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Fast and highly reversible Na^(+)intercalation/extraction in Zn/Mg dual-doped P2-Na_(0.67)MnO_(2)cathode material for high-performance Na-ion batteries

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Nano Research 2021年第10期14卷 3531-3537页

作者： Xiaoqin Huang Deli Li Haijian Huang Xiao Jiang zeheng yang Weixin Zhang School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical Engineering Hefei 230009China

P2-type layered Na_(0.67)MnO_(2)has been considered to be a promising candidate cathode material for sodium ion ***,the undesired phase transitions during operation and the large Na^(+)radius induced sluggish ion diffusion remain the stumbling blocks to realize its high ***,we propose a Zn/Mg co-doping strategy,which is proved to have bifunctional ***,relative to the pristine P2-Na_(0.67)MnO_(2)and the single-ion(Zn/Mg)doped samples,the Zn/Mg dual-doped P2-Na_(0.67)MnO_(2)demonstrates a lower Mn^(3+)/Mn^(4+)ratio and a higher lattice O content,which facilitate the structural stability of the cathode *** intriguingly,the Zn/Mg co-doping gives rise to enlarged interplanar spacing,which provides spacious ion diffusion channels for fast Na^(+)intercalation/*** a result,the Zn/Mg dual-doped sample exhibits a high Na^(+)diffusion coefficient and a solid-solution reaction during charge/discharge,with a cell volume change determined to be only 0.55%.Taking advantages of the above favorable features,the Zn/Mg dual-doped P2-Na_(0.67)MnO_(2)demonstrates a high rate performance with 67.2 mAh·g^(-1)delivered at 10 C and a decent cycling stability with a capacity retention of 93.8%achieved at 1 C after 100 *** work introduces the Zn/Mg co-doping strategy to simultaneously improve the cycling stability and rate capability of P2-Na_(0.67)MnO_(2),which may offer a promising avenue for further performance enhancement of the layered Na-ion batteries cathode materials.

关键词： Na-ion batteries cathode materials co-doping Na-ion diffusion structural stability

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基于提锂渣制备磷酸铁及其高值化利用研究

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电源技术 2024年第10期48卷 1867-1874页

作者：刘淳肖凡杨则恒高德堃蒋龙进张卫新合肥工业大学化学与化工学院安徽合肥230009 安徽超越环保科技股份有限公司安徽滁州239060

随着锂离子电池的广泛应用,废旧锂离子电池逐年增加,其回收和循环利用迫在眉睫。目前关于废旧锂离子电池LiFePO_(4)正极材料的回收主要是关注锂的提取回收,而对剩余的低附加值提锂渣的回收利用研究甚少。基于酸浸提锂渣,采用磷酸-硫酸... 详细信息

随着锂离子电池的广泛应用,废旧锂离子电池逐年增加,其回收和循环利用迫在眉睫。目前关于废旧锂离子电池LiFePO_(4)正极材料的回收主要是关注锂的提取回收,而对剩余的低附加值提锂渣的回收利用研究甚少。基于酸浸提锂渣,采用磷酸-硫酸混合酸浸回收制备磷酸铁,并探究其高值化利用途径。在最佳实验条件下,提锂渣中磷酸铁的浸出率达到99.69%,结晶产率达到97.14%,综合回收率达到96.83%。再生磷酸铁符合电池用磷酸铁标准,基于回收的磷酸铁制备的磷酸铁锂正极材料表现出良好的电化学性能,在0.1 C和5 C下,其放电比容量分别达到155.1和129.0 mAh/g,5 C下循环300次后,容量保持率为98.4%。该工作为提锂渣的大规模回收与循环利用提供了可行途径。

关键词：废旧锂离子电池磷酸铁锂提锂渣回收

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An Exact Virtual Network Embedding Algorithm Based on Integer Linear Programming for Virtual Network Request with Location Constraint

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China Communications 2016年第8期13卷 177-183页

作者： zeheng yang Yongan Guo School of Computer Science and Engineering University of Electronic Science and Technology of China(UESTC) College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications

Network virtualization is known as a promising technology to tackle the ossification of current Internet and will play an important role in the future network area. Virtual network embedding(VNE) is a key issue in network virtualization. VNE is NP-hard and former VNE algorithms are mostly heuristic in the *** exact algorithms have been developed in recent years. However, the constraints of exact VNE are only node capacity and link *** on these, this paper presents an exact VNE algorithm, ILP-LC, which is based on Integer Linear Programming(ILP), for embedding virtual network request with location constraints. This novel algorithm is aiming at mapping virtual network request(VNR) successfully as many as possible and consuming less substrate *** topology of each VNR is randomly generated by Waxman model. Simulation results show that the proposed ILP-LC algorithm outperforms the typical heuristic algorithms in terms of the VNR acceptance ratio, at least 15%.

