Promotion of the oxygen evolution reaction via the reconstructed active phase of perovskite oxide

Jo, Hyoi; Yang, Young Soon; Jeong, Donghwi; Kim, Guntae; Joo, Se Hun; Kim, Yu Jin; Zhang, Linjuan; Liu, Ze; Wang, Jianqiang; Kwak, Sang Kyu

doi:10.1039/d1ta08445c

Cited by 23 publications

(7 citation statements)

References 39 publications

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“…5e). The preparation method and specific properties of these materials are displayed in Table S2 30,49,59,[61][62][63][64][65][66][67][68][69] .…”

Section: Resultsmentioning

confidence: 99%

Microwave Shock Process for Rapid Synthesis of 2D Porous La0.2Sr0.8CoO3 Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Hu¹,

Wei²,

Xian³

et al. 2023

Acta Physico Chimica Sinica

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The oxygen evolution reaction (OER) is considered the rate-limiting step in electrochemical water splitting, and has been widely used to solve energy and environmental issues. Perovskite oxides (ABO3) exhibit good OER activity, owing to their tunable electronic structures and highly flexible elemental compositions. However, the preparation of perovskite oxides usually requires long exposure to high temperatures, resulting in metal agglomeration and undesirable effects on intrinsic activity. Vapor-phase microwave technology can significantly reduce the duration of heat treatment and subsequently reduce the associated carbon emissions. This technology not only addresses the growing demand for carbon-neutral processes but also enables increased control of the synthesis to avoid undesirable agglomeration of the product. In this study, a 2D porous La0.2Sr0.8CoO3 perovskite was rapidly prepared using a microwave shock method. The rapid entropy increase associated with the microwave process can effectively expose abundant active sites in the La0.2Sr0.8CoO3 structure. Furthermore, the high-energy microwave shock process can precisely introduce Sr 2+ into the lattice of LaCoO3, increasing the number of oxygen vacancies by increasing the oxidation state of Co. The oxygen vacancies introduced by replacing La with Sr can considerably improve the intrinsic catalytic activity of the material. For the OER in alkaline electrolytes, the prepared La0.2Sr0.8CoO3 catalyst displayed an excellent overpotential of 360 mV at 10 mA•cm −2 and a Tafel slope of 76.6 mV•dec −1 . After a long-term cycle test of 30000 s, 97% of the initial current density was maintained. This study presents a facile and rapid strategy for the synthesis of highly active 2D perovskites.

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“…5e). The preparation method and specific properties of these materials are displayed in Table S2 30,49,59,[61][62][63][64][65][66][67][68][69] .…”

Section: Resultsmentioning

confidence: 99%

Microwave Shock Process for Rapid Synthesis of 2D Porous La0.2Sr0.8CoO3 Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Hu¹,

Wei²,

Xian³

et al. 2023

Acta Physico Chimica Sinica

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“…Figure 4e is the fitting result of the current and sweep speed measured by the CV method, and the fitted slope value corresponds to the electrochemistry C dl of the material. ECSA is proportional to C dl , [ 29 ] so the relative magnitude of ECSA can also be inferred from the fitting results. Obviously, BCFI has a larger ECSA, which is beneficial to the occurrence of OER.…”

Section: Resultsmentioning

confidence: 99%

Iridium‐Doped 10H‐Phase Perovskite BaCo₀_.₈Fe₀_.₁₅Ir₀_.₀₅O₃_–δ as an Efficient Oxygen Evolution Reaction Catalyst

Liu

Luo

et al. 2022

Chin. J. Chem.

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Comprehensive Summary Designing low‐cost and high‐performance catalysts of electrocatalytic oxygen evolution reaction (OER) has always been one of the hot topics in current research. Hexagonal perovskite materials show great application potential in this field. Here, we synthesized 5% Iridium (Ir)‐doped hexagonal phase perovskite BaCo0.8Fe0.15Ir0.05O3–δ (BCFI). Using the Rietveld method to refine the structure, combining with the spherical aberration corrected high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) atomic imaging, we found that BCFI is a ten‐layer hexagonal (10H) structure, which belongs to the P true 6¯m2 space group. In addition, BCFI shows excellent OER catalytic effect and good stability in 1 mol/L KOH solution, and the overpotential reaches 294 mV at a current density of 10 mA cm–2. The reduction of Cobalt (Co) valence state induced by Ir doping significantly enhances the OER activity of BCFI. Meanwhile, density functional theory (DFT) calculations show that the 2p‐band center of oxygen (O) in BCFI is closer to the Fermi level than that in undoped BaCo0.8Fe0.2O3‐δ (BCF), which is beneficial to the OER. This work reveals a novel 10H‐BCFI material with excellent OER performance, and provides a basis for the design of hexagonal perovskite materials in OER and other energy conversion fields.

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“…The overlap (high degree of hybridization and covalency) is intimately associated with the enhanced OER properties. 87 It is worth mentioning that the TG analysis of 18 perovskites indicates that introducing partial Zn substitution at the B-site increases the proton uptake, whereas Co substitution decreases the proton uptake. 88 The doping tendency reveals that the proton uptake depends on the alkalinity of the oxide ion.…”

Section: Air Electrodementioning

confidence: 99%

A review of progress in proton ceramic electrochemical cells: material and structural design, coupled with value-added chemical production

Wang,

Ling,

Wang

et al. 2023

Energy Environ. Sci.

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Promotion of the oxygen evolution reaction via the reconstructed active phase of perovskite oxide

Abstract: Developing a stable and highly efficient electrocatalyst for oxygen evolution reactions (OERs) is critical for renewable, safe, and emission-free energy technologies. Perovskite oxides with flexible and tunable electronic structures as...

Cited by 23 publications

References 39 publications

Microwave Shock Process for Rapid Synthesis of 2D Porous La<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3</sub> Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Microwave Shock Process for Rapid Synthesis of 2D Porous La<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3</sub> Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Iridium‐Doped 10H‐Phase Perovskite BaCo₀_.₈Fe₀_.₁₅Ir₀_.₀₅O₃_–δ as an Efficient Oxygen Evolution Reaction Catalyst

A review of progress in proton ceramic electrochemical cells: material and structural design, coupled with value-added chemical production

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Promotion of the oxygen evolution reaction via the reconstructed active phase of perovskite oxide

Abstract: Developing a stable and highly efficient electrocatalyst for oxygen evolution reactions (OERs) is critical for renewable, safe, and emission-free energy technologies. Perovskite oxides with flexible and tunable electronic structures as...

Cited by 23 publications

References 39 publications

Microwave Shock Process for Rapid Synthesis of 2D Porous La<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3</sub> Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Microwave Shock Process for Rapid Synthesis of 2D Porous La<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3</sub> Perovskite as an Efficient Oxygen Evolution Reaction Catalyst

Iridium‐Doped 10H‐Phase Perovskite BaCo0.8Fe0.15Ir0.05O3–δ as an Efficient Oxygen Evolution Reaction Catalyst

A review of progress in proton ceramic electrochemical cells: material and structural design, coupled with value-added chemical production

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Iridium‐Doped 10H‐Phase Perovskite BaCo₀_.₈Fe₀_.₁₅Ir₀_.₀₅O₃_–δ as an Efficient Oxygen Evolution Reaction Catalyst