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Manipulating fast Li_(2)S redox via carbon confinement and oxygen defect engineering of In_(2)O_(3)for lithium-sulfur batteries

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Nano Research 2024年第6期17卷 5179-5187页

作者： Jinlei Qin Rui wang Zilong Yuan Pei Xiao deli wang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium-sulfur(Li-S)batteries have been considered as promising energy storage systems due to the merits of high energy density and low ***,the lithium polysulfides(LiPSs)diffusion and sluggish redox kinetics hamper t... 详细信息

关键词： Li-S batteries nitrogen-doped carbon confinement oxygen vacancies bidirectional Li_(2)S redox

Vegetation and Community Changes of Elm (Ulmus pumila) Woodlands in Northeastern China in 1983-2011

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Chinese Geographical Science 2013年第3期23卷 321-330页

作者： LIU Li wang He LIN Changcun wang deli Institute of Grassland Science Key Laboratory of Vegetation Ecology Northeast Normal University College of Land and Environment Shenyang Agricultural University Liaoning Academy of Environmental Sciences

Elm （Ulmus pumila）, widely distributed in the north temperate zone, contributes to a special savanna-like woodland in typical grassland region in the northeastern China. This woodland performs a variety of ecological functions and environmental signifi- cance, such as decreasing soil erosion, stabilizing sand dunes, preserving species diversity. However, in the last approximate 30 years, the species composition, productivity and distribution area of elm woodland has decreased severely. A series of studies have been carried out to find out whether the climate changes or human disturbances caused the degradation of elm woodland and how these factors af- fected elm woodland. In this study, undisturbed, plowing and grazing elm woodland were investigated in 1983 and 2011 by using Point-Centered Quarter method. The relationship between vegetation changes and environmental factors was analyzed by Bray-Curtis ordination. The results show that in 2011, species diversity and understory productivity of undisturbed elm woodland decrease slightly compared to those of undisturbed elm woodland in 1983. However, nearly 60% of the species is lost in the plowing and grazing elm woodland relative to the species undisturbed elm woodland in 1983. Interestingly, plowing stimulates the growth of elm and certain understory species through furrowing soil and accelerating soil nutrient turnover rate. Grazing disturbance not only leads to species loss and productivity decrease, but also induces changes in elm growth （small, short and twisted）. The mean age of the elm was 29 -4- 2 yr in undisturbed and plowing elm woodland, while only 15 yr in the grazing elm woodland. The results of Bray-Curtis ordination analysis show that all sample stands clustered to three groups： Group I including the undisturbed sample stands of 83UE （undisturbed elm wood- land in 1983） and l lUE （undisturbed elm woodland in 2011）; Group II including sample stands of PE （elm woodland disturbed by plowing）; Group III inc

关键词： Elm (Ulmus pumila) woodland species diversity plant distribution Bray-Curtis ordination

Stationary response of stochastic viscoelastic system with the right unilateral nonzero offset barrier impacts

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Chinese Physics B 2019年第1期28卷 195-204页

作者： deli wang Wei Xu Xudong Gu Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072China Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an 710072China

The stationary response of viscoelastic dynamical system with the right unilateral nonzero offset barrier impacts subjected to stochastic excitations is investigated. First, the viscoelastic force is approximately treated as equivalent terms associated with effects. Then, the free vibro-impact(VI) system is absorbed to describe the periodic motion without impacts and quasi-periodic motion with impacts based upon the level of system energy. The stochastic averaging of energy envelope(SAEE) is adopted to seek the stationary probability density functions(PDFs). The detailed theoretical results for Van der Pol viscoelastic VI system with the right unilateral nonzero offset barrier are solved to demonstrate the important effects of the viscoelastic damping and nonzero rigid barrier impacts condition. Monte Carlo(MC) simulation is also performed to verify the reliability of the suggested approach. The stochastic P-bifurcation caused by certain system parameters is further explored. The variation of elastic modulus from negative to zero and then to positive witnesses the evolution process of stochastic P-bifurcation. From the vicinity of the common value to a wider range, the relaxation time induces the stochastic P-bifurcation in the two interval schemes.

