Controlled-synthesis of β-MnO2 nanorods through a γ-manganite precursor route

Hao, Zhifeng; Jiang, Yi; Yi, Mingming; Zhang, Yingming

doi:10.1016/j.matchemphys.2019.121733

Cited by 18 publications

(4 citation statements)

References 30 publications

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“…The worldwide ban accompanied by utilizing toxic antifouling paints have driven modern research toward eco-friendly solutions particularly, FR technology [61][62][63][64][65][66][67] . Controlling the size and morphology of nanomaterials can improve the performance of nanocomposite [68][69][70] . The Prevention of fouling attachments and reduction of fouling-coating adhesion strength are the mechanisms employed by FR self-cleaning surfaces [32,71,72] (Figure 6).…”

Section: Self-cleaning Nanocomposites For Fouling Release Coatingsmentioning

confidence: 99%

Superhydrophobic Self-cleaning Surfaces in Nature

Mohammed S.

2020

NAT

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A global interest was awarded to study the natural superhydrophobic surfaces since the description of the Lotus Effect by Barthlott and Neinhuis in 1997. Natural biomimetic surface merits of micro/nano-roughness, water contact ˃ 150°, sliding angles ˂10°, and minimized free-energy characteristics would motivate the dynamic fabrication of superhydrophobic surfaces. This critical review introduces an architectural panorama of numerous structural designs of natural superhydrophobic surfaces. Also, it discussed the fundamentals of self-cleaning and wetting theories to develop superhydrophobic structures. This progress review concentrates on superhydrophobic materials' applications for self-cleaning marine antifouling surfaces. It introduced an in-depth understanding of the structural design-superhydrophobic property relationship of the natural nano-wettable surfaces. It is technically first to shed light on the inner basics and platform for surface non-wettability and facilitates the way for design biomimetic self-cleaning antifouling surfaces.

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Section: Self-cleaning Nanocomposites For Fouling Release Coatingsmentioning

confidence: 99%

Superhydrophobic Self-cleaning Surfaces in Nature

Mohammed S.

2020

NAT

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“…[17][18][19][20][21][22][23][24][25][26][27] MnOOH, as a trivalent hydroxide polycrystalline material stable at room temperature with easy preparation and flexible structure, as well as higher conductivity (10 À 4 -10 À 5 S/cm) compared to MnO 2 , is considered a promising candidate for supercapacitor electrode materials. [28][29][30][31] MnOOH has a structural unit based on [MnO 6 ] octahedra, which form tunneled or layered alkaline manganese oxide crystalline compounds by means of co-prisms or co-angles between these [MnO 6 ] octahedra. According to the different internal structures, MnOOH can be classified into α, β, and γ crystal types, and among these three crystalline types, γ-MnOOH has the most stable thermodynamic properties, showing a (1×1) tunneling structure with H atoms located in the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemical Properties of One‐Dimensional γ‐MnOOH Nanorods

Zhao,

Li,

Zhang

2024

ChemistrySelect

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MnOOH has received much attention from researchers as a supercapacitor electrode material. In this article, one‐dimensional γ‐MnOOH nanorods were prepared by the hydrothermal method using the redox reaction between MnO4− and Mn2+, and the effects of temperatures on the crystalline phases and electrochemical properties of the samples were investigated. The materials were characterized using XRD, FT‐IR, SEM, TEM, Raman and XPS; electrochemical properties were tested using CV, GCD and EIS. The results show that the reaction temperature plays an important role in the generation of γ‐MnOOH. The samples were pure phases of γ‐MnOOH (M‐140) at the reaction temperature of 140 °C, showing interlaced nanorod morphology, and when the reaction temperature was increased to 180 °C, a mixed phase of MnOOH and Mn3O4 appeared. In contrast, the electrochemical performance of γ‐MnOOH nanorods (M‐140) was superior to the other samples, reaching a specific capacitance of 221 F/g at a current density of 0.2 A/g. The capacitance retention was 93.8 % after charging and discharging the M‐140 2000 times at a current density of 6 A/g. Supercapacitors assembled with γ‐MnOOHand activated carbon (AC) have excellent energy storage performance, and a high energy density of 40.6 Wh/kg is obtained at a power density of 196.7 W/kg.

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“…7,8 Based on various redox reactions, MnO 2 materials can be successfully prepared by several methods, such as sol-gel, 9 solid-state reaction, 10 hydrothermal, [11][12][13] and precursor routes. 14 Compared to these synthetic methods, the microwave-assisted route is a very fast and effective method to synthesize MnO 2 materials. Additionally, microwave irradiation has been used to synthesize porous materials and nanocrystalline particles.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

Cuéllar-Herrera

Arce-Estrada

Romero‐Serrano

et al. 2021

J. Electron. Mater.

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Two hydrothermal techniques under microwave irradiation were used to synthesize γ-MnO2 from 90°C to 150°C in 10−30 min. The first technique is based on reducing KMnO4 with MnSO4, and the second one involves liquid-phase oxidation between MnSO4 and (NH4)2S2O8. The structures and morphologies of the samples were analyzed using X-ray diffraction, scanning electron microscopy, and N2 physisorption measurements. The electrochemical properties were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The γ-MnO2 materials obtained by the first technique mainly exhibited nanorods with diameters of 40–60 nm, and the samples obtained by the second technique showed flower-like microspheres with diameters of 1−2 µm; each flower was composed of nanosheets with a thickness of 10−20 nm. The processing time directly depends on the size of the nanorods. The sample synthesized by the first technique at 150°C and 10 min has the highest specific surface area of up to 59.08 m2 g−1 and mean pore diameter of 34.11 nm. Furthermore, this sample exhibits a near-rectangular cyclic voltammetry curves and high specific capacitance of 331.3 F g−1 in 0.1 M Na2SO4 solution at 5 mV s−1 scan rate. Graphic abstract

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Controlled-synthesis of β-MnO2 nanorods through a γ-manganite precursor route

Cited by 18 publications

References 30 publications

Superhydrophobic Self-cleaning Surfaces in Nature

Superhydrophobic Self-cleaning Surfaces in Nature

Synthesis and Electrochemical Properties of One‐Dimensional γ‐MnOOH Nanorods

Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

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