Synthesis and electrocatalytic properties of La&lt;sub&gt;0.8&lt;/sub&gt;Sr&lt;sub&gt;0.2&lt;/sub&gt;FeO&lt;sub&gt;3−δ&lt;/sub&gt; perovskite oxide for oxygen reactions

Silva, R.A.; Soares, C. O.; Carvalho, Maria Graça; Tavares, Ana C.; Jorge, M. E. Melo; Gomes, A.; Pereira, M. I. da Silva; Rangel, C. M.

doi:10.3934/matersci.2017.4.991

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…One possible candidate for these purposes takes into account perovskite materials for OER and ORR processes with high-temperature durability and high conductivity [16]. For instance, bifunctional La1-xSrxFeO3-δ based perovskite has been used for cathodic and anodic material in high-temperature fuel cells and electrolyzes, respectively [17]. Here, reducing La and increasing Sr in the A site increases the oxygen vacancies which plays a crucial role for OER and also controlling the B site composition ratio in the structure enhances ORR.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Low Bi Doped La0.60Dy0.10Sr0.30Mn(1-x)BixO3 Perovskite Magneticaloric Materials

Kurt

2022

ADYU J SCI

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Developing low-cost, high-durability and high-performance electrocatalytic materials are needed for hydrogen/oxygen evolution (HER/OER) and oxygen reduction reactions (ORR) which are crucial steps for regenerative fuel cells. Although Pt-based, RuO2 and IrO2 materials are widely used for these purposes, other alternative materials are required with desired properties. In this regard, we studied the electrochemical properties of lanthanum-based perovskites which were synthesized by sol-gel method. We investigated the addition of 10% Dy and 30% Sr into the A site and a small amount of Bi (x: 0, 0.03 and 0.1) added into the B site of La0.60Dy0.10Sr0.30Mn(1-x)BixO3 perovskites on HER, OER and ORR in 1 M KOH alkaline media at room temperature. While the addition of 0% and 3% Bi exhibited poor HER activities, the effect of 10% Bi in the structure enhanced HER activities by lowering onset potential from -1.389 V to -1.036 V (vs. Ag/AgCl) and increasing specific current density at -1.4 V from -13.3 mA cm-2 to -121.8 mA cm-2. Similarly, OER activity was also improved due to 10% Bi and onset potential and specific current density was found to be 0.758 V and 88.3 mA cm-2, respectively. The large Tafel slopes indicate that the ORR mechanism is possible in the structure but at a slow rate. The addition of 10% Bi in the structure resulted in a very high resistance of 19.3 kΩ and it reduced to a desired value of 3.5 kΩ due to ion conducting paths developed in the catalysts.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Low Bi Doped La0.60Dy0.10Sr0.30Mn(1-x)BixO3 Perovskite Magneticaloric Materials

Kurt

2022

ADYU J SCI

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“…Thus, a proper assessment of the stability of bifunctional ORR/OER catalysts aiming to reversible energy conversion applications requires the observation of time-dependent electrocatalytic behavior at alternating reaction conditions. This, however, results often in a fast and severe damage of ORR active sites during the reaction conditions of the OER, and/or vice versa, after a short time of exposure to the two reactions [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The sum is more than its parts: stability of MnFe oxide nanoparticles supported on oxygen-functionalized multi-walled carbon nanotubes at alternating oxygen reduction reaction and oxygen evolution reaction conditions

Morales

Kazakova

Purcel

et al. 2020

J Solid State Electrochem

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Successful design of reversible oxygen electrocatalysts does not only require to consider their activity towards the oxygen reduction (ORR) and the oxygen evolution reactions (OER), but also their electrochemical stability at alternating ORR and OER operating conditions, which is important for potential applications in reversible electrolyzers/fuel cells or metal/air batteries. We show that the combination of catalyst materials containing stable ORR active sites with those containing stable OER active sites may result in a stable ORR/OER catalyst if each of the active components can satisfy the current demand of their respective reaction. We compare the ORR/OER performances of oxides of Mn (stable ORR active sites), Fe (stable OER active sites), and bimetallic Mn0.5Fe0.5 (reversible ORR/OER catalyst) supported on oxidized multi-walled carbon nanotubes. Despite the instability of Mn and Fe oxide for the OER and the ORR, respectively, Mn0.5Fe0.5 exhibits high stability for both reactions.

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The Effects of Strontium and Magnesium Substitution on Structural, Magnetic and Redox Properties of Lanthanum Ortho Ferrite Nanoparticles

Saseetha,

Nagarajan,

Alshalwi

et al. 2024

Waste Biomass Valor

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Synthesis and electrocatalytic properties of La<sub>0.8</sub>Sr<sub>0.2</sub>FeO<sub>3−δ</sub> perovskite oxide for oxygen reactions

Cited by 8 publications

References 49 publications

Electrochemical Properties of Low Bi Doped La0.60Dy0.10Sr0.30Mn(1-x)BixO3 Perovskite Magneticaloric Materials

Electrochemical Properties of Low Bi Doped La0.60Dy0.10Sr0.30Mn(1-x)BixO3 Perovskite Magneticaloric Materials

The sum is more than its parts: stability of MnFe oxide nanoparticles supported on oxygen-functionalized multi-walled carbon nanotubes at alternating oxygen reduction reaction and oxygen evolution reaction conditions

The Effects of Strontium and Magnesium Substitution on Structural, Magnetic and Redox Properties of Lanthanum Ortho Ferrite Nanoparticles

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