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Investigation of MXenes as oxygen reduction electrocatalyst for selective h_(2)O_(2) generation

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Nano Research 2022年第5期15卷 3927-3932页

作者： Xiao huang Min Song Jian Zhang Jingjing Zhang Wei Liu chang Zhang Wang 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 430074China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China

two-electron oxygen reduction reaction(ORR)catalysts are essential for the electrosynthesis of hydrogen peroxide(h_(2)O_(2)).MXenes,a rising family of two-dimensional(2D)transition metal carbides,have been extensively studied for energy storage and(photo)electrocatalysis due to their rich chemical compositions and tunable electronic *** this work,three representative MXenes of ti_(3)C_(2)t_(x),V_(2)CtX,and Nb_(2)CtX were selected for h_(2)O_(2)electrosynthesis and we found that MXenes are inherent two-electron ORR catalysts with high h_(2)O_(2)*** addition,this work critically evaluates their electrocatalytic activity and ***,Nb_(2)Ct_(x)catalyst maintains better electrocatalytic activity and higher stability for a long time test,although the stability of ti_(3)C_(2)t_(x)and V_(2)Ct_(x)catalysts is poor owing to the metal dissolution property of ti and V in alkaline ***,the assembled device based on Nb2Ctx catalyst presents a high h2O2 production and a rapid organic dye decoloration ability.

关键词： electrosynthesis hydrogen peroxide oxygen reduction reaction MXenes

rac-11-t-Butoxy-1,4-dihydro-1,4-methanoanthracene:A two-dimensional framework structure built from C-h…O and C-h…π hydrogen bonds

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Chinese Chemical Letters 2012年第9期23卷 1043-1046页

作者： hsing Yang tsai Ming Jen chang tzu Chien Fang Kew Yu Chen Department of Chemical Engineering Feng Chia University40724 TaichungTaiwan

the title compound rac-11-t-butoxy-l,4-dihydro-l,4-methanoanthracene （C19h200, Mr = 264.35） has been synthesized and characterized by Ft-IR, 1h NMR, hRMS spectra and single-crystal X-ray diffraction. the crystal belongs to monoclinic, space group P21/n, with a = 13.5240（10）, b = 8.3453（6）, c = 13.9604（9） A,β = 100.0190（10）°. the structure of the title compound comprises a norbornene unit with a t-butoxy g, roup, having a naphthalene ring fused on one side. the naphthalene is essentially planar with a maximum deviation of 0.032（2） A for atom C（3）. In the crystal, inversion-related molecules are linked by pairs of C- h...O hydrogen bonds, forming a cyclic dimer with R2z （16） graph-set motif. the C-h-..~r interactions are also observed, linking the molecules into a continuous two-dimensional framework structure.

关键词： X-ray diffraction Norbomene derivatives Crystal structure Puckering parameters

Apoptosis induced by nucleosides in the human hepatoma hepG2

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World Journal of Gastroenterology 2005年第40期11卷 6381-6384页

作者： Suh-Ching Yang Che-Lin Chiu Chi-chang huang Jiun-Rong Chen School of Nutrition and health Sciences

AIM： to investigate the apoptotic effects of nucleosides on the human hepatoma hepG2. MEthODS： the nucleosides included inosine （I）, cytidine （C）, uridine （U）, thymidine （t）, adenosine （A）, and guanosine （G）. Cells were incubated by the mediums with or without nudeosides at 37 ℃ in a 50 mL/L CO2 humidified atmosphere. RESULtS： It was found that the cell viabilities were significantly decreased, when cells were treated with 30 mmol/L I, 30 mmol/L C, 30 mmol/L U, 30 mmol/L t, 0.5 mmol/L A, and 0.5 mmol/L G after 12 h incubation （P〈0.05）. About the apoptotic phenomenon, the cell percentages of sub-G1 cells were significantly increased in the mediums containing nucleosides such as C, U, t, A, and G （P〈0.05）. Furthermore, the caspase-3 activity was increased, when the cells were incubated with t （P〈0.05）. the protein expressions of p53 and p21 showed no difference in each group. to investigate the mechanism of apoptosis induced by nucleosides, it was found that the contents of soluble Fas ligand contents were increased in hepG2 cells following I, U, t, and A treatment （P〈0.05）. But, tNF-α and cytochrome cwere undetectable. CONCLUSION： thymidine may induce the apoptosis in hepG2, but the effective dosages and reactive time must be investigated in the future study. however, the apoptosis-inducing abilities of other nucleosides were still unclear in this study.

