Morphological and structural analysis of manganese oxide nanoflowers prepared under different reaction conditions

Venkata, Swetha J.; Geetha, A.; Ramamurthi, K.

doi:10.1016/j.apsusc.2018.02.160

Cited by 13 publications

(8 citation statements)

References 29 publications

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“…The HRTEM images of fresh MnO 2 display the morphology of a nanoflower assembled by ultrathin nanosheets (Figure A–C), and the assembly originated from strong interparticle forces due to the high surface energy of small nuclei during the preparation process . The lattice spacing of 0.20 nm reveals that MnO 2 (110) crystal planes are preferably exposed.…”

Section: Resultsmentioning

confidence: 99%

“…25 The HRTEM images of fresh MnO 2 display the morphology of a nanoflower assembled by ultrathin nanosheets (Figure 3A−C), and the assembly originated from strong interparticle forces due to the high surface energy of small nuclei during the preparation process. 26 The lattice spacing of 0.20 nm reveals that MnO 2 (110) crystal planes are preferably exposed. The nanoflower morphology of MnO 2 is maintained in reduced Ptin-MnO 2 (Figure 3D−F), and the arrow-pointed dots with darker contrast indicate the locations of Pt nanoparticles, which are embedded in MnO 2 .…”

Section: Chemical and Physicalmentioning

confidence: 99%

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Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

et al. 2023

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Formaldehyde (HCHO) is a hazardous pollutant in indoor space for humans because of its carcinogenicity. Removing the pollutant by MnO2-based catalysts is of great interest because of their high oxidation performance at room temperature. In this work, we regulate the Pt–MnO2 (MnO2 = manganese oxide) interaction and interface by embedding Pt in MnO2 (Pt-in-MnO2) and by dispersing Pt on MnO2 (Pt-on-MnO2) for HCHO oxidation over Pt–MnO2 catalysts with trace Pt loading of 0.01 wt %. In comparison to the Pt-in-MnO2 catalyst, the Pt-on-MnO2 catalyst has a higher Brunauer–Emmett–Teller surface area, a more active lattice oxygen, more oxygen vacancy activating more dioxygen molecules, more exposed Pt atoms, and noninternal diffusion of mass transfer, which contribute to the higher HCHO oxidation performance. The HCHO oxidation performance is stable over the Pt–MnO2 catalysts under high space velocity and high moisture humidity conditions, showing great potential for practical applications. This work demonstrates a more effective Pt-dispersed MnO2 catalyst than Pt-embedded MnO2 catalyst for HCHO oxidation, providing universally important guidance for metal–support interaction and interface regulation for oxidation reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Chemical and Physicalmentioning

confidence: 99%

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

et al. 2023

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“…Manganese oxides have diverse oxidation states such as Mn 2 O 3 , MnO, MnO 2 , Mn 5 O 8 , and Mn 3 O 4 , and can be used in a variety of applications 21. Manganese oxide NP are inexpensive, environmentally friendly, have a high surface area and can be prepared quickly and easily 20, 22. Different types of manganese oxides were used mostly to degrade proteins; so, they can be used as a membrane additive to produce antiviral membranes 23.…”

Section: Introductionmentioning

confidence: 99%

Separation of Diclofenac Sodium Using Polysulfone Membranes Incorporated with Manganese Nanoparticles

et al. 2023

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Membranes are employed in various applications, including pharmaceutical waste separation, owing to their operability, high removal capacity, and cost‐effectiveness. However, membrane fouling is an influential factor that reduces their efficiency. Since the addition of hydrophilic inorganic components has been shown to reduce membrane fouling, the present work focuses on manganese (MnO2, Mn2O3) nanoparticles (NP) in polysulfone (PSF) casting solutions to prepare mixed‐matrix membranes for separating diclofenac (DCF) sodium from an aqueous solution. The membranes were characterized using microscopic and spectroscopic techniques, thermogravimetric analysis, and by elucidating the internal membrane specific area, contact angle, and mechanical properties. The synthesized NP were characterized by X‐ray diffraction and transmission electron microscopy analysis. The concentrations of DCF sodium measured in the feed and filtrate solutions showed that the PSF/Mn2O3 membrane provided the highest permeate flux with good DCF removal of 98.4 %. Mechanical testing indicated that higher tensile strength was obtained when embedding MnO2 NP in the PSF membrane matrix. Contact angle measurements showed an improvement of the surface hydrophilicity when blending the PSF casting solution with MnO2 NP. The fouling test indicated that the PSF/Mn2O3 membrane provided the best antifouling properties. Thus, NP addition enhanced the porosity, antifouling characteristics, hydrophilicity, and water flux of the fabricated membranes.

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“…Currently, the most used electrocatalyst for ORR and OER reactions is platinum. However, the high cost and susceptibility to catalyst poisoning has limited their commercialization in zinc-air batteries [13][14][15][16][17][18][19][20][21]. Hence, the search for an economical and viable catalyst with high catalytic performance as a potential component in zinc-air batteries has become the key for electrochemistry researchers.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

et al. 2020

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An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc–air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc–air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31% higher than the nanowires and reaches up to 30% of the theoretical discharge capacity of the zinc–air battery.

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Morphological and structural analysis of manganese oxide nanoflowers prepared under different reaction conditions

Cited by 13 publications

References 29 publications

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Separation of Diclofenac Sodium Using Polysulfone Membranes Incorporated with Manganese Nanoparticles

Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

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Morphological and structural analysis of manganese oxide nanoflowers prepared under different reaction conditions

Cited by 13 publications

References 29 publications

Regulating the Pt–MnO2 Interaction and Interface for Room Temperature Formaldehyde Oxidation

Regulating the Pt–MnO2 Interaction and Interface for Room Temperature Formaldehyde Oxidation

Separation of Diclofenac Sodium Using Polysulfone Membranes Incorporated with Manganese Nanoparticles

Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

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Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation