Fe3O4 spinel-Mn3O4 spinel supercapacitor prepared using Celestine blue as a dispersant, capping agent and charge transfer mediator

Nawwar, Mohamed; Poon, R.; Sahu, Rakesh P.; Puri, Ishwar K.; Zhitomirsky, Igor

doi:10.1016/j.ceramint.2020.04.204

Cited by 29 publications

(4 citation statements)

References 37 publications

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“…[53][54][55] It has previously been shown that catecholatetype redox-active molecules can act as charge transfer medicators, which facilitate charge-discharge reactions of supercapacitor materials. 56 Moreover, adsorbed catecholate molecules facilitate charge transfer in other processes, such electropolymerization and photovoltaic current generation. 45 Sedimentation tests showed enhanced suspension stability of Mn 3 O 4 and MWCNT in the presence of QC as a dispersant (see Fig.…”

Section: Electrochemical and Microstructure Characterizationmentioning

confidence: 99%

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

et al. 2022

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Section: Electrochemical and Microstructure Characterizationmentioning

confidence: 99%

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

et al. 2022

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“…These studies highlighted the advantages of charged dispersants containing chelating anchoring groups which facilitated dispersant adsorption by creating complexes with metal atoms on the particle surface [38][39][40]. Moreover, it was found that redox-active dispersants containing chelating groups could facilitate charge transfer between oxide particles and conductive additives or current collectors and increase pseudocapacitance [41]. In this investigation, we examined properties of ASPA molecules for the co-dispersion of CuFe 2 O 4 particles and MCNTs.…”

Section: Resultsmentioning

confidence: 99%

Magnetic CuFe2O4 Nanoparticles with Pseudocapacitive Properties for Electrical Energy Storage

2022

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This investigation is motivated by increasing interest in the development of magnetically ordered pseudocapacitors (MOPC), which exhibit interesting magnetocapacitive effects. Here, advanced pseudocapacitive properties of magnetic CuFe2O4 nanoparticles in negative potential range are reported, suggesting that CuFe2O4 is a promising MOPC and advanced negative electrode material for supercapacitors. A high capacitance of 2.76 F cm−2 is achieved at a low electrode resistance in a relatively large potential window of 0.8 V. The cyclic voltammograms and galvanostatic charge–discharge data show nearly ideal pseudocapacitive behavior. Good electrochemical performance is achieved at a high active mass loading due to the use of chelating molecules of ammonium salt of purpuric acid (ASPA) as a co-dispersant for CuFe2O4 nanoparticles and conductive multiwalled carbon nanotube (MCNT) additives. The adsorption of ASPA on different materials is linked to structural features of ASPA, which allows for different interaction and adsorption mechanisms. The combination of advanced magnetic and pseudocapacitive properties in a negative potential range in a single MOPC material provides a platform for various effects related to the influence of pseudocapacitive/magnetic properties on magnetic/pseudocapacitive behavior.

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“…Mn 3 O 4 is gaining attention as a pseudocapacitive charge-storage material for supercapacitors. − Investigations focused on the fabrication of thin films and high-active-mass (AM) bulk electrodes ,− by various techniques and analysis of the charging mechanism. − The investigation of Mn 3 O 4 behavior in a Na 2 SO 4 electrolyte − is of particular importance for the manufacturing of asymmetric supercapacitors for operation in the voltage range of 1.6–2.0 V. The first step of the charging mechanism in a Na 2 SO 4 electrolyte involves solvation: Mn 3 normalO 4 → Na δ MnO italicx · normalH 2 normalO X-ray absorption spectroscopy (XAS) investigations confirmed Na δ MnO x formation during the initial cycling and revealed Mn 3+ -ion reduction. Another XAS study confirmed the reduction of Mn 3+ to Mn 2+ at low potentials and revealed the oxidation of Mn 3+ to Mn 4+ or Mn 6+ at higher potentials …”

Section: Introductionmentioning

confidence: 99%

Influence of Capping Agents on the Synthesis of Mn₃O₄ Nanostructures for Supercapacitors

Yang

Zhitomirsky

2023

ACS Appl. Nano Mater.

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Nanotechnology offers powerful strategies for the synthesis of advanced materials for supercapacitors. It is hypothesized that the size reduction of Mn3O4 nanoparticles can eliminate time-consuming electrochemical activation and increase the electrochemical pseudocapacitance of this material. Moreover, due to the redox properties and specific features of its chemical synthesis procedure, Mn3O4 can potentially outperform other promising cathode materials for energy storage in supercapacitors. A facile room temperature method to fabricate Mn3O4 nanoparticles is described, which is based on the application of advanced capping agents (CAs) for nanofabrication. Building on the strong adsorption power of the catechol ligand, we utilize tetrahydroxy-1,4-quinone, catechin, and gallocyanine as CAs for the preparation of Mn3O4. The use of the catecholate molecules as CAs for chemical precipitation facilitates the preparation of Mn3O4 platelet nanoparticles with a typical size of 5 nm. The reduction of the particle size allows the fabrication of advanced Mn3O4 multiwalled carbon nanotube cathodes with 40 mg cm–2 active mass (AM), which show a significant increase in capacitance in a 0.5 M Na2SO4 electrolyte. The highest capacitances of 7.03 F cm–2 (175.8 F g–1) at a potentiodynamic sweep rate of 2 mV s–1 and 9.13 F cm–2 (228.3 F g–1) at a constant current density of 3 mA cm–2 are obtained at a low impedance using gallocyanine as a CA. Obtained electrodes outperform MnO2-based cathodes of similar mass. Another important finding is the possibility to avoid the time-consuming activation process for Mn3O4-based electrodes. Analysis of the testing results provides evidence of the influence of the CA structure on the electrode performance. The results of this investigation pave the way for the application of Mn3O4 in advanced high-AM supercapacitor cathodes.

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Fe3O4 spinel-Mn3O4 spinel supercapacitor prepared using Celestine blue as a dispersant, capping agent and charge transfer mediator

Cited by 29 publications

References 37 publications

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

Magnetic CuFe2O4 Nanoparticles with Pseudocapacitive Properties for Electrical Energy Storage

Influence of Capping Agents on the Synthesis of Mn₃O₄ Nanostructures for Supercapacitors

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Fe3O4 spinel-Mn3O4 spinel supercapacitor prepared using Celestine blue as a dispersant, capping agent and charge transfer mediator

Cited by 29 publications

References 37 publications

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn3O4 supercapacitor electrodes

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn3O4 supercapacitor electrodes

Magnetic CuFe2O4 Nanoparticles with Pseudocapacitive Properties for Electrical Energy Storage

Influence of Capping Agents on the Synthesis of Mn3O4 Nanostructures for Supercapacitors

Contact Info

Product

Resources

About

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

Scanning transmission X-ray microscopy studies of electrochemical activation and capacitive behavior of Mn₃O₄ supercapacitor electrodes

Influence of Capping Agents on the Synthesis of Mn₃O₄ Nanostructures for Supercapacitors