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Biowaste derived porous carbon sponge for high performance supercapacitors

Journal of Materials Science & technology 2021年第36期95卷 105-113页

作者： Wenbin Zhang Bei Liu Mei Yang Yijiang Liu Huaming Li Pingle Liu College of Chemistry Xiangtan UniversityXiangtan 411105China Postdoctoral Station of Chemical Engineering and Technology Xiangtan UniversityXiangtan 411105China Key Laboratory of Polymeric Materials&Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Provinceand Key Lab of Environment-Friendly Chemistry and Application in Ministry of EducationXiangtan UniversityXiangtan 411105China College of Chemical Engineering Xiangtan UniversityXiangtan 411105China

Here,an agricultural waste(the stem pith of helianthus annuus,SPHA)is firstly used as the precursor for preparing three-dimensional(3D)porous carbon sponge(PCS).The as-prepared 3D PCS(SPHA-700)possesses unique sponge-like structure,large specific surface area(SSA)and high nitrogen doping level(4.52 at.%),which benefit the enhancement of conductivity(5.8 S cm;)and *** a binder-free electrode for solid-state symmetric supercapacitor,SPHA-700 delivers a relatively high specific capacitance of137.1 F g^(-1)at 0.5 Ag^(-1).Moreover,activated SPHA-700(SPHA-ac-700–2)displays an even higher specific capacitance(403.6 F g^(-1)at 0.5 Ag^(-1))in 6.0 M KOH *** SPHA-ac-700–2-based symmetrical supercapacitor can offer high specific capacitance(271 F g^(-1)at 1 Ag^(-1))and good rate capability(82.1%of capacitance retention at 1–80 Ag^(-1))in 6.0 M KOH electrolyte,together with high energy density(23.3 Wh kg^(-1)at 450 W kg^(-1))in 1.0 M Na_(2)SO_(4)*** excellent performance of SPHA-ac-700–2 is believed to have originated from the crushed sponge-like structure,O/N-co-doping(10.6 at.%O and3.3 at.%N),high SSA,large total pore volume,and hierarchical pore structure.

关键词： Agricultural waste Carbon sponge Three-dimension Supercapacitors

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Synergically improved energy storage performance and stability in sol–gel processed BaTiO_(3)/(Pb,La,Ca)TiO_(3)/BaTiO_(3) tri-layer films with a crystalline engineered sandwich structure

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Journal of Advanced Ceramics 2023年第12期12卷 2300-2314页

作者： Jinpeng Liu Ying Wang Hanfei Zhu Hongyu Luo Xiao Zhai Yu Huan Jing Yan Kun Wang Chao Liu Hongbo Cheng Jun Ouyang School of Chemistry and Chemical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Physics Shandong UniversityJinan 250100China School of Material Science and Engineering University of JinanJinan 250022China College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250200China China Tobacco Shandong Industrial Co. Ltd.Jinan 250014China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China

Achieving an excellent energy storage performance,together with high cycling reliability,is desirable for expanding technological applications of ferroelectric ***,in well-crystallized ferroelectric materials,the concomitant high polarizability and low polarization saturation field have led to a square-shaped polarization–electric field loop,fatally impairing both recoverable energy density(W_(rec))and efficiency(η).Nanocrystalline ferroelectric films with a macroscopically amorphous structure have shown an improved W_(rec) andη,but their much lower polarizability demands an extremely high electric field to achieve such performances,which is undesirable from an economic ***,we propose a strategy to boost the energy storage performances and stability of ferroelectric capacitors simultaneously by constructing a tri-layer film in which a well-crystallized ferroelectric layer was sandwiched by two pseudo-linear dielectric layers with a dominant amorphous *** sol–gel-derived BaTiO_(3)/(Pb,La,Ca)TiO_(3)/BaTiO_(3)(BTO/PLCT/BTO)tri-layer films,we show that the above design is realized via rapid thermal annealing which fully crystallized the middle PLCT layer while left the top/bottom BTO cap layers in a poor crystallization *** sandwiched structure is endowed with an enhanced maximum polarization while a small remnant one and a much-delayed polarization saturation,which corresponds to large W_(rec)≈80 J/cm^(3) and highη≈86%.Furthermore,the film showed an outstanding cycling stability:its W_(rec) andηremain essentially unchanged after 10^(9) electric cycles(DW/W<4%,Dη/η<2%).These good energy storage characteristics have proved the effectiveness of our proposed strategy,paving a way for the utilization of sandwiched films in applications of electric power systems and advanced pulsed-discharge devices.