关键词： Apoptosis Nucleoside, hepG2

Bandgap opening in Mote2 thin flakes induced by surface oxidation

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Frontiers of physics 2020年第3期15卷 105-111页

作者： Yuan Gan Jiyuan Liang chang-woo Cho Si Li Yanping Guo Xiaoming Ma Xuefeng Wu Jinsheng Wen Xu Du Mingquan he chang Liu Shengyuan A.Yang Kedong Wang Liyuan Zhang National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Department of Physics Southern University of Science and TechnologyShenzhen518055China School of Physics and Electronics Hunan Normal UniversityChangsha410081China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore487372Singapore Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190China Department of Physics and Astronomy Stony Brook UniversityStony BrookNY11794USA Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing UniversityChongqing401331China

Recently,the layered transition metal dichalcogenide 1t′-Mote2 has generated considerable interest due to their superconducting and non-trivial topological ***,we present a systematic study on 1t′-Mote2 single-crystal and exfoliated thin-flakes by means of electrical transport,scanning tunnelling microscope(StM)measurements and band structure *** a bulk sample,it exhibits large magneto-resistance(MR)and Shubnikov–de hass oscillations inρxx and a series of hall plateaus inρxy at low ***,the Mote2 thin films were intensively investigated with thickness *** samples,without encapsulation,an apparent transition from the intrinsic metallic to insulating state is observed by reducing *** such thin films,we also observed a suppression of the MR and weak anti-localization(WAL)*** attributed these effects to disorders originated from the extrinsic surface chemical reaction,which is consistent with the density functional theory(DFt)calculations and in-situ StM *** contrast to samples without encapsulated protection,we discovered an interesting superconducting transition for those samples with hexagonal Boron Nitride(h-BN)film *** results indicate that the metallic or superconducting behavior is its intrinsic state,and the insulating behavior is likely caused by surface oxidation in few layer 1t’-Mote2 flakes.

关键词： two-dimensional materials metal-insulator transition layered transition metal dichalcogenides(tMDs) surface oxidation

In situ formed LiF-Li_(3)N interface layer enables ultra-stable sulfide electrolyte-based all-solid-state lithium batteries

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Journal of Energy Chemistry 2023年第4期79卷 272-278页

作者： Ming Wu Mengqi Li Yuming Jin Xinshuang chang Xiaolei Zhao Zhi Gu Gaozhan Liu Xiayin Yao School of Material Science and Chemical Engineering Ningbo UniversityNingbo 315211ZhejiangChina Ningbo Institute of Materials technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Sulfide solid electrolytes are promising for high energy density and safety in all-solid-state batteries due to their high ionic conductivity and good mechanical ***,the application of sulfide solid electrolytes in all-solid-state batteries with lithium anode is restricted by the side reactions at lithium/electrolytes interfaces and the growth of lithium dendrite caused by nonuniform lithium ***,a homogeneous LiF-Li_(3)N composite protective layer is in situ formed via a manipulated reaction of pentafluorobenzamide with Li *** LiF-Li_(3)N layer with both high interfacial energy and interfacial adhesion energy can synergistically suppress side reactions and inhibit the growth of lithium dendrite,achieving uniform deposition of *** critical current densities of Li_(10)GeP_(2)S_(12)and Li_(6)PS_(5)Cl are increased to 3.25 and 1.25 mA cm^(-2)with Li@LiF-Li_(3)N layer,which are almost triple and twice as those of Li-symmetric cells in the absence of protection layer,***,the Li@LiF-Li_(3)N/Li10GeP2S12/Li@LiF-Li_(3)N cell can stably cycle for 9000 h at 0.1 mA cm^(-2)under 0.1 mA h cm^(-2),and Li@LiF-Li_(3)N/Li_(6)PS_(5)Cl/Li@LiF-Li_(3)N cell achieves stable Li plating/stripping for 8000 h at 0.1 mA cm^(-2)under10 m A h cm^(-2).the improved dynamic stability of lithium plating/stripping in Li@LiF-Li_(3)N/Li_(10)GeP_(2)S_(12)or Li_(6)PS_(5)Cl interfaces is proved by three-electrode *** a result,LiCoO_(2)/electrolytes/Li@LiF-Li_(3)N batteries with Li_(10)GeP_(2)S_(12)and Li_(6)PS_(5)Cl exhibit remarkable cycling stability of 500 cycles with capacity retentions of 93.5%and 89.2%at 1 C,respectively.

