Thermal behaviour and reactivity of manganese cobaltites MnxCo3 –xO4(0.0 ⩽x⩽1.0) obtained at low temperature

Rojas, R.M.; Vila, E.; García, Óscar J. Martín; Vidales, J. L. Martı́n de

doi:10.1039/jm9940401635

Cited by 49 publications

(39 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…and octahedrally coordinated Co 2? ions, respectively [39]. This FT-IR absorption data confirm the successful formation of phase pure spinel MnCo 2 O 4 in agreement with the XRD studies.…”

Section: Ft-ir Studiessupporting

confidence: 84%

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

et al. 2015

View full text Add to dashboard Cite

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.

show abstract

“…and octahedrally coordinated Co 2? ions, respectively [39]. This FT-IR absorption data confirm the successful formation of phase pure spinel MnCo 2 O 4 in agreement with the XRD studies.…”

Section: Ft-ir Studiessupporting

confidence: 84%

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

et al. 2015

View full text Add to dashboard Cite

show abstract

“…It can be clearly seen that the angular deformation of the adsorbed water molecules band appeared at 1628 cm −1 . The bands at 650 and 561 cm −1 are corresponding to the metal oxide characteristic peaks which revealed the formation of MnCo 2 O 4 compound 39 . The surface morphology of MnCo 2 O 4 was investigated by SEM.…”

Section: Resultsmentioning

confidence: 97%

Synthesis and Characterization of Porous MnCo2O4 for Electrochemical Determination of Cadmium ions in Water Samples

Velmurugan¹,

Chen²

2017

Sci Rep

View full text Add to dashboard Cite

To utilize the maximum activity of nanomaterials, it was specifically synthesized by appropriate physicochemical properties. In that aspect, we have described the synthesis of porous MnCo2O4 by simple chemical route and applied for the selective detection of cadmium (Cd (II)). The as-prepared porous MnCo2O4 was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) adsorption isotherm, X-ray diffraction pattern analysis (XRD), Fourier transform infra-red spectroscopy (FT-IR), energy dispersive X-ray (EDX) and electrochemical techniques. The porous MnCo2O4 exhibited an excellent electrochemical behaviour and good analytical response towards the determination of Cd (II). Those analytical factors such as pH, deposition potential and deposition time are optimized by using differential pulse anodic stripping voltammetry (DPASV). A wide linear concentration range from 2.3 to 120 µg L−1, limit of detection (LOD) of 0.72 µg L−1 and the limit of quantification (LOQ) of 0.91 µg L−1 were achieved for determination of Cd (II). The selectivity of the developed sensor was explored in the presence of co-interfering ions. Also our sensor exhibits a good stability, reproducibility and repeatability. In addition, the practicability of proposed sensor was evaluated for the detection of Cd (II) in real water samples.

show abstract

“…7), where the mass loss of cubic phase within a moderate temperature range (250–800 °C) exceeds that of the corresponding tetragonal phase with the same composition. This difference implies more Mn 4+ reduction to Mn 3+ and higher Mn valence34 in cubic spinels than in tetragonal oxides.…”

Section: Resultsmentioning

confidence: 98%

Phase and composition controllable synthesis of cobalt manganese spinel nanoparticles towards efficient oxygen electrocatalysis

et al. 2015

View full text Add to dashboard Cite

Spinel-type oxides are technologically important in many fields, including electronics, magnetism, catalysis and electrochemical energy storage and conversion. Typically, these materials are prepared by conventional ceramic routes that are energy consuming and offer limited control over shape and size. Moreover, for mixed-metal oxide spinels (for example, CoxMn3−xO4), the crystallographic phase sensitively correlates with the metal ratio, posing great challenges to synthesize active product with simultaneously tuned phase and composition. Here we report a general synthesis of ultrasmall cobalt manganese spinels with tailored structural symmetry and composition through facile solution-based oxidation–precipitation and insertion–crystallization process at modest condition. As an example application, the nanocrystalline spinels catalyse the oxygen reduction/evolution reactions, showing phase and composition co-dependent performance. Furthermore, the mild synthetic strategy allows the formation of homogeneous and strongly coupled spinel/carbon nanocomposites, which exhibit comparable activity but superior durability to Pt/C and serve as efficient catalysts to build rechargeable Zn–air and Li–air batteries.

show abstract

Thermal behaviour and reactivity of manganese cobaltites Mn_xCo_{3 –x}O₄(0.0 ⩽x⩽1.0) obtained at low temperature

Cited by 49 publications

References 18 publications

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

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

Synthesis and Characterization of Porous MnCo2O4 for Electrochemical Determination of Cadmium ions in Water Samples

Phase and composition controllable synthesis of cobalt manganese spinel nanoparticles towards efficient oxygen electrocatalysis

Contact Info

Product

Resources

About