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High-rate sodium-ion storage of vanadium nitride via surface-redox pseudocapacitance

Interdisciplinary Materials 2023年第3期2卷 434-442页

作者： Qiulong Wei Tingyi Huang Xiaojuan Huang Binhao Wang Yalong Jiang Dafu Tang Dong-Liang Peng Bruce Dunn Liqiang Mai Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamenChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina Department of Materials Science and Engineering University of California Los AngelesLos AngelesCaliforniaUSA

Vanadium nitride(VN)electrode displays high-rate,pseudocapacitive responses in aqueous electrolytes,however,it remains largely unclear in nonaqueous,Na+-based *** traditional view supposes a conversion-type mechanism for Na+storage in VN anodes but does not explain the phenomena of their size-dependent specific capacities and underlying causes of pseudocapacitive charge storage ***,we insightfully reveal the VN anode exhibits a surface-redox pseudocapacitive mechanism in nonaqueous,Na+-based electrolytes,as demonstrated by kinetics analysis,experimental observations,and first-principles *** ex situ X-ray photoelectron spectroscopy and semiquantitative analyses,the Na+storage is characterized by redox reactions occurring with the V5+/V4+to V3+at the surface of VN particles,which is different from the well-known conversion reaction *** pseudocapacitive performance is enhanced through nanoarchitecture design via oxidized vanadium states at the *** optimized VN-10 nm anode delivers a sodium-ion storage capability of 106 mAh g−1 at the high specific current of 20 A g−1,and excellent cycling performance of 5000 cycles with negligible capacity *** work demonstrates the emerging opportunities of utilizing pseudocapacitive charge storage for realizing high-rate sodium-ion storage applications.

关键词： high-rate capability pseudocapacitance sodium-ion storage vanadium nitride

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The Study of Extrusion Casting on the Microstructure and Properties of Hypereutectic Al-Si Alloy 75

The Study of Extrusion Casting on the Microstructure and Pro...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Yunguan You, Zhiyong Zhang, Mengjun Wang, Libo Liu, Chunlian School of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan030024 China

In this study, P and Sr composite modified hypereutectic Al-Si alloy samples were prepared by gravity casting and extrusion casting, with extrusion ratios of 400 MPa, 500 MPa, and 600 MPa. The microstructure and properties of hypereutectic aluminum-silicon alloy under gravity casting and different extrusion ratios were studied. The results show that the properties of extrusion cast alloys are better than those of gravity cast alloys, and as the extrusion ratio increases, the refinement effect on the silicon phase becomes better. Under an extrusion ratio of 600 MPa, the refinement effect on primary silicon and eutectic silicon is the best, with the primary silicon partially becoming blunt, decreasing in quantity, and having small dimensional differences with an average size of 29 μm. The density of eutectic silicon increases, and the alloy has good mechanical properties under this condition, with a tensile strength of 316 MPa, an elongation of 1.94%, and a hardness of 115.1 HV. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Tensile strength

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A Desymmetric Dearomatization Cyclopropanation of[2.2]Paracyclophane

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CCS Chemistry 2025年第5期7卷 1509-1521页

作者： Dong Chen Yi Zhou Chen-Ho Tung Zhi-Xiang Yu Zhenghu Xu Key Laboratory of Colloid and Interface Chemistry of Ministry of Education School of Chemistry and Chemical EngineeringShandong UniversityJinanShandong 250100 Beijing National Laboratory of Molecular Sciences(BNLMS) Key Laboratory of Bioorganic Chemistry and Molecular EngineeringCollege of ChemistryPeking UniversityBeijing State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032 Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024

Chiral[2.2]paracyclophane(PCP)is an intriguing prevalent scaffold widely utilized inπ-stacked polymers,luminescent materials,and asymmetric ***,current synthetic methods to access chiral PCP derivatives are still limited to physical separation and chemical or kinetic *** direct desymmetric functionalization of nonsubstituted PCP has been a challenge since its discovery 70 years ***,we present a catalytic desymmetric dearomatization cyclopropanation reaction of PCP,providing rapid access to enantioenriched PCP cyclopropyl carboxylates with continuous tertiary/quaternary/quaternary chiral *** application of the chiral PCPs obtained has also been demonstrated by transformation to structurally novel C_(2) symmetric dirhodium *** equal importance,detailed density functional theory calculations have been carried out to reveal the mechanism of this *** key to this success is a structurally symmetric bulky C_(4) dirhodium catalyst:noncovalent interactions exist between substrates and catalysts,which form a cavity to host substrates,and mainly affect the regio-and enantioselectivity.