关键词： energy storage sandwich film amorphous structure nanocrystal cluster stability

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Optimal Scheduling Method for Battery Energy Storage Based on Adaptive Time Granularity 7

Optimal Scheduling Method for Battery Energy Storage Based o...

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7th IEEE International Conference on Power and Renewable Energy, ICPRE 2022

作者： Luo, Shuchen Wen, Ming Li, Wenying Liao, Jing Xiong, Dezhi Zhong, Yuan Power Economic and Technology Research Institute Key Laboratory of Hunan Province for Energy Internet Supply and Demand Operation State Grid Hunan Electric Changsha China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology State Grid Hunan Electric Power Limited Company Power Supply Service Center Metrology Center Changsha China State Grid Hunan Electric Power Economic and Technology Research Institute Key Laboratory of Hunan Province for Energy Internet Supply and Demand Operation Changsha China

ISBN: (数字)9781665450638

ISBN: (纸本)9781665450638

With the integration of many intermittent and distributed new energy sources into the power grid, the safe and stable operation of the power system is facing huge challenges. HVAC (Heating, Ventilation and Air Conditioning, HVAC), electric vehicles (EV), and battery energy storage (BESS) can be a solution to this problem due to high flexibility and strong controllability. Aiming at the problem of power imbalance caused by large-scale wind power integration, this paper proposed an optimal scheduling method of HVAC and BESS based on adaptive time granularity. Time granularity is critical to the optimization of scheduling methods, which is decided by the load fluctuation in this paper. The simulation results showed that reducing the time granularity can smooth the fluctuation of the tie-line but would increase the scheduling cost and the amount of calculation. © 2022 IEEE.

关键词： Wind power

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Synthesis of Electron-Rich Benzbisimidazole-Containing Amorphous Poly(Schiff-Base) Networks for Efficient Iodine Capture

SSRN

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SSRN 2023年

作者： Wen, Jikai Hu, Fangqi Liu, Bei Chen, Hongbiao Yang, Mei Liu, Yijiang Li, Huaming College of Chemistry Xiangtan University Hunan Province Xiangtan411105 China Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education Key Laboratory of Polymeric Materials & Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province Xiangtan University Hunan Province Xiangtan411105 China

In this work, two benzbisimidazole-containing amorphous poly(Schiff-base) networks (namely ATA-BA and ATA-BZ) are synthesized by reacting benzbisimidazole-containing aromatic tetra-aldehyde building block (ATA) with benzene-1,4-diamine and benzidine, respectively, under solvothermal conditions. The resultant ATA-BA and ATA-BZ networks possess the specific surface areas of 113 and 87 m2 g−1, respectively. Owing to the presence of abundant imine bonds, alkyl-substituted imidazole rings, and extended π-conjugated systems, ATA-BA network can effectively capture iodine in both vapor and solution phases with capture capacities up to 5.29 g g−1 and 2343 mg g−1, respectively, although its specific surface area is moderately high. In addition, the iodine capture by ATA-BA network in cyclohexane solution is systematically investigated. The experimental results indicate that the iodine adsorption kinetics and capture behavior obey the pseudo-second-order model and Freundlich isotherm model, respectively. © 2023, The Authors. All rights reserved.

关键词： Specific surface area

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A Study on application of Artificial Intelligence in College English Teaching Management and Evaluation 3

A Study on Application of Artificial Intelligence in College...

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3rd International Conference on Electronic Informationtechnology and Smart Agriculture, ICEITSA 2023

作者： Feng, Tao Deng, Jianjie Liu, Yiwen Gao, Yanxia Peng, Ling Fu, Jinrong School of Foreign Languages Huaihua University Hunan Huaihua418000 China School of Computer and Artificial Intelligence Huaihua University Hunan Huaihua418000 China Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing and Application in Hunan Province Universities Hunan Huaihua418000 China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Hunan Huaihua418000 China School of Computing Science University of Glasgow GlasgowG12 8QQ United Kingdom

ISBN: (纸本)9798400716775

With the rapid development of artificial intelligence, AI technology has been widely applied in various industries, including education. In English teaching, AI technology provides teachers with objective and instructive feedback, offers students a more personalized learning experience, helping them improve their English language skills, etc., and brings new development opportunities and challenges to English teaching as well. However, there are still some problems that need to be solved in college English teaching in our university. For this reason, based on the application of AI technology in college English teaching, this paper mainly explores the impact and application countermeasures of AI on college English teaching from the following four aspects: individuals with differences, teaching management, classroom teaching and teaching evaluation. In addition, the profound integration of college English education and AI will foster the advancement and transformation of college English instruction, ultimately serving as a catalyst for its reform. © 2023 ACM.

