Nano-sized Mn3O4 and β-MnOOH from the decomposition of β-cyclodextrin–Mn: 1. Synthesis and characterization

Najafpour, Mohammad Mahdi; Mostafalu, Ramin; Kaboudin, Babak

doi:10.1016/j.jphotobiol.2015.02.019

Cited by 9 publications

(5 citation statements)

References 43 publications

(59 reference statements)

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“…Alongside, an intense diffraction peak ∼20° pertaining to Ni(OH) 2 is visible, which meant that the correlation between the Ni(OH) 2 and MnOOH phases has not completed, therefore such higher contribution from individual components is discernible . With time in NiMn LDH_4H, the missed peaks in NiMn LDH_2H started to evolve and also the peaks from individual components, that is, MnOOH and Ni(OH) 2 , also started to appear at ∼41.6 and ∼45.4°, respectively, while the lower degree Ni(OH) 2 peak remained more or less the same. , The crystallinity of the LDH phase was significantly improved at 6 h, and the peaks Ni(OH) 2 and MnOOH became less intense with the lower angle peak nearly diminished. The phase in NiMn LDH_6H has a contribution from individual components, but it was very low in comparison to the main phase with no presence of other peaks except two from MnOOH and Ni(OH) 2 .…”

Section: Resultsmentioning

confidence: 99%

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

Sharma

Aman

Omar

2022

ACS Appl. Nano Mater.

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The prolonged reactions for phase and morphology stabilization remain an issue in layered double hydroxides (LDHs), for example, NiMn LDH. The present work proposes a rational strategy for tuning the interfacial surface chemistry in the NiMn LDH phase to obtain grassy-mat-like porous nanoarchitectures. The approach gifts a morphology possessing a high specific surface area available for the ions’ adsorption and desorption, thereby enhancing the extent of reversible reactions. The porous nanoarchitecture displays excellent catalytic activity by reducing p-nitrophenol in just ∼300 s with a rate constant of 0.231 min–1 at a 2 mg mL–1 concentration. Alongside, as a freestanding binder-free supercapacitor electrode, the material delivers a high specific capacitance of ∼568 F g–1 at 1 mA cm–2, which is highest among all NiMn LDH variants prepared at different reaction times. The fabricated symmetric supercapacitor exhibits an excellent energy and a power density of ∼22 W h kg–1 at 1 mA cm–2 and ∼6429 W kg–1 at 10 mA cm–2, respectively. The device retains ∼83% capacitance, at 10 mA cm–2, after 5000 charge–discharge cycles. To the best of our knowledge, this is the first report where NiMn LDH is optimized in a shorter duration and proposed as a competitive bifunctional material for heterogeneous catalysis and supercapacitors.

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Section: Resultsmentioning

confidence: 99%

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

Sharma

Aman

Omar

2022

ACS Appl. Nano Mater.

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“…The water oxidation catalyzed by such Mn oxide composites is usually faster than that for many pure Mn oxide phases [79,80], but similar to or lower than that for layered Mn oxides [81,82].…”

Section: Supportsmentioning

confidence: 97%

From manganese complexes to nano-sized manganese oxides as water-oxidizing catalysts for artificial photosynthetic systems: Insights from the Zanjan team

Najafpour

2016

Comptes Rendus. Chimie

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“…Although chemical bonds are also broken in this case, this preparation is closer to the BM assisted preparation of CD complexes in many ways. Nanosized manganese oxides have also been prepared from CD/Mn complexes [ 93 ], however, in this case, the CD was only used to obtain a charrable matrix for the Mn 2 O 3 which was prepared finally at 450 °C.…”

Section: Reviewmentioning

confidence: 99%

Enabling technologies and green processes in cyclodextrin chemistry

Cravotto¹,

Caporaso²,

Jicsinszky³

et al. 2016

Beilstein J. Org. Chem.

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SummaryThe design of efficient synthetic green strategies for the selective modification of cyclodextrins (CDs) is still a challenging task. Outstanding results have been achieved in recent years by means of so-called enabling technologies, such as microwaves, ultrasound and ball mills, that have become irreplaceable tools in the synthesis of CD derivatives. Several examples of sonochemical selective modification of native α-, β- and γ-CDs have been reported including heterogeneous phase Pd- and Cu-catalysed hydrogenations and couplings. Microwave irradiation has emerged as the technique of choice for the production of highly substituted CD derivatives, CD grafted materials and polymers. Mechanochemical methods have successfully furnished greener, solvent-free syntheses and efficient complexation, while flow microreactors may well improve the repeatability and optimization of critical synthetic protocols.

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Nano-sized Mn3O4 and β-MnOOH from the decomposition of β-cyclodextrin–Mn: 1. Synthesis and characterization

Cited by 9 publications

References 43 publications

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

NiMn-Layered Double Hydroxide Porous Nanoarchitectures as a Bifunctional Material for Accelerated p-Nitrophenol Reduction and Freestanding Supercapacitor Electrodes

From manganese complexes to nano-sized manganese oxides as water-oxidizing catalysts for artificial photosynthetic systems: Insights from the Zanjan team

Enabling technologies and green processes in cyclodextrin chemistry

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