检索结果-南通市图书馆

Rare Metals 2024年第2期43卷 431-454页

作者： Rui-Jie Zhu Jiang Liu Chao Hua Hao-Yu Pan Yi-Jun Cao Meng Li Zhongyuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou450001China School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Solid-state flexible supercapacitors(SCs)have many advantages of high specific capacitance,excellent flexibility,fast charging and discharging,high power density,environmental friendliness,high safety,light weight,ductility,and long cycle stability.They are the ideal choice for the development of flexible energy storage technology in the future,and provide a good prospect for energy storage applications.At present,solid-state flexible SCs are widely used for portable electronic equipment and wearable energy storage equipment,the research of them has become the focus of a growing number of researchers.Electrode material is the key part of SCs and always determines the electrochemical performance of SCs.It has been a hotspot and focus of research.Vanadium-based compounds are considered to be a promising electrode material for SCs because of variable valence,open structure,high theoretical capacity,and low price.Therefore,this study first gives an overview of solid-state flexible SCs,then reviews the current research status of vanadium-based electrode materials in solid-state flexible SCs,and proposes some strategies to solve some problems of vanadium-based electrode materials.

关键词： Vanadium-based materials Flexible energy storage specific capacitance Supercapacitors(SCs)

N-Doped rGO-Like Carbon Prepared from Coconut Shell:Structure and specific capacitance

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第4期11卷 1823-1833页

作者： Imam Khambali Budhi Priyanto Retno Asih Malik Anjelh Baqiya Muhammad Mahyiddin Ramli Nurul Huda Osman Sarayut Tunmee Hideki Nakajima Triwikantoro Mochamad Zainuri Darminto Department of Physics Faculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabaya60111Indonesia Department of Electrical Engineering Faculty of EngineeringUniversity of Muhammadiyah MalangMalang65144Indonesia Geopolymer&Green Technology Centre of Excellence Universiti Malaysia PerlisArauPerlis02600Malaysia Applied Electromagnetic Laboratory 1 Department of PhysicsFaculty of ScienceUniversiti Putra MalaysiaSelangor43400Malaysia Synchrotron Light Research Institute(SLRI) Nakhon Ratchasima3000Thailand

An rGO−like carbon compound has been synthesized from biomass,i.e.,old coconut shell,by a carbonization process followed by heating at 400°C for 5 h.The nitrogen doping was achieved by adding the urea(CH4N2O)and stirring at 70°C for 14 h.The morphology and structure of the rGO-like carbon were investigated by electron microscopies and Raman spectroscopy.The presence of C-N functional groups was analyzed by Fourier transform infrared and synchrotron X-ray photoemission spectroscopy,while the particle and the specific capacitance were measured by particle sizer and cyclic voltammetry.The highest specific capacitance of 72.78 F/g is achieved by the sample with 20%urea,having the smallest particles size and the largest surface area.The corresponding sample has shown to be constituted by the appropriate amount of C–N pyrrolic and pyridinic defects.

关键词： N-doped rGO−like carbon coconut shell specific capacitance

Effect of microstructure on specific capacitance of AA3003 aluminum alloy foils

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2003年第5期13卷 1030-1034页

作者：张新明靳丽肖亚庆蹇雄 Changsha 410083 China College of Materials Science and Engineering Central South University

By means of OM, EDS, SEM and TEM, the effect of microstructures of AA3003 aluminum alloy foils on specific capacitance was investigated . The results show that the specific capacitance of the cathode aluminum foils depends on the microstructures of the foils, including intermetallic compound (Mn,Fe)Al 6 and Al matrix, tangled dislocations in the regions adjacent to the intermetallic particles, and smaller and dispersed particles. Because the dislocation interaction with larger particles gives rise to high local lattice curvature in the matrix, which can be preferentially dissolved when etched, which results in serious remnant metal powders on the foil surface. Solid solution at 630 ℃, quenching in water and aging at 60 ℃ may increase the number of the second phase particles, and reduce the large particles, so that the capacitance of the cathode foils becomes higher and almost no powders remain on the surface of the foil. By means of aging after quenching, the precipitated particles and etch pit density in the foil increase obviously, therefore the favourable microstructures can be produced to improve the specific capacitance of the foils.

