检索结果-南通市图书馆

Nano Research 2016年第8期9卷 2260-2269页

作者： Shichao Du Zhiyu Ren Jun Wu Wang Xi Honggang Fu Institute of Theoretical chemistry Jilin University ChangChun 130023 China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

Highly sensitive, selective, and stable hydrogen peroxide （H2O2） detection using nanozyme-based catalysts are desirable for practical applications. Herein, vertical α-FeOOH nanowires were successfully grown on the surface of carbon fiber paper （CFP） via a low-temperature hydrothermal procedure. The formation of vertical α-FeOOH nanowires is ascribed to the structure-directing role of sodium dodecyl sulfate. The resulting free-standing electrode with one-dimensional （1D） nanowires offers oriented channels for fast charge transfer, excellent electrical contact between the electrocatalyst and the current collector, and good mechanical stability and reproducibility. Thus, it can serve as an efficient electrocatalyst for the reduction and sensitive detection of H2O2. The relation of the oxidation current of H202 with the concentration is linear from 0.05 to 0.5 mM with a sensitivity of -0.194 mA/（***2） and a low detection limit of 18μM. Furthermore, the portability in the geometric tailor and easy device fabrication allow extending the general applicability of this free-standing electrode to chemical and biological sensors.

关键词： α-FeOOH nanowires free-standing electrode synergistic effect electrocatalysis H2O2 detection

Thick free-standing electrode based on carbon-carbon nitride microspheres with large mesopores for high-energy-density lithium-sulfur batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2021年第3期3卷 410-423页

作者： Hui-Ju Kang Tae-Gyu Lee Heejin Kim Jae-Woo Park Hyun Jin Hwang Hyeonseok Hwang Kwang-Suk Jang Hae Jin Kim Yun Suk Huh Won Bin Im Young-Si Jun Department of Advanced Chemicals&Engineering Chonnam National UniversityBuk-guGwangjuRepublic of Korea Division of Analytical Science Korea Basic Science Institute(KBSI)Yuseong-guDaejeonRepublic of Korea School of Chemical Engineering Chonnam National UniversityBuk-guGwangjuRepublic of Korea Department of Applied Chemistry Hanyang UniversityAnsanGyeonggi-doRepublic of Korea Department of Biological Engineering Inha UniversityNam-guIncheonRepublic of Korea Division of Materials Science and Engineering Hanyang UniversitySeongdong-guSeoulRepublic of Korea

The development of sulfur cathodes with high areal capacity and high energy density is crucial for the practical application of lithium-sulfur batteries(LSBs).LSBs can be built by employing(ultra)high-loading sulfur cathodes,which have rarely been realized due to massive passivation and ***,microspheres of a carbon-carbon nitride composite(C@CN)with large mesopores are fabricated via molecular cooperative *** the C@CN-based electrodes,the effects of the large mesopores and N-functional groups on the electrochemical behavior of sulfur in LSB cells are thoroughly investigated under ultrahigh sulfur-loading conditions(>15 mgS cm^(-2)).Furthermore,for high-energy-density LSBs,the C@CN powders are pelletized into a thick free-standing electrode(thickness:500^m;diameter:11 mm)via a simple briquette process;here,the total amount of energy stored by the LSB cells is 39 mWh,corresponding to a volumetric energy density of 440 Wh L-1 with an areal capacity of 24.9 and 17.5 mAh cm^(-2) at 0.47 and 4.7 mA cm^(-2),respectively(at 24mgS cm^(-2)).These results have significantly surpassed most recent records due to the synergy among the large mesopores,(poly)sulfide-philic surfaces,and thick *** developed strategy with its potential for scale-up successfully fills the gap between laboratory-scale cells and practical cells without sacrificing the high areal capacity and high energy density,providing a solid foundation for the development of practical LSBs.

