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Science China(Technological Sciences) 2019年第9期62卷 1628-1635页

作者： LIN YingYing FENG Hao CHEN Rong YE DingDing ZHANG Biao YU YouXu LI JinWang Key Laboratory of Low-grade energy Utilization Technologies and Systems (Chongqing University) Ministry of EducationChongqing 400030China Institute of engineering Thermophysics School of Energy and Power EngineeringChongqing UniversityChongqing 400030China

The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass ***, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.

关键词： Ti2O3 full spectrum response microfluidic all-vanadium photoelectrochemical cell solar energy storage vanadium ion conversion rate

Very long wave infrared quantum cascade detector based on modular band structure

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Chinese Optics Letters 2024年第8期 124-128页

作者：郭凯陈雨朱怡璇黎昆翟慎强刘峰奇唐吉龙王晓华魏志鹏刘俊岐 State Key Laboratory of High power Semiconductor Lasers School of PhysicsChangchun University of Science and Technology Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences Center of Materials Science and Optoelectronics Technology University of Chinese Academy of Sciences

The optoelectronic performance of quantum cascade detectors （QCDs） is highly sensitive to the design of the energy level structure,leading to the inability of a single structure to achieve broad wavelength *** address this issue,we propose and demonstrate a modular concept for very long wave infrared （VLWIR） QCDs based on a miniband diagonal transition *** modular design makes the wavelength tuning only need to be adjusted for the absorption quantum well module rather than for the whole active *** simulation shows that the wavelength tuning range is 39.6 meV （～14–30μm）.To prove the feasibility of the scheme,three samples with different absorption well widths were fabricated and *** 10 K,the response wavelengths of the three QCDs are 14,16,and 18μm,respectively,corresponding to responsivities and detectivities exceeding 2 mA/W and 1×1010Jones.

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Transient Experiments on a Prototype Pump with an Atypical Open Impeller for Different Discharge Valve Openings

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Fluid Dynamics & Materials Processing 2024年第10期20卷 2251-2264页

作者： Xiao Sun Huifan Huang Yuliang Zhang Lianghuai Tong Xiaowei Xu Xiaoqi Jia Litao Ou school of Mechanical engineering Hunan University of TechnologyZhuzhou412007China College of Mechanical engineering Quzhou UniversityQuzhou324000China Quzhou Academy of Metrology and Quality Inspection Quzhou324024China The Zhejiang Provincial Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech UniversityHangzhou310018China Zhuzhou Nanfang Valve Co. Ltd.Zhuzhou412000China

In order to obtain the transient characteristics of a low-speed centrifugal pump during the start-up and shutdown stages,dedicated experimental tests were conducted with eight different valve opening *** Pearson correlation coefficient was used to reveal the linear correlation between *** to the results,the stable rotational speed decreases with increasing valve opening(rotational speed decreases from approximately 1472 to 1453 r/min),while the stable shaft power exhibits an increasing trend(shaft power increases from approximately 0.242 to 0.390 kW).The stable time and zeroing time of each parameter during start-up and shutdown processes vary,with the flow zeroing time significantly increasing with the relative flow,reaching up to 10.468 s,while the shaft power zeroing time is roughly between 1.219 and 1.375 *** results demonstrate that with increasing valve opening,the stable and zeroing time of flow significantly increase(|r|greater than 0.95),while the stable and zeroing time of rotational speed,power,and head display a smaller sensitivity on the valve opening(|r|less than 0.6).

关键词： Centrifugal pump startup shutdown external characteristics zeroing time

Regulating surface electron structure of PtNi nanoalloy via boron doping for high‐current‐density Li‐O2 batteries with low overpotential and long‐life cyclability

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SmartMat 2024年第1期5卷 110-120页

作者： Yajun Ding Yuanchao Huang Yuejiao Li Tao Zhang Zhong‐Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina State Key Laboratory of Silicon Materials and school of Materials Science and engineering Zhejiang UniversityHangzhouChina Institute of Advanced Semiconductors Hangzhou Innovation CenterZhejiang UniversityHangzhouChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Dalian National Laboratory for Clean energy Chinese Academy of SciencesDalianChina

The realization of high‐efficiency,reversible,stable,and safe Li‐O2 batteries is severely hindered by the large overpotential and side reactions,especially at high rate ***,rational design of cathode catalysts with high activity and stability is crucial to overcome the terrible issues at high current ***,we report a surface engineering strategy to adjust the surface electron structure of boron(B)‐doped PtNi nanoalloy on carbon nanotubes(PtNiB@CNTs)as an efficient bifunctional cathodic catalyst for high‐rate and long‐life Li‐O2 ***,the Li‐O2 batteries assembled with as‐prepared PtNiB@CNT catalyst exhibit ultrahigh discharge capacity of 20510 mA·h/g and extremely low overpotential of 0.48 V at a high current density of 1000 mA/g,both of which outperform the most reported Pt‐based catalysts ***,our Li‐O2 batteries offer excellent rate capability and ultra‐long cycling life of up to 210 cycles at 1000 mA/g under a fixed capacity of 1000 mA·h/g,which is two times longer than those of Pt@CNTs and PtNi@***,it is revealed that surface engineering of PtNi nanoalloy via B doping can efficiently tailor the electron structure of nanoalloy and optimize the adsorption of oxygen species,consequently delivering excellent Li‐O2 battery ***,this strategy of regulating the nanoalloy by doping nonmetallic elements will pave an avenue for the design of high‐performance catalysts for metal‐oxygen batteries.

