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Structure and Optical Behavior of Nanocomposite Hybrid Films of Well Monodispersed ZnO Nanoparticles into Poly (vinylpyrrolidone)

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Journal of Materials Science & Technology 2006年第2期22卷 230-234页

作者： Wei FENG Huichun TAO Yan liu yichun liu College of Environmental Science and Engineering Dalian Maritime University Dalian 116026 China Center for Advanced Opto-electronic Functional Material Research Northeast Normal University Changchun 130024 China

We fabricated an inorganic-polymeric photoluminescent thin film based on ZnO nanoparticles, which were grown directly in the poly（vinylpyrrolidone）（PVP） matrix. The microstructure, composition, thermal stability, and the temperature-dependent photoluminescence of the thin film were investigated. X-ray diffraction （XRD） and transmission electron microscopy （TEM） results indicated that all the ZnO nanoparticles with a polycrys talline hexagonal wurzite structure were well separated from each other and were dispersed in the polymeric matrix homogeneously and randomly. Raman spectrum （Raman） showed a typical resonant multi-phonon process within the hybrid thin film. The shifts of infrared bands for PVP in the hybrid film should be attributed to strong coulombic interaction between ZnO and polymeric matrix. The stability of the hybrid film and the effect of the perturbation of ZnO on the stability were determined by means of the thermogravimetric analysis （TG） and differential thermal analysis （DTA）. The ultraviolet-visible adsorption （UV-vis） showed distinct excitonic features. The photoluminescent spectrum （PL） of the ZnO nanoparticles modified by PVP molecules showed markedly enhanced ultraviolet emission and significantly reduced green emission, which was due to the Perfect surface passivation of ZnO nanoparticles. Temperature dependent photoluminescent spectrum studies suggested that the ultraviolet emission was associated with bound exciton recombination.

关键词： Thin film ZnO Poly (vinylpyrrolidone) Photoluminescence

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Progresses in Sustainable Recycling Technology of Spent Lithium-Ion Batteries

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Energy & Environmental Materials 2022年第4期5卷 1012-1036页

作者： Kaidi Du Edison Huixiang Ang Xinglong Wu yichun liu Faculty of Chemistry Northeast Normal UniversityChangchunJilin 130024China MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityChangchunJilin 130024China Natural Sciences and Science Education National Institute of EducationNanyang Technological UniversitySingapore 637616Singapore

The number of lithium-ion batteries(LIBs)is steadily increasing in order to meet the ever-growing demand for sustainable energy and a high quality of life for *** the same time,the resulting large number of LIB waste certainly poses safety hazards if it is not properly disposed of and will seriously harm the environment due to its inherent toxicity due to the use of toxic ***,the consumption of many scarce precious metal resources is behind the mass production of *** the light of severe environmental,resources,safety and recycling problems,recycling spent LIBs have become an essential urgently needed action to achieve sustainable social *** review therefore critically analyses the value and the need for recycling of spent LIBs from a variety of resources and the environment.A range of existing technologies for recycling and reusing spent LIBs,such as pretreatment,pyrometallurgy,hydrometallurgy,and direct recycled methods,is subsequently summarized *** addition,the benefits and problems of the methods described above are analyzed in *** also introduces recycling progress of other LIB components,such as anodes,separators,and electrolytes,as well as the high-value ***,the prospects for recycling LIBs are addressed in four ways(government,users,battery manufacturers,and recyclers).This review should contribute to the development of the recycling of used LIBs,particularly in support of industrialization and recycling processes.