关键词： briquette process carbon nitride free-standing electrode high energy density lithium-sulfur batteries mesopores

free-standing α-MoO_(3)/Ti_(3)C_(2) MXene Hybrid electrode in Water-in-Salt Electrolytes

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 2023年第4期6卷 6-14页

作者： Mohit Saraf Christopher E.Shuck Nazgol Norouzi Kyle Matthews Alex Inman Teng Zhang Ekaterina Pomerantseva Yury Gogotsi A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphia PA 19104USA

While transition-metal oxides such as α-MoO_(3)provide high capacity,their use is limited by modest electronic conductivity and electrochemical instability in aqueous ***-dimensional(2D)MXenes,offer metallic conductivity,but their capacitance is limited in aqueous *** of partially solvated cations into Ti_(3)C_(2)MXene from lithium-based water-in-salt(WIS)electrolytes enables charge storage at positive potentials,allowing a wider potential window and higher ***,we demonstrate that α-MoO_(3)/Ti_(3)C_(2)hybrids combine the high capacity of α-MoO_(3)and conductivity of Ti_(3)C_(2)in WIS(19.8 m LiCI)electrolyte in a wide1.8 V voltage *** voltammograms reveal multiple redox peaks from α-MoO_(3)in addition to the well-separated peaks of Ti_(3)C_(2)in the hybrid *** leads to a higher specific charge and a higher rate capability compared to a carbon and binder containing α-MoO_(3)*** results demonstrate that the addition of MXene to less conductive oxides eliminates the need for conductive carbon additives and binders,leads to a larger amount of charge stored,and increases redox capacity at higher *** addition,MXene encapsulated α-MoO_(3)showed improved electrochemical stability,which was attributed to the suppressed dissolution of α-MoO_(3).The work suggests that oxide/MXene hybrids are promising for energy storage.

关键词： free-standing electrode Ti_(3)C_(2)MXene water-in-salt electrolytes α-MoO_(3)nanobelts

An in-situ self-etching enabled high-power electrode for aqueous zinc-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第1期88卷 399-408,I0009页

作者： Shuang Hou Dingtao Ma Yanyi Wang Kefeng Ouyang Sicheng Shen Hongwei Mi Lingzhi Zhao Peixin Zhang College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials School of Semiconductor Science and TechnologySouth China Normal UniversityFoshan 528225GuangdongChina SCNU Qingyuan Institute of Science and Technology Innovation Co. Ltd.Qingyuan 511517GuangdongChina

Sluggish storage kinetics is considered as the main bottleneck of cathode materials for fast-charging aqueous zinc-ion batteries(AZIBs).In this report,we propose a novel in-situ self-etching strategy to unlock the Palm tree-like vanadium oxide/carbon nanofiber membrane(P-VO/C)as a robust freestanding *** investigations including the finite element simulation,in-situ X-ray diffraction,and in-situ electrochemical impedance spectroscopy disclosed it an electrochemically induced phase transformation mechanism from VO to layered Zn_(x)V_(2)O_5·nH_(2)O,as well as superior storage kinetics with ultrahigh pseudocapacitive *** demonstrated,such electrode can remain a specific capacity of 285 mA h g^(-1)after 100 cycles at 1 A g^(-1),144.4 mA h g^(-1)after 1500 cycles at 30 A g^(-1),and even 97 mA h g^(-1)after 3000 cycles at 60 A g^(-1),***,an impressive power density of 78.9 kW kg^(-1)at the super-high current density of 100 A g^(-1)also can be *** design concept of in-situ self-etching free-standing electrode can provide a brand-new insight into extending the pseudocapacitive storage limit,so as to promote the development of high-power energy storage devices including but not limited to AZIBs.

