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electrostatic field Enhanced Photocatalytic CO_(2) Conversion on BiVO_(4) Nanowires

Nano-Micro Letters 2022年第1期14卷 250-261页

作者： Shuai Yue Lu Chen Manke Zhang Zhe Liu Tao Chen Mingzheng Xie Zhen Cao Weihua Han Key Laboratory for Environmental Pollution Prediction and Control of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000People’s Republic of China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000People’s Republic of China

The recombination loss of photo-carriers in photocatalytic systems fatally determines the energy conversion efficiency of *** this work,an electrostatic field was used to inhibit the recombination of photo-carriers in photocatalysts by separating photo-holes and photo-electrons in *** a model structure,(010)facet-exposed BiVO_(4)nanowires were grown on PDMS-insulated piezo-substrate of piezoelectric transducer(PZT).The PZT substrate will generate an electrostatic field under a certain stress,and the photocatalytic behavior of BiVO_(4) nanowires is influenced by the electrostatic *** results showed that the photocatalytic performance of the BiVO_(4) nanowires in CO_(2)reduction in the negative electrostatic field is enhanced to 5.5-fold of that without electrostatic ***,the concentration of methane in the products was raised from 29% to 64%.The enhanced CO_(2) reduction efficiency is mainly attributed to the inhibited recombination loss of photo-carriers in the BiVO_(4) *** increased energy of photo-carriers and the enhanced surface absorption to polar molecules,which are CO in this case,were also play important roles in improving the photocatalytic activity of the photocatalyst and product *** work proposed an effective strategy to improve photo-carriers separation/transfer dynamics in the photocatalytic systems,which will also be a favorable reference for photovoltaic and photodetecting devices.

关键词： Photocatalysis CO_(2)reduction electrostatic field BiVO_(4)nanowires

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Orientation of KRb molecules in a switched electrostatic field

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Chinese Physics B 2013年第5期22卷 290-294页

作者：黄云霞徐淑武杨晓华 School of Science Nantong University State Key Laboratory of Precision Spectroscopy East China Normal University

We theoretically investigate the orientation of the cold KRb molecules induced in a switched electrostatic field by numerically solving the full time-dependent Schr6dinger equation. The results show that the periodic field-free molecular orientation can be realized for the KRb molecules by rapidly switching off the electrostatic field. Meanwhile, by varying the switching times of the electrostatic field, the adiabatic and nonadiabatic interactions of the molecules with the applied field can be realized. Moreover, the influences of the electrostatic field strength and the rotational temperature to the degree of the molecular orientation are studied. The investigations show that increasing the electrostatic field will increase the degree of the molecular orientation, both in the constant-field regime and in the field-free regime, while the increasing of the rotational temperature of the cold molecules will greatly decrease the degree of the molecular orientation.

关键词： orientation KRb molecule electrostatic field

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Effect of an electrostatic field on gas adsorption and diffusion in tectonic coal

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International Journal of Mining Science and Technology 2015年第4期25卷 607-613页

作者： Jian Kuo Lei Dongji Fu Xuehai Zhang Yugui Li Hengle School of Resources and Earth Science China University of Mining & Technology School of Safety Science and Engineering Henan Polytechnic University

The characteristics of adsorption, desorption, and diffusion of gas in tectonic coal are important for the prediction of coal and gas outbursts. Three types of coal samples, of which both metamorphic grade and degree of damage is different, were selected from Tongchun, Qilin, and Pingdingshan mines. Using a series of experiments in an electrostatic field, we analyzed the characteristics of gas adsorption and diffusion in tectonic coal. We found that gas adsorption in coal conforms to the Langmuir equation in an electrostatic field. Both the depth of the adsorption potential well and the coal molecular electroneg- ativity increases under the action of an electrostatic field. A Joule heating effect was caused by changing the coal-gas system conductivity in an electrostatic field. The quantity of gas adsorbed and AP result from competition between the depth of the adsorption potential well, the coal molecular electronegativ- ity, and the Joule heating effect. △P peaks when the three factors control behavior equally. Compared with anthracite, the impact of the electrostatic field on the gas diffusion capacity of middle and high rank coals is greater. Compared with the original coal, the gas adsorption quantity,△P, and the gas diffusion capacity of tectonic coal are greater in an electrostatic field. In addition, the smaller the particle size of tectonic coal, the larger the△P.

关键词： electrostatic field Tectonic coal Depth of adsorption potential well Joule heating effect Initial velocity of gas diffusion

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Effects of Different Parameters of electrostatic field on Removal of Ethylene in Fruit and Vegetable Storage Environment

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Agricultural Biotechnology 2023年第1期12卷 21-23,34页

作者： Weijun CHEN Wenting DAI Zhuangsheng WU Xiaojuan WANG Hao DENG Qiang ZHANG Hainan College of Economics and Business Haikou 571127China Hainan Academy of Agricultural Sciences Haikou 571100China

[Objectives]The effects of different parameters of electrostatic field on the removal of ethylene from fruit and vegetable storage environment were studied. [Methods]The high voltage electrostatic field technology was used to simulate the removal of ethylene from fruit and vegetable storages, and its influencing factors were tested and analyzed. [Results] The removal effect of needle-plate electrodes was better than that of needle electrodes. The removal effect of ethylene at high voltage was better than that at low voltage. The length of gas chamber was positively correlated with the time required for ethylene removal. Increasing the voltage could produce more ozone, thus improving the removal effect of ethylene. [Conclusions] This study provides theoretical basis and technical support for the use of high-voltage electrostatic field to remove ethylene in controlled atmosphere storages.

关键词： electrostatic field Fruit and vegetable storage Ethylene

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The Phase Transition of Syndiotactic Polystyrene Induced by electrostatic field

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Journal of Shanghai University(English Edition) 2002年第2期6卷 176-180页

作者：肖学山袁月董远达莫志深陈庆勇王庆徐辉 Institute of Materials School of Materials Science and Engineering Shanghai University Shanghai China Polymer Physics Laboratory Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun China

The crystal structure and morphology of syndiotactic polystyrene (sPS) melt crystallized in various electrostatic fields have been investigated by using wide angle X ray diffraction (WAXD), differential scanning calorimeter (DSC) and scanning electron microscope (SEM). WAXD and DSC analyses show that sPS is gradually transformed from α phase to β phase with increase of electrostatic intensity. The SEM observations indicate that the morphology of sPS micro crystals is strongly dependent on electrostatic intensity applied to the sample during solidification. The variation of the micro crystals orientation from disordered lamellae to ordered lamellare have been observed with increase of electrostatic intensity.

关键词： electrostatic field syndiotactic polystyrene crystallization.

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Toward high-efficiency perovskite solar cells with one-dimensional oriented nanostructured electron transport materials

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Journal of Energy Chemistry 2023年第7期82卷 66-87,I0003页

作者： Yinhua Lv Bing Cai Ruihan Yuan Yihui Wu Quinn Qiao Wen-Hua Zhang Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan UniversityKunming 650500YunnanChina School of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNew York 13244USA Yunnan University and Southwest United Graduate School Kunming 650500YunnanChina

The unique advantages of one-dimensional(1D)oriented nanostructures in light-trapping and chargetransport make them competitive candidates in photovoltaic(PV)*** the emergence of perovskite solar cells(PSCs),1D nanostructured electron transport materials(ETMs)have drawn tremendous ***,the power conversion efficiencies(PCEs)of these devices have always significantly lagged behind their mesoscopic and planar ***-efficiency PSCs with 1D ETMs showing efficiency over 22%were just realized in the most recent *** yet lacks a comprehensive review covering the development of 1D ETMs and their application in *** hence timely summarize the advances in 1D ETMs-based solar cells,emphasizing on the fundamental and optimization issues of charge separation and collection ability,and their influence on PV *** sketching the classification and requirements for high-efficiency 1D nanostructured solar cells,we highlight the applicability of 1D TiO_(2)nanostructures in PSCs,including nanotubes,nanorods,nanocones,and nanopyramids,and carefully analyze how the electrostatic field affects cell *** kinds of oriented nanostructures,e.g.,ZnO and SnO_(2)ETMs,are also ***,we discuss the challenges and propose some potential strategies to further boost device *** review provides a broad range of valuable work in this fast-developing field,which we hope will stimulate research enthusiasm to push PSCs to an unprecedented level.

