Cobalt doping in LaMnO3 perovskite catalysts – B site optimization by solution combustion for oxygen evolution reaction

Vazhayil, Ashalatha; Thomas, Jasmine; Thomas, Nygil

doi:10.1016/j.jelechem.2022.116426

Cited by 24 publications

(14 citation statements)

References 60 publications

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“…In addition, the covalency of the Co-O bond was improved, which promoted the reaction kinetics. In the same way, Vazhayil el at (Vazhayil et al, 2022). reported that the LaMn 0.2 Co 0.8 O 3 perovskite had a good stability and acceptable OER activity.…”

Section: Perovskite Metal Oxide-based Materials With Partial Substitu...mentioning

confidence: 75%

“…Due to the good catalytic activity of LaMnO 3 and LaCoO 3 , several authors proposed doping LaMnO 3 perovskites with cobalt (Hu et al, 2015;Lee et al, 2015c;Liu et al, 2018;Lv et al, 2019;Sun et al, 2020;Vazhayil et al, 2022). Particularly, Hu et al (2015) and Lee et al (2015c) observed that a small cobalt substitution is sufficient to produce a significant improvement of the catalytic response in ORR, with a better onset potential and a higher current density.…”

Section: Perovskite Metal Oxide-based Materials With Partial Substitu...mentioning

confidence: 99%

See 1 more Smart Citation

Transition metal oxides with perovskite and spinel structures for electrochemical energy production applications

Flores-Lasluisa

Huerta

Cazorla‐Amorós

et al. 2022

Environmental Research

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Section: Perovskite Metal Oxide-based Materials With Partial Substitu...mentioning

confidence: 75%

Section: Perovskite Metal Oxide-based Materials With Partial Substitu...mentioning

confidence: 99%

Transition metal oxides with perovskite and spinel structures for electrochemical energy production applications

Flores-Lasluisa

Huerta

Cazorla‐Amorós

et al. 2022

Environmental Research

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“…The two spin peaks at 833.9 eV and 850.7 eV are correspond to La 3d5/2 and La 3d3/2 and the characteristic peaks at 838.0 eV and 855.0 eV were assigned to the satellite peaks (Fig. 4c) 58 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

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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“…Compared to the best prior, H-LSFN offers comparable OER activity (Figure 3b). [14][15][16][17][18][19] The Tafel slope of H-LSFN was 59 mV dec −1 , which is lower than LSFN (90 mV dec −1 ). This suggests that the exsolution of B site metal in H-LSFN causes a shift in the rate-determining step (RDS) from the first electron transfer step to the following elementary reaction.…”

Section: Electrocatalytic Performancementioning

confidence: 99%

B‐Site‐Metal Exsolution on Perovskite Oxides Activates Alkaline Water Oxidation via the Lattice Oxygen Mechanism

Han,

Zhuansun,

Wang

et al. 2023

Adv Materials Inter

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Effective electrocatalysts are crucial for facilitating the oxygen evolution reaction (OER), the anodic reaction of water electrolysis for renewable green hydrogen production. Perovskite oxides are a group of potential catalysts featuring the lattice oxygen mechanism (LOM) for OER, where O2 formation commences via a lattice oxygen redox process. The LOM pathway breaks the thermodynamic limitation of the adsorbate evolution mechanism (AEM) and achieves a high intrinsic activity. However, perovskite oxides often suffer high OER overpotentials due to the insufficient activation of the LOM pathway. Typically, the overpotential exceeds 300 mV at 10 mA cm−2. This greatly impedes the practical applications of perovskite oxide based OER catalysts. Here, it is demonstrated that the B‐site‐metal exsolution of a La0.6Sr0.4Fe0.8Ni0.2O3‐δ perovskite increases the activity of LOM by a factor of 3.8 at 400 mV overpotential. The activated LOM pathway leads to a 36‐mV reduction in the overpotential at 10 mA cm−2 (from 310 mV to 274 mV) and a 2× increase in the turnover frequency (TOF) at 450 mV overpotential. A membrane electrode assembly (MEA) water electrolyzer equipped with this LSFN‐based catalyst offers 1 A cm−2 current density at 2.46 V and 24‐h operation stability.

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Cobalt doping in LaMnO3 perovskite catalysts – B site optimization by solution combustion for oxygen evolution reaction

Cited by 24 publications

References 60 publications

Transition metal oxides with perovskite and spinel structures for electrochemical energy production applications

Transition metal oxides with perovskite and spinel structures for electrochemical energy production applications

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

B‐Site‐Metal Exsolution on Perovskite Oxides Activates Alkaline Water Oxidation via the Lattice Oxygen Mechanism

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