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Electrospun CoSe@N-doped carbon nanofibers with highly capacitive Li storage

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Journal of Energy Chemistry 2019年第6期28卷 160-166页

作者： Jiandong Liu Jiaojiao Liang Caiyun Wang jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia College of Traffic Engineering Hunan University of TechnologyZhuzhou 412001、HunanChina

One-dimensional nano-structured materials have attracted attention due to its unique properties afforded such as the across-linked structures and large aspect *** this work,one-dimensional CoSe@N-doped carbon nanofibers(CoSe@NCNFs)are successfully by combining the techniques of electrospinning and *** powder are directly dispersed in the polyacrylonitrile/N,N-Dimethylformamide(DMF)solution containing cobalt salt to form the *** performance of these materials was investigated in Li-ion batteries after the annealing at different *** Co Se@NC nanofibers annealed at 550℃(CoSe@NC-550)and displayed excellent storage properties,affording a high capacity of 796 m Ah·g-1at a current density of 1 A·g^-1 for 100 ***,it is confirmed that the pseudocapacitive contribution of CoSe@NC-550 is up to 72.8%at the scan rate of 1 mV/s through the cyclic voltammetry analysis.

关键词： CoSe Anode Nanofibers Electrospinning Li-ion batteries

Twice Q-polynomial distance-regular graphs of diameter 4

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Science China mathematics 2015年第12期58卷 2683-2690页

作者： ma jianmin KOOLEN Jack H. College of mathematics & Information Science and Hebei Key Lab of Computational mathematics & Applications Hebei Normal University School of mathematical Sciences University of Science and Technology of China

It is known that a distance-regular graph with valency k at least three admits at most two Qpolynomial structures. We show that all distance-regular graphs with diameter four and valency at least three admitting two Q-polynomial structures are either dual bipartite or almost dual bipartite. By the work of Dickie(1995) this implies that any distance-regular graph with diameter d at least four and valency at least three admitting two Q-polynomial structures is, provided it is not a Hadamard graph, either the cube H(d, 2)with d even, the half cube 1/2H(2d + 1, 2), the folded cube?H(2d + 1, 2), or the dual polar graph on [2A2d-1(q)]with q 2 a prime power.

关键词： distance-regular graph P-or Q-polynomial structure tight

Lithium Hexamethyldisilazide Endows Li||NCM811 Battery with Superior Performance

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Nano-Micro Letters 2023年第3期15卷 32-34页

作者： Junda Huang Yaxiong Yang Yanxia Liu jianmin ma School of Chemistry Tiangong UniversityTianjin 300387People’s Republic of China School of Physics and Electronics Hunan UniversityChangsha 410082People’s Republic of China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021People’s Republic of China

The construction of stable cathode electrolyte interphase(CEI)is the key to improve the NCM811 particle structure and interfacial stability via electrolyte *** He’s work,lithium hexamethyldisilazide(LiHMDS)as the electrolyte additive is proposed to facilitate the generation of stable CEI on NCM811 cathode surface and eliminate H_(2)O and HF in the electrolyte at the same time,which boosts the cycling performance of Li||NCM811 battery up to 1000 or 500 cycles with 4.5 V cut-off voltage at 25 or 60℃.

关键词： Lithium metal battery Electrolyte additive Cathode electrolyte interphase Lithium hexamethyldisilazide Cycling performance

Strain engineering the D-band center for Janus MoSSe edge: Nitrogen fixation

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Journal of Energy Chemistry 2019年第6期28卷 155-159页

作者： Xi Tang Zengxi Wei Quanhui Liu jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082 HunanChina Institute of Advanced Electrochemical Energy Xi'an University of TechnologyXi'an 710048 ShaanxiChina

Nitrogen fixation is one of the most important and challenging process in production of ammonia at ambient temperature. We have first performed density function theory to propose the edge of Janus MoSSe(EJM) monolayer as a potential catalyst for nitrogen reduction reaction. Our results show that the superficial D-band centers play an important role in nitrogen fixation. The strain effects greatly alter the D-band center, and further change the interaction between the adsorbates and the surface of *** findings provide a new thought into designing transition-metal chalcogenide catalysts for nitrogen fixation.

关键词： Nitrogenfixation Electrocatalysis Janus MoSSe Strain engineering Density function theory

Oleic acid-treated synthesis of MnO@C with superior electrochemical properties

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Journal of Energy Chemistry 2017年第3期26卷 340-345页

作者： Jing Guo Jiaojiao Liang Chunyu Cui jianmin ma Schcool of Physics and Electronics Hunan UniversityChangsha 410082HunanChina

MnO@C nanocomposites are synthesized by annealing MnO microspheres treated with oleic acid as carbon source. The obtained MnO@C nanocomposites exhibit a discharge capacity of 1075 m Ah/g for the initial cycle, and show the excellent cycling performance with a discharge capacity of 421 mah/g after100 cycles at a current density of 100 ma/g. The total specific capacity of MnO@C nanocomposites is higher than those of pure MnO microspheres in our experiments. Owing to the superior electrochemical behavior, the as-obtained MnO@C nanocomposites are potentially applied as next-generation anode material for lithium-ion batteries.

