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Free-standingβ-Ta_(2)O_(5)/SWCNTs composite film for high-rate Li-ion storage

Science China(Technological Sciences) 2024年第2期67卷 616-626页

作者： WU ZhiMin LIU JiaJia HE XingYu BIAN Jing ZHU XianJun CHEN JianMei LI JianMin College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing Universityof Posts and TelecommunicationsNanjing 210023China Department of Pathology College of Medicine University of CincinnatiCincinnatiOH 45267USA

The rapid development of portable and wearable electronic devices is responding to the urgent demand for high-efficiency flexible energy storage devices.Flexible supercapacitors,showing long cycle life,high power density,and good safety,are considered ideal candidates.Nevertheless,the relatively low energy density restricts their practical applications.With a large dielectric constant of 18-46,Ta_(2)O_(5)-based materials typically exhibit excellent electron-binding ability,which is critical for enhancing the energy density of supercapacitors.In this work,the free-standingβ-Ta_(2)O_(5)/single-walled carbon nanotubes(SWCNTs)composite film was prepared,with a highβ-Ta_(2)O_(5)loading of over 70%.By anchoringβ-Ta_(2)O_(5)nanoparticles onto the surface of SWCNTs,the system’s flexibility and conductivity were significantly enhanced,which also facilitated the intercalation electrodynamics of metal cations.As a result,the flexibleβ-Ta_(2)O_(5)/SWCNTs film exhibits excellent Li-ion storage performance,with a high volumetric specific capacitance of 392.3 F cm^(-3)at the scan rate of 10 mV s^(-1)and 198.9 F cm^(-3)at 500 mV s^(-1).In addition,the asymmetric device,assembled by theβ-Ta_(2)O_(5)/SWCNTs and activated carbon films,shows a high energy density of 45.5 Wh kg^(-1)at the power density of 10.8 kW kg^(-1).This technique opens up a new avenue for improving the energy density and rate performance of flexible supercapacitors.

关键词： pseudocapacitor Li-ion storage β-Ta_(2)O_(5)/SWCNTs film flexible device high-rate capability

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维普期刊数据库

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Effects of Reaction Temperature on Microstructure and Advanced pseudocapacitor Properties of NiO Prepared via Simple Precipitation Method

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Nano-Micro Letters 2013年第4期5卷 289-295页

作者： Qiangqiang Sun Shujuan Bao Institute for Clean Energy & Advanced Materials Southwest University

Morphology-controlled synthesis and large-scale self-assembly of nanoscale building blocks into complex nanoarchitectures is still a great challenge in nanoscience. In this work, various porous NiO nanostructures are obtained by a simple ammonia precipitation method and we find that the reaction temperature has a significant impact on their microstructures. Nanoflowers and nanoflakes have been obtained at 0 and50, while, weakly self-assembly nanoflowers with nanoflakes are formed at 20. In order to understand the process-structure-property relationship in nanomaterial synthesis and application, the as-prepared NiO is used as supercapacitor electrode materials, and evaluated by electrochemical measurement. The experimental results indicate that the material obtained at lower temperature has higher pseudocapacitance, the specific capacitance of 944, 889 and 410 F/g are reached for the materials prepared at 0, 20 and 50 and further calcined at 300, respectively. While the material obtained at higher temperature has excellent rate capacity. This offers us an opportunity searching for exciting new properties of NiO, and be useful for fabricating functional nanodevices.

关键词： Nickel oxide Temperature Morphology pseudocapacitor

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CNT/High Mass Loading MnO2/Graphene-Grafted Carbon Cloth Electrodes for High-Energy Asymmetric Supercapacitors

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Nano-Micro Letters 2019年第4期11卷 549-560页

作者： Lulu Lyu Kwang-dong Seong Jong Min Kim Wang Zhang Xuanzhen Jin Dae Kyom Kim Youngmoo Jeon Jeongmin Kang Yuanzhe Piao Graduate School of Convergence Science and Technology Seoul National UniversitySeoul 151-742Republic of Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuPeople’s Republic of China Advanced Institutes of Convergence Technology Suwon 443-270Republic of Korea

Flexible supercapacitor electrodes with high mass loading are crucial for obtaining favorable electrochemical performance but still challenging due to sluggish electron and ion transport.Herein,rationally designed CNT/MnO2/graphene-grafted carbon cloth electrodes are prepared by a“graft-deposit-coat”strategy.Due to the large surface area and good conductivity,graphene grafted on carbon cloth offers additional surface areas for the uniform deposition of MnO2(9.1 mg cm?2)and facilitates charge transfer.Meanwhile,the nanostructured MnO2 provides abundant electroactive sites and short ion transport distance,and CNT coated on MnO2 acts as interconnected conductive“highways”to accelerate the electron transport,significantly improving redox reaction kinetics.Benefiting from high mass loading of electroactive materials,favorable conductivity,and a porous structure,the electrode achieves large areal capacitances without compromising rate capability.The assembled asymmetric supercapacitor demonstrates a wide working voltage(2.2 V)and high energy density of 10.18 mWh cm?3.

