Top-down synthesis of sponge-like Mn<sub>3</sub>O<sub>4</sub>at low temperature

Lu, Wangwei; He, Kay; Zhao, Gaoling; Song, Bin; Zhou, Jing; Dong, Weixia; Han, Guangting

doi:10.1039/c9ra03893k

Cited by 6 publications

(7 citation statements)

References 36 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At this temperature, oxides of Mn will begin to form instead. Similarly, in the synthesis of Mn3O4 structures by [17], two stages decomposition of manganese formate occur. The weight loss associated with the decomposition occurs between 180 °C and 268 °C.…”

Section: Solubility Of Mn In Zno Nanocrystallites Using Wet Chemical mentioning

confidence: 99%

Solubility of Mn in ZnO Nanocrystallites using Wet Chemical Synthesis

et al. 2019

View full text Add to dashboard Cite

There is a substantial amount of literature dealing with many aspects of synthesis and characterization of pure and doped binary compounds including Mn-doped ZnO which has been widely studied due to its superb properties as a dilute magnetic semiconductor (DMS). Aspects concerning doping limits for these compounds is an important stage in the search for new materials. Samples of Zn1-xMnxO nanocrystal were synthesized at temperatures of 180 °C and 200 °C using wet or liquid phase synthesis method. Dopant concentrations x=0.5, 1, 1.5, 2, 2.5, 5, 10, 20, 30, 40 and 50 per cent were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view to determining the onset of secondary phases and hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at temperature of 200 °C is realized at x <20%. For samples synthesized at temperature of 180 °C, the solubility limit is x <0.5%.

show abstract

Section: Solubility Of Mn In Zno Nanocrystallites Using Wet Chemical mentioning

confidence: 99%

Solubility of Mn in ZnO Nanocrystallites using Wet Chemical Synthesis

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In addition to the mild reaction conditions, no posterior thermal treatment step was required for the fabrication of Mn 3 O 4 , in opposition to several multistep synthesis routes reported in the literature, which required reaction temperatures above 150 °C and/or thermal annealing. 28,29 TEM and SEM characterization of the MnO 2 -based nanomaterials synthesized at room temperature (Figures 1C,D and S1A) reveals that they present identical nanosheetlike morphology, regardless of the absence or presence of CA during their fabrication. 30 In the case of Mn 3 O 4 -based samples, the addition of CA during the nanomaterial fabrication at a higher temperature (100 °C) induces a change of the morphology from cubic to spherical (Figures 1E,F and S1B) and a major reduction of the particles' dimensions, leading to an average particle size of ∼17 ± 5 nm (by TEM).…”

Section: Morphological and Structural Characterization Of Mn X O Y -B...mentioning

confidence: 98%

Fabrication of CNT-N@Manganese Oxide Hybrid Nanomaterials through a Versatile One-Pot Eco-Friendly Route toward Engineered Textile Supercapacitors

Teixeira,

Costa,

Guedes

et al. 2024

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

The expansion of the Internet of Things market and the proliferation of wearable technologies have generated a significant demand for textile-based energy storage systems. This work reports the engineered design of hybrid electrode nanomaterials of N-doped carbon nanotubes (CNT-N) functionalized with two types of manganese oxides (MOs)�birnessite (MnO 2 ) and hausmannite (Mn 3 O 4 )�and their application in solid-state textilebased hybrid supercapacitors (SCs). A versatile citric acid-mediated eco-friendly one-pot aqueous precipitation process is proposed for the fabrication of the hybrids. Remarkably, different types of MOs were obtained by simply changing the reaction temperature from room temperature to 100 °C, without any post-thermal treatment. Asymmetric textile SCs were developed using cotton fabrics coated with CNT-N and the hybrids as textile electrodes, and poly(vinyl) alcohol/orthophosphoric acid as the solid-gel electrolyte. The asymmetric devices presented enhanced energy storage performance relative to the symmetric device based on CNT-N and excellent cycling stability (>96%) after 8000 charge/discharge cycles owing to synergistic effects between CNT-N and the MOs, which endowed nonfaradaic and pseudocapacitive features to the SCs. The asymmetric SC based on CNT-N@MnO 2 featured 47% higher energy density and comparable power density to the symmetric CNT-N-based device (8.70 W h cm −2 at 309.01 μW cm −2 vs. 5.93 W h cm −2 at 346.58 μW cm −2 ). The engineered hybrid CNT-N@MO nanomaterials and the eco-friendly citric acid-assisted one-pot precipitation route open promising prospects not only for energy storage, but also for (photo)(electro)catalysis, wastewater treatment, and (bio)sensing.

show abstract

“…Large sponge-like structures with crystallographic symmetry can be obtained by simply increasing the reaction time. 126 When compared to metal oxides, metal sulphides present remarkable properties such as large specific capacity, tuneable electronic, optical and chemical properties, minimum redox potential, and enhanced volume expansion. 127 The photoelectrochemical performance of CuInS 2 relies on their nanostructure, but the fabrication of 3-D microspheres that show desirable results is still challenging.…”

Section: Synthesis Of Nanospongesmentioning

confidence: 99%