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The modulation of catalytic active site and support to construct high-efficiency ZnS/NC-X electrocatalyst for nitrogen reduction

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Nano Research 2022年第9期15卷 7903-7909页

作者： Peng wang Sijia Zhao Zijing Liu Caiyun Han Shuang wang Jinping Li College of Environmental Science and Engineering Taiyuan University of TechnologyJinzhong 030600China Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization Taiyuan University of TechnologyTaiyuan 030024China

Transition metals are a kind of promising catalysts to apply into electrocatalytic synthesis ammonia by virtue of abundant reserves and low ***,many widely used transition metal catalysts usually face the challenge to realize satisfactory catalytic results mainly resulting from the match between catalytic active site and ***,a new-type ZnS/NC-X electrocatalyst was reported by in-situ sulfidation of zeolitic imidazolate framework-8(ZIF-8),where the metal nodes of ZIF-8 reacted with dibenzyl disulfide(BDS)to obtain ZnS nanoparticles and the framework of ZIF-8 was carbonized to form the ***,catalytic active sites(ZnS nanoparticles)and support(NC-X)were adjusted in detailed by changing the ratio of ZIF-8 and *** a result,when the mass ratio of ZIF-8 and BDS was 1:1,the resulted ZnS/NC-2 catalyst achieved a remarkable NH3 yield of 65.60μg·h^(−1)·mg^(−1)cat.,Faradaic efficiency(FE)of 18.52%at−0.4 V vs reversible hydrogen electrode(RHE)in 0.05 M H2SO4 and catalytic stability,which outperformed most reported transition metal *** matching catalytic active site and support make our strategy promising for wide catalytic applications.

关键词： ZnS/NC-X electrocatalyst nitrogen reduction reaction support catalytic active site

One-step synthesis of hollow PEI-NaBiF4:Yb^3+/Er^3+upconversion nanoparticles for water-responsive luminescent probe

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Journal of Rare Earths 2020年第4期38卷 362-368页

作者： Zaifa Pan Yingting Wen Tao wang Kai wang Yuanjie Teng Kang Shao College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310000China

Novel PEI-modified NaBiF4:Yb3+/Er3+upconversion nanoparticles(UCNPs)with hollow structure were prepared by a surface modification free one-step solvothermal method and applied as a luminescent probe to determinate water content in organic ***,SEM and HRTEM results demonstrate that the obtained PEI-NaBiF4:Yb3+/Er3+UCNPs are pure hexagonal phase with uniform *** successful modification of PEI on the UCNPs surface was evidenced byζ-potential test,XPS and TG *** synthesized UCNPs are disintegrated into smaller nanoparticles in the presence of water and thus result in a surface quenching effect,which show the features of 0-100%wide range water response in various organic *** sensing performance towards real samples was validated by the water content determination in beer,rum and white ***,the luminescence intensity variation of the PEI-modified NaBiF4:Yb3+/Er3+enable the test visualization and ease of portability.

关键词： Luminescent probe Upconversion nanoparticles Water detection Organic solvents Rare earths

Experimental and measured research on three-dimensional deformation law of gas drainage borehole in coal seam

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International Journal of Mining Science and Technology 2020年第3期30卷 397-403页

作者： Hongbao Zhao Jinyu Li Yihong Liu Yikuo wang Tao wang Hui Cheng College of Energy and Mining China University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

Using self-researched gas drainage borehole stability dynamic monitoring device, three-dimensional deformation characteristics of borehole under steady vertical load were researched experimentally and systematically. This research indicated that under the action of steady loading, the mechanical deformation path of the simulated gas drainage borehole is gradually complicated, and the decay of the borehole circumferential strain is an important characterization of the prediction and early warning of borehole instability and collapse. The horizontal position of borehole occurs compressive strain, and the vertical of which occurs tensile strain under the action of vertical stress. At the initial stage of loading, the vertical strain is more sensitive than that in the horizontal direction. After a certain period of time, the horizontal strain is gradually higher than the vertical one, and the intersection of the borehole horizontal diameter and the hole wall is the stress concentration point. With the increase of the depth of hole, the strain shows a gradual decay trend as a whole, and the vertical strain decays more observably, but there is no absolute position correlation between the amount of strain decay and the increase in borehole depth,and the area within 1.5 times the orifice size is the borehole stress concentration zone.

