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Highly efficient energy harvest via external rotating magnetic field for oil based nanofluid direct absorption solar collector

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Green Energy & Environment 2021年第2期6卷 298-307页

作者： Debing Wang Wenwen Liang Zhiheng Zheng Peiyu Jia Yunrui Yan Huaqing Xie Lingling Wang Wei Yu school of emvironmental and mate rials engineering College of Engineering Shanghai Polytechnic UniversityShanghai201209China Research Center of Resource Recycling Science and engineering Shanghai Polytechnic University Shanghai201209China Shanghai Key Laboratory of engineering mate rials Application and Evaluation Collge of EngineeringShanghai Polyteclmic UniversityShanghai201209China

Nanofluids based direct absorption solar collectors(DASCs) are considered as the important alternative for further improve the utilization of solar energy. However the low-quality energy and aggregation of nanoparticles obstructs their large-scale application. In this work, a new method of using magnetic nanofluids in DASCs is proposed. By this method, not only high-quality energy is got as well as the problems of blockage and corrosion in heat exchanger are well avoided. The result shows that the maximum temperature can reach 98℃ under 3 solar irradiations and the photothermal conversion efficiency can be further increased by 12.8% when the concentration is 500 ppm after adding an external rotating magnetic field. The highest viscosity of working fluid reduced by 21% when the concentration is 500 ppm at 95℃ after separating the Fe_(3)O_(4)@C nanoparticles from the nanofluids via magnetic separation technology. Meanwhile, the obtained pure base liquids with high temperature flow to heat exchanger, which also reduces the flow resistance in pipeline and avoids the problems such as blockage and corrosion in heat exchanger. This research promotes a new way for the efficient utilization of solar energy.

关键词： Direct absorption solar collector Magnetic Fe_(3)O_(4)@C-oil nanofluids Magnetic separation technology High-quality energy

Applications of flexible electrochemical electrodes in wastewater treatment:A review

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Chinese Chemical Letters 2024年第8期35卷 84-92页

作者： Jiqing Liu Qi Dang Liting Wang Dejin Wang Liang Tang Key Laboratory of Organic Compound Pollution Control engineering(MOE) School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China school of Resources and Environment Anqing Normal UniversityAnqing 246011China

The advancement of energy storage technology has paved the way for the application of electrochemi-cal processes in achieving low-carbon and precise environmental pollution *** play a crucial role in efficiently removing organic pollutants and heavy *** implement electrochemical pollution control technology in practical engineering,flexible electrode preparation is *** review highlights recent progress in flexible electrode research,focusing on the selection and structural design of flexible electrode *** summarizes the latest advancements in current collectors,active mate-rials,and preparation methods to enhance conductivity,flexibility,and cycle *** application of flexible electrodes in water pollution control is categorized into three aspects:Organic pollutants,inor-ganic pollutants,and composite ***,the challenges and research requirements for enhanc-ing electrode flexibility in environmental governance are discussed,along with prospects for their future applications.

关键词： Flexible electrode Wastewater treatment Photoanode Removal effect Emerging contaminants

Synthesis and luminescent properties of lanthanide-doped ScVO_4 microcrystals

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Journal of Rare Earths 2017年第1期35卷 28-33页

作者： XU Shuilin XIE Xiaoji ZHAO Baozhou NIE Li PAN Yue SU Haiquan HUANG Ling HUANG Wei Key Laboratory of Flexible Electronics （KLOFE） Institute of Advanced materials （IAM） Jiangsu National Synergetic Innovation Center for Advanced Mate- rials （S1CAM） Nanjing Tech University （NanjingTech） Nanjing 211816 China school of Chemistry and Chemical engineering Inner Mongolia University Hohhot 010022 China

High quality and monodispersed ScVO4 microcrystals were successfully synthesized via a mild hydrothermal route using NH4VO3 as vanadium source. The X-ray power diffraction（XRD） and field-emission scanning electron microscopy（FE-SEM） results indicated that the size, shape, and phase formation of the ScVO4 microcrystals could be tuned by altering the reaction temperature, reaction time, and p H value of the initial solution. Furthermore, the down- and upconversion luminescence of ScVO4：Ln（Ln=Eu, Dy, Sm, Yb/Ho, Yb/Er, and Yb/Tm） microcrystals were characterized and the respective energy transfer processes were also discussed. The experimental results demonstrated that reactions at 200 oC, 24 h, and pH=6 could generate perfect ScVO4 microcrystals, which were then used for luminescence studies.

关键词： ScVO4 hydrothermal synthesis down/upconversion luminescence rare earths

Fe nanoclusters anchored in biomass waste-derived porous carbon nanosheets for high-performance supercapacitor

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Chinese Chemical Letters 2024年第8期35卷 362-366页

作者： Yuchen Wang Yaoyu Liu Xiongfei Huang Guanjie He Kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Advanced Energy materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUnited Kingdom

Metal-nanocluster materials have gradually become a promising electrode candidate for supercapaci-tor *** high-efficient and rational architecture of these metal-nanocluster electrode mate-rials with satisfied supercapacitive performance are full of ***,Fe-nanocluster anchored porous carbon(FAPC)nanosheets were constructed through a facile and low-cost impregnation-activation *** characterization methods documented that FAPC nanosheets possessed a mesopore-dominated structure with large surface area and abundant Fe-N4 active sites,which are crucial for su-percapacitive energy *** optimal FAPC electrode exhibited a high specific capacitance of 378 F/g at a specific current of 1 A/g and an excellent rate capability(271 F/g at 10 A/g),which are comparable or even superior to that of most reported carbon ***,the FAPC-based device achieved a desired specific energy of 14.8 Wh/kg at a specific power of 700 W/*** work opens a new avenue to design metal-nanocluster materials for high-performance biomass waste-based supercapacitors.

关键词： Fe nanoclusters Biomass waste Porous carbon nanosheets Supercapacitor Charge transfer

The Preparation of Porous Activated Slag Granules/TiO_(2)Photocatalyst and Its De-NO_(x)Performance

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Journal of Wuhan University of Technology(materials Science) 2021年第3期36卷 347-352页

作者： ZHU Lide CHEN Jing SI Heyang FANG Yongle WANG Xinyu WANG Zongsen YANG Lu State Key Laboratory of Silicate materials for Architectures Wuhan University of TechnologyWuhan 430070China school of mate-rials Science and engineering Wuhan University of TechnologyWuhan 430070China Technical Supervision and Research Center of the Building materials Industry Beijing 100024China Institute of Technical Information for Building materials Industry Beijing 100024China Anhui Masteel K.WAH New Building materials CO.LTD. Maanshan 243099China

The porous structure and honeycombed structure of granulated blast furnace slag formed by alkali activation(AGBFS)can be used as a promising photocatalysts substrate for the photocatalytic removal of atmospheric or water *** this study,photocatalytic activated slag granules were synthesized by loading TiO_(2)on AGBFS with immersion *** physicochemical properties and NO_(x)removal performance of activated slag granules/TiO_(2)photocatalysts were studied by X-ray diffraction(XRD),scanning electron microscope(SEM)and photocatalytic performance *** effects of slag particle sizes and nano-TiO_(2)loading concentrations on photocatalytic efficiencies of NO_(x)removal were also *** was found that the De-NO_(x)performance of activated slag granules/TiO_(2)photocatalyst increased with the increasing of slag particle size in low TiO_(2)loading concentration situation,while increasing the TiO_(2)loading concentration would result in the opposite De-NO_(x)performance as slag size ***,for the same size activated slag,the photocatalytic efficiency of activated slag granules/TiO_(2)photocatalyst gradually improved with the increase of loading concentration of TiO_(2).

关键词： granulated blast furnace slag porous structure alkali-activation photocatalysis NO_(x)

Exploring one material for dual applications:A red-emitting Mg2GeO4:Eu3+ nanophosphor for future generation energy efficient WLEDs and dosimetric applications

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Journal of Rare Earths 2024年第10期42卷 1835-1845页

作者： Akshay Arjun G.P.Darshan S.C.Sharma H.Nagabhushana D.V.Sunitha H.B.Premkumar Department of Physics Faculty of Mathematical and Physical SciencesM.S.Ramaiah University of Applied Sciences Jain University C.N.R.Rao Centre for Advanced materials Tumkur University school of Applied Sciences (Physics) REVA University

The envisaged design and developme nt of individual mate rials to excavate a broader spectrum of desired properties and offer multiple applications are highly *** this in mind,a series of forsterite-structured Mg2GeO4:Eu3+（1 mol%-9 mol%） nanophosphors was synthesized via a solution combustion method using oxalyl dihydrazide as a *** X-ray diffraction patterns confirm the orthorhombic crystal system with a Puma space *** results clearly show irregularly shaped cluster-like structures with aggregation of the *** diffuse reflectance spectra,the optical energy band gap of the Mg2GeO4:Eu3+（1 mol%-9 mol%） nanophosphors was estimated and obtained to be～4.12-4.32 *** photoluminescence emission spectra exhibit intense peaks at ～579,589,610,661,and 707 nm,which are due to characteristic5D0→7F0,5D0→7F1,5Do→7F2,5D0→7F3and5D0→7F4transitions of Eu3+ions,*** Commission International de L'Eclairage color coordinates are gradually tuned from pale red（0.5980,0.4012） to a pure red（0.6385,0.3611） *** glow peaks showcase excellent super-linear response at low doses of γ-irradiations,indicating that the prepared phosphor can be used in thermoluminescent personal dosimetry which is a biological tissue *** aforementioned results demonstrate that the prepared Mg2GeO4:Eu3+（1 mol%-9 mol%） nanophosphors are considered an excellent candidate for dual applications,i.e.,red component in future generation white-light-emitting diodes（WLEDs） and personal dosimetric applications.

关键词： Dosimetry Nanophosphors Photoluminescence Photometric properties Rare earths Thermoluminescence

Recent advance in electromagnetic shielding of MXenes

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Chinese Chemical Letters 2021年第2期32卷 620-634页

作者： Yanqing Yao Jia Zhao Xuanhe Yang Chunpeng Chai school of materials Science and engineering Beijing Institute of TechnologyBeijing 100081China

As a new type of two-dimensional material,MXene’s unique layered structure,outstanding electrical conductivity,low density,tunable surface chemistry,and solution processability make it receive extensive attention in various fields,especially for the lightweight shielding mate rials since the report on electromagnetic interference(EMI) shielding of 2D Ti3 C2 Tx in *** this review,the progress on the MXe nes material including their synthetic strategies,prope rties and EMI application is ***,the recent advance on the different synthesis methods and properties of MXene is *** to their intrinsic characteristics,the application of MXene in EMI fields is then ***,the challenges and perspective on the future development of MXene in low-cost preparation and practical application are proposed.

关键词： Mxene Transition metal carbides/nitrides/carbonitrides Synthesis and property Composite material Electromagnetic interference shielding

Strain engineering of two-dimensional materials:Methods,properties,and applications

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InfoMat 2021年第4期3卷 397-420页

作者： Shengxue Yang Yujia Chen Chengbao Jiang school of materials Science and engineering Beihang UniversityBeijingChina

Two dimensional(2D)materials have attracted extensive research interests due to their excellent properties related to unique *** engineering,as an important strategy for tuning the lattice and electronic structure of 2D mate-rials,has been widely used in the modulation of physical properties,which broadens their applications in flexible nanoelectronic and optoelectronic *** this review,we fist summari ze the methods of inducing strain to 2D materials and discuss the advantages and problems of various *** then introduce the strain induced effects on optical,electrical,and magnetic proper-ties,together with the phase transition of 2D ***,we ilustrate the potential applications of strained 2D materials and further look forward to their opportunities and challenges in practical applications in the future.

关键词： 2D materials photodetector piezoresistive effect strain engineering strain sensor

Two-Dimensional Black Phosphorus: An Emerging Anode material for Lithium-Ion Batteries

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Nano-Micro Letters 2020年第9期12卷 214-238页

作者： JiPing Zhu GuangShun Xiao XiuXiu Zuo school of materials Science and engineering Hefei University of TechnologyHefei 230009People’s Republic of China

Two-dimensional black phosphorus(2D BP),an emerging material,has aroused tremendous interest once *** is due to the fact that it integrates unprecedented properties of other 2D materials,such as tunable bandgap structures,outstanding electrochemical properties,anisotropic mechanical,thermodynamic,and photoelectric properties,making it of great research value in many *** emergence of 2D BP has greatly promoted the development of electrochemical energy storage devices,especially lithium-ion ***,in the application of 2D BP,there are still some problems to be solved urgently,such as the difficulty in the synthesis of large-scale high-quality phosphorene,poor environmental stability,and the volume expansion as electrode ***,according to the latest research progress of 2D BP in the field of energy storage,we systematically summarize and compare the preparation methods of phosphorene and discuss the basic structure and properties of BP,especially the environmental instability and passivation *** particular,the practical application and challenges of 2D BP as anode material for lithium-ion batteries are analyzed in ***,some personal perspectives on the future development and challenges of BP are presented.

关键词： Two-dimensional material Black phosphorus Lithium-ion batteries