A comparison between hot-hydrolysis and sonolysis of various Mn(II) salts

Kumar, V. Ganesh; Aurbuch, D; Gedanken, Aharon

doi:10.1016/s1350-4177(02)00091-3

Cited by 32 publications

(5 citation statements)

References 13 publications

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“…The crystal structures of the manganese oxide films heat-treated at 200, 300, and 400°C corresponded well to that of hausmannite Mn 3 O 4 with a normal tetragonal spinel structure belonging to space group I4 1 /amd. 24 The unitcell parameters of the oxide films heated at 200, 300, and 400°C were calculated from the XRD patterns shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

Manganese Oxide Film Electrodes Prepared by Electrostatic Spray Deposition for Electrochemical Capacitors

Nam

Kim

2006

J. Electrochem. Soc.

138

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Porous manganese oxide thin film electrodes were prepared for use in electrochemical capacitors by electrostatic spray deposition. The as-prepared manganese oxide film showed ideal capacitive behavior after potential cycling within the range of −0.1 to 0.9 V ͑vs saturated calomel electrode͒ in a 0.1 M Na 2 SO 4 electrolyte. Analysis of the X-ray diffraction, X-ray absorption spectroscopy, and Raman scattering data during the cycling showed that the as-prepared crystalline Mn 3 O 4 film was electrochemically oxidized to pseudocapacitive amorphous MnO 2 film by the potential cycling. The effects of the film thickness and heat treatment temperature of the as-prepared manganese oxide films on the electrochemical properties were also investigated. The specific capacitance of the electrochemically oxidized amorphous MnO 2 films was dependent on the film thickness, rather than on the heat treatment of the as-prepared oxide films. The specific capacitance decreased from 330 to 150 F/g as the mass ͑i.e., thickness͒ of the oxide was increased from 18 to 116 g/cm 2 .

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Section: Resultsmentioning

confidence: 99%

Manganese Oxide Film Electrodes Prepared by Electrostatic Spray Deposition for Electrochemical Capacitors

Nam

Kim

2006

J. Electrochem. Soc.

138

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“…Not always is it possible to obtain the result one is looking for, during the preparation of nanomaterials using US. Ganesh Kumar et al did not obtain lithiated manganese oxide suitable for lithium batteries by treating Mn(III) salts using US and hot-hydrolysis, but the study showed the superiority of the ultrasonication regarding the adjustment of particle properties [58]. In another attempt of the same group, LiNi 0.5 Mn 1.5 O 4 was synthesized sonochemically as cathode with high redox potential for LIBs with better cyclability [59].…”

Section: Li-batteries and Li-ion Batteriesmentioning

confidence: 99%

Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications

Vaitsis¹,

Mechili²,

Argirusis³

et al. 2020

Nanotechnology and the Environment

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Ultrasound (US) technology is already into the research field providing a powerful tool of producing nanomaterials or being implicated in decoration procedures of catalyst supports for energy applications and material production. Toward this concept, low or/and high-frequency USs are used for the production of nanoparticles, the decoration of catalytic supported powders (carbon-based, titania, and alumina) with nanoparticles, and the production of metal-organic frameworks (MOFs). MOFs are porous, crystalline materials, which consist of metal centers and organic linkers. Those structures demonstrate high surface area, open metal sites, and large void space. All the above produced materials are used in heterogeneous catalysis, electrocatalysis, photocatalysis, and energy storage. Batteries and fuel cells are popular systems for electrochemical energy storage, and significant progress has been made in nanostructured energy materials in order to improve these storage devices. Nanomaterials have shown favorable properties, such as enhanced kinetics and better efficiency as catalysts for the oxygen reduction reaction (ORR).

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“…Practically, the fabrication of manganese oxide has been explored through various methods. Several different precursors, such as MnSO 4 , KMnO 4 , H 2 SO 4 , or K 2 S 2 O 8 , have been proven to affect the oxide allotrope, size, and crystal structure. − Another study reported that the hydrothermal oxidation process resulted in pure single-phase spinel-tetragonal Mn 3 O 4 . Spherical manganese oxide with average sizes in the range of 36–39 nm was obtained through an ultrasonic irradiation-assisted coprecipitation method .…”

Section: Introductionmentioning

confidence: 99%

“…6−10 Another study reported that the hydrothermal oxidation process resulted in pure single-phase spinel-tetragonal Mn 3 O 4 . 11 Spherical manganese oxide with average sizes in the range of 36−39 nm was obtained through an ultrasonic irradiation-assisted coprecipitation method. 3 Manganese oxide nanowires were successfully synthesized by solvothermal treatment in a polyol system for 24 h. 12 Hausmannite thin films were prepared by a chemical spray pyrolysis technique with the size of 49 ± 0.3 nm and a calculated microstrain of 5.29 × 10 −3 .…”

Section: ■ Introductionmentioning

confidence: 99%

Anomalous Temperature-Induced Particle Size Reduction in Manganese Oxide Nanoparticles

Noviyanto,

Amalia,

Maulida

et al. 2023

ACS Omega

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The intricate role of temperature in the structure−property relationship of manganese oxide nanoparticles (Mn 3 O 4 NPs) remains an open question. In this study, we successfully synthesized Mn 3 O 4 NPs using the hydrothermal method with two differing temperatures, namely, 90 and 150 °C. Interestingly, a smaller average particle size is found when Mn 3 O 4 NPs are synthesized at 150 °C compared to 90 °C, corresponding to 46.54 and 63.37 nm, respectively. This was confirmed by the time variation of temperature setting of 150 °C where the size evolution was insignificant, indicating a competing effect of nucleation and growth particles. Under varying NaOH concentrations (2−6 M) at 150 °C, a reduction in the particle size is found at the highest NaOH concentration (6 M). The particle grows slightly, indicating that the growth state is dominant compared to the nucleation state at low concentrations of NaOH. This finding implies that the high nucleation rate originates from the excessive monomer supply in the high-temperature reaction. In terms of crystallinity order, the structural arrangement of Mn 3 O 4 NPs (150 °C) is largely decreased; this is likely due to a facile redox shift to the higher oxidation state of manganese. In addition, the higher ratio of adsorbed oxygen and lattice oxygen in Mn 3 O 4 NPs at 150 °C is indirectly due to the higher oxygen vacancy occupancies, which supported the crystallinity decrease. Our findings provide a new perspective on manganese oxide formation in hydrothermal systems.

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A comparison between hot-hydrolysis and sonolysis of various Mn(II) salts

Cited by 32 publications

References 13 publications

Manganese Oxide Film Electrodes Prepared by Electrostatic Spray Deposition for Electrochemical Capacitors

Manganese Oxide Film Electrodes Prepared by Electrostatic Spray Deposition for Electrochemical Capacitors

Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications

Anomalous Temperature-Induced Particle Size Reduction in Manganese Oxide Nanoparticles

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