Hydrothermal synthesis of novel Mn3O4 nano-octahedrons with enhanced supercapacitors performances

Jiang, Hao; Zhao, Ting; Yan, Chaoyi; Ma, Jan; Li, Chunzhong

doi:10.1039/c0nr00257g

Cited by 187 publications

(110 citation statements)

References 34 publications

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“…[21] Generally, there are two ways to overcome this intrinsic drawback: one way is to design structures that can provide more electroactive sites to promote the electrochemical reaction, such as hollow structures, or those with well defined octahedra and polyhedra with enhanced capacitive behavior. [26][27][28] Another way is form a composite (or hybrid) of Mn 3 O 4 with other components to improve the electrode conductivity. In this case structural control (shape, size, and texture) is somewhat complicated, and involves elaborately adjusting the synthetic parameters and reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors

Wang

et al. 2011

Eur J Inorg Chem

117

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In this work, we describe our efforts to produce Mn3O4–graphene nanocomposites based on a convenient andfeasible solution based synthetic route under mild conditions. According to transmission electron microscopy (TEM) and high angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) results porous Mn3O4 nanocrystals (NCs), 20–40 nm in size, are uniformly deposited on both sides of the graphene nanosheet (GNS) matrix. Significantly, the as‐prepared Mn3O4–graphene nanocomposites exhibit remarkable pseudocapacitive activity including high specific capacitance (236.7 F g–1 at 1 A g–1), good rate capability (133 F g–1 at 8 A g–1), and excellent cyclability (the specific capacitance only decreases by 6.32 % of the initial capacitance after 1000 cycles). The excellent pseudocapacitive performance of the Mn3O4–graphene nanocomposites electrode is probably due to the positive synergistic effects between the Mn3O4 and GNS. Namely, the intimate combination of the conductive graphene network with uniformly dispersed porous Mn3O4 NCs not only greatly improves the electrochemical utilization of Mn3O4, but also increases the double‐layer capacitance of the graphene sheets. These characteristics make this nanocomposite a very promising electrode material for high performance supercapacitors.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors

Wang

et al. 2011

Eur J Inorg Chem

117

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“…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]. Subsequently, to improve the specific capacitance of Mn 3 O 4 , the nanosized particles have been prepared by various methods such as successive ionic layer adsorption and reaction (SILAR) [18], hydrothermal [17,20], solution combustion [21], chemical bath deposition [22], oxidative precipitation [23], sonochemical [24], solvothermal [25], and microwave [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…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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“…Mn 3s spin orbit splitting energy of the samples was calculated to be around 5.2 eV, which corresponds to Mn 3? ions in the compound [42].…”

Section: X-ray Photoelectron Spectroscopy Studiesmentioning

confidence: 99%

Investigation on spinel MnCo2O4 electrode material prepared via controlled and uncontrolled synthesis route for supercapacitor application

et al. 2015

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To analyze the impact of preparation routes on the electrochemical behavior of nanoparticles, manganese cobaltite (MnCo 2 O 4 ) has been synthesized by combustion (MnC-C) and hydrothermal route (MnC-H). The structural properties of synthesized nanoparticles were characterized by X-ray diffractometer studies which confirm the formation of cubic spinel phase with average crystallite size of 26 nm for combustion route prepared and 24 nm for hydrothermal route. The FT-IR spectrum shows two strong bands observed at 651 and 559 cm -1 that are characteristic to stretching vibrations of tetrahedral and octahedral sites of spinel MnCo 2 O 4 compounds. Elemental analysis, oxidation state, and chemical composition of these nanoparticles were examined using X-ray photoelectron spectroscopy. The morphology of synthesized nanoparticles was analyzed by SEM images. Loosely packed flake-like morphology was observed for MnC-H and typical spongy network structure with voids or pores was seen for MnC-C samples. BET analysis reveals the presence of mesopores and micropores in the prepared compounds. Influence of preparation route on capacitor behavior was evaluated by performing electrochemical characterizations such as cyclic voltammetry, chronopotentiometry, and AC impedance analysis. MnC-H exhibits a higher specific capacitance of 671 F g -1 at 5 mV s -1 scan rate compared to 510 F g -1 exhibited by MnC-C electrode material. Excellent capacitance retention of 92 % was demonstrated by MnC-H over 1000 continuous cycling. Results indicate that MnCo 2 O 4 prepared via controlled synthesis conditions (hydrothermal) shows better performance than combustion prepared.

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Hydrothermal synthesis of novel Mn3O4 nano-octahedrons with enhanced supercapacitors performances

Cited by 187 publications

References 34 publications

Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors

Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors

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

Investigation on spinel MnCo2O4 electrode material prepared via controlled and uncontrolled synthesis route for supercapacitor application

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Hydrothermal synthesis of novel Mn3O4 nano-octahedrons with enhanced supercapacitors performances

Cited by 187 publications

References 34 publications

Facile Synthesis of Porous Mn3O4 Nano­crystal–Graphene Nanocomposites for Electrochemical Supercapacitors

Facile Synthesis of Porous Mn3O4 Nano­crystal–Graphene Nanocomposites for Electrochemical Supercapacitors

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

Investigation on spinel MnCo2O4 electrode material prepared via controlled and uncontrolled synthesis route for supercapacitor application

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Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors

Facile Synthesis of Porous Mn₃O₄ Nanocrystal–Graphene Nanocomposites for Electrochemical Supercapacitors