检索结果-南通市图书馆

Frontiers of Chemical Science and Engineering 2023年第11期17卷 1707-1717页

作者： Gaohui Du Yi Fan Lina Jia Yunting Wang Yawen Hao Wenqi Zhao Qingmei Su Bingshe Xu Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021China

Water electrolysis technology is considered to be one of the most promising means to produce ***,aiming at the problems of high overpotential and slow kinetics in water splitting,N-doped porous carbon nanofibers-coupled CoNi_(2)S_(4)nanoparticles are prepared as bifunctional *** the strategy,NaCl is used as the template to prepare porous carbon nanofibers with a large surface area,and sulfur vacancies are created to modulate the electronic structure of CoNi_(2)S_(4).Electron spin resonance confirms the formation of abundant sulfur vacancies,which largely reduce the bandgap of CoNi_(2)S_(4)from 1.68 to 0.52 *** narrowed bandgap is conducive to the migration of valence electrons and decreases the charge transfer resistance for electrocatalytic ***,the uniform distribution of CoNi_(2)S_(4)nanoparticles on carbon nanofibers can prevent the aggregation and facilitate the exposure of electrochemical active ***,the composite catalyst exhibits low overpotentials of 340 mV@100 mA·cm^(-2)for oxygen evolution reaction and 380 mV@100 mA·cm^(-2)for hydrogen evolution *** assembled electrolyzer requires 1.64 V to achieve 10 mA·cm^(-2)for overall water-splitting with good long-term *** excellent performance results from the synergistic effect of porous structures,sulfur deficiency,nitrogen doping,and the well-dispersed active component.

关键词： nanoparticle sulfur vacancy porous carbon nanofiber transition metal sulfides electrolysis

S vacant CuIn_(5)S_(8) confined in a few-layer MoSe_(2) with interlayerexpanded hollow heterostructures boost photocatalytic CO_(2) reduction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第1期41卷 144-154页

作者： Li-Juan Chen Ting-Ting Liu Shu-Ming Liu Sheng Cai Xiao-Xiao Zou Jing-Wen Jiang Zhi-Yuan Mei Gen-Fu Zhao Xiao-Fei Yang Hong Guo School of Materials and Energy Yunnan UniversityKunming 650091China Nanomaterials and Energy Lab Department of Mechanical and Materials EngineeringWestern UniversityLondonON N6A 5B9Canada

The conversion of CO_(2)into CO,CH_(4)and other hydrocarbons through solar energy can alleviate the energy shortage *** design a novel photocatalyst with S defects CuIn_(5)S_(8)@MoSe_(2)hollow *** interlayerexpanded MoSe_(2)can increase the adsorption of *** unique hollow structure can improve the light utilization efficiency and the electron–holes ***_(5)S_(8)with S vacancies in bimetallic sites has high selectivity and photocatalytic reduction of CO_(2)***,S vacant CuIn_(5)S_(8)confined in a few-layers MoSe_(2)with interlayer-expanded hollow heterostructures exhibit super performance for photocatalytic CO_(2)*** 8-h light reaction,the outputs of CO and CH_(4)for the 15.3 wt%CuIn_(5)S_(8)@MoSe_(2)sample containing S vacancies(Vs)are 30.4 and 14.7 lmol·g^(-1),*** mechanism is also investigated in detail through in situ Fourier transform infrared spectroscopy technology.

