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Bifunctional air electrodes for flexible rechargeable Zn-air batteries

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Chinese Chemical Letters 2021年第3期32卷 999-1009页

作者： Xiaoling Lang Zhibiao Hu caiyun wang Fujian Provincial Key Laboratory of Clean Energy Materials Longyan UniversityLongyan 364000China ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of WollongongNorth WollongongNSW 2500Australia

Flexible rechargeable Zn-air batteries are considered as one of the most promising battery systems to drive flexible and wearable electronic devices owing to their high safety,high gravimetric energy density,low self-discharge and low *** of the key challenges is to develop air electrodes with high performance and high mechanical *** minireview discusses the recent progress in the design and fabrication of flexible air *** focuses on the latest innovations in bifunctional oxygen reduction reaction and oxygen evolution reaction electrocatalysts,mainly including carbon-based materials(e.g.,heteroatom-doped carbon,metal-nitrogen moieties doped carbon),metal oxides(e.g.,spinel oxides,perovskite oxides)and their *** aims to provide an insight into the structureproperty relationship of bifunctional *** also discuss the challenges and future perspectives.

关键词： Zn-air batteries Flexible air electrodes Bifunctional catalysts Carbon materials Metal oxides

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

A Sequential Adaptive Method for Enhancing DOA Tracking Performance

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第6期33卷 -页

作者： Youssef Fayad wang caiyun Cao Qunsheng College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics College of Astronautics Nanjing University of Aeronautics and Astronautics

A sequential processing is presented aiming at optimizing the direction of arrival(DOA)tracking ***,current positions and Doppler frequency are estimated and a mathematical model is derived in order to clarify the effect of Doppler frequency on the *** Doppler effect is employed within subspace concept in order to refine the estimation of the target ***,a renewed weight factor that depends on target maneuver is employed in order to realize more accurate association and smoothing *** results show that the presented method has high accuracy in DOA tracking.

关键词： tracking maneuver direction of arrival(DOA) Doppler effect

Soft-Control for Collective Opinion of Weighted DeGroot Model

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Journal of Systems Science & Complexity 2017年第3期30卷 550-567页

作者： HAN Huawei QIANG Chengcang wang caiyun HAN Jing Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China Sinopec Research Institute of Safety Engineering Qingdao 266000China.

The DeGroot model is a classic model to study consensus of opinion in a group of individuals(agents). Consensus can be achieved under some circumstances. But when the group reach consensus with a convergent opinion value which is not what we expect, how can we intervene the system and change the convergent value? In this paper a mechanism named soft control is first introduced in opinion dynamics to guide the group's opinion when the population are given and evolution rules are not allowed to change. According to the idea of soft control, one or several special agents,called shills, are added and connected to one or several normal agents in the original group. Shills act and are treated as normal agents. The authors prove that the change of convergent opinion value is decided by the initial opinion and influential value of the shill, as well as how the shill connects to normal agents. An interesting and counterintuitive phenomenon is discovered: Adding a shill with an initial opinion value which is smaller(or larger) than the original convergent opinion value dose not necessarily decrease(or increase) the convergent opinion value under some conditions. These conditions are given through mathematical analysis and they are verified by the numerical tests. The authors also find out that the convergence speed of the system varies when a shill is connected to different normal agents. Our simulations show that it is positively related to the degree of the connected normal agent in scale-free networks.

关键词： Consensus DeGroot model intervention strategy opinion dynamics soft control.

Access control scheme with attribute revocation for SWIM

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The Journal of China Universities of Posts and Telecommunications 2017年第6期24卷 49-54页

作者： Wu Zhijun Cui Zihan wang caiyun Lei Jin School of Electronic Information and Automation Civil Aviation University of China Tianjin 300300 China

Access control scheme is proposed for System Wide Information Management （SWIM） to address the problem of attribute revocation in practical applications. Based on the attribute based encryption （ABE）, this scheme introduces the proxy re-encryption mechanism and key encrypting key （KEK） tree to realize fine-grained access control with attribute revocation. This paper defines the attributes according to the status quo of civil aviation. Compared with some other schemes proposed before, this scheme not only shortens the length of ciphertext （CT） and private key but also improves the efficiency of encryption and decryption. The scheme can resist collusion attacks and ensure the security of data in SWIM.

关键词： SWIM access control proxy re-encryption attribute revocation

Molybdenum and tungsten chalcogenides for lithium/sodium-ion batteries: Beyond MoS2

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Journal of Energy Chemistry 2019年第6期28卷 100-124页

作者： Junda Huang Zengxi Wei Jiaqin Liao Wei Ni caiyun wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 4 J0082HunanChina Faculty of Technology University of OuluOulu 90014Finland Panzhihua University Panzhihua 617000SichuanChina ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteAIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia Institute of Advanced Electrochemical Energy Xi'an University of TechnologyXi'an 710048ShaanxiChina

Molybdenum and tungsten chalcogenides have attracted tremendous attention in energy storage and conversion due to their outstanding physicochemical and electrochemical *** are intensive studies on molybdenum and tungsten chalcogenides for energy storage and conversion,however,there is no systematic review on the applications of WS2,Mo Se2and WSe2as anode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs),except Mo *** the importance of these contents,it is extremely necessary to overview the recent development of novel layered WS2,Mo Se2and WSe2beyond Mo S2in energy ***,we will systematically overview the recent progress of WS2,Mo Se2and WSe2as anode materials in LIBs and *** review will also discuss the opportunities,and perspectives of these materials in the energy storage fields.