关键词： asymmetric catalysis cyclopropanation [2.2]paracyclophane carbene dearomatization

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CoS_(2)/N,S co-doped mesoporous carbon with 3D micro-nano crosslinked structure as efficient bifunctional oxygen electrocatalysts for zinc-air batteries

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Chinese Chemical Letters 2023年第5期34卷 604-609页

作者： Wei Wang Liqin Li Jie Ouyang Jialin Gong Jie Tian Liang Chen Junlin Huang Binhong He Zhaohui Hou Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang 414006China Guangxi Key Laboratory of Low Energy Material Guangxi Normal UniversityGuilin 541004China Hubei Key Laboratory of Pollutant Analysis&Reuse Technology Hubei Normal UniversityHuangshi 435002China Hunan Province Key Laboratory of Materials Surface&Interface Science and Technology Material Science and Engineering SchoolCentral South University of Forestry and TechnologyChangsha 410004China

This work describes a bifunctional oxygen catalyst made of cobalt disulfide encapsulated in N,S codoped mesoporous carbon with a novel three-dimensional micro-nano crosslinking *** proposed composite materials exhibit promising oxygen electrocatalytic activity and *** composite assembled rechargeable zinc-air battery can achieve a high power density of 208.9 m W/cm^(2),and can be stably cycled for more than 160 ***,the all-solid zinc-air battery assembled with the electrocatalyst also performs *** micro-nano crosslinking and high porosity structure,as well as the large number of active sites generated by the synergy of N,S doping and the close interface between carbon matrix and CoS_(2),contribute to the composite's exceptional electrochemical *** study's rational strategy lays the path for the development of other high-performance bifunctional electrocatalysts.

关键词： Micro-nano crosslinked CoS_2 ORR OER Zn-air battery

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Specific Ion Effects on the Enzymatic Degradation of Polyester Films

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Chinese Journal of Polymer science 2023年第4期41卷 476-482,I0005页

作者： Jian Zhang Jie Zhu Zan Hua Guang-Ming Liu Department of Chemical Physics Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei230026China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province College of Material and Textile EngineeringJiaxing UniversityJiaxing314001China Biomass Molecular Engineering Center and Department of Materials Science and Engineering School of Forestry and Landscape ArchitectureAnhui Agricultural UniversityHefei230036China

Soil environment on earth contains a variety of ions,which are expected to play a vital role in the biodegradation of plastics discarded in the *** this work,poly(butyleneadipate-co-terephthalate)(PBAT)is employed as a model biodegradable plastic to study the specific ion effects on the enzymatic degradation of polyester *** results show that the specific ion effects on the enzymatic degradation rate of the PBAT films and on the catalytic rate constant for the enzymatic hydrolysis of the ester bonds are strongly dependent on temperature and ionic *** the enzymatic degradation rate and catalytic rate constant decrease following the trends Na^(+)>K^(+)>Ca^(2+)and Cl^(-)>SO_(4)^(2-)>NO_(3)^(-)for cations and anions,respectively,indicating that the ion-specific enzymatic degradation of the PBAT films is closely correlated with the specific ion effects on enzymatic hydrolysis of the ester *** study shows that the specific ion effects on the enzyme activity can be understood by taking into account the ion-specific cation-anion interaction,ionic dispersion force,salting-out effect and salting-in *** study of specific ion effects on the enzymatic hydrolysis of the ester bonds and the resultant enzymatic degradation of the PBAT films would offer us a new clue to develop new biodegradable,environmentally friendly synthetic plastics.

关键词： Specific ion effects Biodegradable films Ion-enzyme interactions Enzyme activity

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Sr Study on the Metamorphic Mechanism of Eutectic Silicon in Hypereutectic Al-Si Alloys 75

Sr Study on the Metamorphic Mechanism of Eutectic Silicon in...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Mengjun You, Zhiyong Zhang, Yunguan Wang, Libo School of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan030024 China

The addition of a Sr modifier during the forming process of a hypereutectic Al-Si alloy results in the transformation of the acicular eutectic silicon within the alloy structure into rod or particle form. This process leads to an improvement in the comprehensive mechanical properties of the alloy. However, there is a lack of research on the mechanism of eutectic silicon metamorphism, especially on the interaction between the modifier and silicon phase. In this paper, the structural stability of Si(100) clean surface and adsorption model surface is studied by using the first-principle calculation method based on density functional theory. The results show that Sr is easily adsorbed on the surface of silicon phase and tends to fall at the Vacancy site. Then, Al-15%Si alloys with different Sr content are prepared by metal mold casting. By observing the SEM scans of the microstructure of alloy samples, it is found that Sr atoms are completely adsorbed and enriched on the surface of eutectic silicon. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Hypereutectic alloys

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Effect of carbon nanotubes addition on thermoelectric properties of Ca_(3)Co_(4)O_(9)ceramics

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Chinese Physics B 2022年第4期31卷 622-628页

作者： Ya-Nan Li Ping Wu Shi-Ping Zhang Yi-Li Pei Jin-Guang Yang Sen Chen Li Wang Beijing Key Laboratory for MagnetoPhotoelectrical Composite and Interface Science School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

Increasing the phonon scattering center by adding nanoparticles to thermoelectric materials is an effective method of regulating the thermal *** this study,a series of Ca3 Co_(4)O_(9)/x wt.%CNTs(x=0,3,5,7,10)polycrystalline ceramic thermoelectric materials by adding carbon nanotubes(CNTs)were prepared with sol-gel method and cold-pressing sintering *** results of x-ray diffraction and field emission scanning electron microscopy show that the materials have a single-phase structure with high orientation and sheet like *** effect of adding carbon nanotubes to the thermoelectric properties of Ca_(3)Co_(4)O_(9)was systematically *** test results of thermoelectric properties show that the addition of carbon nanotubes reduces the electrical conductivity and Seebeck coefficient of the ***,the thermal conductivity of the samples with carbon nanotubes addition is lower than that of the samples without carbon *** 625 K,the thermal conductivity of Ca3 Co_(4)O_(9)/10 wt.%CNTs sample is reduced to0.408 W·m^(-1)·K^(-1),which is about 73%lower than that of the original *** the three parameters are coupled,the figure of merit of Ca_(3)Co_(4)O_(9)/3 wt.%CNTs sample reaches 0.052,which is 29%higher than that of the original *** shows that an appropriate amount of carbon nanotubes addition can reduce the thermal conductivity of Ca_(3)Co_(4)O_(9)ceramic samples and improve their thermoelectric properties.

关键词： Ca_(3)Co_(4)O_(9) carbon nanotubes thermal conductivity thermoelectric properties

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Promoting CO_(2) and H_(2)O activation on O-vacancy regulated In-Ti dual-sites for enhanced CH_(4) photo-production

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Journal of Energy Chemistry 2023年第11期86卷 599-608,I0013页

作者： Cong Chen Liang Chen Yangguang Hu Ke Yan Ting Wang Youju Huang Chao Gao Junjie Mao Shoujie Liu Benxia Li School of Chemistry and Chemical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121ZhejiangChina School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002AnhuiChina School of Materials Science and Engineering Anhui UniversityHefei 230601AnhuiChina