关键词： Gas drainage borehole Dynamic monitoring Strain-time curve Three-dimensional deformation law

On demand bidirectional shape transformations and novel chiral actuators of photomediated shape memory polymer film based on photothermal OEGy-W_(18)O_(49)nanowires

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Science China(Technological Sciences) 2023年第12期66卷 3585-3595页

作者： TIAN GuangMing wang Bo HE XinHai wang Chen YANG Dong MA JianHua Department of Polymer Materials and Engineering School of Materials EngineeringXi’an Polytechnic UniversityXi’an 710048China Xi’an Aerospace Chemical Propulsion Factory Co.Ltd. Xi’an 710025China

The spatially controllable shape-shifting behaviors of a planar two-dimensional(2D)film to three-dimensional(3D)shapes upon external stimuli are of paramount significance for the development of smart ***,the present work focuses on fabricating plain film whose shape can be remotely and spatially transformed into various 3D configurations via the formation of a laser-induced temperature gradient;when subjected to laser irradiation,the prestretched hybrid films exhibit out-of-plane bending behavior owing to anisotropic chain relaxation and strain energy *** this basis,various sophisticated shape transformations can be achieved by site-specific irradiations of laser with a controllable ***,shape morphing involving reversible bending transformations can also be realized by employing the laser on the corresponding opposite side of the hybrid ***,under a 160 mW/cm^(2) simulated sunlight illumination,the transformation of flat 2D film into 3D chiral actuators is driven by material anisotropy and geometrical heterogeneity of a bilayer strip design,and it yields right and left-handed helix,the morphologies of the helix shape can be precisely tailored by the strip angles and strain values.

关键词： shape-shifting temperature gradient out-of-plane bending chiral actuators anisotropy

Advanced oxidative degradation of sulfamethoxazole by using bowl-like FeCuS@Cu_(2)S@Fe^(0) catalyst to efficiently activate peroxymonosulfate

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Journal of Environmental Sciences 2023年第4期126卷 348-364页

作者： Xiaobo wang Yu Zhou Sylvestre Ndayiragije Nan wang Heqing Tang Lihua Zhu College of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China College of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi 435003China Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education Hubei ProvinceCollege of Resources and Environmental ScienceSouth-Central University for NationalitiesWuhan 430074China

A novel hierarchical bowl-like FeCuS@Cu_(2)S@Fe^(0)nanohybrid catalyst(B-FeCuS@Cu_(2)S@Fe^(0))was synthesized for removing sulfamethoxazole(SMX) through catalytic activation of peroxymonosulfate(PMS). It was found that this catalyst exhibited excellently high catalytic activity. Under optimized reaction conditions, all the added SMX(12 mg/L) could be completely degraded within 5 min. The SMX degradation followed pseudo first order kinetics with a rate constant k of 0.89 min^(-1), being 1.38, 4.51, 8.99 and 35.6 times greater than that of other catalysts including Fe^(0)(0.644 min^(-1)in the very initial stage), bowl-like iron-doped CuS(B-FeCuS, 0.197 min^(-1)), bowl-like CuS(B-CuS, 0.099 min^(-1)) and Cu_(2)O(0.025 min^(-1)), respectively. During the degradation, several reactive oxygen species(·OH, SO_(4)·-and1O_(2)) were generated with ·OH as the main one as confirmed by electron paramagnetic resonance analysis. The SMX degradation in the present system included both radical and non-radical mediated processes. A possible mechanistic insight of the PMS activation by bowl Fe^(0)decorated CuS@Cu_(2)S-based catalyst was proposed according to X-ray photoelectron spectroscopic(XPS) analysis, and the degradation pathway of SMX was speculated by monitoring the degradation intermediates with liquid chromatography coupled with mass spectrometry(LC-MS).

关键词： Sulfamethoxazole Peroxymonosulfate Sulfide catalyst Degradation Reactive oxygen species

System-size effect on the friction at liquid-solid interfaces

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 471-478页

作者： Liang ZHAO Jiajia SUN Xian wang Li ZENG Chunlei wang Yusong TU College of Physical Science and Technology Yangzhou UniversityYangzhou 225009Jiangsu ProvinceChina School of Physics and Electronics Nanning Normal UniversityNanning 530023China Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China

The friction at the liquid-solid interfaces is widely involved in various phenomena ranging from nanometer to micrometer scales. By the molecular dynamic(MD)simulation, the friction properties of liquid-solid interfaces at the molecular level are calculated via the Green-Kubo relation. It is found that the system size will influence the value of the friction coefficient, especially for the solid surfaces with the larger polar charge. The value of the friction coefficient decreases with the increase in the system size and converges at large system sizes. The large polar charge will lead to a significant friction coefficient. However, the diffusion of water molecules on this surface is almost a constant, indicating that the diffusion coefficient seems to be independent of the system size and polar charge. This work provides insights for the selection of the system size in modeling the frictional properties of hydrophobic/hydrophilic surfaces.