关键词： sulfur vacancy CuIn_(5)S_(8) MoSe_(2)heterojunction Photocatalytic CO_(2)reduction

Study of CO adsorption on perfect and defective pyrite (100) surfaces by density functional theory

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2011年第1期20卷 60-64页

作者： Yudong Du Wenkai Chen Yongfan Zhang Xin Guo Department of Chemistry Fuzhou University Fuzhou 350108 Fujian China： State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 410074 Hubei China

First-principles calculations based on density functional theory （DFT） and the generalized gradient approximation （GGA） have been used to study the adsorption of CO molecule on the perfect and defective FeS 2 （100） surfaces. The defective Fe 2 S（100） surfaces are caused by sulfur deficiencies. Slab geometry and periodic boundary conditions are employed with partial relaxations of atom positions in calculations. Two molecular orientations, Cand O-down, at various distinct sites have been considered. Total energy calculations indicated that no matter on perfect or deficient surfaces, the Fe position is relatively more favored than the S site with the predicted binding energies of 120.8 kJ/mol and 140.8 kJ/mol, respectively. Moreover, CO was found to be bound to Fe atom in vertical configuration. The analysis of density of states and vibrational frequencies before and after adsorption showed clear changes of the C–O bond.

关键词： density functional theory carbon monoxide FeS 2 (100) sulfur vacancy adsorption

Fast charge transfer kinetics in Sv-ZnIn_(2)S_(4)/Sb_(2)S_(3)S-scheme heterojunction photocatalyst for enhanced photocatalytic hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 533-542页

作者： Wei Li Jia-Jun Li Zhi-Fei Liu Hong-Yu Ma Peng-Fei Fang Rui Xiong Jian-Hong Wei Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan430072China

Constructing a S-scheme heterojunction with tight interface contact and fast charge transfer is beneficial to improving the photocatalytic hydrogen evolution ***,a unique one-dimensional(1D)/two-dimensional(2D)S-scheme heterojunction containing 1D Sb_(2)S_(3) nanorods and 2D ZnIn_(2)S_(4) with affluent sulfur vacancies(denoted as Sv-ZnIn_(2)S_(4)@Sb_(2)S_(3)) was *** introduced sulfur vacancy can promote the effective adsorption of H+for the following interfacial hydrogen-evolution ***,the larger contact area and stronger electron interaction between Sb_(2)S_(3) and ZnIn_(2)S_(4) effectively inhibits the recombination of photo-generated electron–hole pairs and abridges the migration distance of *** a result,the optimal Sv-ZnIn_(2)S_(4)@Sb_(2)S_(3) sample achieves H_(2) evolution activity of 2741.3 mol·h^(−1)·g^(−1),which is 8.6 times that of pristine ZnIn_(2)S_(4) and 3.0 times that of the Sv-ZnIn_(2)S_(4) *** on the experimental result,the photo-reactivity S-scheme mechanism of hydrogen evolution from water splitting with Sv-ZnIn_(2)S_(4)@Sb_(2)S_(3) is *** work provides an effective method for developing S-scheme heterojunction composites of transition metal sulfide with high hydrogen evolution performance.

关键词： ZnIn_(2)S_(4) nanosheets S-scheme heterojunction sulfur vacancy Charge transfer and separation Photocatalytic H_(2)evolution

Enhanced mobility of MoS_(2) field-effect transistors by combining defect passivation with dielectric-screening effect

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第1期30卷 545-550页

作者： Zhao Li Jing-Ping Xu Lu Liu Xin-Yuan Zhao School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

A facile method of combining the defect engineering with the dielectric-screening effect is proposed to improve the electrical performance of MoS_(2) transistors. It is found that the carrier mobility of the transistor after the sulfur treatment on the MoS_(2) channel is greatly enhanced due to the reduction of the sulfur vacancies during vulcanization of MoS_(2).Furthermore, as compared to those transistors with HfO2 and SiO2 as the gate dielectric, the Al2O3-gate dielectric MoS_(2) FET shows a better electrical performance after the sulfur treatment, with a lowered subthreshold swing of 179.4 m V/dec,an increased on/off ratio of 2.11 × 10^(6), and an enhanced carrier mobility of 64.74 cm^(2)/V·s(about twice increase relative to the non-treated MoS_(2) transistor with SiO2 as the gate dielectric). These are mainly attributed to the fact that a suitable k-value gate dielectric can produce a dominant dielectric-screening effect overwhelming the phonon scattering, increasing the carrier mobility, while a larger k-value gate dielectric will enhance the phonon scattering to counteract the dielectricscreening effect, reducing the carrier mobility.

关键词： MoS_(2)transistor sulfur vacancy high-k dielectric mobility

Regulation of sulfur vacancies in vertical nanolamellar MoS_(2)for ultrathin flexible piezoresistive strain sensors

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第10期141卷 56-65页

作者： Xing Pang Qi Zhang Yulong Zhao Xiaoya Liang Lukang Wang Yiwei Shao State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

Magnetron-sputtered MoS_(2) has applications in piezoresistive functional materials research owing to its unique ***,the controlled incorporation of sulfur vacancies and realization of en-hanced piezoresistive performance remain significant *** this work,the direct growth of large-area MoS_(2) films with tunable sulfur vacancy concentrations was successfully achieved via magnetron sputtering at various *** analysis revealed that the application of strain al-tered the number of conductive channels between the vertical MoS_(2) nanosheets,changing the measured resistance and leading to excellent piezoresistive *** importantly,the unsaturated electrons due to the sulfur vacancies increased the in-plane carrier concentration of the MoS_(2)nanosheets.A de-position temperature of 50℃afforded the highest concentrations of sulfur vacancies and *** MoS_(2)films possessed a carrier concentration of 6.58×10^(17)cm^(−3),which was 40.9%higher than that ob-tained at 150°C,and displayed superior piezoresistive *** films exhibited high gage factors of 2.66 and 23.22 under tensile and compressive strain of≤0.29%,*** values were 118%and 323%higher,respectively,than those obtained for films deposited at 150°*** work provides an effective route for modulating and mass producing MoS_(2)-based piezoresistive electronic devices.

关键词： MoS_(2) sulfur vacancy Electron transport Piezoresistance Sensors

Defect engineering in Co-doped Ni_(3)S_(2) nanosheets as cathode for high-performance aqueous zinc ion battery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第23期118卷 199-207页

作者： Xiaojuan Li Shunshun Zhao Guangmeng Qu Xiao Wang Peiyu Hou Gang Zhao Xijin Xu School of Physics and Technology University of JinanJinan 250022China School of Electronic and Information Engineering(Department of Physics) Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

With the merits of low cost,environmental benignity,and high safety,aqueous zinc ion batteries(AZIBs)have great potential in the field of energy *** this paper,we craft a Co-doped Ni3 S2 with abundant sulfur vacancies as effective cathode materials(Co-Ni_(3) S_(2-x)) for AZIBs by hydrothermal and chemical reduction ***,cobalt doping and abundant sulfur vacancies can effectively increase the conductivity and the number of active sites for electrochemical reactions,which gives the Co-Ni_(3) S_(2-x) electrode the outstanding capability to energy *** coupling Co-Ni_(3) S_(2-x) cathode with Zn anodes to assemble alkaline AZIBs,the Co-Ni_(3) S_(2-x)//Zn full battery exhibits excellent specific capacity(183.9 mAh g^(-1) at 1 A g^(-1),based on cathode mass) and extraordinary cycling durability(72.9% capacity retention after 6000 cycles).First-principles calculations based on density functional theory(DFT) confirm that the Co-Ni_(3) S_(2-x) electrode has strong energy storage capacity and electrochemical *** results provide an extremely significant reference in designs of self-supported bimetallic sulfide nanosheets,which have promising applications in high-performance energy storage devices.

