Microwave-assisted synthesis of Mn3O4-Fe2O3/Fe3O4@rGO ternary hybrids and electrochemical performance for supercapacitor electrode

Kumar, Rajesh; Youssry, Sally M.; Ya, Kyaw Zay; Tan, Wei; Kawamura, Go; Matsuda, Atsunori

doi:10.1016/j.diamond.2019.107622

Cited by 123 publications

(33 citation statements)

References 74 publications

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“…In this work, we present an atomic resolution live (in-situ) study of electron beaminduced transformations in core/shell Fe3O4/Mn3O4 and Mn3O4/Fe3O4 nanoparticles by means of high-resolution scanning transmission electron microscopy combined with electron energy-loss spectroscopy (STEM-EELS). Interestingly, the manganese oxideiron oxide nanoparticles system is appealing not only for its unique magnetic properties (e.g., antiferromagnetic interface coupling or magnetic proximity effects) [10,[38][39][40] but also for its applications in diverse fields like catalysis and environmental remediation [41,42], batteries and supercapacitors [43,44], microwave components [45] or biomedicine [46,47]. Our results, acquired within time scale of minutes, show that the nanoparticles under electron irradiation can develop a variety of defects, including formation of voids and dislocations, as the Mn3O4 component is forced to reduce to MnO.…”

Section: Introductionmentioning

confidence: 99%

Probing the meta-stability of oxide core/shell nanoparticle systems at atomic resolution

Roldán

Mayence

López‐Ortega

et al. 2021

Chemical Engineering Journal

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Hybrid nanoparticles allow exploiting the interplay of confinement, proximity between different materials and interfacial effects. However, to harness their properties an in-depth understanding of their (meta)stability and interfacial characteristics is crucial. This is especially the case of nanosystems based on functional oxides working under reducing conditions, which may severely impact their properties.In this work, the in-situ electron-induced selective reduction of Mn3O4 to MnO is studied in magnetic Fe3O4/Mn3O4 and Mn3O4/Fe3O4 core/shell nanoparticles by means of high-resolution scanning transmission electron microscopy combined with electron energy-loss spectroscopy. Such in-situ transformation allows mimicking the actual processes in operando environments. A multi-stage image analysis using geometric phase analysis combined with particle image velocity enables direct monitoring of the relationship between structure, chemical composition and strain relaxation during the Mn3O4 reduction. In the case of Fe3O4/Mn3O4 core/shell the transformation occurs smoothly without the formation of defects. However, for the inverse Mn3O4/Fe3O4 core/shell configuration the electron beam-induced transformation occurs in different stages that include redox reactions and void formation followed by strain field relaxation via formation of defects. This study highlights the relevance of understanding the local dynamics responsible for changes in the particle composition in order to control stability and, ultimately, macroscopic functionality.

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Section: Introductionmentioning

confidence: 99%

Probing the meta-stability of oxide core/shell nanoparticle systems at atomic resolution

Roldán

Mayence

López‐Ortega

et al. 2021

Chemical Engineering Journal

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“…The faradic reactions take place during the charge/discharge processes, and hence pseudocapacitors usually improve electrochemical performance. The supercapacitors based on composite metal oxides/hydroxides materials of graphene and numerous conductive polymers have been reported to achieve high capacitance. − The conducting polymers including polyaniline (PANI), polypyrrole (PPy), and poly(3,4-ethylenedioxythiophene) (PEDOT) have facile synthesis, low cost, high flexibility, and high pseudocapacitance . Polyaniline synthesis does not require any special equipment or precautions, and its electrochemical behavior shows a multiredox state, so reduced graphene oxide/polyaniline (RGO@PANI) composites have attracted significant attentions.…”

Section: Introductionmentioning

confidence: 99%

One-Step Fabrication of Flexible, Cost/Time Effective, and High Energy Storage Reduced Graphene Oxide@PANI Supercapacitor

Laelabadi

Moradian

Manouchehri

2020

ACS Appl. Energy Mater.

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The advances in micro-size and in-plane supercapacitors lead to produce the miniaturizing energy storage devices in portable and bendable electronics. Micro-supercapacitors have the unique electrochemical performance, such as high power density, fast charging, long cycle life and high safety. The reduction time and cost in fabrication processes of micro supercapacitors are important factors in micro-fabrication technology. In this work, a simple, scalable and cost-effective fabrication of interdigitated reduced graphene oxide@polyaniline flexible micro supercapacitors is presented. We found that in fabricating the interdigitated micro electrode patterns on PET substrate; the reduction of graphene oxide and growth of conducting polymer are rapidly performed simultaneously in one step by laser irradiation. The capacitance was 72 mF/cm 2 at 35µA/cm 2 current density. These highly capacitance micro supercapacitors demonstrate good stability and more than 93.5% of the capacitance retain after 1000 cycles at 0.7 mA/cm 2 current density.

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“…Various However, due to the inherent crystallographic instability, manganese oxide and iron oxide active material electrodes often suffer from structure collapse, resulting in short cycle life [15][16][17]. Ni-and Co-based materials have demonstrated excellent energy density, and their unsatisfactory cycling stability and retention rate restrict their applications [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation of mulberry-like RuO2 electrode material for supercapacitors

Pang

Wang

2020

Rare Met.

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As a newly emerging excellent energy storage device, supercapacitors have been widely studied due to their unique advantages. Electrode material is one of the key components that determine the performance of a supercapacitor. Among the various electrode materials of supercapacitors, RuO 2 has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability. However, most RuO 2 materials suffer the problem of low specific surface area, causing a much lower actual capacitance value compared to the theoretical performance of the material. In this work, a mulberry-like RuO 2 electrode material with large specific surface area (159.4 m 2 Ág -1 ) was successfully synthesized by a facial hydrothermal method. The electrochemical characterization has shown that the RuO 2 possesses a high specific capacitance of 400 FÁg -1 at a current density of 0.2 AÁg -1 and good capacitance retention rate of 84.7% after 6000 charge/discharge cycles under a current density of 10 AÁg -1 . The energy densities and power densities of the RuO 2 -AC supercapacitor vary from 25.0 to 11.7 WhÁkg -1 and 160 to 10,560 WÁkg -1 at current density ranging from 0.2 to 10.0 AÁg -1 , respectively.

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Microwave-assisted synthesis of Mn3O4-Fe2O3/Fe3O4@rGO ternary hybrids and electrochemical performance for supercapacitor electrode

Cited by 123 publications

References 74 publications

Probing the meta-stability of oxide core/shell nanoparticle systems at atomic resolution

Probing the meta-stability of oxide core/shell nanoparticle systems at atomic resolution

One-Step Fabrication of Flexible, Cost/Time Effective, and High Energy Storage Reduced Graphene Oxide@PANI Supercapacitor

Preparation of mulberry-like RuO2 electrode material for supercapacitors

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