关键词： Artificial intelligence

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Surface group directed low-temperature synthesis and self-assembly of Al nanostructures for lithium storage

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Nano Research 2023年第1期16卷 1733-1739页

作者： Xianglong Kong Zhi Li Xudong Zhao Shunpeng Chen Zhuoyan Wu Fei He Piaoping Yang Xinghua Chang Xingguo Li Zhiliang Liu Jie Zheng College of Material Sciences and Chemical Engineering Harbin Engineering UniversityHarbin 150001China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Comprehensive Energy Research Center Institute of Science and TechnologyChina Three Gorges CorporationBeijing 100038China Key Laboratory for Mineral Materials and Application of Hunan Province School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China

Nanostructured aluminum recently delivers a variety of new applications of the earth-abundant Al resource due to the unique properties,but its controllable synthesis remains very challenging with harsh conditions and spontaneously flammable ***,a surface group directed method is developed to efficiently achieve low-temperature synthesis and selfassembly of zero-dimensional(0D)Al nanocrystals over one-dimensional(1D)carbon fibers(Al@CFs)through non-flammable AlCl3 reduction at 70°*** calculations unveil surface‒OLi groups of carbon fibers exert efficient binding effect to AlCl3,which guides intimate adsorption and in-situ self-assembly of the generated Al *** distinctive 0D-over-1D Al@CFs provides long 1D conductive networks for electron transfer,ultrafine 0D Al nanocrystals for fast lithiation and excellent buffering effect for volume change,thus exhibiting high structure stability and superior lithium storage *** work paves the way for mild and controllable synthesis of Al-based nanomaterials for new high-value applications.

关键词： Al nanostructure low-temperature synthesis self-assembly surface group lithium storage

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Synthesis and Properties of Chiral Liquid Crystal Copolymers with Tunable Circularly Polarized Luminescence

SSRN

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SSRN 2024年

作者： Huang, Sha Tan, Pengfei Luo, Renhua Tan, Bo Yuan, Yongjie Yu, Yan Zhang, Hailiang Key Laboratory of Polymeric Materials and Application Technology of Hunan Province Key Laboratory of Advanced Organic Functional Materials of Colleges Universities of Hunan Province College of Chemistry Xiangtan University Hunan Province Xiangtan411105 China School of Chemistry and Materials Engineering Huizhou University Guangdong Province Huizhou516007 China

Chiral liquid crystals have received widespread attention due to their unique advantages in improving circularly polarized luminescence (CPL) properties. However, how to achieve the emission and modulation of CPL for chiral liquid crystals within intrinsic polymer-based materials through a simple strategy remains a challenge. This article proposes a simple and feasible method to synthesize CPL chiral liquid crystals and manipulate their properties by copolymerizing chiral liquid crystal monomer with luminescent monomer. A series of intrinsic chiral luminescent liquid crystal copolymers C*(x)-Py(y) with tunable CPL performance were synthesized by copolymerizing chiral liquid crystal monomer MA6C* with pyrene-based luminescent monomer MC6Py in varying ratios. The effective control of the chiral liquid crystal phase structure and CPL performance of the copolymers C*(x)-Py(y) can be achieved by altering the composition of copolymers. In the copolymers, the CPL signal is generated due to the helix induction of pyrene chromophores by the chiral liquid crystals, and the CPL signal can be inverted and amplified by the unique selective reflection properties of chiral liquid crystals. For copolymer C*(0.75)-Py(0.25), the luminescence dissymmetry factor value and solid-state fluorescence quantum yield can reach -0.052 and 43.12%, respectively. © 2024, The Authors. All rights reserved.