关键词： cathode materials pretreatment recycling spent lithium-ion batteries valuable metals

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Recent progress in ZnO-based heterojunction ultraviolet light-emitting devices

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Chinese Science Bulletin 2014年第12期59卷 1219-1227页

作者： yichun liu Haiyang Xu Chunyang liu Weizhen liu Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University

Wide bandgap(3.37 eV)and high excitonbinding energy of ZnO(60 meV)make it a promising candidate for ultraviolet light-emitting diodes(LEDs)and low-threshold lasing diodes(LDs).However,the difficulty in producing stable and reproducible high-quality p-type ZnO has hindered the development of ZnO p–n homojunction *** alternative strategy for achieving ZnO electroluminescence is to fabricate heterojunction devices by employing other available p-type materials(such as p-GaN)or building new device *** this article,we will briefly review the recent progress in ZnO LEDs/LDs based on p–n heterostructures and metal–insulatorsemiconductor *** methods to improve device efficiency are also introduced in detail,including the introduction of Ag localized surface plasmons and single-crystalline nanowires into ZnO LEDs/LDs.

关键词：紫外发光二极管异质结器件 ZnO 光发射器件表面等离子体激元异质结构氧化锌激光二极管

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Edge-functionalized graphene quantum dots as a thickness-insensitive cathode interlayer for polymer solar cells

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Nano Research 2018年第8期11卷 4293-4301页

作者： Han Xu Lu Zhang Zicheng Ding Junli Hu Jun liu yichun liu Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University) Ministry of Education Changchun 130024China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022 China Han Xu and Lu Zhang contributed equally to this work.

A thickness-insensitive cathode interlayer （CIL） is necessary for large-area polymer solar cells （PSCs）, in which thickness variation is unavoidable. These C1L materials are typically based on n-type conjugated polymer/molecule backbones, which show strong light absorption in the visible/near-infrared （NIR） region. This interferes with the sunlight absorption by the active layer and deteriorates device efficiency. In this study, we developed graphene quantum dots functionalized with ammonium iodide （GQD-NI） at the edge as a thickness-insensitive CIL with high optical transparency. The peripheral ammonium iodide groups of GQD-NI formed the desired interfacial dipole with the cathode to decrease the work function. The graphene basal planes of GQD-NI with a lateral size of ca. 3 nm demonstrated a good conductivity of 3.56 ×10-6 ***-1 and high transparency in the visible/NIR region （λmax abs = 228 nm）. Moreover, GQD-NI was readily soluble in polar organic solvents, e.g., methanol, which enabled multilayer device fabrication with orthogonal solvent processing. As a result, the PSC device with GQD-NI as the CIL exhibited a power conversion efficiency （PCE） of 7.49%, which was much higher than that of the device without the CIL （PCE = 5.38%） or with calcium as the CIL （PCE = 6.72%）. Moreover, the PSC device performance of GQD-NI was insensitive to the GQD-NI layer thickness in the range of 2-22 nm. These results indicate that GQD-NI is a very promising material for application as a CIL in large-area printed PSCs.

关键词： graphene quantum dots ammonium edge-functionalization cathode interlayer polymer solar cells

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Research on Transferable Off-Line Electronic Cash System

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Wuhan University Journal of Natural Sciences 2008年第6期13卷 749-752页

作者： liu yichun Guangdong Key Laboratory of Electronic Commerce/ Guangdong University of Business Studies Guangzhou 510320 Guangdong China

In this paper, a new cash scheme is proposed for electronic payment system, in which the cash can be transferred several times. When this kind of cash is used, the fraud such as double spending can be found out but the bank and the trusted party needs not be involved online in each transaction. This cash system is anonymous in normal transactions. But if a fraud happens, the trusted party can withdraw the anonymity to find out the cheater. The new cash scheme is transferable, anonymous, off-line and efficient.

