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RISS 인기검색어
- 검색키워드
- 저자 : Vaibhav C. Lokhande (검색결과 4 건)
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윤대한,Vaibhav. C. Lokhande,지택수 대한전자공학회 2023 전자공학회논문지 Vol.60 No.5
This study examines the electrode material of a supercapacitor using a transition metal oxide as pseudo-capacitors. Precursors of tungsten (W), niobium (Nb), molybdenum (Mo) and iron(Fe) were mixed to synthesize them using hydrothermal synthesis method, and electrochemical properties were analyzed by depositing them on carbon cloth. In a 1M H2SO4 electrolyte, specific capacity was calculated by evaluating electrochemical characteristics through cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). In addition, properties of sample materials were analyzed through X-ray diffraction analysis (XRD) and X-ray spectroscopy (XPS), and through Field emission scanning electron microscope (FE-SEM) images. As a result of the analysis, Fe did not participate in the binding, and it was found that WO3, Nb2O5, and MoO3 accounted for 18.32%, 6.94%, and 74.74% respectively, through XRF analysis. The specific capacitance was calculated through GCD and it showed a good value 375A/g in 1A/g of current density. 본 논문에서는 유사커패시터 중에서 전이금속 산화물을 이용한 슈퍼커패시터의 전극 물질을 합성하고 전기화학적 분석을 통해 그 특성을 연구하였다. 텅스텐(W)과 나이오븀(Nb), 몰리브덴(Mo)과 철(Fe)의 전구체들을 혼합하여 수열합성법(Hydrothermal Synthesis)을 이용하여 합성하였고 탄소 섬유(Carbon cloth)에 증착시켜 전기화학적 특성을 분석하였다. 1M H2SO4 전해질에서 순환전압전류법(CV, Cyclic voltametry)과 정전류 충방전법(GCD, Galvanostatic charge-discharge)을 통하여 전기화학적 특성 평가를 하여 비축전량(Specific capacitance)을 계산하였으며, X-ray 회절분석(XRD), X-ray 분광분석(XPS) 및 전기주사현미경(FE-SEM) 이미지를 통하여 각 물질의 특성을 분석하였다. 분석결과 4가지 원소 중 Fe는 결합에 참여하지 않았다는 것을 알 수 있었고 X-ray 형광분석(XRF)을 통해, 합성된 시료물질은 WO3, Nb2O5, MoO3가 각각 18.32%, 6.94%, 74.74%를 차지하고 있다는 것을 알 수 있었다. GCD를 통해 계산한 비축전량은 1A/g에서 375A/g으로 양호한 값을 나타내었다.
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Shital Bachankar,Vaibhav C. Lokhande,Kim Chihoon,Jaehyung Park,Jin-Young Park,Taeksoo Ji 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
This study explores the synthesis of Nickel Oxide (NiO) / Graphene Oxide (GO) composite via a single-step hydrothermal method for its potential application as a supercapacitor electrode material. The synthesized NiO/GO was thoroughly characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. XRD analysis confirmed the formation of pure-phase NiO, while SEM revealed the uniform porous morphology of NiO/GO particles with a spherical structure. The electrochemical analysis demonstrated the remarkable areal capacitance of 215.6 F cm⁻² at a current density of 1 mA cm⁻², indicating the promising electrochemical performance of NiO/GO for supercapacitor applications.
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Aditi A. Kumbhar,Kim Chihoon,Vaibhav C. Lokhande,Seung-Ho Ohk,Taeksoo jia 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
Orthorhombic MoO₃ was synthesized by a simple, low cost and scalable hydrothermal method. With acidification of (NH₄)₂MoO₄) ammonium molybdate. The structural and morphological characteristics were carried out by using X-ray diffraction (XRD), field emission microscopy (FESEM), and Fourier transform infrared (FTIR) respectively. Nanoblades like morphology was observed by FESEM images at different magnifications. The electrochemical properties of the material were carried out in 1M H₂SO₄ as an electrolyte. The MoO₃ ensures good cyclic voltammetry behavior with a maximum specific capacitance of 22.85 Fg<SUP>-1</SUP> at 5 mVs<SUP>-1</SUP>. The energy density and power density of 5.55 Whkg<SUP>-1</SUP> and 17.85 Wkg<SUP>-1</SUP> respectively are calculated from the GCD study. An electrochemical impedance study was also conducted in 1M H₂SO₄ electrolyte.
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