关键词： 1D nanostructures Perovskite solar cells Electron transport materials electrostatic field High-efficiency

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Performance improvement of AlGaN-based deep ultraviolet light-emitting diodes with double electron blocking layers

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Chinese Physics B 2016年第2期25卷 538-543页

作者：张诚孙慧卿李旭娜孙浩范宣聪张柱定郭志友 Laboratory of Nanophotonic Functional Materials and Devices Institute of Opto-Electronic Materials and TechnologySouth China Normal University

The AlGaN-based deep ultraviolet light-emitting diodes（LED） with double electron blocking layers（d-EBLs） on both sides of the active region are investigated theoretically. They possess many excellent performances compared with the conventional structure with only a single electron blocking layer, such as a higher recombination rate, improved light output power and internal quantum efficiency（IQE）. The reasons can be concluded as follows. On the one hand, the weakened electrostatic field within the quantum wells（QWs） enhances the electron–hole spatial overlap in QWs, and therefore increases the probability of radioactive recombination. On the other hand, the added n-AlGaN layer can not only prevent holes from overflowing into the n-side region but also act as another electron source, providing more electrons.

关键词： double electron blocking layers ultraviolet light-emitting diodes n-A1GaN electrostatic field

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Efficiency enhancement of InGaN based blue light emitting diodes with InGaN/GaN multilayer barriers

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Chinese Physics B 2012年第11期21卷 528-532页

作者：童金辉李述体卢太平刘超王海龙仵乐娟赵璧君王幸福陈鑫 Institute of Opto-electronic Materials and Technology South China Normal University

The advantages of InGaN based light-emitting diodes with InGaN/GaN multilayer barriers are studied. It is found that the structure with InGaN/GaN multilayer barriers shows improved light output power, lower current leakage, and less efficiency droop over its conventional InGaN/GaN counterparts. Based on the numerical simulation and analysis, these improvements on the electrical and the optical characteristics are mainly attributed to the alleviation of the electrostatic field in the quantum wells （QWs） when the InGaN/GaN multilayer barriers are used.

关键词： GaN based light-emitting diode InGaN/GaN multilayer barriers electrostatic field

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Droop improvement in blue InGaN light-emitting diodes with GaN/InGaN superlattice barriers

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Chinese Physics B 2013年第6期22卷 651-655页

作者：童金辉赵璧君王幸福陈鑫任志伟李丹伟卓祥景章俊易翰翔李述体 Institute of Opto-electronic Materials and Technology South China Normal University

GaN/InGaN superlattice barriers are used in InGaN-based light-emitting diodes （LEDs）. The electrostatic field in the quantum wells, electron hole wavefunction overlap, carrier concentration, spontaneous emission spectrum, light-current performance curve, and internal quantum efficiency are numerically investigated using the APSYS simulation software. It is found that the structure with GaN/InGaN superlattice barriers shows improved light output power, and lower current leakage and efficiency droop. According to our numerical simulation and analysis, these improvements in the electrical and optical characteristics are mainly attributed to the alleviation of the electrostatic field in the active region.

关键词： GaN-based light-emitting diodes GaN/InGaN superlattice barriers electrostatic field

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Effect of thermal diffusion and electrostatic force on evolution of wind-blown sand flow

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Applied Mathematics and Mechanics(English Edition) 2007年第2期28卷 183-192页

作者：岳高伟郑晓静 The Key Laboratory of Western China's Environmental Systems Department of MechanicsLanzhou University

A theoretical model is suggested to mathematically describe the effect of thermal diffusion from a sand-bed on evolution of a wind-blown sand flow. An upward wind field is engendered by the thermal diffusion and the coupling interaction among the horizontal and upward wind flow, saltating grains, and a kind of electrostatic force exerted on the grains are considered in this theoretical model. The numerical results show that the effect of the thermal diffusion on the evolution process of wind-blown groan flow is quite obvious and very similar to the effect of the electrostatic force on the evolution. Not only the time for the entire system to reach a steady state （called the duration time）, the transport rate of grains, the mass-flux profiles and the trajectory of saltating grains are affected by the thermal diffusion and the electrostatic force exerted on saltating grains, but also the wind profiles and the temperature profiles at the steady state are affected by the wind-blown sand flow.

关键词： thermal diffusion transport rate of gains electrostatic field wind-blowngains malti-field coupling

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