关键词： High mass loading Flexible pseudocapacitor Voltage window Energy density

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Promising supercapacitor electrodes based immobilization of proteins onto macroporous Ni foam materials

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Journal of Energy Chemistry 2015年第1期24卷 31-38页

作者： Mohamed Khairy Sherif A.El-Safty National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukubalshi Ibaraki-ken 305-0047 Japan Chemistry Department Faculty of Science Sohag UniversityEgypt Graduate School for Advanced Science and Engineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan

Immobilizing biocomponents on solid surfaces is a critical step in the development of new devices for future biological, medical, and elec- tronic applications. Therefore, numerous integrated films were recently developed by immobilizing different proteins or enzymes on electrode surfaces. In this work, hemeproteins were safely immobilized onto macroporous nickel-based electrodes while maintaining their functionality. Such modified electrodes showed interesting pseudo-capacitive behavior. Among hemeproteins, hemoglobin （Hb） film has a higher electro- chemical performance and greater charge/discharge cycling stability than myoglobin （Mb） and cytochrome C （CytC）. The heme group in an alkaline medium could induce the formation of superoxides on the electrode surface. These capacitive features of hemeprotein-Ni electrode were related to strong binding sites between hemeproteins and porous Ni electrode, the accumulation of superoxide or radicals on the Ni sur- face, and facile electron transfer and electrolyte diffusion through the three-dimensional macroporous network. Thus, these new protein-based supercapacitors have potential use in free-standing platform technology for the development of implantable energy-storage devices.

关键词： whemeprotein nickel foam pseudocapacitor macroporous peroxide alkaline medium

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Advances in in-situ characterizations of electrode materials for better supercapacitors

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Journal of Energy Chemistry 2021年第3期30卷 242-253页

作者： Xiaoli Su Jianglin Ye Yanwu Zhu Hefei National Research Center for Physical Sciences at the Microscale &Department of Materials Science and Engineering&CAS Key Laboratory of Materials for Energy ConversionIf i-ChEMUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

In past decades,the performance of supercapacitors has been greatly improved by rationalizing the electrode materials at the nanoscale.However,there is still a lack of understanding on how the charges are efficiently stored in the electrodes or transported across the electrolyte/electrode interface.As it is very challenging to investigate the ion-involved physical and chemical processes with single experiment or computation,combining advanced analytic techniques with electrochemical measurements,i.e.,developing in-situ characterizations,have shown considerable prospect for the better understanding of behaviors of ions in electrodes for supercapacitors.Herein,we briefly review several typical in-situ techniques and the mechanisms these techniques reveal in charge storage mechanisms specifically in supercapacitors.Possible strategies for designing better electrode materials are also discussed.

关键词： Electric double layer capacitor pseudocapacitor In-situ technique Charge storage mechanism

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Achieving high yield of Ti3C2Tx MXene few-layer flakes with enhanced pseudocapacior performance by decreasing precursor size

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Chinese Chemical Letters 2020年第4期31卷 1039-1043页

作者： Jianguang Xu Jiale Zhu Chen Gong Zexin Guan Dan Yang Zhihan Shen Wei Yao Haijiang Wu School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang UniversityShaoyang 422000China

Ti3C2Tx,a most studied member of MXene family,shows promise as a candidate electrode for pseudocapacitor due to its electronic conductivity and hydrophilic surface.However,the unsatisfactory yield of Ti3C2Tx few-layer flakes significantly restricted it in real applications.Here,we proposed a simple solution to boost the yield of Ti3C2Tx few-layer flakes by decreasing precursor size.When using the small500 mesh Ti3AlC2 powders as raw material,high yield of 65%was successfully achieved.Moreover,the asreceived small flakes also exhibit an enhanced pseudocapacior performance owing to their excellent electrical conductivity,expanded inte rlayer space and more O content on the surface.This work not only sheds light on the cost effective mass production of Ti3C2Tx few-layer flakes,but also provides an efficient solution for the design of MXene electrodes with high pseudocapacior performance.

关键词： MXene Ti3C2Tx High yield pseudocapacitor Precursor size Flake size

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Shape Control,Crystalline Conversion and Pseudocapacitance Properties of Mn3O4:Effects of Yb3+Doping

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Chinese Journal of Structural Chemistry 2018年第9期37卷 1440-1445页

作者：尤俊华郭耀祖赵耀倪志远郭瑞 School of Materials Science and Engineering Shenyang University of Technology School of Materials Science and Engineering Northeastern University School of Resources and Materials Northeastern University at Qinhuangdao

We report a facile method for the synthesis of manganese oxide（Mn3O4） nanorods via the direct reaction of MnCl2 and H2 O2 by doping Yb3＋ ions at room temperature and air atmosphere. The Mn3O4：Yb3＋ samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cyclic voltammetry（CVs）, electrochemical impedance spectroscopy（EIS）, and charging-discharging test（CD）. The results show that trace Yb3＋ doping（6 at%） could effectively induce crystalline transformation of Mn3O4 from cubic system（space group Fd-3 m） to tetragonal system（space group I41/amd） and incite the morphology changing from irregular particles to uniform nanorods. When Yb3＋ doping amount is 3%, the capacitance of Mn3O4 reaches the maximum, 246 F/g, which is related to the morphology change and the corresponding decrease of impedance.