关键词： B doping bifunctional catalyst Li‐O2 battery low charge overpotential PtNi nanoalloy

CdS nanoparticles decorated hexagonal Fe_(2)O_(3) nanosheets with a Z-scheme photogenerated electron transfer path for improved visible-light photocatalytic hydrogen production

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Chinese Journal of Chemical engineering 2022年第3期35卷 266-274页

作者： Feng Guo Haoran Sun Yuxing Shi Fengyu Zhou Weilong Shi school of energy and power Jiangsu University of Science and TechnologyZhenjiang 212003China school of Material Science and engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Photocatalytic water splitting for hydrogen production(H_(2))is one of the main potential applications of photocatalytic technology,which can use solar energy as the energy required for chemical reactions to alleviate the energy *** this work,zero-dimensional/two-dimensional(0D/2D)contact surface CdS/α-Fe_(2)O_(3)(CF)heterojunction photocatalyst was synthesized via a simple solvothermal *** hydrogen production experiments revealed that the CF-15 sample shows the optimal photocatalytic H_(2)rate(1806μmol·h^(-1)·g^(-1))and apparent quantum efficiency(AQE=13.7%atλ=420 nm).The enhancement of photocatalytic performance is mainly attributed to the contact of 0D/2D interface and the synergistic effect of Z-scheme electron transfer *** work provides an effective way for modified composite semiconductor photocatalyst by constructing special interface heterojunction to achieve highly efficiently catalysis.

关键词： Photocatalysis Hydrogen production 0D/2D CdS α-Fe_(2)O_(3) Z-scheme

DIRECT NUMERICAL SIMUIATION OF BUBBLE-CLUSTER’S DYNAMIC CHARACTERISTICS

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Journal of Hydrodynamics 2008年第6期20卷 689-695页

作者： CHEN Hui LI Sheng-cai ZUO Zhi-gang LI Shuai school of power and energy Northwestern Polytechnical University Xi＇an 710072 China school of engineering University of Warwick Coventry CV4 7AL UK

A Direct Numerical Simulation （DNS） for understanding the dynamic response of bubble cluster to pulses of pressure perturbations has been studied by using a front-tracking method. The results show that owing to high nonlinearity, the bubble shape and volume oscillations caused by passing by pressure wave will be transformed into an in-phase volumetric oscillation of whole bubble cluster at a particular low-frequency. The value of the frequency is independent of the pulse excitations but the characteristics of the bubble cluster such as its bubble size, bulk void fraction and its spacial distribution etc. It is believed that this study provides important information for us to understand the coupling mechanism of cavitation cloud involved in cavitation resonance, a phenomenon noticed by one of the authors more than two decades ago.

关键词： numerical simulation cavitation dynamics

Leaching kinetics and permeability of polyethyleneimine added ammonium sulfate on weathered crust elution-deposited rare earth ores

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Journal of Rare Earths 2024年第8期42卷 1610-1619,I0008页

作者： Huifang Yang Aoyang Sha Zhengyan He Chenjie Wu Yuanlai Xu Jingjing Hu Zhigao Xu Ru'an Chi Key Laboratory for Green Chemical Process of Ministry of Education School of Resources&Safety EngineeringWuhan Institute of TechnologyWuhan 430073China Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central MinzuUniversityWuhan430074China

