Nanosize Mn3O4 (Hausmannite) by microwave irradiation method

Apte, Sanjay K.; Naik, Sonali D.; Sonawane, Ravindra S.; Kale, Bharat B.; Pavaskar, N. R.; Mandale, A.B.; Das, B. K.

doi:10.1016/j.materresbull.2005.08.028

Cited by 111 publications

(68 citation statements)

References 20 publications

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“…Generally, the specific capacitance of the Mn 3 O 4 mainly depends upon various parameters such as specific surface area [9], preparation conditions [17], synthesis method [16][17][18][19][20][21][22][23][24][25][26][27][28][29], active materials loading [30], morphology [31], conductive additives (carbon, CNT, Graphene) [32][33][34], electrolyte concentration [22], and potential window [30,35]. Conventionally, the oxides (MnO 2 , Mn 2 O 3 ), carbonate (MnCO 3 ), nitrate (Mn(NO 3 ) 2 ), and sulfate (MnSO 4 ) salts of manganese are heated at above 1000°C to form a Mn 3 O 4 tetragonal structure [25,36].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of microwave-assisted reflux-synthesized Mn3O4 nanoparticles in different electrolytes for supercapacitor applications

2012

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The nanosized Mn 3 O 4 particles were prepared by microwave-assisted reflux synthesis method. The prepared sample was characterized using various techniques such as X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), Raman analysis, and transmission electron microscopy (TEM). Electrochemical properties of Mn 3 O 4 nanoparticles were investigated using cyclic voltammogram (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge analysis in different electrolytes such as 1 M KCl, 1 M Na 2 SO 4 , 1 M NaNO 3 , and 6 M KOH electrolytes. XRD pattern reveals the formation of single-phase Mn 3 O 4 nanoparticles. The FT-IR and Raman analysis also assert the formation of Mn 3 O 4 nanoparticles. The TEM image shows the spherical shape particles with less than 50 nm sizes. Among all the electrolytes, the Mn 3 O 4 nanoparticles possess maximum specific capacitance of 94 F g -1 in 6 M KOH electrolyte calculated from CV. The order of capacitance obtained by various electrolytes is 6 M KOH [ 1 M KCl [ 1 M NaNO 3 [ 1 M Na 2 SO 4 . The EIS and galvanostatic charge-discharge results further substantiate with the CV results. The cycling stability of Mn 3 O 4 electrode reveals that the prepared Mn 3 O 4 nanoparticles are a suitable electrode material for supercapacitor application.

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Section: Introductionmentioning

confidence: 99%

Electrochemical properties of microwave-assisted reflux-synthesized Mn3O4 nanoparticles in different electrolytes for supercapacitor applications

2012

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“…Tetramanganese oxides (Mn 3 O 4 ) are particularly used as main sources of ferrite materials [5] and applied in numerous industrial fields such as magnetic [6], electrochemical [7], and catalysis [8,9]. The particle size and morphology may be controlled by using various methods including solvothermal/hydrothermal [10,11], vapor phase growth [12], vacuum calcining precursors [13], thermal decomposition [14], ultrasonic, gamma, and microwave irradiation [15][16][17], and chemical liquid homogeneous precipitation [18]. Therefore, Mn 3 O 4 compounds show distinct shapes including nanoparticles [19], nanorods [20], nanowires [21], and tetragonal particles [22].…”

Section: Introductionmentioning

confidence: 99%

Mn3O4 Nanoparticles: Synthesis, Characterization, and Dielectric Properties

Dhaouadi¹,

Ghodbane²,

Hosni

et al. 2012

ISRN Spectroscopy

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Mn 3 O 4 nanoparticles were prepared by a simple chemical route using cetyltetramethylammonium bromide (CTAB) as a template agent. Mn 3 O 4 nanocrystals present an octahedral shape, and their crystallite size varies between 20 and 80 nm. They were characterized by XRD, SEM, DTA/TG, and IR spectroscopy. XRD studies confirm the presence of a highly crystalline Mn 3 O 4 phase. The Rietveld refinement of the X-ray diffraction data confirms that Mn 3 O 4 nanoparticles crystallize in the tetragonal system with space group I41/amd. DTA/TG and XRD measurements demonstrate the phase transition toward a spinel structure between 25 and 700 • C. The electrical conductivity increases between 80 and 300 • C, suggesting a semiconducting behaviour of Mn 3 O 4 . Both dielectric dispersion (ε ) and dielectric loss (ε ) were investigated from 80 and 300 • C in the frequency range of 10 Hz-13 MHz. The dielectric properties showed typical dielectric dispersion based on the Maxwell-Wagner model.

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“…Firstly, Fig. 4(a) (Chiganez and Ishikawa, 2000;Álvarez-Galván et al, 2004;Han et al, 2006;Kang et al, 2007;Delimaris and Ioannides, 2008;Davar et al, 2009) and that for Mn 2p3/2 in Mn 3 O 4 is situated between 641.6-641.8 eV (Chiganez and Ishikawa, 2000;Apte et al, 2006;Han et al, 2006) led to difficulty in peak deconvolution. However, it is still reasonable to infer that the sorbent did contain Mn 2 O 3 and Mn 3 O 4 because of previous XRD characterization (Fig.…”

Section: Dechlorination Experimentsmentioning

confidence: 99%

High-Temperature Cleaning for Chlorine-Containing Coal Gas by Supported Manganese Oxide Sorbent

Tseng

Wang

Chu

2012

Aerosol Air Qual. Res.

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This research aimed to achieve HCl removal for chlorine-containing hot coal gas by using supported oxide sorbents in a fixedbed reactor at 673-873 K. Mn 2 O 3 /SiO 2 was chosen as the optimal sorbent to eliminate chlorine species, after thermodynamic screening of the dechlorination potential of sorbents based upon various metals. The dechlorination experiments and results of the ICP, BET, XRD, XPS, and FTIR analyses provided in-depth views of the reaction chemistry behind the complex system of HCl removal in a simulated syngas containing 3,000 ppm HCl, 25 vol% CO, 15 vol% H 2 , and N 2 . When the sorbent composed of 23 wt% Mn 2 O 3 /SiO 2 came into contact with HCl, CO, and H 2 , the reaction mechanism contained two paths. At lower temperatures Mn 2 O 3 tended to react with HCl, while at higher temperatures it might first be reduced into Mn 3 O 4 and then react with HCl. The probable products from the reaction (Mn 2 O 3 and HCl or Mn 3 O 4 and HCl) are MnCl 2 , Cl 2 , and H 2 O. That is, as the reaction temperature increased, the second path started to become more important. The final product of this reaction might also include metallic manganese in addition to MnCl 2 . Furthermore, when the temperature increased, the equilibrium constants of all the reactions reduced, and subsequently resulted in the decreasing sorbent performance.

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Nanosize Mn3O4 (Hausmannite) by microwave irradiation method

Cited by 111 publications

References 20 publications

Electrochemical properties of microwave-assisted reflux-synthesized Mn3O4 nanoparticles in different electrolytes for supercapacitor applications

Electrochemical properties of microwave-assisted reflux-synthesized Mn3O4 nanoparticles in different electrolytes for supercapacitor applications

Mn3O4 Nanoparticles: Synthesis, Characterization, and Dielectric Properties

High-Temperature Cleaning for Chlorine-Containing Coal Gas by Supported Manganese Oxide Sorbent

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