关键词： AA3003 aluminum alloy cathode foil microstructure specific capacitance

Perspective on ultrathin layered Ni-doped MoS_(2) hybrid nanostructures for the enhancement of electrochemical properties in supercapacitors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 335-349,I0008页

作者： Kamarajar Prakash Santhanakrishnan Harish Shanmugasundaram Kamalakannan Thirumalaisamy Logu Masaru Shimomura Jayaram Archana Mani Navaneethan Functional Materials and Energy Devices Laboratory Department of Physics and NanotechnologySRM Institute of Science and TechnologyKattankulathurChennai 603203Tamil NaduIndia Graduate School of Science and Technology Shizuoka University3-5-1 JohokuNaka-KuHamamatsuShizuoka 432-11Japan specific Materials Research CentreFaculty of Science and EngineeringSwansea UniversitySwanseaUnited Kingdom Nanotechnology Research Center SRM Institute of Science and TechnologyKattankulathurChennai 603203Tamil NaduIndia

Over the last two decades,extensive study has been done on two-dimensional Molybdenum Sulphide(MoS_(2))due to its outstanding features in energy storage applications.Although MoS_(2)has a lot of active sulphur edges,the presence of inactive surfaces leads to limit conductivity and efficiency.Hence,in this article,we aimed to promote the additional active sites by doping various weight percentages(2%,4%,6%,8%and 10%)of Nickel(Ni)into the MoS_(2)matrix by simple hydrothermal technique,and their doping effects were investigated with the help of Physio-chemical analyses.X-ray diffraction(XRD)pattern,Raman,and chemical composition(XPS)analyses were used to confirm the Ni incorporation in MoS_(2)nanosheets.Microscopic investigations demonstrated that Ni-doped MoS_(2)nanosheets were vertically aligned with enhanced interlayer spacing.Cyclic voltammetry,Galvanostatic charge-discharge,and electrochemical impedance spectroscopy investigations were used to characterize the electrochemical characteristics.The 6%Ni-doped MoS_(2)electrode material showed better CSPof 528.7 F/g@1 A/g and excellent electrochemical stability(85%of capacitance retention after 10,000 cycles at 5 A/g)compared to other electrode materials.Furthermore,the solid-state asymmetric supercapacitor was assembled using Nidoped MoS_(2)and graphite as anode and cathode materials and analysed the electrochemical properties in the two-electrode system.To determine the impact of the Ni-atom on the MoS_(2)surface,firstprinciples computations were performed.Further,it was examined for electronic band structure,the projected density of states(PDOS)and Bader charge transfer analyses.

关键词： Ni-doped MoS_(2) Supercapacitor Cyclic voltammetry Specilic surface area specific capacitance Stability

Co_(3)O_(4)@NiMoO_(4)composite electrode materials for flexible hybrid capacitors

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2022年第2期15卷 159-167页

作者： Yongli Tong Tengxi Zhang Yuchen Sun Xiaowei Wang Xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Science Shenyang Ligong UniversityShenyang 110159China

Co_(3)O_(4)nanomaterials as electrodes have been studied widely in the past decade due to their unique structural characteristics.However,their performance does not yet reach the level required for practical applications.It is,nevertheless,an effective strategy to synthesize hybrid electrode materials with high energy density.Herein we prepare Co_(3)O_(4)@NiMoO_(4)nanowires by a two-step hydrothermal method.The as-obtained sample can be directly used as cathode material of supercapacitors;with specific capacitance of 600 C/g at 1 A/g.An assembled capacitor delivers an energy density of 36.1 Wh/kg at 2700 W/kg,and retains 98.2%of the initial capacity after 8000 cycles.

关键词： Supercapacitor Co_(3)O_(4)@NiMoO_(4)nanowires specific capacitance Energy density

AC Line Filter Electrochemical Capacitors:Materials,Morphology,and Configuration

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第4期5卷 1060-1083页

作者： Haichao Tang Yang Tian Zhongshuai Wu Yujia Zeng Yang Wang Yang Hou Zhizhen Ye Jianguo Lu State Key Laboratory of Silicon Materials Key Laboratory for Biomedical Engineering of Ministry of EducationSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325036China

Recently,more and more supercapacitors(SCs)have been developed as AC line filter capacitors,which are generally named AC line filter electrochemical capacitors(FECs).Compared to traditional bulky aluminum electrolytic capacitors(AECs),FECs have higher capacity and lower space occupancy,which makes them a strong competitor.However,different from the common SCs for energy storage,it is necessary to consider the frequency response of the SCs for AC line filtering,where the contradiction between frequency response and specific capacitance is a challenge.The researchers have proposed different solutions from the perspective of materials,morphology,and configuration for this challenge.Based on the above background,in this review,we briefly introduce the principle and parameters of AC line filter electrochemical capacitors.We systematically summarize the state-of-the-art progresses of FECs and discuss their possible application and development in the future.The development of FECs can greatly promote the planarization,integration,and miniaturization of filter capacitors,and provide a new solution for the utilization of green and unstable energy.