At present,in-situ leaching of weathered crust elution-deposited rare earth ores(WCE-DREOs) encounter with problems such as long leaching cycles,slow infiltration rate and low product *** order to solve the above problems,the conventional leaching agent ammonium sulfate((NH_(4))_(2)SO_(4)) was compounded with polymeric surfactant polyethyleneimine(PEI) to form a composite leaching *** effects of leaching temperature,PEI *** rate and pH on leaching kinetics and permeability of rare earths(RE) and aluminum(AI) in orebody were *** is found that with temperature increasing,the time required to reach leaching equilibrium for both RE and Al is shortened,the apparent activation energies of RE and AI are 14.79 and 13.45 kJ/mol,respectively,and the leaching processes are in accordance with the outer diffusion control,When the concentrations of(NH_(4))_(2)SO_(4) and PEI in the composite leaching agent are 2.0 wt% and 0.4 wt%;the time required to reach leaching equilibrium for RE and AI is about 50% shorter than that using(NH_(4))_(2)SO_(4) alone,and the leaching efficiencies of RE are slightly higher than that of *** increasing the temperature and flow rate of the composite leaching agent can improve the leaching efficiencies of RE and Al,but pH has neglected effects on the leaching efficiencies of *** PEI concentrations below 0,4 wt%, the addition of PEI promotes the leaching of RE and *** column leaching studies of the WCE-DREO,the addition of 0.4 wt% PEI to the traditional leaching agent(NH_(4))_(2)SO_(4) has no impact on the leaching efficiencies of ***,it can significantly increase the infiltration rate of WCE-DREO,shortening the leaching time per 10 mL effluent from about 30 min for(NH_(4))_(2)SO_(4) leaching system to 20 min for the composite leaching *** leaching time is shortened by one-third,and the leaching cost is reduced,which can provide theoretical guidance for the development and commercial implementa

关键词： Polyethyleneimine Kinetics Rare earths Permeability Activation energy

A gel polymer electrolyte with IL@UiO-66-NH_(2) as fillers for high-performance all-solid-state lithium metal batteries

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矿物冶金与材料学报:英文版 2023年第10期30卷 1897-1905页

作者： Tao Wei Qi Zhang Sijia Wang Mengting Wang Ye Liu Cheng Sun Yanyan Zhou Qing Huang Xiangyun Qiu Fang Tian school of energy and power Jiangsu University of Science and TechnologyZhenjiang 212003China College of Materials Science and engineering Nanjing Forestry UniversityNanjing 210037China power&energy Storage System Research Center School of Mechanical and Electrical EngineeringQingdao UniversityQingdao 266071China College of chemical engineering and Materials Handan CollegeHandan 056005China

All solid-state electrolytes have the advantages of good mechanical and thermal properties for safer energy storage,but their energy density has been limited by low ionic conductivity and large interfacial resistance caused by the poor Li~+transport kinetics due to the solid-solid contacts between the electrodes and the solid-state ***,a novel gel polymer electrolyte(UPP-5)composed of ionic liquid incorporated metal-organic frameworks nanoparticles(IL@MOFs)is designed,it exhibits satisfying electrochemical performances,consisting of an excellent electrochemical stability window(5.5 V)and an improved Li^(+)transference number of ***,the Li/UPP-5/LiFePO_(4) full cells present an ultra-stable cycling performance at 0.2C for over 100 cycles almost without any decay in *** study might provide new insight to create an effective Li^(+)conductive network for the development of all-solid-state lithium-ion batteries.

关键词： all solid-state lithium-ion batteries metal-organic frameworks gel polymer electrolytes ionic liquid solid electrolyte interphase

Amended disturbance observer design and its application in active vibration control for piezoelectric structure 25th

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Amended disturbance observer design and its application in a...

Simulation of Terrestrial Dust Devil Patterns

第25届中国控制与决策会议

作者： Li shengquan Zhao Rong Li Juan Mo Yueping school of energy and power engineering Yangzhou University school of Automation Southeast University

ISBN: (纸本)9781467355339

To improve the vibration suppression performance of LQR based real structural vibration control system, an amended disturbance observer design method was presented for an all-clamped stiffened panel with unmodeled error, harmonic effect and acceleration sensor noise. Then, a compound control strategy is proposed to suppress the structural vibration excited by external sinusoidal disturbance, via combing the amended DOB and the traditional LQR optimized by the chaos sequence. Both theory analysis and vibration control experiment results have shown good disturbances and measurement noise rejection performances of the proposed active vibration control strategy.

关键词： active vibration control disturbance observer (DOB) stiffened panel piezoelectric optimal control

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Advances in Atmospheric Sciences 2008年第1期25卷 31-42页

作者：顾兆林邱剑赵永志李云 Department of Environmental Science and Technology School of Human Settlements and Civil Engineering Xi'an Jiaotong University school of energy and power engineering Xi'an Jiaotong University Department of Chemical engineering Tsinghua University

Introducing the surface properties [initial vortex, ground temperature and surface momentum impact height （SMIH）] for the boundary conditions, dust-devil-scale large eddy simulations （LES） were carried out. Given three parameters of initial vortex, ground temperature and the SMIH based on Sinclair＇s observation, the dust devil physical characteristics, such as maximum tangential velocity, updraft velocity, pressure drop in the inner core region, and even reverse flow at the top of the core region, are predicted, and are found to be close to the observations, thus demonstrating the ability of the simulation. The physical characteristics of different modeled dust devils are reproduced and compared to the values predicted by Renno et al.＇ theory. Even for smaller temperature differences or weaker buoyancy, severe dust devils may be formed by strong incipient vortices. It is also indicated that SMIH substantially affects the near-surface shape of terrestrial dust devils.

关键词： dust devil dust storm large eddy simulation (LES)