关键词： Zinc ion battery Metal doping sulfur vacancy Ni_(3)S_(2)

Engineering sulfur vacancies for boosting electrocatalytic reactions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第9期34卷 34-44页

作者： Xianxu Chu Yueyu Liao Lu Wang Junru Li Hui Xu Henan Key Laboratory of Biomolecular Recognition and Sensing College of Chemistry and Chemical EngineeringShangqiu Normal UniversityShangqiu 476000China Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterChangzhou UniversityChangzhou 213164China

Transition metal sulfides are demonstrated to play an increasingly important role in boosting the deployment of ecofriendly electrocatalytic energy conversion *** is also widely recognized that the introduction of vacancies is now becoming an important and valid approach to promote the electrocatalytic *** this review,the significance of sulfur vacancies on the enhancement of catalytic performance via four main functionalities,including tuning the electronic structure,tailoring the active sites,improving the electrical conductivity,and regulating surface reconstruction,is comprehensively *** effective strategies for the sulfur vacancy engineering,such as plasma treatment,heteroatom doping,and chemical reduction are also comprehensively ***,recent achievements in sulfur vacancy fabrication on various hotspot electrocatalytic reactions are also systematically ***,a summary of the recent progress and challenges of this interesting field are organized,which hopes to guide the future development of more efficient metal sulfide electrocatalysts.

关键词： sulfur vacancy Electrocatalytic reactions Functionalities Surface properties Energy conversion

Interfacial charge redistribution to promote the catalytic activity of Vs-CoP-CoS_(2)/C n-n heterojunction for oxygen evolution

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 611-616页

作者： Jiawen Sun Hui Xue Jing Sun Niankun Guo Tianshan Song Yi-Ru Hao Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Modulating surface charge redistribution based on interface and defect engineering has been considered as a resultful means to boost electrocatalytic ***,the mechanism of synergistic regulation of heterojunction and vacancy defects remains ***,a Vs-CoP-CoS_(2)/C n-n heterojunction with sulfur vacancies is successfully constructed,which manifests superior electrocatalytic activity for oxygen evolution,as demonstrated by a low overpotential of 170 mV to reach 10 mA/cm^(2).The experimental results and density functional theory calculations testify that the outstanding OER performance of Vs-CoP-CoS_(2)/C heterojunction is owed to the synergistic effect of sulfur vacancies and built-in electric field at n-n heterogeneous interface,which accelerates the electron transfer,induces the charge redistribution,and regulates the adsorption energy of active intermediates during the *** study affords a promising means to regulate the electrocatalytic performance by the construction of heterogeneous interfaces and defects,and in-depth explores the synergistic mechanisms of n-n heterojunction and vacancies.

关键词： Charge redistribution n-n Heterojunction Built-in electric field sulfur vacancy Oxygen evolution reaction

Surface sulfur vacancies enhanced electron transfer over Co-ZnS quantum dots for efficient degradation of plasticizer micropollutants by peroxymonosulfate activation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第8期33卷 3829-3834页

作者： Yuting Gu Tingting Gao Fagen Zhang Chao Lu Wenrui Cao Ziwei Fu Chun Hu Lai Lyu Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationInstitute of Environmental Research at Greater BayGuangzhou UniversityGuangzhou 510006China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China Institute of Rural Revitalization Guangzhou UniversityGuangzhou 510006China

Peroxymonosulfate(PMS)activation in heterogeneous processes is a promising water treatment ***,the high energy consumption and low efficiency during the reaction are ineluctable,due to electron cycling rate ***,a new strategy is proposed based on a quantum dots(QDs)/PMS ***-ZnS QDs are synthesized by a water phase coprecipitation *** inequivalent lattice-doping of Co for Zn leads to the generation of surface sulfur vacancies(SVs),which modulates the surface of the catalyst to form an electronic nonequilibrium ***,the plasticizer micropollutants can be completely degraded within only tens of seconds in the Co-Zn S QDs/PMS system due to this type of surface *** interfacial reaction mechanism is revealed that pollutants tend to be adsorbed on the cobalt metal sites as the electron donors,where the internal electrons of pollutants are captured by the metal species and transferred to the surface ***,PMS adsorbed on the SVs is reduced to radicals by capturing electrons,achieving effective electron *** oxygen(DO)molecules are also easily attracted to catalyst defects and are reduced to O_(2)^(·-),further promoting the degradation of pollutants.

关键词： Peroxymonosulfate activation sulfur vacancy Quantum dots ZnS Plasticizer