关键词： Monomers

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A DESIGN OF BOX-METER BINDING SYSTEM FOR POWER METERING BOX 22

A DESIGN OF BOX-METER BINDING SYSTEM FOR POWER METERING BOX

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3rd International Conference on Control, robotics and Intelligent System, CCRIS 2022

作者： He, Xing Huang, Rui Yu, Minqi Zeng, Wenwei Zhang, Suihan State Grid Hunan Electric Power Company Limited Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan410000 China College of Electrical and Information Engineering Hunan University Changsha Hunan410000 China State Grid Hunan Electric Power Company Limited China and Hunan Prov. Key Lab. of Intelligent Electrical Measurement and Application Technology China

ISBN: (纸本)9781450396851

At present, most of the topological identification and binding methods of box tables in power metering boxes are supported by the later platform algorithm. When installing or replacing electricity meters is installed, it is easy to lead to the wrong identification of box-meter binding. In this paper, the MCU and the multi-channel RFID identification board to obtain the asset information in the meter label, record the asset information data analysis and forward, and realize the accurate search, positioning, identification, recording, binding and other functions in the metering box. After the realization of the table and box relationship binding, the system establishes the relationship table internally, uploads the box and table relationship table to the energy controller through HPLC (High Performance Liquid Chromatography), and establishes the box and table ledger data of each metering box in the platform area. Through this method, the binding relationship between the individual meter and the corresponding position in the box is realized, which solves the problems of the meter management chaos and the box meter position relationship in the operation and maintenance process, which is of great significance to the humanized and efficient development of smart meters. © 2022 ACM.

关键词： Radio frequency identification (RFID)

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Pushing the high-k scalability limit with a superparaelectric gate layer

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Journal of Advanced Ceramics 2024年第4期13卷 539-547页

作者： Kun Wang Chao Liu Yuan Zhang Fuyu Lv Jun Ouyang Houbing Huang Rui-Long Yang Yu-Yao Zhao Hongbo Cheng Hanfei Zhu Xiaoming Shi Yun Tian Institute of Advanced Energy Materials and Chemistry Jinan Engineering Laboratory for Multi-scale Functional MaterialsSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China China Tobacco Shandong Industrial Co. Ltd.Jinan 250104China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) School of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China Advanced Research Institute of Multidisciplinary Science and School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032China

To meet the expectation set by Moore’s law on transistors,the search for thickness-scalable high dielectric constant(k)gate layers has become an emergent research *** investigations have failed to solve the“polarizability–scalability–insulation robustness”*** this work,we show that this trilemma can be solved by using a gate layer of a high k ferroelectric oxide in its superparaelectric(SPE)*** the SPE,its polar order becomes local and is dispersed in an amorphous matrix with a crystalline size down to a few nanometers,leading to an excellent dimensional scalability and a good field-stability of the k *** an example,a stable high k value(37±3)is shown in ultrathin SPE films of(Ba_(0.95),Sr_(0.05))(Zr_(0.2),Ti_(0.8))O_(3)deposited on LaNiO_(3)-buffered Pt/Ti/SiO_(2)/(100)Si down to a 4 nm thickness,leading to a small equivalent oxide thickness of~0.46 *** aforementioned characteristic microstructure endows the SPE film a high breakdown strength(~10.5 MV·cm^(−1)for the 4 nm film),and hence ensures a low leakage current for the operation of the complementary metal oxide semiconductor(CMOS)***,a high electrical fatigue resistance is displayed by the SPE *** results reveal a great potential of superparaelectric materials as gate dielectrics in the next-generation microelectronics.

关键词： high-k transistors Moore's law superparaelectric insulation robustness

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Multi-State Recognition Method of Substation Switchgear Based on Image Enhancement and Deep Learning

Multi-State Recognition Method of Substation Switchgear Base...

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2022 International Conference on Mechatronics and Automation technology, ICMAT 2022

作者： He, Xing Huang, Rui Yu, Minqi Zeng, Wenwei Zhang, Suihan State Grid Hunan Electric Power Company Limited Hunan Changsha410000 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha410000 China College of Electrical and Information Engineering Hunan University Hunan Changsha410000 China

ISBN: (纸本)9781643683669

s. Since the current substation robot inspection process exists in the high-voltage switchgear status recognition is highly susceptible to the influence of complex environments such as low image contrast, light clutter interference, and blurred reading status details, this paper proposes an image enhancement and deep learning based substation switchgear state recognition method. A multi-scale Retinex-based image enhancement is proposed to enhance the adaptability of outdoor switchgear images to light changes;improve the YOLOx target detection network to introduces a lightweight ECA attention mechanism without dimensionality reduction based on the original YOLOx model's backbone network CSPDarknet, allowing the model to learn classification features while also focusing on learning spatial features. The experimental results show that the improved network can accurately identify the boundary information of anomalies, and the quality of its prediction results will not be reduced for noise-containing data, and the network shows strong generalization, robustness, accuracy and rapidity, providing certain conditions for realizing substation equipment condition monitoring. © 2022 The authors and IOS Press.

关键词： Image enhancement

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