to Co 3+ and 781.08 and 796.48 eV refer to Co 2+ . 12 In Figure 4d, the O 1s spectrum was fitted with three peaks of O lat (529.68 eV for x = 0.05), O ads (531.38 eV for x = 0.05), and H 2 O (533.08 eV for x = 0.05), which, respectively, respond to the lattice oxygen on the surface, oxygen defects, and adsorbed hydroxyl groups with water molecules. 9 The contributions of three oxygen species were quantitatively analyzed (see Table 2).…”

Section: Preparation Of Supercapacitor Devicementioning

confidence: 99%

Cr-Substituted SrCoO_3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor

He,

Zhou,

et al. 2024

Inorg. Chem.

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Developing high-performance electrodes for flexible antifreezing energy storage devices has been a significant challenge with the increasing demand for portable components. In this work, Cr-substituted SrCoO 3-δ perovskites were first proposed as potential low-temperature supercapacitor electrode materials. The high-valence Cr 6+ ([Ne]3s 2 3p 6 ) substitution favors a high-spin state of Co ions with enhanced electronic repulsion effect, ultimately forming a stable cubic structure with high conductivity. Accordingly, the modification strategies of SrCoO 3 through the p6 configuration cation substitution have been improved. As a result, the asymmetric SrCo 0.95 Cr 0.05 O 3-δ @CC//PPy@CC device exhibited a high energy density of 44.90 Wh kg −1 at 902.01 W kg −1 and maintained a 95.8% specific capacitance after 10,000 cycles, demonstrating an ultralong cyclic stability. The dramatically improved electrochemical performance was attributed to the stabilized crystal structure, increased oxygen vacancy, and accelerated oxygen diffusion rate. Furthermore, a quasi-solid-state supercapacitor with ethylene glycol (EG)-modified KOH/PVA organohydrogel electrolyte was developed through an advance in situ-integrated strategy. After bending at 180°for 1000 cycles, only a 9.7% capacity decay was observed. Even under −40 °C, the supercapacitor has a large energy density of 46.94 μWh cm −2 . The present work represents the initial investigation into utilizing perovskite materials for antifreezing energy storage device, thereby confirming their potential application as low-temperature electronic components.

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Analysis of H₂O-induced surface degradation in SrCoO₃-derivatives and its impact on redox kinetics

Abstract: Substituted SrCoO3 perovskites have been proposed as promising mixed ionic electronic conductors for a range of applications including intermediate temperature solid oxide fuel cells (IT-SOFC), electrolysers and thermochemical water spliting...

Cited by 6 publications

References 56 publications

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Segregation and interdiffusion processes in perovskites: a review of recent advances

Cr-Substituted SrCoO_3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor

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Analysis of H2O-induced surface degradation in SrCoO3-derivatives and its impact on redox kinetics

Abstract: Substituted SrCoO3 perovskites have been proposed as promising mixed ionic electronic conductors for a range of applications including intermediate temperature solid oxide fuel cells (IT-SOFC), electrolysers and thermochemical water spliting...

Cited by 6 publications

References 56 publications

Fast Redox Kinetics in SrCo1−xSbxO3−δPerovskites for Thermochemical Energy Storage

Fast Redox Kinetics in SrCo1−xSbxO3−δPerovskites for Thermochemical Energy Storage

Segregation and interdiffusion processes in perovskites: a review of recent advances

Cr-Substituted SrCoO3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor

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Analysis of H₂O-induced surface degradation in SrCoO₃-derivatives and its impact on redox kinetics

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Fast Redox Kinetics in SrCo_1−xSb_xO_3−δPerovskites for Thermochemical Energy Storage

Cr-Substituted SrCoO_3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor