Hydrothermal preparation of hematite nanotubes/reduced graphene oxide nanocomposites as electrode material for high performance supercapacitors

Nathan, D. Muthu Gnana Theresa; Boby, S. Jacob Melvin

doi:10.1016/j.jallcom.2017.01.070

Cited by 46 publications

(6 citation statements)

References 51 publications

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“…In the latest years, by virtue of its appealing properties (ubiquity, high abundance, low-cost, environmental friendliness, nontoxicity, good chemical stability, small energy band gap), hematite (α-Fe 2 O 3 ) has gained a position of relevance in the scenery of materials suitable for sustainable applications. It is utilized in a wide variety of fields transversally involving biomedics, − environmental remediation, − magnetic data-storage and spintronics, − sensing, − and energy conversion and storage. − …”

Section: Introductionmentioning

confidence: 99%

Structure, Defects, and Magnetism of Electrospun Hematite Nanofibers Silica-Coated by Atomic Layer Deposition

et al. 2020

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In the last years, hematite has been utilized in a plethora of applications. High aspect-ratio nanohematite and hematite/silica core–shell nanostructures are arousing growing interest for applications exploiting their magnetic properties. Atomic layer deposition (ALD) is utilized here to produce SiO2-coated α-Fe2O3 nanofibers (NFs) through two synthetic routes, viz. electrospinning/calcination/ALD or electrospinning/ALD/calcination. The number of ALD cycles (10–100) modulates the coating thickness, while the chosen route controls the final nanostructure. Porous and partially hollow NFs are produced. Their hierarchical structure and the nature and density of the lattice defects and strain are characterized by combining electron microscopy, diffraction, and spectroscopy techniques. The uncoated hematite NFs mostly have surface-related strain, which is attributed to oxygen vacancies/Fe2+ sites. ALD coating causes microstrain release and decrease of surface states. NFs calcined after ALD have extensive bulk strain, which is ascribed to the presence of dislocations throughout the volume of the NF grains. Bulk strain determines the remanent magnetization, whereas both surface and bulk strain influence the coercive field and the thermal behavior across the Morin temperature, including the magnetic memory effect. To the best of the authors’ knowledge, the correlation between lattice defects/strain and magnetic properties of SiO2-coated α-Fe2O3 NFs has never been reported before.

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Section: Introductionmentioning

confidence: 99%

Structure, Defects, and Magnetism of Electrospun Hematite Nanofibers Silica-Coated by Atomic Layer Deposition

et al. 2020

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“…The Preparation of graphene and reduced graphene oxide (rGO) procedure were followed as reported by Muthu et al (2017) [13]. For rGO/ZnFe 2 O 4 nanocomposites, 25 mg of GO were dispersed in 40ml of DI water by ultrasonication for 30 minutes, on the side 1:2 ratio of Zinc (III) nitrate hexahydrate (Zn(NO 3 ) 6H 2 O) and iron III nitrate nonohydrate (Fe(NO 3 ) 3 .9H 2 O) were mixed 40ml of DI water mixed by stirring.…”

Section: Experimental 21 Synthesis Of Rznf Nanocompositesmentioning

confidence: 99%

rGO Sheets/ZnFe2O4 Nanocomposities as an Efficient Electro Catalyst Material for I3−/I− Reaction for High Performance DSSCs

Samson¹,

Bernadsha²,

Winston³

et al. 2022

J Inorg Organomet Polym

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In this paper, Reduced Graphene Oxide (rGO) / ZnFe 2 O 4 (rZnF) nanocomposite is synthesized by a simple hydrothermal method and employed as a counter electrode (CE) material for tri-iodide redox reactions in Dye sensitized solar cells (DSSC) to replace the traditional high cost platinum (Pt) CE. X-ray diffraction analysis (XRD) and High resolution Transmission electron microscopy (HR-TEM), clearly indicated the formation of rZnF nanocomposite and also amorphous rGO sheets were smoothly distributed on the surface of ZnFe 2 O 4 (ZnF) nanostructure. The rZnF-50 CE shows excellent electro catalytic activity toward I 3 − reduction, which has simultaneously been con rmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. A DSSC developed by rZnF-50 CE (η = 8.71%) obtained quite higher than the Pt (η = 8.53%) based CE under the same condition. The superior performances of rZnF-50 CE due to addition of graphene in to Spinel (ZnF) nanostructure results in creation of highly active electrochemical sites, fast electron transport linkage between CE and electrolyte. Thus it's a promising low cost CE material for DSSCs.

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“…Hydrothermal method is an efficient and cost-effective approach for the assembly of metastable crystalline structures [53][54][55][56][57], especially for the heterogeneous structure with solid interface contact [58][59][60][61]. As for the graphene based heterogeneous electrode materials, the use of hydrothermal assembly could effectively reduce the cost, improve the crystallinity, and consolidate the interface contact, and therefore improve the energy storage performance.…”

Section: Hydrothermal Assemblymentioning

confidence: 99%

“…In other cases, hydrothermal assembly could also be used to fabricate the polyaniline (PANI)/graphene [58,63], TiO 2 /graphene [64], Mn 3 O 4 /CeO 2 /graphene [65], α-Fe 2 O 3 /graphene [59], and Mn 3 O 4 /graphene electrode materials [66]. As illustrated in the literatures, the hydrothermal assembly of graphene based heterogeneous electrode materials is usually starting with the graphite oxide (GO), the active electrode materials and/or surfactants, which should be Schematic illustration for ball milling synthesis of Si@SiO x /grapheme anode material [47].…”

Section: Hydrothermal Assemblymentioning

confidence: 99%

Graphene-Based Heterogeneous Electrodes for Energy Storage

Wang¹,

Wang²,

Yang³

et al. 2018

Graphene [Working Title]

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As an intriguing two dimensional material, graphene has attracted intense interest due to its high stability, large carrier mobility as well as the excellent conductivity. The addition of graphene into the heterogeneous electrodes has been proved to be an effective method to improve the energy storage performance. In this chapter, the latest graphene based heterogeneous electrodes will be fully reviewed and discussed for energy storage. In detail, the assembly methods, including the ball-milling, hydrothermal, electrospinning, and microwave-assisted approaches will be illustrated. The characterization techniques, including the x-ray diffraction, scanning electron microscopy, transmission electron microscopy, electrochemical impedance spectroscopy, atomic force microscopy, and x-ray photoelectron spectroscopy will also be presented. The mechanisms behind the improved performance will also be fully reviewed and demonstrated. A conclusion and an outlook will be given in the end of this chapter to summarize the recent advances and the future opportunities, respectively.

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Hydrothermal preparation of hematite nanotubes/reduced graphene oxide nanocomposites as electrode material for high performance supercapacitors

Cited by 46 publications

References 51 publications

Structure, Defects, and Magnetism of Electrospun Hematite Nanofibers Silica-Coated by Atomic Layer Deposition

Structure, Defects, and Magnetism of Electrospun Hematite Nanofibers Silica-Coated by Atomic Layer Deposition

rGO Sheets/ZnFe2O4 Nanocomposities as an Efficient Electro Catalyst Material for I3−/I− Reaction for High Performance DSSCs

Graphene-Based Heterogeneous Electrodes for Energy Storage

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