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Regulating the electrochemical activity of Fe-Mn-Cu-based layer oxides as cathode materials for high-performance Na-ion battery

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Journal of Energy Chemistry 2023年第5期80卷 603-613,I0014页

作者： ting-ting wei Xu Liu Shao-Jie Yang Peng-Fei Wang ting-Feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at Qinhuangdao066004HebeiChina

Fe-Mn based layer oxides cathode materials have attracted widespread attention as a potential candidate for sodium-ion batteries(SIBs)owing to the earth abundance,cost-effectiveness and acceptable specific ***,the irreversible phase transition often brings rapid capacity decay,which seriously hinders the practical application in large-scale energy ***,we design a nickel-doped Na_(0.70)Fe_(0.10)Cu_(0.20)Ni_(0.05)Mn_(0.65)O_(2)(NFCNM-0.05)cathode material of SIBs with activated anionic redox reaction,and then inhibit the harmful phase *** ex-situ X-ray diffraction patterns demonstrate the NFCNM-0.05 always keeps the P2 phase during the sodiation/desodiation process,indicating a high structure *** ex-situ X-ray photoelectron spectroscopy implies the redox reactions between O2-and O-occur in the charging process,which offers extra specific ***,the NFCNM-0.05 electrode delivers a high initial discharge capacity of 148 mA h g-1and remains a prominent cycling stability with an excellent capacity retention of 95.9%after 200 cycles at 1 *** addition,the electrochemical impedance spectroscopy and galvanostatic intermittent titration technique show the NFCNM-0.05 electrode possesses fast ion diffusion ability,which is beneficial for the enhancement of rate *** at 10 C,the NFCNM-0.05 can offer a reversible discharge capacity of 81 mA h *** calculation demonstrates the doping of appropriate amount of Ni ions is benefit for the enhancement of the electrochemical performance of the layer *** work provides an effective strategy to enhance the electrochemical performance of Fe-Mn based cathode materials of SIBs.

关键词： Fe-Mn-Cu based oxide Nickel-ion doping Reversible phase transition Cycling stability

Advancement of technology towards high-performance non-aqueous aluminum-ion batteries

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Journal of Energy Chemistry 2021年第6期30卷 169-188,I0005页

作者： ting-ting wei Panpan Peng Si-Yu Qi Yan-Rong Zhu ting-Feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina

Al-ion batteries(AIBs) have been identified as one of the most hopeful energy storage systems after Li-ion batteries on account for the ultrahigh volumetric capacity,high safety and low cost from the rich abundance of ***,some inevitable shortcomings,such as the formation of passive oxide film,hydrogen side reactions and anode corrosion,finally limit the large-scale application of aqueous *** nonaqueous AIBs have been considered as one of most hopeful alternatives for high-powered electrochemical energy storage ***,various technical and scientific obstacles should be resolved because nonaqueous AIBs are still *** significant efforts have aimed to resolve these issues towards large-scale applications,and some important advancement has been *** the present review,we mainly intended to offer an overview of non-aqueous AIBs systems,and we comprehensively reviewed the recent research advancement of the cathode materials,anode materials electrolyte and collectors as well as the fundamental understanding of the functional *** addition,we have also analyzed several technical challenges and summarized the strategies used for overcoming the challenges in improving the electrochemical properties,including morphology control,surface engineering,doping and construction of composite electrodes as well as the charge storage mechanisms of the materials with different crystal *** last,future research orientation and development prospect of the AIBs are proposed.

关键词： Al-ion batteries Electrode Electrolyte Collector Electrochemical performance

Production of rhamnolipids-producing enzymes of Pseudomonas in E. coli and structural characterization

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Frontiers of Chemical Science and Engineering 2017年第1期11卷 133-138页

作者： Kata Kiss wei ting Ng Qingxin Li Institute of Chemical & Engineering Sciences Agency for Science Technology and Research Jurong Island 627833 Singapore

Rhamnolipids are a class ofbiosurfactants that have a great potential to be used in industries. Five proteins/enzymes, namely RhlA, RhlB, RhlC, RhlG and RhlI, are critical for the production of rhamnolipids in Pseudomonas aeruginosa. Four of the 5 proteins except RhlC were successfully over-expressed in E. coli and three of them （RhlA, RhlB and RhlI） were purified and obtained in milligram quantities. The purified proteins were shown to be folded in solution. Homology models were built for RhlA, RhlB and RhlI. These results lay a basis for further structural and functional characterization of these proteins in vitro to favor the construction of super strains for rhamnolipids production.

