Mn3O4 and (ZnFe)OOH Composites for Supercapacitors with High Active Mass

Poon, R.; Liang, Wenyu; Zhitomirsky, Igor

doi:10.1007/s11661-019-05561-x

Cited by 8 publications

(9 citation statements)

References 42 publications

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“…This is in agreement with previous investigations, which showed a capacitance increase during cycling [30][31][32][33]. Several previous XPS investigations showed an oxidation of Mn 2+ and Mn 3+ ions with an increased content of Mn 4+ ions on the Mn3O4 particle surface during cycling and linked this process to the capacitance increase [31,[33][34][35]. Moreover, previous investigations showed that the application of Mn3O4 for supercapacitors requires the use of time-consuming activation procedures [31,33,35].…”

Section: Resultssupporting

confidence: 92%

“…However, a significant increase in the capacitance of Mn 3 O 4 was observed during cycling [30][31][32][33]. Numerous XPS studies revealed oxidation of Mn 2+ and Mn 3+ ions on the Mn 3 O 4 particle surface during cycling and linked this process to the capacitance increase [31,[33][34][35]. The application of Mn 3 O 4 for supercapacitors requires the use of time-consuming activation procedures [31,33,35].…”

Section: Introductionmentioning

confidence: 99%

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Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Nawwar

Zhitomirsky

2022

Energies

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The purpose of this investigation was the development of a new colloidal route for the fabrication of Mn3O4 electrodes for supercapacitors with enhanced charge storage performance. Mn3O4-carbon nanotube electrodes were fabricated with record-high capacitances of 6.67 F cm−2 obtained from cyclic voltammetry tests at a scan rate of 2 mV s−1 and 7.55 F cm−2 obtained from the galvanostatic charge–discharge tests at a current density of 3 mA cm−2 in 0.5 M Na2SO4 electrolyte in a potential window of 0.9 V. The approach involves the use of murexide as a capping agent for the synthesis of Mn3O4 and a co-dispersant for Mn3O4 and carbon nanotubes. Good electrochemical performance of the electrode material was achieved at a high active mass loading of 40 mg cm−2 and was linked to a reduced agglomeration of Mn3O4 nanoparticles and efficient co-dispersion of Mn3O4 with carbon nanotubes. The mechanisms of murexide adsorption on Mn3O4 and carbon nanotube are discussed. With the proposed method, the time-consuming electrode activation procedure for Mn3O4 electrodes can be avoided. The approach developed in this investigation paves the way for the fabrication of advanced cathodes for asymmetric supercapacitors and multifunctional devices, combining capacitive, magnetic, and other functional properties.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Nawwar

Zhitomirsky

2022

Energies

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“…[16][17][18][19][20] The activation process was linked to in situ modi-cation of the electrode microstructure. 17,19,21,22 Previous investigations showed that capacitance variations during activation process can be diminished using mixed rhamnolipids as a capping agent for the synthesis of Mn 3 O 4 particles and modication of particle morphology. 20 However, the origin of the capacitance variation during the activation process and charging mechanism are not well understood.…”

Section: Introductionmentioning

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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“…This can be attributed to electrode activation during initial cycling at low scan rates. Numerous XPS studies showed that the activation process results in oxidation of Mn 2+ and Mn 3+ ions on the Mn 3 O 4 particle surface during cycling in the positive potential range and linked this process to the capacitance increase [ 20 , 21 , 22 , 25 ]. The oxidation process was influenced by the duration of the application of a positive potential.…”

Section: Resultsmentioning

confidence: 99%

“…Such activation procedures resulted in significant capacitance increase [ 20 , 22 , 23 , 24 ]. Several XPS studies revealed oxidation of Mn 2+ and Mn 3+ ions on the Mn 3 O 4 particle surface during cycling and linked this process to the increasing capacitance [ 20 , 21 , 22 , 25 ]. The challenges related to Mn 3 O 4 applications can be addressed using advanced capping agents for the Mn 3 O 4 synthesis and co-dispersants for Mn 3 O 4 and conductive additives.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Processing of Mn3O4-Carbon Nanotube Nanocomposite Electrodes for Supercapacitors

Zhitomirsky

2022

Nanomaterials

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This investigation addresses the challenges in the development of efficient nanostructured Mn3O4 cathodes for supercapacitors. A high areal capacitance and the ability to avoid a time-consuming activation procedure for electrodes with high active mass loading of 40 mg cm−2 are reported. This facilitates practical applications of Mn3O4 based electrodes. The highest capacitance of 6.11 F cm−2 (153 F g−1) is obtained from cyclic voltammetry at a scan rate of 2 mV s−1 and 6.07 F cm−2 (151.9 F g−1) from the chronopotentiometry at a current density of 3 mA cm−2 in a potential window of 0.9 V in a neutral Na2SO4 electrolyte. The new approach is based on the application of rhamnolipids (RL) as a capping agent for the synthesis of Mn3O4 particles and a co-dispersant for Mn3O4 and carbon nanotubes, which are used as conductive additives. The size and shape of the Mn3O4 particles are influenced by RL. The enhanced performance of the electrodes is linked to the chemical structure and properties of RL molecules, which exert influence on Mn3O4 particle size and shape during synthesis, reduce agglomeration, facilitate RL adsorption on Mn3O4 and carbon nanotubes, and influence their co-dispersion and mixing at the nanometric scale.

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Mn3O4 and (ZnFe)OOH Composites for Supercapacitors with High Active Mass

Cited by 8 publications

References 42 publications

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

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

Colloidal Processing of Mn3O4-Carbon Nanotube Nanocomposite Electrodes for Supercapacitors

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Mn3O4 and (ZnFe)OOH Composites for Supercapacitors with High Active Mass

Cited by 8 publications

References 42 publications

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

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

Colloidal Processing of Mn3O4-Carbon Nanotube Nanocomposite Electrodes for Supercapacitors

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Resources

About

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