关键词： In-situ self-etching free-standing electrode Pseudocapacitive storage High-power Zinc-ion batteries

free-standing porous carbon electrodes derived from wood for high-performance Li-O2 battery applications

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第12期10卷 4318-4326页

作者： Jingru Luo Xiahui Yao Lei Yang Yang Han Liao Chen Xiumei Geng Vivek Vattipalli Qi Dong Wei Fan Dunwei Wang Hongli Zhu Department of Chemistry Merkert Chemistry Center Boston College 2609 Beacon St. Chestnut Hill MA 02467 USA Department of Mechanical and Industrial Engineering Northeastern University 360 Huntington Avenue Boston MA 02115 USA Chemical Engineering Department University of Massachusetts Amherst 686 N. Pleasant Street Amherst MA 01003 USA

Porous carbon materials are widely used in particulate forms for energy applications such as fuel cells, batteries, and （super） capacitors. To better hold the particles together, polymeric additives are utilized as binders, which not only increase the weight and volume of the devices, but also cause adverse side effects. We developed a wood-derived, free-standing porous carbon electrode and successfully applied it as a cathode in Li-O2 batteries. The spontaneously formed hierarchical porous structure exhibits good performance in facilitating the mass transport and hosting the discharge products of Li202. Heteroatom （N） doping further improves the catalytic activity of the carbon cathode with lower overpotential and higher capacity. Overall, the Li-O2 battery based on the new carbon cathode affords a stable energy efficiency of 65% and can be operated for 20 cycles at a discharge depth of 70%. The wood-derived free-standing carbon represents a new, unique structure for energy applications.

关键词： bio-inspired free-standing electrode porous carbon lithium oxygen batteries

Hierarchical Ni-Co-S@Ni-W-O core-shell nanosheet arrays on nickel foam for high-performance asymmetric supercapacitors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第3期11卷 1415-1425页

作者： Weidong He Zhifu Liang Keyu ji Qingfeng Sun Tianyou Zhai Xijin Xu School of Physics and Technology University of Jinan 336 West Road of Nan Xinzhuang Jinan 250022 China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China School of Engineering Zhejiang A & F University Hangzhou 311300 China

Nickel cobalt sulfides （Ni-Co-S） have attracted extensive attention for application in electronic devices owing to their excellent conductivity and high electrochemical capacitance. To facilitate the large-scale practical application of Ni-Co-S, the excellent rate capability and cyclic stability of these compounds must be fully exploited. Thus, hierarchical Ni-Co-S@Ni-W-O （Ni-Co-S-W） core/shell hybrid nanosheet arrays on nickel foam were designed and synthesized herein via a facile three-step hydrothermal method, followed by annealing in a tubular furnace under argon atmosphere. The hybrid structure was directly assembled as a free-standing electrode, which exhibited a high specific capacitance of 1,988 F·g^-1 at 2 A·g^-1 and retained an excellent capacitance of approximately 1,500 F·g^-1 at 30 A·g^-1, which is superior to the performance of the pristine Ni-Co-S nanosheet electrode. The assembled asymmetric supercapacitors achieved high specific capacitance （155 F·g^-1 at 1 A·g^-1）, electrochemical stability, and a high energy density of 55.1 W·h·kg^-1 at a power density of 799.8 W·kg^-1 with the optimized Ni-Co-S-W core/shell nanosheets as the positive electrode, activated carbon as the negative electrode, and 6 M KOH as the electrolyte.

关键词： core/shell structure free-standing electrode supercapacitors high energy density excellent stability

Bulk preparation of free-standing single-iron-atom catalysts directly as the air electrodes for high-performance zinc-air batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2023年第5期5卷 57-66页

作者： Hong-Bo Zhang Yu Meng Hong Zhong Lili Zhang Shichao Ding Lingzhe Fang Tao Li Yi Mei Peng-Xiang Hou Chang Liu Scott P.Beckman Yuehe Lin Hui-Ming Cheng Jin-Cheng Li Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Faculty of Chemical EngineeringKunming University of Science and TechnologyKunmingChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangChina School of Mechanical and Materials Engineering Washington State UniversityPullmanWashingtonUSA Department of Chemistry and Biochemistry Northern Illinois UniversityDeKalbIllinoisUSA Argonne National Laboratory X-Ray Science DivisionLemontIllinoisUSA

