Monovalent doping effects on the structural, magnetic and magnetotransport properties of La0.833R0.167MnO3 (R = Li+, Na+, Ag+, K+)

Joseph, Smitha; Saban, K.V.

doi:10.1016/j.ceramint.2018.12.130

Cited by 18 publications

(7 citation statements)

References 67 publications

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“…The higher stability of the catalyst can be ascribed to the size of the potassium (1.64 Å), which is slightly higher than the divalent cations, thus stabilizing the Goldsmith tolerance factor, which defines the overall perovskite structure stability. Also, the higher concentration of Mn 4+ decreases the Jahn–Teller distortion associated with the Mn 3+ ions …”

Section: Results and Discussionmentioning

confidence: 99%

“…Also, the higher concentration of Mn 4+ decreases the Jahn−Teller distortion associated with the Mn 3+ ions. 25 A zinc−air battery typically consists of an anode (Zincplate), a cathode (air), a separator in between them, and the electrolyte, as shown in Figure 6. As an electrolyte, 6 M KOH and additives like Zn(Ac) 2 or ZnO are mixed into a mixture to facilitate the reversible conversion of zinc anode in zinc−air batteries.…”

Section: Resultsmentioning

confidence: 99%

“…Herein, we successfully synthesized catalytically active potassium-substituted LaMnO 3 perovskite oxide microcubes via a low-temperature, energy-efficient solution-phase hydrothermal method. The K + substitution increases the average A-site ionic radii, thus leading the crystal structure toward a higher symmetry . Further, the K + substitution also improves exchange interaction between the manganese ions and the effective transfer integral of the e g electrons. , …”

Section: Introductionmentioning

confidence: 99%

“…The K + substitution increases the average Asite ionic radii, thus leading the crystal structure toward a higher symmetry. 25 Further, the K + substitution also improves exchange interaction between the manganese ions and the effective transfer integral of the e g electrons. 26,27 The electrocatalytic activity and durability of designed electrocatalysts are examined by electrochemical studies in a three-electrode system and full cell studies in zinc−air battery.…”

Section: Introductionmentioning

confidence: 99%

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Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Kotha

Karajagi

Ghosh

et al. 2022

ACS Appl. Energy Mater.

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Efficient, low-cost, and long-lasting electrocatalysts that accelerate sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) kinetics are highly desirable for a variety of applications, including metal–air batteries and fuel cells, but they are uncommon. Such bifunctional catalysts are primarily harmed by either low catalytic activity or degradation during prolonged cycling. We devise a relatively low-temperature hydrothermal strategy for producing a perovskite oxide-based catalyst composed of potassium-substituted LaMnO3. In an alkaline environment, the catalyst performs admirably, with improved kinetics and activity for the ORR (half-wave potential of 0.78 V) and OER (potential at the current density of 10 mA cm–2 is 1.66 V). Furthermore, as a two-electrode cell, this catalyst renders the potential for use as an electrode in zinc–air batteries with unprecedented stability (no visible sign of degradation even after 1000 cycles of charge–discharge).

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Kotha

Karajagi

Ghosh

et al. 2022

ACS Appl. Energy Mater.

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“…Doping manganese with other elements results in superior properties, with theoretical calculations indicating the presence of additional multiferroic magnetic phases. 57 Some manganite perovskite materials that show MR values include manganite perovskites based on LaMnO 3 ( 46 and 58–60 ) and NdMnO 3. 22…”

Section: Classification Of Magnetoresistance Materials Groupsmentioning

confidence: 99%

Magnetoresistance (MR) properties of magnetic materials

Vitayaya,

Zul Nehan,

Munazat

et al. 2024

RSC Adv.

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Unusual electrical behaviour in sol–gel-synthesised PKMO nano-sized manganite

Lim

Lau

et al. 2019

Appl. Phys. A

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Mixed-valence manganites have gained tremendous attention in the scientific research for its colossal magnetoresistance phenomenon. Nevertheless, the study devoted to praseodymiumbased manganites is still limited to date. The present work aims to investigate the grain size effect on sol-gel grown nano-sized Pr0.85K0.15MnO3 (PKMO). The grain size has been modified by heat treatment ranging from 600 °C to 1000 °C. PKMO samples have been studied in detail to elucidate the correlation of spin, charge, orbital and lattice degrees of freedom. The X-ray diffraction analysis revealed that all samples exhibit in single orthorhombic phase with the space group of Pnma (62). The obtained crystallite size and average grain size are in the range of 45-115 nm and 51-210 nm, respectively. The evolution of grains intensively affects the electrical and magneto-transport properties of PKMO. The temperature dependence of the resistivity has been fitted with theoretical expressions in different temperature regimes to investigate their conduction mechanisms. The resistivity exhibits an unusual trend when the grain size increases where a similar pattern also been observed in metal-insulator transition temperature (TMI). This behaviour can be ascribed to the grain size distribution, grain formation and also the occurrence of oxygen vacancies at the grain boundaries. Enhancement of high field magnetoresistance has been discovered below 180 K, whereas low field magnetoresistance is suppressed as the temperature increases and almost vanished at 300 K. The PKMO study demonstrated here is clearly dominated by extrinsic properties (grain evolution) from the evidence of electrical and magneto-transport measurements.

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Monovalent doping effects on the structural, magnetic and magnetotransport properties of La0.833R0.167MnO3 (R = Li+, Na+, Ag+, K+)

Cited by 18 publications

References 67 publications

Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Magnetoresistance (MR) properties of magnetic materials

Unusual electrical behaviour in sol–gel-synthesised PKMO nano-sized manganite

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Monovalent doping effects on the structural, magnetic and magnetotransport properties of La0.833R0.167MnO3 (R = Li+, Na+, Ag+, K+)

Cited by 18 publications

References 67 publications

Potassium-Substituted LaMnO3 as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Potassium-Substituted LaMnO3 as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Magnetoresistance (MR) properties of magnetic materials

Unusual electrical behaviour in sol–gel-synthesised PKMO nano-sized manganite

Contact Info

Product

Resources

About

Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions

Potassium-Substituted LaMnO₃ as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions