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Rare Earth Ion Yb^3+ Doping of Bi2WO6 with Excellent Visible-light Photocatalytic Activity

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 348-355页

作者： HE Jinyun YU Qi zhou yunpeng WANG Yanwu LONG Fei School of Materials Science and Engineering Guilin University of TechnologyGuilin 514004China Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of EducationGuilin University of TechnologyGuilin 541004China College of En-vironmental Science and Engineering Guilin University of TechnologyGuilin 541004China

The rare earth ion Yb^3+ doped Bi2WO6 photocatalysts were synthesized by hydrothermal ***,XRD,XPS,FESEM,TEM,Ramam,N2 adsorption-desorption isotherm measurements and UV-vis diffusion reflectance spectra were used to characterize the Yb^3+ doped Bi2WO6 *** morphology,specific surface area,and pore volume distribution were greatly affected after Yb3+ ions *** performance of Bi2WO6 was effectively enhanced after Yb3+ ions doping,6% Yb^3+ doped Bi2WO6 had the best photocatalytic performance,and 96.2% Rhodamine B was degradated after irradiated 30 min,which was 1.29 times that of the pristine *** enhanced photocatalytic performance was due to the increased specific surface area,decreased energy band gap and inhibition of photoelectron-hole recombination after Yb3+ ions doping.

关键词： Bi2WO6 rare earth ion doping visible-light photocatalytic activity hydrothermal method

Dual-mode Switching Fault Ride-through Control Strategy for Self-synchronous Wind Turbines

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 579-588页

作者： Xinshou Tian Yongning Chi Peng Cheng Wei He yunpeng zhou Jianzhu Hu China Institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing 100192China State Grid Zhejiang Electric Power Co. Economic and Technological Research InstituteHangzhouChina

The installed capacity of renewable energy generation has continued to grow rapidly in recent years along with the global energy transition towards a 100%renewable-based power *** the same time,the grid-connected large-scale renewable energy brings significant challenges to the safe and stable operation of the power system due to the loss of synchronous ***,self-synchronous wind turbines have attracted wide attention from both academia and ***,the understanding of the physical operation mechanisms of self-synchronous wind turbines is not *** particular,the transient characteristics and dynamic processes of wind turbines are fuzzy in the presence of grid ***,it is difficult to design an adaptive fault ride-through(FRT)control ***,a dual-mode switching FRT control strategy for self-synchronous wind turbines is *** FRT control strategies are *** one strategy,the amplitude and phase of the internal potential are directly calculated according to the voltage drop when a minor grid fault *** other dual-mode switching control strategy in the presence of a deep grid fault includes three parts:vector control during the grid fault,fault recovery vector control,and self-synchronous *** proposed control strategy can significantly mitigate transient overvoltage,overcurrent,and multifrequency oscillation,thereby resulting in enhanced transient ***,simulation results are provided to validate the proposed control strategy.

关键词： Dual-mode switching self-synchronous wind turbine transient stability fault ride-through(FRT)control

Crystal structure and optical performance analysis of a new type of persistent luminescence material with multi-functional application prospects

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Journal of Energy Chemistry 2022年第6期31卷 150-160,I0005页

作者： Songsong Ding Pohua Chen Haijie Guo Peng Feng yunpeng zhou Yuhua Wang Junliang Sun National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission Department of Materials ScienceSchool of Materials and EnergyLanzhou UniversityLanzhou 730000GansuChina College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China

Persistent luminescence (PersL) materials,as environmentally friendly and energy-saving materials,have broad application prospects in many fields such as lighting,chemistry and even ***,studies on the types,performances and mechanism of PersL materials are still insufficient,which significantly restricts their development and *** this consideration,we successfully synthesized a yellow PersL material CaSrGa_(4)O_(8)(CSG).The crystal structure was studied in detail through Rotation Electron Diffraction (RED) and Powder X-ray Diffraction (PXRD).What’s more,by co-doping Mn^(2+) and Yb^(3+),the afterglow brightness of CSG could be increased by nearly 20 times,and the afterglow duration could reach more than 6 *** is worth mentioning that the samples also have excellent performances in mechanical luminescence (ML),photostimulated luminescence (PSL) and cathodoluminescence (CL),which was also investigated ***,an anti-counterfeiting label was designed by the samples to reveal the potential of their application in *** results showed that our research not only provided a new candidate PersL material for multifunctional applications,but also gave good help for studying the physical and chemical properties of CSG.

关键词： Persistent luminescence Multifunctional materials Mechanoluminescence Anti-counterfeiting Cathodoluminescence

Application of New Calcium Aluminate Cement CA-670 in Low Cement Castables

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China's Refractories 2017年第3期26卷 23-31页

作者： LONG Bin zhou yunpeng ZHANG Lanyin REAS Buhr Qingdao Almatis Co. Ltd. Almatis GmbH

A new calcium aluminate cement CA-670 was studied in the system of tabular alumina, white fused alumina （WFA）, and bauxite based low cement castables. The flow ability, strength development, and hot strength （ HMOR ） were investigated. Different types of additives were used for the CA-670 bonded castables. The results show CA-670 provides a good workability for each type of＂ castables. CA-670 displays a good compatibility with different types of additives. Testing on different batches of CA-670 shows good reproducible properties in each castable, which manifests good consistency and reliability of CA-670.

关键词： CA-670 low cement castable flow ability strength development HMOR

Study on Chrome-free Purging Plugs for Steel Ladles

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China's Refractories 2024年第2期33卷 41-47页

作者： yunpeng zhou Wang FENG Shankha CHATTERJEE Andus BUHR Sebastian KLAUS Almatis Qingdao Co. Ltd.Qingdao 266510China Almatis Alumina Pvt Ltd. Kolkata 700071India Almatis GmbH Frankfurt 60528Germany

Purging plug refractories in China typically contain around 3 mass% of super-fine chromium oxide in the matrix in order to improve the performance of the purging plugs, primarily, slag corrosion and wear resistance. Alternatives to chromium oxide containing refractories have gained interest due to health concerns related to the formation of soluble chromium compounds over long storage periods of refractory wastes. Super-ground reactive alumina can replace chromium oxide in purging plug refractories and this paper discussed the new reactive alumina E-SY 88 in comparison to chromium oxide in a typical purging plug castable. The mixing behaviour, wet castable properties, as well as cured, dried, and fired properties at different temperatures up to 1 600 ℃ were compared. In addition, the hot modulus of rupture, creep behaviour, thermal shock resistance and slag corrosion resistance were tested. The microstructure after slag corrosion was investigated by SEM. The results prove that E-SY 88 is an economically viable technical alternative to chromium oxide in purging plug refractories.

关键词： purging plug alumina-spinel castable workability chromium-free thermal shock resistance

An efficient chemical reduction-induced assembly of Fe_(3)O_(4)@graphene fiber for wire-shaped supercapacitors with ultrahigh volumetric energy density

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Science China(Technological Sciences) 2021年第10期64卷 2246-2254页

作者： XIAO Peng SHI MinJie XU Li TAO FengBo LI Yu ZHU HangTian LIU YuTing LI ZhiMin zhou yunpeng FENG Wei State Grid Jiangsu Electric Power Co.Ltd.Research Institute Nanjing 211103China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Co.Ltd.Beijing 102211China School of Materials Science and Engineering Tianjin UniversityTianjin 300354China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215213China

Benefiting from high flexibility and weavability,the wire-shaped supercapacitors(SCs)arouse tremendous interests for the applications in wearable/portable *** fiber(GF)is considered as a promising linear electrode for wire-shaped ***,the bottleneck is how to develop the GF-based linear electrode with facile fabrication process while wellmaintaining satisfactory electrochemical ***,a novel Fe_(3)O_(4)@GF composite linear electrode is proposed via a chemical reduction-induced assembly approach,in which the GO and Fe_(3)O_(4) nanoparticles(NPs)realize the efficient selfassembly owing to the electrostatic and van der Waals interactions,as well as the sufficient reduction of GO during the preparation *** resultant fiber-shaped architecture shows boosted charge-transfer kinetics,high flexibility and structural *** Fe_(3)O_(4)@GF linear electrode exhibits excellent electrochemical behaviors including a large volumetric specific capacitance(~250.75 F cm^(−3)),remarkable rate capability and favorable electrochemical kinetics in aqueous electrolyte,superior than previously reported GF-based linear *** real application,a high-performance wire-shaped SC with excellent flexibility and weavability is fabricated based on such Fe_(3)O_(4)@GF linear electrode and gel electrolyte,demonstrating ultrahigh volumetric energy density(18.8 mWh cm^(−3)),power density(4000 mW cm^(−3))and strong durability(~93.5%retention after 10000 cycles).Prospectively,the fabricated wire-shaped SC can maintain reliable electrochemical behaviors in various deformation states,showing its potentials in future portable and wearable devices.

关键词： wire-shaped supercapacitors self-assembly graphene fiber high energy density wearable electronics

Review of Matrix Aluminas for Refractory Formulations

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China's Refractories 2015年第1期24卷 57-62页

作者： Andreas BUHR Rainer KOCKEGEY_LORENZ Lanyin ZHANG Bin LONG yunpeng zhou Zhongkai TIAN Almatis GmbH Qingdao Almatis Co. Ltd.

Historically,ground calcined aluminas were the first high-alumina matrix products that were used in refractory formulations, in both shaped and unshaped products. At that time the flow properties of castables were enhanced by the use of silica fume. This was followed later by the development of fully ground reactive aluminas which contributed to the design of the matrix below 63 μm. In addition to aggregate fines,a range of bi-modal and multi-modal reactive aluminas were also developed. These not only gave improved physical properties but also better castable workability. This paper reviews matrix alumina developments over time,from basic ground calcines to complex multi-modal matrix products and their globally standardised manufacture.

关键词： matrix fillers reactive alumina porosity strength global product concept

Effects of Specific Surface Area and Impurities of Reactive Alumina on Properties of Corundum Based Castables

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China's Refractories 2017年第4期26卷 37-43页

作者： ZHANG Ju zhou yunpeng LONG Bin ZHANG Lanyin LIU Jinxue Andreas BUHR JIA Quanli YE Guotian Zhengzhou University Zhengzhou 450001China Qingdao Almatis Co. Ltd.Qingdao 266510China Almatis GmbH Frankfurt 60528Germany

Effects of specific surface area and tiny amount of impurities of reactive alumina on the workability, sinte- ring and high temperature mechanical strength of corun- dum based castables were investigated. The results show that the presence of reactive alumina with high specific surface area leads to accelerating of the hydration of calcium aluminate cement, thus shortening the working time and setting time of the castables, which can be as- cribed that the critical energy barrier for stable nuclei of hydration products of cement can be reduced by the high specific surface area of reactive alumina. The sintering of the corundum based castables can be accelerated by the reactive alumina with high specific surface area and high amount of impurities, however, the reactive alumina with too high specific surface area and impurities can al- so lead to noticeable shrinkage of castables. In addition, high temperature mechanical strength of corundum based castables can be decreased by the higher amount of trace impurities of reactive alumina due to formation of low- melting phase at high temperatures.

关键词： reactive alumina specific surface area impurity corundum based eastables workability sintering

Relation Between Sintering Reactivity of Matrix and Thermal Shock Resistance of Ultra-low Cement Bonded Corundum-spinel Castables for Fired Purging Plugs

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China's Refractories 2018年第4期27卷 13-20页

作者： ZHANG Ju LONG Bin zhou yunpeng Andreas BUHR WANG Feng CUI Qingyang XIE Guofeng DING Dafei JIA Quanli YE Guotian Henan Key Laboratory of High Temperature Functional Ceramics School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Qingdao Almatis Co. Ltd.Qingdao 266510China Almatis GmbH Frankfurt 60528Germany Luoyang LIRR Refractories Co. Ltd.Luoyang 471000China

Purging plugs installed in the bottom of steel ladles are widely used for the secondary refining of high quality steel *** dynamic service conditions and temperature gradients caused by the cold inert gas blown through the plug during stirring create a strong thermal shock impact on the *** can affect its service life and restrict the safety and efficiency of steel making if the plug fails during *** this work,the influence of the particle size distribution (PSD) and amount of reactive alumina on the sintering behavior of ultra-low cement bonded corundum-spinel based castables was investigated on lab *** relationship between sintering reactivity of matrix and thermal shock resistance of castables was evaluated in *** show that the sintering of castables can be intensified by using finer reactive ***,excessive sintering of the castable through finer reactive alumina is negative for thermal shock *** microstructure characterization reveals that castables with more intense sintering show denser matrix structure,which is less effective in hampering crack propagation and therefore results in decline of their thermal shock resistance.

关键词： reactive alumina corundum-spinel castable sintering reactivity thermal shock resistance