关键词： Mn3O4 Yb^3＋ shape control crystalline conversion pseudocapacitor

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One-pot hydrothermal fabrication of α-Fe_2O_3@C nanocomposites for electrochemical energy storage

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Journal of Energy Chemistry 2019年第1期28卷 1-8页

作者： Maiyong Zhu Jiarui Kan Jianmei Pan Wenjie Tong Qi Chen Jiacheng Wang Songjun Li Institute of Polymer Materials School of Materials Science & Engineering Jiangsu University Department of Materials Science & Engineering Jingjiang College of Jiangsu University

A facile hydrothermal method was developed for the preparation of Fe_2O_3@C nanocomposites using FeCl_3·6H_2O as iron source and glucose as carbon source under alkaline condition. The morphology and structure of the as-prepared product were identified by transmission electron microscopy(TEM), high resolution transmission electron microscopy(HRTEM), field-emission scanning electron microscopy(FESEM),X-ray diffraction(XRD), Raman spectroscopy, Fourier Transform infrared spectroscopy(FTIR), and thermogravimetric analysis(TGA). The as-prepare α-Fe_2O_3@C nanocomposites were employed for supercapacitor electrode material. The synergistic combination of carbon electrical double-layer capacitance and α-Fe_2O_3 pseudo-capacitance established such nanocomposites as versatile platform for high performance supercapacitors. The synthesis method developed here is expected to obtain other metal oxide/carbon composite.

关键词： α-Fe2O3 Carbon Hydrothermal pseudocapacitor

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Nickel Oxide as an Electrode Material for Supercapacitors

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Journal of Materials Science & Technology 2002年第4期18卷 383-384页

作者： KuiLIANG AiCHEN 等 DepartmentofMaterialScienceandEngineering SichuanUniversityofScienceandTechnologyChengdu610039China InstituteofMicroelectronicsandSolid-stateElectronics UniversityofElectronicSci

The preparation of Ni oxide films and their capacitive mechanism are discussed in this paper. Nickel oxide film electrodes perform pseudocapacitance in aqueous KOH and NaOH but perform double layer capacitance in LiClO4/PC (propylence carbonate). The effect of increasing the specific capacitance was observed when Ni oxide film electrodes are doped with Co. A specific capacitance of around 70 F/g was achieved when using Ni oxide films doped with Co as electrodes and 1 mol/L aqueous KOH or NaOH as an electrolyte.

关键词： Supercapacitor pseudocapacitor Nickel oxide Doped Co

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High-Power and High-Energy-Density Flexible pseudocapacitor Electrodes Made from Porous CuO Nanobelts and SWCNTs

High-Power and High-Energy-Density Flexible Pseudocapacitor ...

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2011中国材料研讨会

作者： Huey Hoon Hng School of Materials Science and Engieering Nanyang Technological University School of Materials Science and Engineering Nanyang Technological University

We reported that flexible peudocapacitor electrodes with high energy density and high power density could be made from porous CuO nanobelts using single wall carbon nanotubes （SWCNTs） pellets as the current collectors.The porous CuO nanobelts were synthesized by a one-step hydrothermal process.These porous CuO nanobelts showed large surface area （128 m 2 /g） and were polycrystalline with extremely small crystal grains （e.g.3-5 nm）.This led to their high capacitances and stable cycling performances when tested as pseudocapacitor electrodes in the organic electrolyte （1.0 M LiPF 6 in 1:1 w/w ethylene carbonate/diethyl carbonate）,e.g.128 F/g after 1000 cycles at a current density of 1 A/g in the potential range of 0 to 2.5 V vs.SCE.At different current densities,series of high energy densities,e.g.130.2 W h/kg,92 W h/kg,44 W h/kg,25 kWh/kg and 20.8 W h/kg,were obtained for different power densities,e.g.1.25 kW/kg,6.25 kW/kg,25 kWh/kg and 50 kWh/kg,respectively.CuO/SWCNTs flexible hybrid electrodes were made from these porous CuO nanobelts using the SWCNTs pellets as the current collectors.These flexible electrodes showed lower average specific capacitances when we included the total mass of the CuO nanobelts and SWCNTs current collectors.However,the average specific capacitances of the CuO/SWNCNTs flexible electrodes were still much higher than that of electrodes made of pure SWCNTs.For example,we obtained effective specific capacitances of ＞62 F/g for the hybrid electrodes after 1000 cycles in the above-mentioned organic electrolyte at a current density of 5 A/g in the potential range of 0 to 2.5 V vs.SCE while the electrodes made of pure SWCNTs showed specific capacitance of only 23.6 F/g under the same testing conditions

关键词： CuO porous nanobelt pseudocapacitor

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