关键词： network virtualization virtual network embedding exact VNE algorithm integer linear Programming location constraint VNR acceptance ratio

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A chemical etching route to controllable fabrication of TiO2 hollow nanospheres for enhancing their photocatalytic activity

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 192-201页

作者： Weixin ZHANG Jie XING zeheng yang Mei KONG Hongxu YAO School of Chemical Engineering Hefei University of Technology Anhui 230009 China Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering Anhui 230009 China

The TiO2 hollow nanospheres with diameters of about 230 nm were prepared by a simple and controllable route based on hydrolysis of Ti（OBu）4 on the surfaces of the Cu20 solid nanospheres followed by inward etching of the Cu20 nanospheres. The as-prepared samples were characterized by X-ray diffraction, transmis- sion electron microscopy and scanning electron micro- scopy. The further post-heat treatment led to the high crystallization of the TiO2 hollow nanospheres. The photocatalytic performances of these samples were evaluated for the photodegradation of rhodamine B （RhB） under UV-light irradiation. The as-prepared TiO2 hollow nanospheres showed higher photocatalytic activity than the CuO and the CuO/TiO2 hollow nanospheres. Effects of temperature and time for post-heat treatment of TiO2 as well as initial RhB concentrations on the RhB photodegradation have also been studied. The results show that the TiO2 hollow nanospheres have the good reusability as photocatalysts and are promising in waste water treatment.

关键词： TiO2 hollow nanospheres rhodamine B,photocatalytic activity

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《临证指南医案》虫药通络法探析

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中医药通报 2024年第1期23卷 36-40页

作者：杨泽恒林敏鲁玉辉福建中医药大学中医学院福建福州350122

叶天士创立“络病”学说,并继承与发扬了虫药通络法。为探讨叶天士《临证指南医案》中虫药通络法的运用特点,文中分别从虫药通络法的来源、叶天士对虫药通络法的运用、虫药通络法的临床发展以及虫类药的特殊服法来探析虫药通络法。其临... 详细信息

叶天士创立“络病”学说,并继承与发扬了虫药通络法。为探讨叶天士《临证指南医案》中虫药通络法的运用特点,文中分别从虫药通络法的来源、叶天士对虫药通络法的运用、虫药通络法的临床发展以及虫类药的特殊服法来探析虫药通络法。其临床应用广泛,可用于治疗各种疾病,包括瘾疹、痹证以及各种脏腑络病,如糖尿病肾病、病毒性肝炎肝纤维化、缺血性脑卒中等。叶天士对虫药通络法的运用,为中医内伤杂病的辨证论治带来了新的思路与方法,对中医临证具有重要的借鉴意义。

关键词：叶天士《临证指南医案》虫药通络法通络

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Novel hierarchical yolk-shell α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres as high specific capacitance electrode materials for supercapacitors

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1322-1331页

作者： Xiqing Luo Miaomiao Jiang Kun Shi Zhangxian Chen zeheng yang Weixin Zhang School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical EngineeringHefei230009China

For high performance supercapacitors, novel hierarchical yolk-shell α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres were controllably synthesized using a facile two-step method based on the solvothermal treatment. The unique α-Ni(OH)_(2) based yolk-shell microstructures decorated with numerous interconnected nanosheets and the heterocomposition features can synergistically enhance reactive site exposure and electron conduction within the microspheres, facilitate charge transfer between electrolyte and electrode materials, and release structural stress during OH− chemisorption/desorption. Moreover, the Mn2O3 sediments distributed over the α-Ni(OH)_(2) microspheres can serve as an effective protective layer for electrochemical reactions. Consequently, when tested in 1 mol·L^(−1) KOH aqueous electrolyte for supercapacitors, the yolk-shell α-Ni (OH)_(2)/Mn_(2)O_(3) microspheres exhibited a considerably high specific capacitance of 2228.6 F·g^(−1) at 1 A·g^(−1) and an impressive capacitance retention of 77.7% after 3000 cycles at 10 A·g^(−1). The proposed α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres with hetero-composition and unique hierarchical yolk-shell microstructures are highly promising to be used as electrode materials in supercapacitors and other energy storage devices.

关键词： α-Ni(OH)_(2)/Mn_(2)O_(3) yolk-shell microspheres electrode material high specific capacitance supercapacitors

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Effects of gradient concentration on the microstructure and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 988-996页

作者： Wenming Li Weijian Tang Maoqin Qiu Qiuge Zhang Muhammad Irfan zeheng yang Weixin Zhang School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China

Nickel(Ni)-rich layered materials have attracted considerable interests as promising cathode materials for lithium ion batteries(LIBs)owing to their higher capacities and lower ***,Mn-rich cathode materials usually suffer from poor cyclability caused by the unavoidable side-reactions between Ni^4+ions on the surface a nd *** design of gradient concentration(GC)particles with Ni-rich inside and Mn-rich outside is proved to be an efficient way to address the ***,a series of LiNi0.6Co0.2Mn0.2O2(LNCM 622)materials with different GCs(the atomic ratio of Ni/Mn decreasing from the core to the outer layer)have been successfully synthesized via rationally designed co-precipitation *** results demonstrate that the GC of LNCM 622 materials plays an important role in their microstructure and electrochemical *** as-prepared GC3.5 cathode material with optimal GC can provide a shorter pathway for lithium-ion diffusion and stabilize the near-surface region,and finally achieve excellent electrochemical performances,delivering a discharge capacity over 176 mAh·g^-1 at 0.2 C rate and exhibiting capacity retention up to 94%after 100 cycles at 1 C.T h e rationally-designed co-precipitation process for fabricating the Ni-rich layered cathode materials with gradient composition lays a solid foundation for the preparation of high-performance cathode materials for LIBs.