The keen interest in fuel cells and metal-air batteries stimulates a great deal of research on the development of a cost-efficient and high-performance catalyst as an alternative to traditional Pt to boost the sluggish oxygen reduction reaction(ORR)at the ***,we report a facile and scalable strategy for the large-scale preparation of a free-standing and flexible porous atomically dispersed Fe-N-doped carbon microtube(FeSAC/PCMT)*** from its unique structure that greatly facilitates the catalytic kinetics,mass transport,and electron transfer,our FeSAC/PCMT electrode exhibits excellent performance with an ORR potential of 0.942 V at^(-3) mA cm^(-2).When the FeSAC/PCMT sponge was directly used as an oxygen electrode for liquid-state and flexible solid-state zinc-air batteries,high peak power densities of 183.1 and 58.0 mW cm^(-2) were respectively achieved,better than its powdery counterpart and commercial Pt/C *** and theoretical investigation results demonstrate that such ultrahigh ORR performance can be attributed to atomically dispersed Fe-N_(5) species in FeSAC/*** study presents a cost-effective and scalable strategy for the fabrication of highly efficient and flexible oxygen electrodes,provides a significant new insight into the catalytic mechanisms,and helps to realize significant advances in energy devices.

关键词： atomic Fe-N_(5)species free-standing electrode large-scale preparation oxygen reduction reaction zinc-air battery

free-standing vanadium pentoxide nanoribbon film as a high-performance cathode for rechargeable sodium batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第12期28卷 2251-2253页

作者： Yi Sun Xin Liang Hongfa Xiang Yan YU Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices School of Materials Science and Engineering Hefei University of TechnologyHefei 230009 China Key Laboratory of Materials for Energy Conversion Chinese Academy of Sciences Department of Materials Science and Engineering University of Scienceand Technology of China Hefei 230026 China

Vanadium pentoxide （***2O） nanoribbons are synthesized via a hydrothermal process. These ribbons are 20nm thick, 200nm to 1 μm wide and several tens of micrometers long. free-standing binder-free films are prepared by using these nanoribbons with multi-walled carbon nanotubes （MWCNTs） and used as the cathode for rechargeable sodium batteries. The large interlayer space between the V20s5 bilayers can enhance the kinetics of sodium ion intercalation/deintercalation. In addition, the intertwining network of the V2O5. 0.34H2O film provides efficient electron conduction pathways and shortens diffusion distances of sodium ion. The electrochemical tests prove that the free- standing V2O5. 0.34H2O film cathode delivers high reversible specific capacities （190 mAh/g） and good cycling stabilities （170 mAh/g after 150 cycles） in the voltage range between 1.5V and 3.5V.

关键词： Vanadium pentoxide Cathode free-standing electrode Rechargeable sodium batteries

Binder-free electrodes for advanced potassium-ion batteries:A review

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1299-1308页

作者： Wencong Liu Wenyi Liu Yuqi Jiang Qiuyue Gui Deliang Ba Yuanyuan Li Jinping Liu School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal University.Harbin 150025China

Potassium-ion batteries(PIBs)have attracted enormous attention due to the abundance of potassium resources,low cost,fast ionic conductivity of electrolyte and relatively high operating *** great effo rts and progress,researches on PIBs are still at the initial stage,especially in the emerging field of flexible and wearable *** inevitable challenges for PIBs include low reversible capacity,unsatisfactory cycling stability and insufficient energy density,the solution to which mostly relies on designing adva nced ***-free electrodes have emerged as promising electrode architecture for *** electrodes avoid the use of insulating binders,which can be designed with various synergistic functional materials to address the aforementioned PIB issues and be endowed with flexibility/*** this review,we mainly summarize the recent progress on binde r-free electrodes for PIBs,with the focus on the methodologies,detailed strategies and functional materials for electrode *** strategy for binder-free electrodes is to assemble free-standing architecture with the help of carbon nanotubes(CNTs),graphitic fibers,and other carbon or mechanically robust materials,either alone or in *** other effective strategy is current collector substrate-assisted direct growth,including the use of carbon cloth,*** and other conductive ***,challenges and research opportunities are put forward at the end as the guidance for future development of binder-free PIB devices.

关键词： Binder-free free-standing electrode Substrate-assisted directly grown electrode Potassium-ion battery Flexible device