3D hierarchical CoWO4/Co3O4 nanowire arrays for asymmetric supercapacitors with high energy density

Zhang, Mingchang; Fan, Huiqing; Zhao, Nan; Peng, Haijun; Ren, Xiaoyong; Wang, Weijia; Li, Hua; Chen, Guangyu; Zhu, Yangni; Jiang, Xinbiao; Wu, Peng

doi:10.1016/j.cej.2018.04.113

Cited by 205 publications

(47 citation statements)

References 43 publications

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“…Presence of robust light absorption capacity, fast interfacial redox rate, among various nanostructures; two-dimensional (2D) nanostructures tend to achieve these features more efficiently [11][12][13][14]. 2D nanomaterials also offer electron transportation channels due to reduced junctions and grain boundaries in contrast to other spherical nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

Ikram

Raza

Imran

et al. 2020

Preprint

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Graphene oxide (GO) was obtained through modified hummers method and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5 and 10 wt.%) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-visible (Uv-vis.) spectrophotometer and Photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with Field Emission Scanning Electron Microscope (FESEM). Homogeneous distribution, size and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of High-Resolution Transmission Electron Microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-vis. spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

Ikram

Raza

Imran

et al. 2020

Preprint

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“…nanoparticles, and also their novel applications in heat ray shielding, indoor energy saving, electronic conductivity, bio thermal therapy and electrochromism. Beyond the above compounds, various tungstate nanomaterials, such as Bi 2 WO 6 , ZnWO 4 , CdWO 4 , CoWO 4 , are also actively studied for optical functionalities and energy-storage [13][14][15][16][17][18]. MWO 4 tungstate, where M 2+ is a divalent metal cation, is considered promising for photoelectrodes, photocatalysis, scintillation, and optical fiber applications [19].…”

Section: Introductionmentioning

confidence: 99%

Effects of tungsten source and tartrate additive on the microstructure and photoluminescence of hydrothermally crystallized ZnWO4

Zhu

et al. 2019

Tungsten

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Tungstate source and tartrate (Tar 2−) additive were examined for their influences on the hydrothermal formation and characteristics of ZnWO 4 nanocrystals. It was clearly shown that quasi-equiaxed nanocrystallites of ~ 50-100 nm in diameter and nanorods of ~ 40-50 nm in diameter and up to ~ 700 nm in length can be generated with (NH 4) 10 W 12 O 41 •5H 2 O and K 2 WO 4 •2H 2 O as tungsten sources, respectively. Introducing Tar 2− into the K 2 WO 4 •2H 2 O reaction system effectively transformed the primary crystallites of ZnWO 4 from nanorods into quasi-equiaxed nanocrystals (~ 20-50 nm) and then nanoplates (thickness of ~ 20 nm, lateral size of ~ 200 nm) and, meanwhile, aggregated the crystallites into spheroidal clusters (~ 2-3 µm in diameter) with the increasing Tar 2− /Zn 2+ molar ratio up to ~ 2. Optical spectroscopy revealed that the ZnWO 4 products exhibit broad-band photoluminescence (~ 425-700 nm) through 3 T 1u → 1 A 1g transition of the [WO 6 ] 6− ligand under short ultraviolet excitation and the nanorods show the best luminescence among all tested samples. Calcination at 500 °C may effectively remove the adsorbed Tar 2− species and greatly improve luminescence of the samples synthesized in the presence of Tar 2− .

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“…Application domains of nanostructured materials can be enhanced if it contains porosity , gas storage,, supercapacitor,, biomedical, and various interdisciplinary technological applications ,,…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] Application domains of nanostructured materials can be enhanced if it contains porosity. [3,4] The development of porous substances with enhanced textural properties is an area of prodigious research because of their wide applications in heterogeneous catalysis, chemical separation, sensor technology, [5][6][7][8][9] gas storage, [10,11] supercapacitor, [12,13] biomedical, and various interdisciplinary technological applications. [3,4,14] Porous materials have capability to interact well with bio-molecules that resulted in the development of extensive range of medical, clinical, and other technological developments.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensor Platforms Based on Nanostructured Metal Oxides, and Zeolite‐Based Materials

Prathap

Kaur

Srivastava

2018

The Chemical Record

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Electrochemical sensors have drawn significant attention over the last couple of decades because of their ability to improve detection of organic and inorganic analytes found in the field of biotechnology, environmental sciences, medicine, and food quality control. This personal account summarizes the state‐of‐art research carried out in the construction and evaluation of nanostructured metal oxides and zeolite based electrochemical sensors. Metal oxides and zeolite‐based nanomaterials have many unique and extraordinary properties such as tunable redox activity, surface functionalization ability, optimum conductivity, large surface area, biocompatibility and so forth. In this personal account, the current advances in electrochemical sensor applications of metal oxides, zeolite‐based nanomaterials, and their nanocomposites are described for the single and simultaneous determination of organic & inorganic contaminants present in water bodies, physiological bio‐molecules present in human blood & urine samples, and organic contaminants present in food materials.Moreover, concluding section focuses discussion on the future developments and applications of these materials in various emerging technologies.

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3D hierarchical CoWO4/Co3O4 nanowire arrays for asymmetric supercapacitors with high energy density

Cited by 205 publications

References 43 publications

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

Effects of tungsten source and tartrate additive on the microstructure and photoluminescence of hydrothermally crystallized ZnWO4

Electrochemical Sensor Platforms Based on Nanostructured Metal Oxides, and Zeolite‐Based Materials

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