关键词： rhamnolipids Pseudomonas RhlA RhlB,RhlI protein folding

Effect of heat treatments on Charpy impact properties of 15Cr12MoVWN ferritic/martensitic steel

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Journal of Iron and Steel Research International 2022年第3期29卷 512-518页

作者： ting-wei Ma Xian-chao Hao Ping Wang Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819LiaoningChina Yingkou Institute of Technology Yingkou115014LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina

The Charpy impact properties of 15Cr12MoVWN ferritic/martensitic steel for sodium-cooled reactors with variation in heat treatment factors and parameters are *** results show that the ductile-to-brittle transition temperature(DBTT)increased and the upper shelf energy(USE)decreased with increase in normalizing ***,the variation tendency of DBTT and USE was the opposite with increase in tempering *** tempering temperature showed a greater influence on USE than the normalizing temperature,and normalizing and tempering temperatures had the equally significant effects on DBTT,but the cooling method was not a significant factor for DBTT and *** prior austenite grain and M_(23)C_(6) size were the main influences on DBTT,and the dislocation density was the main factor affecting the variation of *** heat-treatment regime recommended for 15Cr12MoVWN steel was composed of normalizing at 1000-1050℃ for 0.5 h followed by water quenching or air cooling and tempering at 760℃ for 1.5 h.

关键词： 15Cr12MoVWN steel Ductile-to-brittle transition temperature Prior austenite grain size M23C6-MX

Rational construction and decoration of Li_(5)Cr_(7)Ti_(6)O_(25)@Cnanofibers as stable lithium storage materials

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Journal of Energy Chemistry 2022年第8期31卷 400-410,I0011页

作者： ting-ting wei Panpan Peng Yu-Rui Ji Yan-Rong Zhu ting-Feng Yi Ying Xie School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina

Li_(5)Cr_(7)Ti_(6)O_(25) is regarded as a promising anode material for Li-ion batteries(LIBs)because of its low cost and high theoretical ***,the inherently poor conductivity significantly limits the enhancement of its rate capability and cycling stability,especially at high current *** this work,we construct one-dimensional Li_(5)Cr_(7)Ti_(6)O_(25)/C nanofibers by electrospinning method to enhance the kinetic,which realizes high cycling *** coating enhances the structure stability,insertion/extraction reversibility of Li-ions and electrochemical reaction activity,and facilitates the transfer of *** from the unique architecture and component,the Li_(5)Cr_(7)Ti_(6)O_(25)/C(6.6 wt%)nanofiber shows an excellent rate capability with a reversible de-lithiation capacity of 370.8,290.6,269.2,254.3 and 244.9 m Ah g^(-1) at 200,300,500,800 and 1000 m A g^(-1),*** at a higher current density of 1 A g^(-1),Li_(5)Cr_(7)Ti_(6)O_(25)/C(6.6 wt%)nanofiber shows high cycling stability with an initial de-lithiation capacity of 237.8 m Ah g^(-1) and a capacity retention rate of about 84%after 500 *** density functional theory calculation result confirms that the introduction of carbon on the surface of Li_(5)Cr_(7)Ti_(6)O_(25) changes the total density of states of Li_(5)Cr_(7)Ti_(6)O_(25),and thus improves electronic conductivity of the composite,resulting in a good electrochemical performance of Li_(5)Cr_(7)Ti_(6)O_(25)/C ***_(5)Cr_(7)Ti_(6)O_(25)/C nanofibers indicate a great potential as an anode material for the next generation of high-performance LIBs.

关键词： Lithium-ion battery Anode Li_(5)Cr_(7)Ti_(6)O_(25) Electrospinning Nanofibers

Model of downloading strategy from peers and server for saving server bandwidth in P2P VoD system

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 76-86,101页

作者： wei ting DENG Guang-qing CHEN Chang-jia ZHU wei School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China Department ofPPLive P2P-CDN R＆D Shanghai 201203 China