关键词： AC line filtering fast response filter electrochemical capacitors specific capacitance supercapacitors

Moiré-superlattice MXenes enabled ultra-stable K-ion storage in neutral electrolyte

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5006-5017页

作者： Qiong Wu Yanhui Xue Shaofei Chao Fufa Wu Muhammad Sufyan Javed Lu Li Wei Zhang School of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China Key Laboratory of Automobile Materials MOE School of Materials Science&EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China

Ti_(3)C_(2)MXene is an auspicious energy storage material due to its metallic conductivity and layered assembly.However,in the real working condition of electrochemical energy storage with long cycle charging-discharging,a structural collapse is usually caused by the stacking of its layers creating a large attenuation of specific capacitance.Inspired by the superlattice effect of magic angle graphene,we conducted microscopical regulation of rotation mismatch on the Ti_(3)C_(2)lattice;consequently,a hexagonal fewlayered Ti_(3)C_(2)free-standing film constructed with Moiré-superlattices.Such finding not only solves the problem of Ti_(3)C_(2)structural collapse but also dramatically improves the specific capacitance of Ti_(3)C_(2)as a supercapacitor electrode under long cycle charging and discharging.The ultra-stable energy storage of this electrode material in a neutral aqueous electrolyte was realized.Moreover,the formation mechanism of rotating Moirépattern is revealed through microscopy and microanalysis of the produced Moirépattern,assisted with modeling and analyzing the underlying mechanism between the Moirépattern and the rotation angle.Our work provides experimental and theoretical support for future construction of Moiré-superlattice structure for a wide range of MXene phases and is undoubtedly promoting the development of MXene materials in the field of energy storage.

关键词： Ti_(3)C_(2)MXene Moiré-superlattice microwave-assisted etching specific capacitance

MnO_(2)/carbon nanocomposite based on silkworm excrement for high-performance supercapacitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1735-1744页

作者： Pian Zhang Yun-hao Wu Hao-ran Sun Jia-qi Zhao Zhi-ming Cheng Xiao-hong Kang Department of Chemistry School of ScienceBeijing Jiaotong UniversityBeijing 100044China

MnO_(2)/biomass carbon nanocomposite was synthesized by a facile hydrothermal reaction.Silkworm excrement acted as a carbon precursor,which was activated by ZnCl_(2) and FeCl_(3) combining chemical agents under Ar atmosphere.Thin and flower-like MnO_(2) nanowires were in-situ anchored on the surface of the biomass carbon.The biomass carbon not only offered high conductivity and good structural stability but also relieved the large volume expansion during the charge/discharge process.The obtained MnO_(2)/biomass carbon nanocomposite electrode exhibited a high specific capacitance(238 F·g^(-1) at 0.5 A·g^(-1))and a superior cycling stability with only 7% degradation after 2000 cycles.The observed good electrochemical performance is accredited to the materials’high specific surface area,multilevel hierarchical structure,and good conductivity.This study proposes a promising method that utilizes biological waste and broadens MnO_(2)-based electrode material application for next-generation energy storage and conversion devices.

关键词： manganese dioxide specific capacitance cyclic stability biomass carbon silkworm excrement

Characterization of Microporous Activated Carbon Electrodes for Electric Double-layer Capacitors

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第5期20卷 627-630页

作者： MENGQing-han LIULing SONGHuai-he KeyLaboratoryofScienceandTechnologyofControllableChemicalReactionsBUCT MinistryofEducationBeijingUniversityofChemicalTechnologyBeijing100029P.R.China

Activated carbons(ACs) with a wide range of surface areas were made from petroleum coke by means of KOH activation. The electrochemical characterization was carried out for several activated carbons used as polarizable electrodes of electric double-layer capacitors(EDLCs) in an aqueous electrolytic solution. The porous structures and electrochemical double-layer capacitance of the activated carbons were investigated by virtue of nitrogen gas adsorption and constant current cycling(CCC) methods. The relationship among the surface area, pore volume of the activated carbons and specific double-layer capacitance was discussed. It was found that the specific capacitance of ACs increased linearly with the increase of surface area. The presence of mesopores in the activated carbons with very high surface area(>2000 m\+2/g) was not very effective for them to be used as EDLCs. The influence of chemical characteristics of the activated carbons on the double layer formation could be considered to be negligible.

关键词： Micropore activated carbon Electric double layer capacitor specific capacitance

Synthesis and Characterization of Magnetite/Carbon Nanocomposite Thin Films for Electrochemical Applications

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第10期27卷 873-878页

作者： Suh Cem Pang Wai Hwa Khoh Suk Fun Chin Department of Chemistry Faculty of Resource Science and TechnologyUniversiti Malaysia Sarawak

Stable colloidal suspension of magnetite/starch nanocomposite was prepared by a facile and aqueous-based chemical precipitation method, Magnetite/carbon nanocomposite thin films were subsequently formed upon carbonization of the starch component by heat treatment under controlled conditions. The initial content of native sago starch as the carbon source was found to affect the microstructure and electrochemical properties of the resulted magnetite/carbon nanocomposite thin films, A specific capacitance of 124 F/g was achieved for the magnetite/carbon nanocomposite thin films as compared to that of 82 F/g for pure magnetite thin films in Na2SO4 aqueous electrolyte.

关键词： Magnetite Magnetite/carbon nanocomposite Native sago starch specific capacitance