关键词： viscoelastic system right unilateral nonzero offset barrier impacts stochastic averaging of energy envelope(SAEE) stochastic P-bifurcation

Sulfurization accelerator coupled Fe_(1-x)S electrocatalyst boosting SPAN cathode performance

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Nano Research 2023年第7期16卷 9231-9239页

作者： Jinlei Qin Yun Lu Rui wang Zhizhan Li Tao Shen deli wang Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Hubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sulfurized polyacrylonitrile(SPAN)cathode exhibits improved cycling stability in carbonate electrolytes due to the existent of-S_(x)^(2-)-(2≤n≤4)***,it is still challenging for SPAN to achieve higher sulfur content,superior conductivity,and faster polysulfide conversion kinetics in ether ***,polyacrylonitrile(PAN),2-morpholinothiobenzothiazole(MBS),and FeCl_(3)coated reduced graphene oxide(rGO)were used to fabricate advanced sulfur cathode through electrospinning technology to address these *** PAN sulfuration reactions,the MBS with abundant unsaturated bonds served as the vulcanization accelerator to facilitate the formation of longer chain sulfur species(-S_(3)-/-S_(4)-)and increase the sulfur content in the SPAN electrode ***,Fe_(1-x)S is in situ converted from FeCl_(3),which acts as the electrocatalyst to promote Li_(2)S nucleation and decomposition *** a result,the Fe_(1-x)S/SPAN/rGO electrode with high sulfur loading of 2.0 mg·cm^(-2)delivers a reversible capacity of 1122 mAh·g^(-1)at 0.1 A·g^(-1).Notably,at a large current density of 5.0 A·g^(-1),the Fe_(1-x)S/SPAN/rGO electrode still displays a high specific capacity of 924 mAh·g^(-1)with an ultra-stable cycling life over 2000 *** present work provides new insights into designing of high-performance electrode materials for long-lasting Li-S batteries.

关键词： Li-S batteries electrocatalyst electrospun sulfurized polyacrylonitrile(SPAN) vulcanization accelerators

Space-confined vapor deposition synthesis of two dimensional materials

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Nano Research 2018年第6期11卷 2909-2931页

作者： Shasha Zhou Lin Gan deli wang Huiqiao Li Tianyou Zhai School of Materials Science and Engineering School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China

Two dimensional （2D） nanomaterials are promising fundamental building blocks for use in the next-generation semiconductor industry due to their unique geometry and excellent （opto）-electronic properties. However, large scale high quality fabrication of 2D nanomaterials remains challenging. Thus, the development of controllable fabrication methods for 2D materials is essential for their future practical application. In this review, we will discuss the importance of the space-confined vapor deposition strategy in the controllable fabrication of 2D materials and summarize recent progress in the utilization of this strategy for the synthesis of novel materials or structures. Using this method, various high quality ultrathin 2D materials, including large-area graphene and boron nitride, ReS2/ReSe2 HfS2, pyramid-structured multilayer MoS2, and the topological insulators BiaSe3 and BiaTe3, have been successfully obtained. Additionally, by utilizing van der Waals epitaxy growth substrates such as mica or other 2D materials, patterned growth of 2D nanomaterials can be easily achieved via a surface-induced growth mechanism. Finally, we provide a short prospect for future development of this strategy.

关键词： two dimensional vapor deposition space confinement transition metaldichalcogenides

Engineering titanium oxide-based support for electrocatalysis

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Journal of Energy Chemistry 2022年第4期31卷 168-183页

作者： Ke Chen Tao Shen Yun Lu Yezhou Hu Jingyu wang Jian Zhang deli wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

The corrosion and weaker interaction with metal catalysts of common carbon supports during electrocatalysis push the development of alternative supports materials. Titanium oxide-based materials have been widely explored as electrocatalysts supports in consideration of their chemical stability, strong interactions with metal catalyst and wider applications in electrocatalytic reactions as well as the improved electronic conductivity. This review summarizes recent research advances in engineering titanium oxide-based supports for the catalysts in electrocatalysis field to provide guidance for designing high performance non-carbon supported electrocatalysts. Typically, the titanium oxide-based supports are classified into shaped TiO_(2), doped TiO_(2), titanium suboxide and TiO_(2)-carbon composites according to the modification methods and corresponding preparation methods. Then the engineering strategies and electrocatalytic applications are discussed in detail. Finally, the challenges, future research directions and perspectives of titanium oxide-based supports for electrocatalysis are presented for practical applications.

