High-performance Mn3O4 nanomaterials synthesized via a new two-step hydrothermal method in asymmetric supercapacitors

Wang, Zhongbing; Fang, Jingyuan; Hao, Yonghao; Chen, Chunnian; Zhang, Dawei

doi:10.1016/j.mssp.2021.105823

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…1,2 Such devices offer advantages of enlarged voltage windows and enhanced power-energy characteristics. Investigations are focused on the development of advanced techniques for the deposition of nanostructured Mn 3 O 4 lms 1 and synthesis of Mn 3 O 4 nanoparticles 1,3,4 for the fabrication of bulk electrodes with high active mass. Understanding the capacitive behavior and charging mechanism is crucial for the development of efficient electrodes and devices for practical applications.…”

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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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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“…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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“…Recently, numerous transition metal oxides (TMOs) such as CuO, MnO 2 , Mn 3 O 4 , RuO 2 , ZnO, NiO and Co 3 O 4 have been researched as electrode materials for supercapacitors [5][6][7][8][9][10][11]. Wang et al reported the performance of Mn 3 O 4 nanomaterials synthesized via a two-step hydrothermal method and applied in asymmetric supercapacitors [12]. Another approach to supercapacitors development is to integrate manganese oxides with other transition metals such as Ni, Zn and Co in formulating spinel structured NiMn 2 O 4 , ZnMn 2 O 4 and CoMn 2 O 4 nanomaterials [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

et al. 2022

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Spinel copper manganese oxide nanoparticles combined with acid-treated multi-walled carbon nanotubes (CuMn2O4/MWCNTs) were used in the development of electrodes for pseudocapacitor applications. The CuMn2O4/MWCNTs preparation involved initial synthesis of Mn3O4 and CuMn2O4 precursors followed by an energy efficient reflux growth method for the CuMn2O4/MWCNTs. The CuMn2O4/MWCNTs in a three-electrode cell assembly and in 3 M LiOH aqueous electrolyte exhibited a specific capacitance of 1652.91 F g−1 at 0.5 A g−1 current load. Similar investigation in 3 M KOH aqueous electrolyte delivered a specific capacitance of 653.41 F g−1 at 0.5 A g−1 current load. Stability studies showed that after 6000 cycles, the CuMn2O4/MWCNTs electrode exhibited a higher capacitance retention (88%) in LiOH than in KOH (64%). The higher capacitance retention and cycling stability with a Coulombic efficiency of 99.6% observed in the LiOH is an indication of a better charge storage behaviour in this electrolyte than in the KOH electrolyte with a Coulombic efficiency of 97.3%. This superior performance in the LiOH electrolyte than in the KOH electrolyte is attributed to an intercalation/de-intercalation mechanism which occurs more easily in the LiOH electrolyte than in the KOH electrolyte.

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High-performance Mn3O4 nanomaterials synthesized via a new two-step hydrothermal method in asymmetric supercapacitors

Cited by 10 publications

References 40 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

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

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

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High-performance Mn3O4 nanomaterials synthesized via a new two-step hydrothermal method in asymmetric supercapacitors

Cited by 10 publications

References 40 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

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

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

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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