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A rational preparation strategy of phase tuned MoO_(3) nanostructures for high-performance all-solid asymmetric supercapacitor

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Journal of Energy Chemistry 2023年第12期87卷 192-206,I0006页

作者： M.Kundu D.Mondal I.Mondal A.Baral P.Halder s.Biswas B.K.Paul N.Bose R.Basu s.das Department of Physics Jadavpur UniversityKolkata 700032India Department of Physics Jogamaya Devi CollegeKolkata 700026India Rescon India Pvt.Ltd Kolkata 700034India school of Advanced Materials Green Energy and Sensor Systems(SAMGESS)IIESTShibpurHowrah 711103India Bangabasi College Kolkata 700009India University of Engineering and Management Kolkata 700160India

In this work,phase and morphology-tuned MoO_(3) nanostructures are synthesized through a novel modified co-precipitation method,and their electrochemical properties are *** the first time,such a simple surfactant-assisted synthesis process aided by minor temperature variations is reported which results in phase transition of the nanoparticles from h-MoO_(3) nano-rods to a-MoO_(3) *** nanostructures thus developed are highly porous and crystalline with significantly large specific surface area as compared to previous *** theoretical bandgap energy of the optimized sample calculated using Perdew-Zunger local density approximation(LDA) is in good agreement with the experimental *** overall structural,morphological,and surface-behavioural analysis predicts the electrochemical superiority in 2D a-MoO_(3).The cyclic voltammetry and galvano-potentiometry measurements of 2D a-MoO_(3) in the potential window of-0.6 V to +0.2 V present the highest pseudosupercapacitive response with a maximum specific capacitance of 829 F g^(-1)at 2 A g^(-1)as compared to h-MoO_(3) (452 F g^(-1)) and h@a-MoO_(3) (783 F g^(-1)).Thus,the MoO_(3) 2D nanostructures synthesized through our novel synthesis technique display excellent specific capacitance as compared to previous reported ***,a-MoO_(3) exhibits a galvanostatic charging-discharging cyclic stability of about 91%after 2000 cycles,indicating that it can serve as an excellent electrode material for supercapacitors.A solid-state asymmetric supercapacitor device is successfully constructed using a-MoO_(3) which can light up 4 red LEDs for 10 *** specific energy density of the device reaches a maximum value of 36.3 W h kg^(-1)at the power density of 50 W kg^(-1).

关键词： MoO_(3)nanoparticles Asymmetric solid-state supercapacitor Electrochemical performance Low-temperature novel synthesis technique Density functional calculations

Effect of extrusion on properties of Al-based composite

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Transactions of Nonferrous Metals society of China 2010年第12期20卷 2229-2233页

作者： R.dasGUPTA s.das s.CHATURVEDI A.K.JHA Advanced Materials and Processes Research Institute CSIR Bhopal 462064Madhya PradeshIndia

An aluminium alloy and its composite with dispersed siC particles made by liquid metallurgy route were extruded under optimized *** properties were characterized in terms of microstructure,hardness and sliding wear behaviour and then compared between the extruded and cast alloys and composites,in order to understand the benefits of composite and extrusion on the *** was observed that composites drastically increased the hardness and the extruded composites further increased this *** advantage of composites was realized in sliding wear tests.

关键词： Al基复合材料挤压 siC颗粒优化条件磨损行为铸造合金磨损试验铝合金

Characterization of electrical properties of AlGaN/GaN interface using coupled schrodinger and Poisson equation

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Journal of semiconductors 2012年第11期33卷 16-23页

作者： s.das A.K.Panda G.N.dash National Institute of science and Technology Palur HillsBerhampurOdisha761008India

The electrical characterization of AlGaN/GaN interface is *** dependence of two-dimensional electron gas（2-DEG） density at the interface on the Al mole fraction and thickness of AIGaN layer as well as on the thickness of GaN cap layer is *** information can be used to design and fabricate AlGaN/GaN based MODFET（modulation doped field effect transistor） for optimum DC and RF characteristics.