关键词： gradient concentration Ni-rich LiNi0.6Co0.2Mn0.2O2 electrochemical performance lithiumion battery

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Nanostructured hollow spheres of hydroxyapatite： preparation and potential application in drug delivery

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Frontiers of Chemical Science and Engineering 2012年第3期6卷 246-252页

作者： Xiaojing ZHANG Weixin ZHANG zeheng yang Zhao ZHANG School of Chemical Engineering Hefei University of TechnologyHefei 230009China Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical Engineering Hefei 230009China

A solvothermal method has been successfully used to prepare nanostructured hydroxyapatite （HA） hollow spheres with average diameters of about 500 nm and shell thicknesses of about 100 nm in a glycerin/water mixed solvent. Transmission electron microscopy （TEM） and field-emission scanning electron microscopy （FESEM） images show that the shells of the HA hollow spheres are actually composed of nanosheets with thicknesses of about 10 nm. By tuning the glycerin/water volume ratio, two other kinds of HA solid spheres with average diameters of about 6 or 20 pm were assembled from nanoflakes. The properties of the different kinds of spheres as drug delivery carriers were evaluated. Ibuprofen （IBU） was chosen as the model drug to load into the HA samples. The nanostructured HA samples showed a slow and sustained release of IBU. The HA hollow spheres exhibited a higher drug loading capacity and more favorable release properties than the HA solid spheres and thus are very promising for controlled drug release applications.

关键词： hydroxyapatite hollow spheres synthesis,drug release

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In-situ design and construction of lithium-ion battery electrodes on metal substrates with enhanced performances：A brief review

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Chinese Journal of Chemical Engineering 2016年第1期24卷 48-52页

作者： Weixin Zhang Yingmeng Zhang zeheng yang Gongde Chen Guo Ma Qiang Wang School of Chemistry and Chemical Engineering Hefei University of Technology Hefei 230009 China Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering Hefei 230009 China

For the ever-growing demand of advanced lithium-ion batteries, it is highly desirable to grow self-supported micro-/nanostructured arrays on metal substrates as electrodes directly. The in-situ growth of electrode materials on the conducting substrates greatly simplifies the electrode fabrication process without using any binders or conductive additives. Moreover, the well-ordered arrays closely connected to the current collectors can provide direct electron transport pathways and enhanced accommodation of strains arisen from lithium ion lithiation/delithiation. This article summarizes our recent work on design and construction of lithium-ion battery electrodes on metal substrates. An aqueous solution-based process and a microemulsion-mediated process have been respectively presented to control the kinetic and thermodynamic processes for the micro-/nanostructured array growth on metal substrates, with particular attention to CuO nanorod arrays and microcog arrays successfully prepared on Cu foil substrates. They can be directly used as binder-free electrodes to build advanced lithium-ion batteries with high energy, high safety and high stability.

关键词： Micro-/nanostructured arrays Metal substrates Lithium-ion batteries Full cells Electrodes

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Constructing P-CoMoO_(4)@NiCoP heterostructure nanoarrays on Ni foam as efficient bifunctional electrocatalysts for overall water splitting

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纳米材料科学:英文版 2023年第3期5卷 278-286页

作者： Ning You Shuai Cao Mengqiu Huang Xiaoming Fan Kun Shi Haijian Huang Zhangxian Chen zeheng yang Weixin Zhang School of Chemistry and Chemical Engineering Hefei University of Technology230009HefeiAnhuiPR China Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering 230009HefeiAnhuiPR China

Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost,high activity and stability is a challenging issue in electrochemical water ***,we report the fabrication of heterostructured P-CoMoO_(4)@NiCoP on a Ni foam substrate through interface engineering,by adjusting its composition and *** from the tailored electronic structure and exposed active sites,the heterostructured P-CoMoO_(4)@NiCoP/NF arrays can be coordinated to boost the overall water *** addition,the superhydrophilic and superaerophobic properties of P-CoMoO_(4)@NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic *** heterostructured PCoMoO_(4)@NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm^(-2) for HER and 252 mV at 100 mA cm^(-2) for *** 1.62 V potential is required to deliver 20 mA cm^(-2) in a two-electrode electrolysis system,providing a decent overall water splitting *** rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.

关键词： Heterostructure P-CoMoO_(4)@NiCoP Bifunctional electrocatalysts Overall water splitting

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