Investigation on structural, optical and photocatalytic activity of CoMn2O4 nanoparticles prepared via simple co-precipitation method

Abel, M. John; Venkatachalam, Archana; Pramothkumar, A.; Senthilkumar, N.; Jothivenkatachalam, Kandasamy; Jesuraj, Joseph Prince

doi:10.1016/j.physb.2020.412349

Cited by 36 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 28,29 ] The peaks at 493 cm −1 and around 603 cm −1 are consistent with the Mn–O breathing mode of the octahedral site and the Co–O stretching vibration of the tetrahedral site, respectively. [ 23 ] Broad absorption bands of 3400 and 1600 cm −1 are assigned to adsorbed H 2 O molecules. [ 30 ] The absorption peaks around 1150 and 1400 cm −1 are caused by C–O species formed after carbonization of residual polyvinyl pyrrolidone (PVP) during synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…05–0667). [ 23,24 ] The characteristic peaks intensity of the Cu 2 O in Cu 2 O@CoMn 2 O 4 ‐ x nanoreactors decrease with the prolongation of etching time, indicating that the Cu 2 O particles gradually became smaller and were encapsulated by other substances. Notably, the characteristic peaks of CoMn 2 O 4 were not detected in all Cu 2 O@CoMn 2 O 4 ‐ x nanoreactors, which may be because of the amorphous structure of CoMn 2 O 4 .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

Bai

Fan

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Hollow nanoreactors show great potential in catalysis due to the void-confinement effect. Yet few studies have investigated the void-confinement effect of hollow nanoreactors on intermediates. Herein, electrochemical NO reduction to NH 3 (ENOR) is used as a probe reaction to study the void-confinement effect of hollow Cu 2 O@CoMn 2 O 4 nanoreactors on intermediates. Combined with the results of catalytic activity, H 2 -treated in situ diffusion Fourier transform infrared spectroscopy and the finite-element method simulation confirm that the void-confinement effect on the intermediate is the main reason for enhanced ENOR efficiency. Additionally, theoretical calculations also show that the Cu sites of Cu 2 O@CoMn 2 O 4 nanoreactors are favorable for the formation of *NOH intermediates. This work not only gives an insight into void-confinement effect of hollow nanoreactors on intermediates but also provides a valuable strategy for improving ENOR.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

Bai

Fan

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The photocatalytic assessment was studied by considering the achieved results with low dye concentration of MG as given in Table 3 [55][56][57][58][59][60][61][62][63][64][65][66][67][68]. And the obtained results are equal or superior to the reported works in terms of performance, low-cost fabrication, simple and green nature of material synthesis approach.…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

A green approach for the preparation of ZnO@C nanocomposite using agave americana plant extract with enhanced photodegradation

Jakhrani¹,

Tahira²,

Bhatti³

et al. 2022

Nanotechnology

View full text Add to dashboard Cite

The present study demonstrates the crucial role of agave americana extract in enhancing the optical properties of zinc oxide (ZnO) through thermal treatment method. Various analytical and surface science techniques have been used to identify the morphology, crystalline structure, chemical composition, and optical properties, including scanning electron microscopy (SEM), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), X-ray spectroscopy (EDS) and UV-visible spectroscopy techniques. The physical studies revealed the transformation of ZnO nanorods into nanosheets upon addition of an optimized amount of agave americana extract, which induced large amount of amorphous carbon deposited onto ZnO nanostructures as confirmed by HRTEM analysis. The use of increasing amount of americana extract has significantly reduced the average crystallite size of ZnO nanostructures. The resultant hybrid system of C@ZnO has produced a significant effect on the ultraviolet light-assisted photodegradation of malachite green (MG) dye. The photocatalyst dose was fixed at 10 mg for each study whereas the amount of agave americana extract and MG dye concentration are varied. The functionality of hybrid system was greatly enhanced when the amount of agave americana extract increased while dye concentration kept at lower level. Ultimately, almost 100% degradation efficiency was achieved via the prepared hybrid material, revealing combined contribution from synergy, stabilization of ZnO due to excess of carbon together with the high charge separation rate. The obtained results suggest that the driving role of agave americana extract for surface modification of photocatalyst can be considered for other nanostructured photocatalysts.

show abstract

“…In recent years, various synthesis methods such as facile solvothermal route [17], chemical spray pyrolysis [18,19], chemical vapour deposition [20,21], sol-gel [22], hydrothermal [23,24], and simple precipitation [25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Co₃O₄ spinel nanowall: understanding the growth mechanism and properties

Barala,

Panda,

Gangopadhyay

2024

Phys. Scr.

View full text Add to dashboard Cite

Formation of spinel tricobalt tetraoxide (Co3O4) nanostructures through a controlled thermal oxidation process is discussed here. Thin films of high purity cobalt (Co) were deposited on glass/quartz substrates using an electron beam (E-beam) evaporation technique. Thermal oxidation of the as-deposited Co thin films was carried out at various oxidation temperatures (400°C to 600°C) for different durations (5 hours to 15 hours) to grow various oxide nanostructures. Different surface characterizations techniques were used to investigate the structure, chemistry and electronic properties of the as-grown cobalt oxide nanostructures. X-ray diffraction analysis revealed the presence of the CoO phase along with the Co3O4 phases at relatively lower oxidation temperature. However, the Co3O4 phase becomes more predominant for longer oxidation durations at higher oxidation temperatures. Field emission scanning electron microscopy analysis showed a surface morphological transition from nanowalls to nanograins with an increase in the oxidation temperature. The surface electrical conductivity of the oxidized Co films is also increased for higher oxidation temperature and/or duration mainly due to the oxide phase purity and larger particle sizes. Ultraviolet–visible spectroscopy indicated two distinct optical energy bandgaps, which effectively decreased with an increase in the oxidation temperature and duration. Raman spectroscopy identified five different Raman-active modes corresponding to the Co3O4 phase, with the F2g mode dominating at higher temperatures. All these findings provide clear insights into the structural, electrical, chemical and optical properties of cobalt oxide thin films. Moreover, it provides a mechanism on how to grow 2D nanowalls morphology of Co3O4 films which can further be used in energy, sensor or catalytic applications.

show abstract

Investigation on structural, optical and photocatalytic activity of CoMn2O4 nanoparticles prepared via simple co-precipitation method

Cited by 36 publications

References 43 publications

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

A green approach for the preparation of ZnO@C nanocomposite using agave americana plant extract with enhanced photodegradation

Synthesis and characterization of Co₃O₄ spinel nanowall: understanding the growth mechanism and properties

Contact Info

Product

Resources

About

Investigation on structural, optical and photocatalytic activity of CoMn2O4 nanoparticles prepared via simple co-precipitation method

Cited by 36 publications

References 43 publications

Hollow Cu2O@CoMn2O4 Nanoreactors for Electrochemical NO Reduction to NH3: Elucidating the Void‐Confinement Effects on Intermediates

Hollow Cu2O@CoMn2O4 Nanoreactors for Electrochemical NO Reduction to NH3: Elucidating the Void‐Confinement Effects on Intermediates

A green approach for the preparation of ZnO@C nanocomposite using agave americana plant extract with enhanced photodegradation

Synthesis and characterization of Co3O4 spinel nanowall: understanding the growth mechanism and properties

Contact Info

Product

Resources

About

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

Hollow Cu₂O@CoMn₂O₄ Nanoreactors for Electrochemical NO Reduction to NH₃: Elucidating the Void‐Confinement Effects on Intermediates

Synthesis and characterization of Co₃O₄ spinel nanowall: understanding the growth mechanism and properties