MnO2 ultralong nanowires with better electrical conductivity and enhanced supercapacitor performances

Li, Wenyao; Liu, Qian; Sun, Yangang; Sun, Jianqing; Zou, Rujia; Gao, Li; Hu, Xianghua; Song, Guosheng; Ma, Guanxiang; Yang, Jianmao; Chen, Zhigang; Hu, Junqing

doi:10.1039/c2jm33368f

Cited by 102 publications

(53 citation statements)

References 32 publications

(27 reference statements)

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“…Consider the two example systems explored in this work, manganese oxide and titanium oxide; both their nanoparticles and nanowires have been widely used for catalysis (or photocatalysis), 32 sensing, 6 energy storage 33 or conversion, 34 and so forth. However, in order to have a bulk form structure supports or scaffolds are needed, for example, TiO 2 nanoparticles have been deposited onto a metal grid to photocatalytically decompose organic pollutant in water.…”

Section: Nano Lettersmentioning

confidence: 99%

A Facile Methodology for the Production of In Situ Inorganic Nanowire Hydrogels/Aerogels

Jung

Fang

et al. 2014

Nano Lett.

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Creating inorganic nanowire hydrogels/aerogels using various materials and inexpensive means remains an outstanding challenge despite their importance for many applications. Here, we present a facile methodology to enable highly porous inorganic nanowire hydrogel/aerogel production on a large scale and at low cost. The hydrogels/aerogels are obtained from in situ hydrothermal synthesis of onedimensional (1D) nanowires that directly form a cross-linking network during the synthesis process. Such a method not only offers great simplicity but also allows the interconnecting nanowires to have much longer length. The longer length offers aerogels with remarkable porosity and surface area extremely low densities (as low as 2.9 mg/cm 3 ), are mechanically robust, and can have superelasticity by tuning the synthesis conditions. The nanowires in the hydrogels/aerogels serve both as structural support and active sites, for example, for catalysis or absorption. In this work, we have found that the as-grown hydrogels can be used directly as water filters to remove pollutants such as heavy metal ions and toxic organic contents. Our studies indicate that this method for nanowire hydrogels/aerogels production is not only economical but greatly augmented their applications in environmental, catalysis, sensing, absorption, energy storage, and beyond. KEYWORDS: Inorganic nanowires, hydrogels, aerogels, superelasticity, water purification filters P orous inorganic nanowire hydrogels/aerogels are highly attractive in applications for energy generation and storage, sensing, catalytic conversion, selective absorption and removal, or thermal insulation, and so forth.1−4 General syntheses of the inorganic nanowire aerogels have been demonstrated with template-assisted deposition followed by a template removal step such as metal electrodeposition onto a polymer template, 5 or atomic layer deposition of a metal oxide onto nanocellulose 6 or a copolymer 7 template. However, these methods are complicated and are limited in terms of porosity 8 without collapsing of the three-dimensional (3D) network during the template removal process. Because the pore geometry and pore size play a critical role in the properties and performance of these porous materials, 9 this hampers their utilization for various applications.Previously, we demonstrated that highly porous inorganic nanowire hydrogels/aerogels can be obtained by assembling the nanowires into a cross-linking network from their colloidal suspensions at the transition from semidilute to isotropic concentrated regimes without using templates or supporting materials. 10 The synthesized nanowires were initially dispersed with/without surfactant in ethanol using ultrasonication at a dilute concentration, and then the suspension was transformed into a nanowire gel by evaporating the solvent to reach the gel formation concentration (φ gel = a r −1, where a r is the nanowire aspect ratio, a r = L/d, and L is the nanowire length and d is the diameter).10 For this method, in the case of bri...

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Section: Nano Lettersmentioning

confidence: 99%

A Facile Methodology for the Production of In Situ Inorganic Nanowire Hydrogels/Aerogels

Jung

Fang

et al. 2014

Nano Lett.

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“…The Co-precipitation method is commonly employed because it is cost effective and has so many advantages. Nanostructure manganese dioxide has been considered as an ideal electrode material for energy storage, such as super capacitors (also known as electrochemical capacitors) [2][3][4][5]. MnO 2 is considered as one of the best catalysts due to its low cost and less toxicity, environmental compatibility [6][7][8][9].Among many transition metal oxides, Manganese oxide exhibit different forms of which MnO 2 is the one of the most attractive oxide due to its unique properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of MnO2 Nanoparticles: Study of Structural and Optical Properties

Ganeshan¹,

Ramasundari²,

Elangovan³

et al. 2017

IJSRPAS

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Abstract:Manganese dioxide nanostructures are of considerable importance in technological applications and have been intensively investigated as promising electrode material in primary/secondary batteries and electrochemical capacitors due to their excellent electrochemical properties, low cost, environmentally benign and ease of preparation. MnO 2 nanoparticles are synthesized using Co-Precipitation method. The structural and optical characterization was carried out using Powder X-ray Diffraction method, Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopy, The powder X-ray Diffraction studies revealed the polycrystalline nature of MnO 2 nanoparticles. SEM images showed that the particles are almost spherical with varying sizes. Energy Dispersive X-ray Spectroscopy analysis confirms the presence of Manganese and Oxygen.

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“…Many transition metal oxides, such as MnO 2 , Fe 3 O 4 , SnO 2 , V 2 O 5 and so on, have been employed as electrode materials for supercapacitors and LIBs [6][7][8][9]. Among the transition metal oxides containing metal atoms capable of various valence states, V 2 O 5 is one of the most promising electrode materials for supercapacitors and LIBs due to its high energy density, ease of synthesis, low cost and abundant resources [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of graphene/vanadium oxide nanocomposite monolith and its electrochemical performance

Deng

et al. 2015

Materials Research Bulletin

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MnO2 ultralong nanowires with better electrical conductivity and enhanced supercapacitor performances

Cited by 102 publications

References 32 publications

A Facile Methodology for the Production of In Situ Inorganic Nanowire Hydrogels/Aerogels

A Facile Methodology for the Production of In Situ Inorganic Nanowire Hydrogels/Aerogels

Synthesis and Characterization of MnO2 Nanoparticles: Study of Structural and Optical Properties

Preparation of graphene/vanadium oxide nanocomposite monolith and its electrochemical performance

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