关键词： MnO Anode Lithium-ion battery Carbon coating Electrochemical properties

NASICON-Structured NaTi2（PO4）3 for Sustainable Energy Storage

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Nano-Micro Letters 2019年第3期11卷 119-154页

作者： Mingguang Wu Wei Ni Jin Hu jianmin ma School of Physics and Electronics Hunan UniversityChangsha410082People’s Republic of China Faculty of Technology University of Oulu90014OuluFinland Panzhihua University Panzhihua617000People’s Republic of China Key Laboratory of materials Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou450002People’s Republic of China

Several emerging energy storage technologies and systems have been demonstrated that feature low cost,high rate capability,and durability for potential use in large-scale grid and high-power *** to its outstanding ion conductivity,ultrafast Na-ion insertion kinetics,excellent structural stability,and large theoretical capacity,the sodium superionic conductor(NASICON)-structured insertion material NaTi2(PO4)3(NTP)has attracted considerable attention as the optimal electrode material for sodium-ion batteries(SIBs)and Na-ion hybrid capacitors(NHCs).On the basis of recent studies,NaTi2(PO4)3 has raised the rate capabilities,cycling stability,and mass loading of rechargeable SIBs and NHCs to commercially acceptable *** this comprehensive review,starting with the structures and electrochemical properties of NTP,we present recent progress in the application of NTP to SIBs,including non-aqueous batteries,aqueous batteries,aqueous batteries with desalination,and sodium-ion hybrid *** a thorough discussion of the unique NASICON structure of NTP,various strategies for improving the performance of NTP electrode have been presented and summarized in ***,the major challenges and perspectives regarding the prospects for the use of NTP-based electrodes in energy storage systems have also been summarized to offer a guideline for further improving the performance of NTP-based electrodes.

关键词： NaTi2(PO4)3 Sodium superionic conductor Anode Batteries Hybrid capacitors

S-Doped Carbon-Coated FeS_(2)/C@C Nanorods for Potassium Storage

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 321-328页

作者： Xin Li Huaping Wang Wenchao Zhang Yuezhan Feng jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082China Institute for Superconducting and Electronic materials(ISEM) School of MechanicalMaterials.Mechatronics and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongWollongongNSW 2500Australia Key Laboratory of materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Potassium-ion batteries(PIBs) are promising scalable energy storage system;however,one of the challenges for its potential application is the huge volume variations during cycling due to the insertion/extraction of large size potassium ***,we fabricated the S-doped carbon-coated rod-like FeS2/C@C,which not only effectively alleviate the volume variations upon cycling but also can improve electrical conductivity and maintain the structural *** an anode material for PIBs,the rod-like FeS2/C@C electrodes delivered excellent rate performance(175 ma h g-1 at 0.5 A g-1) and stable cycle performance(262 ma h g-1 after 100 cycles at 0.1 A g-1).The superior excellent performance is associated with the unique structure of FeS2/C@*** as-synthesized FeS2/C@C is demonstrated to be a potential anode for PIBs.

关键词： Iron disulfide Carbon matrix Potassium-ion batteries Nanorods Volume variations

Erds-Ko-Rado theorems in certain semilattices

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Science China mathematics 2013年第11期56卷 2393-2407页

作者： GUO Jun ma jianmin WANG KaiShun College of mathematics and Information Science Langfang Teachers' College College of mathematics and Information Science Hebei Normal University LMCS School of Mathematical Science Beijing Normal University

Suda （2012） extended the ErdSs-Ko-Rado theorem to designs in strongly regularized semilattices. In this paper we generalize Suda＇s results in regularized semilattices and partition regularized semilattices, give ma... 详细信息

关键词： ErdSs-Ko-Rado theorem semilattice regularized semilattice strongly regularized semilattice partition regularized semilattice partition strongly regularized semilattice

Nitrogen doped porous carbon as excellent dual anodes for Li-and Na-ion batteries

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Chinese Chemical Letters 2020年第2期31卷 583-588页

作者： Zhanheng Yan Qin-Wen Yang Qinghong Wang jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China School of Chemistry and materials Science Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional MaterialsJiangsu Normal UniversityXuzhou 221116China Key Laboratory of materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Biomass-derived carbon materials have obtained great attention due to their sustainability,easy availability,low cost and environmentally *** this work,bamboo leaves derived nitrogen doped hierarchically porous carbon have been efficiently synthesized via an annealing approach,followed by an etching process in HF *** measurements demonstrate that the unique porous structure,together with the inherent high nitrogen content,endow the as-derived carbon with excellent lithium/sodium storage *** porous carbon annealed at 700℃presents outstanding rate capability and remarkable long-term stability as anodes for both lithium-ion batteries and sodium-ion *** optimized carbon delivers a high discharge capacity of 450 mah/g after 500 cycles at the current density of 0.2 A/g for LIBs,and a discharge capacity of 180 mah/g after 300 cycles at the current density of 0.1 A/g for SIBs.

关键词： Nitrogen doping Carbon Anode Lithium-ion batteries Sodium-ion batteries