关键词： MoSe2 WS2 WSe2 Lithium-ion batteries Sodium-ion batteries

Electrochemical CO2 reduction over nitrogen-doped SnO2 crystal surfaces

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Journal of Energy Chemistry 2019年第6期28卷 22-30页

作者： Yuefeng Zhang Jianjun Liu Zengxi Wei Quanhui Liu caiyun wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina ARC Centre of Excellence for Electromaterials Science. Intelligent Polymer Research Institute AIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia

Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for CO2 *** catalyst SnO2 can convert CO2 molecules into valuable formic acid(HCOOH).Incorporating heteroatom N into SnO2 further improves its catalytic *** understand the mechanism and realize a highly efficient CO2-to-HCOOH conversion,we used density functional theory(DFT)to calculate the free energy of CO2 reduction reactions(CO2RR)on different crystal planes of N-doped SnO2(N-SnO2).The results indicate that N-SnO2 lowered the activation energy of intermediates leading to a better catalytic performance than pure *** also discovered that the N-Sn O2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the CO2-to-HCOOH *** intermediate of CO2RR on N-SnO2 is HCOO*or COOH* instead of OCHO*.These results may provide useful insights into the mechanism of CO2RR,and promote the development of heteroatomdoped catalyst for efficient CO2RR.

关键词： CO2 reduction reaction SnO2 Crystal surface Electrocatalysis First principles

Porous bowl-shaped VS2 nanosheets/graphene composite for high-rate lithium-ion storage

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Journal of Energy Chemistry 2020年第4期29卷 24-32页

作者： Daxiong Wu caiyun wang Mingguang Wu Yunfeng Chao Pengbin He Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research InstituteUniversity of WollongongNew South Wales 2522Australia Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina State Key Lab of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Two-dimensional (2D) layered vanadium disulfide (VS2) is a promising anode material for lithium ion batteries (LIBs) due to the high theoretical ***,it remains a challenge to synthesize monodispersed ultrathin VS2 nanosheets to realize the full ***,a novel solvothermal method has been developed to prepare the monodispersed bowl-shaped NH3-inserted VS2 nanosheets (VS2).The formation of such a unique structure is caused by the blocked growth of (001) or (002) crystal planes in combination with a ripening process driven by the *** annealing treatment in Ar/H2creates porous monodispersed VS2(H-VS2),which is subsequently integrated with graphene oxide to form porous monodispersed H-VS2/rGO composite coupled with a reduction *** an anode material for LIBs,H-VS2/rGO delivers superior rate performance and longer cycle stability:a high average capacity of 868/525 mAh g^-1 at a current density of 1/10 A g^-1;a reversible capacity of 1177/889 mAh g^-1 after 150/500 cycles at 0.2/1 A g^-*** excellent electrochemical performance may be attributed to the increased active sites available for lithium storage,the alleviated volume variations and the shortened Li-ion diffusion induced from the porous structure with large specific surface area,as well as the protective effect from graphene nanosheets.

关键词： Vanadium disulfide Graphene Lithium-ion batteries Nanosheets Composite

Ag-assisted CeO2 catalyst for soot oxidation

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Frontiers of Materials Science 2019年第3期13卷 288-295页

作者： Lirong ZENG Lan CUI caiyun wang Wei GUO Cairong GONG Institute of New Energy School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Center of Analysis Tianjin UniversityTianjin 300072China

In this work,the Ag loaded Ce-based catalyst was synthesized(by the sol-gel method)and its performance was studied by TG,H2-TPR,XRD,SEM,TEM,BET and *** results show that Ag nanoparticles be successfully loaded onto the CeO2 surface and the relative content of Ag nanoparticles is about 10.22 wt.%close to the theoretical value(10%).XPS shows that Ag nanoparticles induce a great number of oxygen vacancies in the CeO2 lattice through the electronic transfer,and H2-TPR indicates that the Ag-assisted CeO2 catalyst exhibits a better reduction performance and Ag nanoparticles can promote O^- transform into O2^-.The catalytic activity for soot oxidation was studied by TG under air atmosphere and the activity was found to be obviously enhanced when Ag nanoparticles be load on the surface of CeO2(T10=386℃,79o=472.5℃,Tm=431℃).The reaction mechanism was also presented and Oi species is regarded as the determinant factor for the catalytic activity.

关键词： soot oxidation CeO2 oxygen vacancy