In peer-to-peer （P2P） video on demand （VoD） system, once the P2P downloading rate cannot satisfy the need of playback, server is quickly referred to for help in providing enough bandwidth. Thus the switch of downloading from other peers （P2P） and server （HTTP） exists. This paper uses the proportion of P2P downloading amount （PPDA） during the video watching process to measure server load. This article is interested in finding a better strategy or switch rule between P2P and HTTP downloading for saving server bandwidth. The authors suggest and model a kind of switch rule based on local buffer amount, using mathematical theory of Brownian motion. It can effectively alleviate the impact of P2P rate fluctuation, reduce the switch times and improve the PPDA by at least 3%-5% on the basis of the former switch rule, which means substantial cost can be saved. Particularly the PPDA is related with the ratio of playback bit rate to the HTTP downloading rate which means the PPDA can be restricted by controlling the ratio in the real-world system. Though the result comes from constant bit rate （CBR） video supposition, it provides perspective and method for variable bit rate （VBR） application, and valuable insights for the future development of P2P VoD system.

关键词： P2P VoD downloading server load

Anesthetic management of a pregnant patient with Eisenmenger’s syndrome:A case report

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World Journal of Clinical Cases 2023年第27期11卷 6597-6602页

作者： Ying Zhang ting-ting wei Gang Chen Department of Anesthesiology Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310006Zhejiang ProvinceChina

BACKGROUND Eisenmenger’s syndrome(ES)is a rare complication of congenital heart disease that includes pulmonary artery hypertension and reversed or bidirectional *** mortality rate of pregnant women with ES is 30%-70%due to pathophysiological *** perioperative management of a pregnant patient with ES is a challenge for *** SUMMARY A 38-year-old pregnant woman was admitted to the cardiology department of our hospital at 22 wk of gestation with complaints of chest tightness and shortness of breath for 3 *** echocardiography revealed a bidirectional shunt between the descending aorta and pulmonary artery after interventional closure of the patent ductus arteriosus and severe pulmonary *** in pregnancy was our primary *** patient elected to terminate the pregnancy under adequate preoperative preparation,rigorous intraoperative monitoring,and perfect epidural *** was discharged successfully on postoperative day *** Our experience in this case suggests that successful outcomes are possible in pregnant patients with ES for termination of pregnancy under epidural anesthesia and intensive monitoring.

关键词： Eisenmenger’s syndrome Pulmonary artery hypertension Pregnancy Monitoring Epidural anesthesia Case report

Management of an intracranial hypotension patient with diplopia as the primary symptom:A case report

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World Journal of Clinical Cases 2021年第22期9卷 6544-6551页

作者： ting-ting wei Hua Huang Gang Chen Fei-Fang He Department of Anesthesiology Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Department of Pain Management Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Intracranial hypotension(IH)is a disorder involving cerebrospinal fluid(CSF)hypovolemia due to spontaneous or traumatic spinal CSF leakage and is easily being misdiagnosed or missed,especially in these patients without the prototypical manifestation of an orthostatic *** present,the management of IH with both cranial nerve VI palsy and bilateral subdural hematomas(SDHs)is still *** SUMMARY A 67-year-old male Chinese patient complained of diplopia on the left side for one and a half *** tomography revealed bilateral SDHs and a midline ***,neurotrophic drugs were not effective,and 3 d after admission,he developed a non-orthostatic headache and neck *** magnetic resonance imaging revealed dural enhancement as an additional feature,and IH was *** resonance myelography was then adopted and showed CSF leakage at multiple sites in the spine,confirming the diagnosis of having *** patient fully recovered following multiple targeted epidural blood patch(EBP)*** IH is a rare disease,and to the best of our knowledge,IH with diplopia as its initial and primary symptom has never been *** this study,we also elucidated that it could be safe and effective to treat IH patients with associated cranial nerve VI palsy and bilateral SDHs using repeated EBP therapy.

关键词： Cranial nerve VI palsy Epidural blood patch Intracranial hypotension Subdural hematoma Case report

A facile transformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot strategy

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Chinese Chemical Letters 2019年第2期30卷 383-385页

作者： ting wei Yongming Zeng wei He Lili Geng Liang Hong Department of Chemistry and Applied Chemistry Changji University State Key Laboratory of Coordination Chemistry Nanjing University

A facile transformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot cascade strategy is described. A variety of α-amino ketones are obtained in moderate to good yields under mild conditions. To overcome the multi-step synthesis, N-bromosuccinimide is involved in multiple tasks, playing a key role in the reaction course.

关键词： α-Amino ketones N-Bromosuccinimide Alkynes One-pot synthesis