Synthesize of WO3 thin film supercapacitor and its characterization

Kariper, İ. Afşin; Tezel, Fatma Meydaneri; Gökkuş, Ömür

doi:10.1016/j.physleta.2020.127059

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…No sharp peaks can be detected in the XRD patterns. Amorphous films of WO3 are mentioned beneficial for fabrication of supper capacitors [3] and as anodes for Li-ion batteries [7]. Amorphous films play important role in device fabrication because they are able to provide several advantages over crystalline ones like higher uniformity and better compatibility with flexible substrates [8].…”

Section: Resultsmentioning

confidence: 99%

“…Tungsten trioxide thin films have captured the interest of research societies due to its remarkable signatures in optoelectronics and other sectors of technology. It have been used as electrochromic media [1], as gas sensors [2], as supercapacitors [3] and as non-volatile random access memory devices [4]. In a recent work, coating stainless steel tapes with WO3 and studying its optical and electrical properties have shown that the electrochromic properties and electrical conductivity of the films are significantly improved [1].…”

Section: Introductionmentioning

confidence: 99%

“…The sensing level of the gas can be as low as 1 ppm H2/air [2]. Moreover, WO3 films that are produced by a biochemical bath method showed a capacitance value of 642 F/g associated with power density of 5.6 kW/h suggesting the ability of using these materials as supercapacitors [3]. Furthermore, WO3 films sandwiched between Au and ITO layers demonstrated metal-insulator-metal structure with appreciable resistive-switching properties [4].…”

Section: Introductionmentioning

confidence: 99%

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Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

2022

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Herein, tungsten oxide thin films comprising excess oxygen are treated as optical resonator suitable for gigahertz/terahertz applications. WO3 thin films which are prepared by the thermal evaporation technique under a vacuum pressure of 10 -5 mbar are structurally, compositionally and optically evaluated. The amorphous WO3.33 films which showed high transparency permit electronic transitions within an indirect allowed energy band gap of 3.05 eV. The band gap comprised energy band tails of width of 190 meV. Four dominant dielectric resonators centered in the infrared (IR), visible (VIS) and ultraviolet (UV) ranges of light are detected. Analysis of the optical conductivity in accordance with the Drude-Lorentz approaches have shown that the drift mobility of free holes in this amorphous layer can be as large as 5.61 cm 2 /Vs an as low as 1.59 cm 2 /Vs when exposed to IR and UV light signals, respectively. In addition, the gigahertz/terahertz cutoff frequency (𝑓 𝑐𝑜 ) spectra demonstrated 𝑓 𝑐𝑜 values in the gigahertz frequency domain when exposed to IR light. Excitations with light signals in the VIS and UV spectral ranges allow 𝑓 𝑐𝑜 values that extends from 0.7-40.0 THz. The wide range of tunability of the WO3 dielectric resonators nominates them as dielectric lenses suitable for optical communications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

2022

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“…Supercapacitors, batteries, and fuel cells are the most common electrochemical energy storage devices used for this purpose. Among them, supercapacitors are emphasized because of their excellent power densities, fast charge/discharge, long-term cycling life, cost-effectiveness, good reversibility, and wide working temperature range compared to those of batteries; however, in terms of commercial application, supercapacitors are behind batteries [ 4 , 5 , 6 ]. The fundamental issue of supercapacitors is their lower energy density, especially when compared to batteries.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance of WO3/SnO2 Nanocomposite Electrodes with Redox-Active Electrolytes for Supercapacitors

Morka

Ujihara

2023

IJMS

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For effective supercapacitors, we developed a process involving chemical bath deposition, followed by electrochemical deposition and calcination, to produce WO3/SnO2 nanocomposite electrodes. In aqueous solutions, the hexagonal WO3 microspheres were first chemically deposited on a carbon cloth, and then tin oxides were uniformly electrodeposited. The synthesized WO3/SnO2 nanocomposite was characterized by XRD, XPS, SEM, and EDX techniques. Electrochemical properties of the WO3/SnO2 nanocomposite were analyzed by cyclic voltammetry, galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy in an aqueous solution of Na2SO4 with/without the redox-active electrolyte K3Fe(CN)6. K3Fe(CN)6 exhibited a synergetic effect on the electrochemical performance of the WO3/SnO2 nanocomposite electrode, with a specific capacitance of 640 F/g at a scan rate of 5 mV/s, while that without K3Fe(CN)6 was 530 F/g. The WO3/SnO2 nanocomposite catalyzed the redox reactions of [Fe(CN)6]3/[Fe(CN)6]4− ions, and the [Fe(CN)6]3−/[Fe(CN)6]4− ions also promoted redox reactions of the WO3/SnO2 nanocomposite. A symmetrical configuration of the nanocomposite electrodes provided good cycling stability (coulombic efficiency of 99.6% over 2000 cycles) and satisfied both energy density (60 Whkg−1) and power density (540 Wkg−1) requirements. Thus, the WO3/SnO2 nanocomposite prepared by this simple process is a promising component for a hybrid pseudocapacitor system with a redox-flow battery mechanism.

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Section: Introductionmentioning

confidence: 99%

Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

Qasrawi

Alrub

Daragme

2021

Preprint

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Herein, tungsten oxide thin films comprising excess oxygen are treated as optical resonator suitable for gigahertz/terahertz applications. WO 3 thin films which are prepared by the thermal evaporation technique under a vacuum pressure of 10 -5 mbar are structurally, compositionally and optically evaluated. The amorphous WO 3.33 films which showed high transparency permit electronic transitions within an indirect allowed energy band gap of 3.05 eV. The band gap comprised energy band tails of width of 190 meV. Four dominant dielectric resonators centered in the infrared (IR), visible (VIS) and ultraviolet (UV) ranges of light are detected. Analysis of the optical conductivity in accordance with the Drude-Lorentz approaches have shown that the drift mobility of free holes in this amorphous layer can be as large as 5.61 cm 2 /Vs an as low as 1.59 cm 2 /Vs when exposed to IR and UV light signals, respectively. In addition, the gigahertz/terahertz cutoff frequency ( ) spectra demonstrated values in the gigahertz frequency domain when exposed to IR light. Excitations with light signals in the VIS and UV spectral ranges allow values that extends from 0.7-40.0 THz. The wide range of tunability of the WO 3 dielectric resonators nominates them as dielectric lenses suitable for optical communications.

show abstract

Synthesize of WO3 thin film supercapacitor and its characterization

Cited by 13 publications

References 18 publications

Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

Enhanced Performance of WO3/SnO2 Nanocomposite Electrodes with Redox-Active Electrolytes for Supercapacitors

Amorphous WO3 thin films designed as gigahertz/terahertz dielectric lenses

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