engineering the specific active sites of photocatalysts for simultaneously promoting CO_(2)and H_(2)O activation is important to achieve the efficient conversion of CO_(2)to hydrocarbon with H_(2)O as a proton source under ***,we delicately design the In/TiO_(2)-VOphotocatalyst by engineering In single atoms(SAs)and oxygen vacancies(VOs)on porous TiO_(2).The relation between structure and performance of the photocatalyst is clarified by both experimental and theoretical analyses at the atomic *** In/TiO_(2)-VOphotocatalyst furnish a high CH_(4)production rate up to 35.49μmol g^(-1)h^(-1)with a high selectivity of 91.3%under simulated sunlight,while only CO is sluggishly generated on TiO_(2)-*** combination of in situ spectroscopic analyses with theoretical calculations reveal that the VOsites accelerate H_(2)O dissociation and increase proton feeding for CO_(2)***,the VOregulated In-Ti dual sites enable the formation of a stable adsorption conformation of In-C-O-Ti intermediate,which is responsible for the highly selective reduction of CO_(2)to CH_(4).This work demonstrates a new strategy for the development of effective photocatalysts by coupling metal SA sites with the adjacent metal sites of support to synergistically enhance the activity and selectivity of CO_(2)photoreduction.

关键词： In single atoms Oxygen vacancies CO_(2) photoreduction Water dissociation Synergetic effect

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Charge polarity inversion and zincophilicity improvement for chitosan separator towards durable aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 110-119,I0004页

作者： Jiaqi Yu Bo Liu Hong Ma Zehua Fan Xiang Han Qinghua Tian Jizhang Chen Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina College of Mathematics and Physics Jinggangshan UniversityJi'an 343009JiangxiChina Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical EngineeringZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

Aqueous zinc-ion batteries encounter enormous challenges such as Zn dendrites and parasitic *** modification is a highly effective strategy to address these *** the advantages of low cost,nontoxicity,biodegradability,good film-forming ability,superior hydro phi licity,and rich functional groups,chitosan is an ideal matrix for constructing ***,the presence of positive charges within chitosan in weakly acidic electrolytes is unfavorable for dendrite ***,Schiff base reaction is introduced to modify chitosan matrix,transforming its charge polarity from positive to ***,NbN with excellent zincophilicity is coated onto chitosan matrix,forming a Janus separator with low thickness of 19μm and considerably improved mechanical *** resultant separator can promote the transport of Zn^(2+)ions while triggering a repulsive shielding effect against anions,therefore dramatically enhancing Zn^(2+)ion transfer number from 0.28 to *** separator can also facilitate desolvation process,improve exchange current density,restrict two-dimensional Zn^(2+)ion diffusion,and enhance electrochemical kinetics,contributing to significantly inhibited dendrite growth,by-product formation,and hydrogen ***,stable and reversible Zn stripping/plating process is enabled for over 2500 h at 2 mA cm^(-2)and 2 mAh cm^(-2).And great rate capability and excellent cyclability can be achieved for full batteries even under harsh *** work provides new insights into separator design for Zn-based batteries.

关键词： Separator modification Charge polarity regulation Dendrite inhibition Aqueous zinc-ion batteries Chitosan utilization

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High-stable and High-capacity Sn/SnO_(2)@C as Anode of Lithium-ion Batteries

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Journal of Wuhan University of Technology(Materials science) 2024年第4期39卷 805-813页

作者：徐天星 WU Jie 李亚娟肖宏 College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science Central South UniversityChangsha 410083China Hunan Times New Energy Technology Co. LtdLuxi 416100China

We synthesized size-controllable nanoparticles with homogeneous distribution of carbon and Sn/SnO_(2)by a solvothermal *** effects of different carbon content and hydrothermal time on the composition,morphology and electrochemical properties of the materials were *** with bulk materials,nanoparticles materials not only have high specific surface area,but also can provide abundant reaction sites,thus enhancing the electrochemical activity of electrode *** importantly,the optimized microspheres Sn/8C-24 delivers a superior electrochemical performance,achieving a specific discharge capacity of 700.4 mAh·g^(-1)after 150 cycles at 0.5 A·g^(-1),and the Coulomb efficiency reaches 98.65%,which is promising for anode of LIBs.

关键词： Sn anode nanoparticles hydrothermal method

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