关键词： MODFET 2-DEG polarization critical thickness self-heating

Entropy analysis of unsteady magneto-nanofluid flow past accelerating stretching sheet with convective boundary condition

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Applied Mathematics and Mechanics(English Edition) 2015年第12期36卷 1593-1610页

作者： s.das s.CHAKRABORTY R.N.JANA O.D.MAKINDE Department of Mathematics University of Gour Banga Department of Applied Mathematics Vidyasagar University Faculty of Military science Stellenbosch University

The unsteady laminar magnetohydrodynamics （MHD） boundary layer flow and heat transfer of nanofluids over an accelerating convectively heated stretching sheet are numerically studied in the presence of a transverse magnetic field with heat source/sink The unsteady governing equations are solved by a shooting method with the Runge-Kutta- Fehlberg scheme. Three different types of water based nanofluids, containing copper, aluminium oxide, and titanium dioxide, are taken into consideration. The effects of the pertinent parameters on the fluid velocity, the temperature, the entropy generation num- ber, the Bejan number, the shear stress, and the heat transfer rate at the sheet surface are graphically and quantitatively discussed in detail. A comparison of the entropy generation due to the heat transfer and the fluid friction is made with the help of the Bejan number. It is observed that the presence of the metallic nanoparticles creates more entropy in the nanofluid flow than in the regular fluid flow.

关键词： unsteady MHD flow nanofluid heat source/sink entropy generation Bejan number

A comparative corrosion behavior of Mg,AZ31 and AZ91 alloys in 3.5%NaCl solution

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Journal of Magnesium and Alloys 2015年第2期3卷 142-148页

作者： I.B.singh M.singh s.das CsIR-Advanced Materials and Processes Research Institute Bhopal 462026M.P.India

The corrosion behavior of Mg,AZ31 and AZ91 has been evaluated in 3.5%NaCl solution using weight loss,electrochemical polarization and impedance *** rate derived from the weight losses demonstrated the occurrence of steeply fast corrosion reaction on AZ91 alloy after three hours of immersion,indicating the start of galvanic *** increase of corrosion rate with immersion time was also observed for AZ31 but with lesser extent than AZ91 *** Mg metals showed a decrease of corrosion rate with immersion time,suggesting the formation of a protective layer on their *** contrast,the corrosion current density(I_(corr))derived from the Tafel plots,exhibited their corrosion resistances in order of Mg>AZ91>*** charge transfer resistance(R_(ct))and double layer capacitance measured by electrochemical impedance spectroscopy(EIs),are well in accordance with the measured I_(corr).EIs measurements with time and microstructural examination of the corroded and uncorroded samples are helpful in elucidation of results measured by electrochemical polarization.

关键词： Mg and alloys Weight loss Electrochemical measurements sEM

Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser

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Chinese Physics Letters 2016年第5期33卷 39-42页

作者： A.A.Latiff A.Dhar s.W.Harun I.M.Babar s.das M.C.Paul H.Ahmad Photonics Research Center University of Malaya Faculty of Electronics & Computer Engineering Universiti Teknikal Malaysia Melaka CsIR-Central Glass and Ceramic Research Institute Department of Electrical Engineering University of Malaya

We present an all-fiber dual-wavelength holmium-doped veloped holmium-doped fiber （HDF） as a gain medium fiber laser operating in 2 #m region using a newly de- The proposed fiber laser is constructed by using a hybrid gain medium, i.e., a thulium ytterbium co-doped fiber （TYDF） and an HDF in conjunction with a simple half-opened linear cavity, which is formed by a broadband mirror and an output coupler reflector. Without the HDF, the TYDF laser operates at wavelengths of 1991 and 1999nm with a signal-to-noise ratio of more than 34dB and the slope efficiency of 26.16 %. With the HDF, dual-wavelength output lines are obtained at 2075 and 2083nm with signal-to-noise ratios of more than difference between the two peaks of less than 1 dB at 17dB, 3dB bandwidth of less than 0.2nm and the power the TYDF laser pump power of 320roW.