关键词： electronic cash transferability anonymity

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Tunable bismuth doping/loading endows NaTaO_(3)nanosheet highly selective photothermal reduction of CO_(2)

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Nano Research 2023年第2期16卷 2142-2151页

作者： Mengmeng Zhang Changhua Wang Yueyun Wang Songmei Li Xintong Zhang yichun liu Key Laboratory of Ultraviolet(UV)-Emitting Materials and Technology of Chinese Ministry of Education Northeast Normal UniversityChangchun 130024China

Photothermal CO_(2)reduction with H2O,integrating advantages of photocatalysis driven H2O splitting and thermal catalysis promoted CO_(2)reduction,has drawn sharply increasing attention in artificial synthesis of solar *** photothermal effect of metal nanoparticles facilities CO_(2)hydrogenation and activation of lattice oxygen in oxide photocatalyst promotes H2O oxidation,which is essentially considered for highly efficient photothermal ***,the large thermal conductivity of most metal nanoparticles induces inevitable heat dissipation,restricting the increase of catalyst *** this work,to minimize the heat dissipation,we employ bismuth nanoparticles as photothermal unit,which is of the lowest thermal conductivity in the metal ***,we adopt bismuth doped NaTaO_(3)as photocatalytic unit because of the bismuth doping induced activation of lattice *** bismuth nanoparticles are assembled with bismuth doped NaTaO_(3)through one-step tunable transformation from *** from the photothermal effect,thermal insulation caused by bismuth metal,and lattice oxygen activation by bismuth doping,the NaTaO_(3):Bi hybrid exhibits high photothermal catalytic *** yield of CO over NaTaO_(3):Bi hybrid at 413 K via photothermal catalysis is 141 times higher than that room temperature ***,ultraviolet(UV)light irradiation leads to 89.2%selectivity of CO and visible light irradiation leads to 97.5%selectivity of *** work may broaden the photocatalytic application of ABO_(3)perovskite and provides a novel strategy for the development of photothermal catalysts for artificial photosynthesis.

关键词： CO_(2)reduction photothermal catalytic NaTaO_(3) bismuth high selectivity

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MXenes for perovskite solar cells:Progress and prospects

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Journal of Energy Chemistry 2023年第6期81卷 443-461,I0010页

作者： Lin Yang Peng Li Jiangang Ma Xintong Zhang Xiao-Feng Wang yichun liu Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024JilinChina Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012JilinChina

Perovskite solar cells(PSCs)have been developed over the past decade as the forefront of the state-of-theart photovoltaic technologies owing to their high efficiency and low cost,where nanostructured functional materials play key roles in performance *** a versatile class of two-dimensional(2D)materials,transition metal carbides/nitrides MXenes have gained enormous attentions in PSCs since 2018 due to their superior properties such as excellent metallic conductivity,abundant surface functional groups,tunable work functions,high optical transparency,and mechanical *** explorations of MXenes are of significance in performance promotion and commercialization expansion of *** such,this review focuses on the diversified advantages of MXenes,comprehensively summarizing their applications and developments in PSCs as additives,electron/hole transporting layers,interfacial engineering layers,and electrodes in sequence and explaining the relevant mechanisms ***,the problems emerged from the related studies are considered and the corresponding suggestions like opening up the type of MXenes usage,taking further insight of the modulation of surface termination groups on Fermi levels,understanding the effect on energy level structures of perovskite or other functional layers,and realizing commercialization,*** provided for the future in-depth *** review is intended to provide overall perspective of the current status of MXenes and highlight the direction for the future advancements in MXenes design and processes towards efficient,stable,large-area,and low-cost PSCs.

关键词： MXenes Two-dimensional materials Perovskite solar cells Photovoltaic technologies Environment

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Advances in memristor based artificial neuron fabrication-materials,models,and applications

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International Journal of Extreme Manufacturing 2024年第1期6卷 27-50页

作者： Jingyao Bian Zhiyong liu Ye Tao Zhongqiang Wang Xiaoning Zhao Ya Lin Haiyang Xu yichun liu Key Laboratory for UV Light-Emitting Materials and Technology(Northeast Normal University) Ministry of Education5268 Renmin StreetChangchunPeople’s Republic of China

