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中国科学:技术科学（英文版）
中国科学:技术科学（英文版）

周光召

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中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Free-standing β-Ta2O5/SWCNTs composite film for high-rate Li-ion storage

    WU ZhiMinLIU JiaJiaHE XingYuBIAN Jing...
    616-626页
    查看更多>>摘要：The rapid development of portable and wearable electronic devices is responding to the urgent demand for high-efficiency flexible energy storage devices.Flexible supercapacitors,showing long cycle life,high power density,and good safety,are considered ideal candidates.Nevertheless,the relatively low energy density restricts their practical applications.With a large dielectric constant of 18-46,Ta2O5-based materials typically exhibit excellent electron-binding ability,which is critical for enhancing the energy density of supercapacitors.In this work,the free-standing β-Ta2O5/single-walled carbon nanotubes(SWCNTs)composite film was prepared,with a high β-Ta2O5 loading of over 70％.By anchoring β-Ta2O5 nanoparticles onto the surface of SWCNTs,the system's flexibility and conductivity were significantly enhanced,which also facilitated the inter-calation electrodynamics of metal cations.As a result,the flexible β-Ta2O5/SWCNTs film exhibits excellent Li-ion storage performance,with a high volumetric specific capacitance of 392.3 F cm-3 at the scan rate of 10 mV s-1 and 198.9 F cm-3 at 500 mV s-1.In addition,the asymmetric device,assembled by the β-Ta2O5/SWCNTs and activated carbon films,shows a high energy density of 45.5 Wh kg 1 at the power density of 10.8 kW kg-1.This technique opens up a new avenue for improving the energy density and rate performance of flexible supercapacitors.
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    Numerical study on waste polyethylene pyrolysis driven by self-sustaining smoldering

    PAN RuMingWU YiBoGUENE LOUGOU BachirouSHUAI Yong...
    627-638页
    查看更多>>摘要：Polyethylene is the type of waste plastic that accounts for the most significant proportion of municipal solid waste.Waste polyethylene can be valorized via pyrolysis and produce value-added oil,gas,and char.On the other hand,self-sustaining smoldering is an emerging technical means to deal with sand/soil contaminated by organic matter.The high-temperature heat generated by smoldering can be used as a heat source for pyrolyzing waste polyethylene.Therefore,this study investigates numerically the pyrolysis of waste polyethylene driven by self-sustaining smoldering.A novel 4-step lumped kinetic model is proposed for simulating the pyrolysis of waste polyethylene.The results indicate that the operating parameters can determine the pyrolysis product yields by regulating the pyrolysis temperature and the volatile residence time.Note that higher temperatures and longer residence times favor the generation of shorter-chain pyrolysis products because of the intensified volatiles'sec-ondary cracking.It can be concluded that a high interface-wall heat transfer coefficient(400 W m-2 K-1),a low PE content(0.20),a high char concentration(2.4％),and a moderate air velocity(0.040 m s-1)are beneficial to oil yield.To some extent,this study may broaden the boundaries for the application of self-sustained smoldering-driven pyrolysis.
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    • 维普

    Highly efficient tunable photodetector with a bipolar response in van der Waals heterojunctions

    SHI ChaoFanZHANG ShiXIAO KeNingZHANG LiBo...
    639-646页
    查看更多>>摘要：The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic performance of photodetectors,due to an assortment of distinctive light-matter interactions.Nonetheless,vdW heterojunction photodetectors based on transition metal dichalcogenides(TMDs)face an inevitable trade-off between low dark currents and high responsivity,curtailing the application potential of myriad novel optoelectronic components in sensing,spectral,and communication systems.In this study,we present the successful actualization of a highly sensitive,self-powered,and gate-tunable bipolar response photodetector.The mechanisms underlying photocurrent generation were scrutinized via bias-,power-,and position-dependent mapping photo-response measurements,identifying the photovoltaic effect,which is attributable to the Schottky junction's built-in electric field,as the predominant mechanism.The prototype Au-WS2-graphene photodetector exhibits a remarkable light on/off ratio of 1.2 x 106,a specific detectivity of 6.12 × 1011 cmHz1/2W 1 with 20 μs response time at 638 nm.The wide gate-tunable responsivity provides an adjustability scope,ranging from 0.9 to 3.1 A W 1.Notably,the device demonstrates an exceptional linear photocurrent response,with a linear dynamic range(LDR)value approximating 130 dB,which significantly surpasses that of other photodetectors based on TMDs.
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    • 万方数据
    • 维普