关键词： by in is as nm of Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser HDF

Experimental Observation of Bright and Dark solitons Mode-Locked with Zirconia-Based Erbium-Doped Fiber Laser

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Chinese Physics Letters 2018年第2期35卷 25-28页

作者： A.M.Markom s.J.Tan H.Haris M.C.Paul A.Dhar s.das s.W.Harun Faculty of Electrical Engineering Universiti Teknologi MARAMasai 81750Malaysia school of Engineering KDU University CollegeUtropolis GlenmarieShah Alam 40150Malaysia Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research InstituteKolkata 700032India

We demonstrate the generation of dark and bright solitons with our homemade zirconia-based erbium-doped fiber and graphene oxide（GO） saturable absorber in anomalous dispersion *** GO is fabricated using an abridged Hummer＇s method,which is combined with polyethylene oxide to produce a composite *** film is sandwiched between two optical ferrules and embedded in the laser cavity to enhance its birefringence and *** self-starting bright soliton is easily generated at pump power of 78 mW with the whole length cavity of 14.7 *** laser produces the bright pulse train with repetition rate,pulse width,pulse energy and central wavelength being 13.9 MHz,0.6 ps,2.74 p J and 1577.46 nm,***,by adding the 10 m of single mode fiber into the laser cavity,dark soliton pulse is *** the formation of dark pulse train,the measured repetition rate,pulse width,pulse energy and central wavelength are 8.3 MHz,20 ns and 4.98 p J and1596.82 nm,*** pulses operate in the anomalous region.

关键词： Zr EDF Experimental Observation of Bright and Dark solitons Mode-Locked with Zirconia-Based Erbium-Doped Fiber Laser

添加Al-TiB中间合金对铝合金组织、磨损和压缩变形行为的影响(英文)

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Transactions of Nonferrous Metals society of China 2012年第5期22卷 1001-1011页

作者： D.P.MONDAL Nidhi JHA Anshul BADKUL s.das Advanced Materials and Processes Research Institute(CsIR LAB) Bhopal 462064India

在7178铝合金中添加不同比例的Al-10%TiB中间合金,考察TiB对铝合金的晶粒细化、磨损和压缩变形行为的影响。组织观察表明,TiB颗粒起着晶粒细化剂的作用,导致生成球状枝晶。当Al-TiB中间合金的添加量超过20%时,合金的耐磨性和强度随着中... 详细信息

在7178铝合金中添加不同比例的Al-10%TiB中间合金,考察TiB对铝合金的晶粒细化、磨损和压缩变形行为的影响。组织观察表明,TiB颗粒起着晶粒细化剂的作用,导致生成球状枝晶。当Al-TiB中间合金的添加量超过20%时,合金的耐磨性和强度随着中间合金添加量的增加而降低,即使其枝晶组织变得更细而接近于球状组织。

关键词：铝合金晶粒细化 Al-TiB中间合金压缩变形滑动磨损

对铝硅合金-石墨颗粒复合材料基体显微组织的某些观察

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兵器材料科学与工程 1989年第5期12卷 70-72页

作者： s.das 胡岗

为了使材料获得任一单独组成相常无法达到的综合特性,现在人们对一系列铝合金基复合材料制备技术的兴趣已越来越大。这些复合材料依其第二相的几何形态可大致分为两类。在以纤维和晶须增强的复合材料中,第二相的纵横比范围为100～10000... 详细信息

为了使材料获得任一单独组成相常无法达到的综合特性,现在人们对一系列铝合金基复合材料制备技术的兴趣已越来越大。这些复合材料依其第二相的几何形态可大致分为两类。在以纤维和晶须增强的复合材料中,第二相的纵横比范围为100～10000,而许多以碳、硼、siC和Al_2O_3^-纤维增强的复合材料做为特殊的高强度和高弹性模量结构件应用现已在进行大量工业生产。第二类复合材料则含有弥散的固体润滑物或坚硬陶瓷粒子,它们被广泛应用于各种摩擦领域。当纤维。

关键词：铝硅合金石墨复合材料铝合金