Spiking neural network(SNN),widely known as the third-generation neural network,has been frequently investigated due to its excellent spatiotemporal information processing capability,high biological plausibility,and low energy consumption *** to the working mechanism of human brain,the SNN system transmits information through the spiking action of ***,artificial neurons are critical building blocks for constructing SNN in *** are drawing growing attention due to low consumption,high speed,and nonlinearity characteristics,which are recently introduced to mimic the functions of biological *** have proposed multifarious memristive materials including organic materials,inorganic materials,or even two-dimensional *** advantage of the unique electrical behavior of these materials,several neuron models are successfully implemented,such as Hodgkin–Huxley model,leaky integrate-and-fire model and integrate-and-fire *** this review,the recent reports of artificial neurons based on memristive devices are *** addition,we highlight the models and applications through combining artificial neuronal devices with sensors or other electronic ***,the future challenges and outlooks of memristor-based artificial neurons are discussed,and the development of hardware implementation of brain-like intelligence system based on SNN is also prospected.

关键词： artificial neuron memristor memristive materials neuron model micro-nano manufacturing spiking neural network

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Memristors with organic-inorganic halide perovskites

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InfoMat 2019年第2期1卷 183-210页

作者： Xiaoning Zhao Haiyang Xu Zhongqiang Wang Ya Lin yichun liu Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchunChina

Organic-inorganic halide perovskites(OHPs)have been intensively studied for application in solar cells with high conversion efficiency exceeding 22%.The unique electrical and optical properties of OHPs have led to their use in optoelectronic device applications beyond photovoltaics,such as light-emitting diodes,photodetectors,*** information storage technologies and computing architectures are being researched extensively with the aim of addressing the growing challenge of approaching end of Moore's law and von Neumann *** the fourth basic circuit element,memristor is a leading candidate with powerful capabilities in information storage and neuromorphic computing ***,OHPs have received growing attention as promising materials for *** particular,their mixed ionic-electronic conduction ability paired with light sensitivity provide OHPs with the opportunity to display novel functions such as optical-erase memory,optogenetics-inspired synaptic functions,and lightaccelerated learning *** review covers recent advances in OHP-based memristors development including memristive mechanism and analytical models,universal memristive characteristics for memory and neuromorphic computing applications,and novel *** and future prospects of OHP-based memristors are also discussed.

关键词： memristors neuromorphic computing nonvolatile memory organic-inorganic halide perovskites resistive switching

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Inter-Provincial Transaction Model in Two-Level ElectricityMarket Considering Carbon Emission and Consumption Responsibility Weights

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Energy Engineering 2023年第10期120卷 2393-2416页

作者： Chunlei Jiao HongyanHao Ming Li Rifucairen Fu yichun liu Shunfu Lin Ronghui liu Electric New Power System Technology Research Institute The Electric Power Research Institute of State Grid Xinjiang Electric Power Co.Ltd.Urumqi830000China Power Dispatch Control Center State Grid Xinjiang Electric Power Co.Ltd.Urumqi830063China College of Electrical Engineering Shanghai University of Electric PowerShanghai200090China

In the context of the joint operation of China’s intra-provincial markets and inter-provincial trading,how to meet the load demand and energy consumption using inter-provincial renewable energy trading is a key *** combined operation of intra-provincial and inter-provincial markets provides a new way for provincial power companies to optimize and clear the intra-provincial power market,complete the intra-provincial consumption responsibility weight index,and consume renewable energy across provinces and *** paper combines power generation and consumption within the province,uses inter-provincial renewable energy trading tomeet the load demand within the province and completes the index of intra-provincial consumption responsibility *** intra-provincial market trading and inter-provincial market clearing are respectively taken as the upper and lower levels of the *** the two-level electricity market operation framework,the upper-level model aims to minimize the expected total operating cost within the province considering the carbon emission cost and the weight of the consumption responsibility,while the lower-level model aims to minimize the inter-provincial renewable energy purchasing ***,the influence of inter-provincial transaction mechanism,risk aversion coefficient,voucher price,and responsibility weight on operating cost is *** is used to verify that the proposed model can meet the requirements of the provincial load power consumption and the consumption responsibility weight index,and promote the consumption of renewable energy.

关键词： Consumption responsibility weights electricity market carbon emission transactions between provinces

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