关键词： Titanium oxide support Electrocatalysis Strong metal-support interaction Electrochemical reactions

Element doping induced microstructural engineering enhancing the lithium storage performance of high-nickel layered cathodes

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Journal of Energy Chemistry 2023年第2期77卷 461-468,I0012页

作者： Zhizhan Li Xiao Huang Jianing Liang Jinlei Qin Rui wang Jinguo Cheng deli wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HuibeiChina

The high-nickel layered cathodes Li[Ni_(x)Co_(y)Mn_(1-x-y)]O_(2)(x≥0.8)with high specific capacity and long cycle life are considered as prospective cathodes for lithium-ion ***,the microcrack formation and poor structural stability give rise to inferior rate performance and undesirable cycling ***,we propose a dual modification strategy combining primary particle structure design and element doping to modify Li[Ni_(0.95)Co_(0.025)Mn_(0.025)]O_(2) cathode by tungsten and fluorine co-doped(W-F-NCM95).The doping of W can convert the microstructure of primary particles to the unique rod-like shape,which is beneficial to enhance the reversibility of phase transition and alleviate the generation of microcracks.F doping is conducive to alleviating the surface side ***,due to the synergistic effect of W,F codoping,the obtained W-F-NCM95 cathodes deliver a high initial capacity of 236.1 mA h g^(-1) at 0.1 C and superior capacity retention of 88.7%over 100 cycles at 0.5 ***,the capacity still maintains73.8%after 500 cycles at 0.5 C and the texture of primary particle is *** work provides an available strategy by W and F co-doping to enhance the electrochemistry performance of high-nickel cathodes for practical application.

关键词： High-nickel cathodes Multi-strategy Cation-anion co-doping Particle structure design Synergistic effect

Self-templating construction of hollow microspheres assembled by nanosheets with exposed active planes for sodium ion storage

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Nano Research 2023年第4期16卷 4987-4995页

作者： Jianing Liang Zhizhan Li Jinguo Cheng Jinlei Qin Hongfang Liu deli wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

P2-type layered metal oxides have been considered as one of the promising cathode candidates for high-performance Na-ion batteries(SIBs).However,it is still challenging to balance the contradiction of high energy density and long cycle life due to the structural degradation and sluggish ion diffusion ***,the hierarchical P2-Na2/3Ni1/3Mn2/3O2 hollow microspheres assembled by nanosheets are constructed via a self-template *** obtained nanosheets with more exposed electrochemical active planes serving as desodiation/sodiation reactors can provide substantial Na+channels,shorten the diffusion pathways,and accommodate the volume changes during charge/discharge *** from the facile Na+diffusion paths and optimal architecture modulation,the cathode delivers a high initial Coulombic efficiency of 96.0%with a high energy density of 299.7 Wh·kg^(−1).The highly reversible structural evolutions processes are verified by galvanostatic intermittent titration technique(GITT)and operando electrochemical impedance spectroscopy(EIS)measurement,which would significantly improve the cycle stability(83.3%capacity retention at 1.0 C over 500 loops).Furthermore,the full cell assembled by hard carbon presents a high reversible capacity of 71 mAh·g^(−1)at 0.2 C and promising capacity retention(91.5%after 50 cycles).The designing concept of morphological configuration in this work paves an accessible route for building high-performance electrode materials.

关键词： sodium-ion batteries P2-type cathode hollow microspheres self-template nanosheets structure

Recent Advances of Electrocatalyst and Cell Design for Hydrogen Peroxide Production

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Nano-Micro Letters 2023年第6期15卷 270-303页

作者： Xiao Huang Min Song Jingjing Zhang Tao Shen Guanyu Luo deli wang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Processing and Application of Catalytic Materials College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggang 438000People’s Republic of China

Electrochemical synthesis of H_(2)O_(2) via a selective two-electron oxygen reduction reaction has emerged as an attractive alternative to the current energy-consuming anthraquinone process. Herein, the progress on electrocatalysts for H_(2)O_(2) generation, including noble metal, transition metalbased, and carbon-based materials, is summarized. At first, the design strategies employed to obtain electrocatalysts with high electroactivity and high selectivity are highlighted. Then, the critical roles of the geometry of the electrodes and the type of reactor in striking a balance to boost the H_(2)O_(2) selectivity and reaction rate are systematically discussed. After that, a potential strategy to combine the complementary properties of the catalysts and the reactor for optimal selectivity and overall yield is illustrated. Finally, the remaining challenges and promising opportunities for highefficient H_(2)O_(2) electrochemical production are highlighted for future studies.

关键词： Electrochemical synthesis H_(2)O_(2) Oxygen reduction reaction Electrocatalyst