关键词： Green-Kubo relation liquid-solid interface system-size effect friction coefficient

The adsorption effect of aquaculture residual feed on heavy metals and its impact on microbial metabolism of feed

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Ecological Processes 2024年第2期13卷 246-259页

作者： Sufeng wang Zijng wang Wen Zhang Jingshan Li Mingyang Lin Li Chen State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse Yanshan University Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province College of Biology and Environmental EngineeringZhejiang Shuren University Hebei Ocean & Fisheries Science Research Institute

Background Intensive and large-scale aquaculture has a high biological density, and a large amount of artificial feed must be provided. As a result, residual feed would be discharged into natural water bodies with water exchange. Due to heavy metal pollution in surface water, residual feed may adsorb heavy metals in the water, affecting the subsequent microbial degradation of feed and the restoration of the water environment. The combined ecological impacts of these two types of pollution urgently need to be *** This study explored the adsorption effect of residual feed on heavy metals and its impact on microbial degradation of residual feed. The results showed that both the insoluble component（mainly fiber, ash, and ether extract, abbreviated as FAE） and soluble component（soluble protein and starch） of the feed had adsorption effects on heavy metals. As the salinity increased, the adsorption capacity of Cu2+and Cd2+decreased, while the adsorption effect on Pb2+was not changed significantly. The adsorption of heavy metals by residual feed could affect the biological degradation of residual feed. The residual feed could adsorb heavy metals and bacterial cells simultaneously, forming FAE-B（bacteria）-S（starch）-Pr（protein）-metal adsorption complex. This adsorption effect could reduce the negative impact of heavy metals on microbial degradation of residual feed. The simulated degradation experiments in actual water bodies also confirmed this. However, the accumulation of heavy metals in residual feed may bring negative effects, such as being consumed by aquatic organisms and entering the food *** The results of this study provide a basis for the collection and centralized treatment of residual feed in aquaculture, as well as the control and remediation of residual feed pollution in natural water bodies.

关键词： Residual feed Adsorption complex Feed pollution Heavy metal

A cation-dipole-reinforced elastic polymer electrolyte enabling long-cycling quasi-solid-state lithium metal batteries

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Journal of Energy Chemistry 2022年第12期75卷 340-348,I0009页

作者： Zhuyi wang Yiming wang Pan Zhai Preeyaporn Poldorn Siriporn Jungsuttiwong Shuai Yuan Research Centre of Nanoscience and Nanotechnology Shanghai UniversityShanghai 200444China Center for Organic Electronic and Alternative Energy Department of Chemistry and Center of Excellence for Innovation in ChemistryFaculty of ScienceUbon Ratchathani UniversityUbon Ratchathani 34190Thailand

The application of ionic liquids(IL)in polymer electrolytes represents a safer alternative to the currently used organic solvents in lithium batteries due to their nonflammability and thermal ***,as a plasticizer,it is generally agreed that the introduction of ionic liquid usually leads to a trade-off between ion transport and mechanical properties of polymer *** we report the synthesis of an IL-embedded polymer electrolyte with both high ionic conductivity(2.77×10^(-4)S cm^(-1)at room temperature)and excellent mechanical properties(high tensile strength up to 11.4 MPa and excellent stretchability of 387%elongation at break)achieved by strong ion–dipole interactions between polymer electrolyte components,which was unveiled by the DFT ***,this polymer electrolyte also exhibits nonflammability,good thermal stability and the ability to recover reversibly from applied stress,i.e.,excellent *** highly viscoelastic polymer electrolyte enables tight interfacial contact and good adaptability with electrodes for stable lithium stripping/plating for 2000 h under a current density of 0.1 mA cm^(-2).By coupling with this polymer electrolyte,the LiFePO_(4)/Li cells exhibit outstanding cycling stability at room temperature as well as the reliability under extreme environmental temperature or being abused.

关键词： Elastic polymer electrolyte Ion-dipole interactions High tensile strength Quasi-solid-state lithium battery Long cycling

Activating copper oxide for stable electrocatalytic ammonia oxidation reaction via in-situ introducing oxygen vacancies

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Nano Research 2022年第7期15卷 5987-5994页

作者： Jingjing Huang Zhe Chen Jinmeng Cai Yongzhen Jin Tao wang Jianhui wang Department of Chemistry Zhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Center of Artificial Photosynthesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China School of Science Westlake Institute for Advanced StudyHangzhou 310024China

Electrocatalytic ammonia oxidation reaction(EAOR)provides an ideal solution for on-board hydrogen supply for fuel cells,while the lack of efficient and durable EAOR catalysts has been a long-standing obstacle for its practical ***,we reported that the defect engineering via in-situ electrochemically introducing oxygen vacancies(Vo)not only turns the inactive CuO into efficient EAOR catalyst but also achieves a high stability of over 400 h at a high current density of~200 mA·cm^(−2).Theoretical simulation reveals that the presence of Vo on the CuO surface induces a remarkable upshift of the d-band center of active Cu site closer to the Fermi level,which significantly stabilizes the reaction intermediates(*NHx)and efficiently oxidizes NH3 into *** Vo-modulated CuO shows a different catalytic mechanism from that on the conventional Pt-based catalysts,paving a new avenue to develop inexpensive,efficient,and robust catalysts,not limited to EAOR.

关键词： electrocatalysis ammonia oxidation reaction oxygen vacancy CuO stability