关键词： LiF-Li_(3)N Sulfide solid electrolytes Interface modification high interface energy All-solid-state batteries

Facile synthesis of zinc-based organic framework for aqueous hg (Ⅱ) removal: Adsorption performance and mechanism

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Nano Materials Science 2021年第4期3卷 429-439页

作者： Biao Zeng Wei Wang Sijin he Guo Lin Wenjia Du Jun chang Zhao Ding the State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081PR China Key Laboratory for Ferrous Mtallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081PR China China E-port Data Center Division of Chengdu Chengdu610041PR China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College London(UCL)LondonWC1E 68TUK College of Material and Chemical Engineering tongren University Tongren554300GuizhouPR China Department of Mechanical Materials and Aerospace Engineering Illinois Institute of TechnologyChicagoIL60616 USA

Mercury(hg)ions can lead to a serious impact on the environment;therefore,it was necessary to find an effective method for absorbing these toxic hg ***,the adsorbent(Zn-AhMt)was synthesized from zinc nitrate and 4-amino 3-hydrazine-5 mercapto-1,2,4-triazole(AhMt)by one-step method and,characterized the microstruc-ture and absorption performance by fourier transform infrared spectroscopy(FtIR),field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),Brunauer-Emmett teller(BEt),thermal Gravimetric Analyzer(tGA)and X-ray photoelectron spectroscopy(XPS).through a plethora of measurements,we found that the maximum adsorption capacity was 802.8 mg/g when the optimal ph of Zn-AhMt was *** isothermal and kinetic experiments confirm that the reaction process of Zn-AhMt was chemisorption,while the adsorption process conforms to the hill model and pseudo second order kinetic *** experiments showed that the adsorption process was spontaneous and *** experiments were performed in the simulated wastewater containing Mn,Mg,Cr,Al,Co,Ni,hg *** results showed that the Zn-AhMt has a stronger affinity for hg *** removal rate of Zn-AhMt remained above 98%,indicating that the Zn-AhMt had a good stability validated by three adsorption-desorption repeatable *** to the XPS results,the adsorption reaction of Zn-AhMt was mainly attributed to the chelation and ion *** was further explained by both density functional theory(DFt)calculation and frontier molecular orbital *** therefore propose the adsorption mechanism of *** adsorption reaction facilitates via the synergistic action of S and N ***,the bonding between the adsorbent and the N atom has been proved to be more *** study demonstrated that Zn-AhMt had a promising application prospect in mercury removal.

关键词： Metal-organic frameworks(MOFs) hg(Ⅱ) Selectivity Adsorption mechanism

A New Family of SO_(4)^(2–)-templated 3d-4f high-Nuclearity Clusters:Syntheses,Structures,and Magnetic Properties

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Chinese Journal of Chemistry 2024年第20期42卷 2438-2444页

作者： Caihong Fan Kaipeng Bai Qiancheng Luo tian han chang huang Yanzhen Zheng Weipeng Chen Frontier Institute of Science and technology State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Key Laboratory of ElectronicDevicesandMaterials ChemistrySchoolof ChemistryInstrumentAnalysis CenterXi'an JiaotongUniversityXi'an Shaanxi 710049China

the precise syntheses of transition-rare-earth metal clusters with desired structures remain a great ***,by utilizing SO_(4)^(2-)anion released by in-situ decomposition of sodium dodecyl sulfate(SDS)as a template,a series of novel high-nuclearity 3d-4f clusters,formulated as[Ni_(24)Pr_(22)(μ_(3)-Oh)_(31)(pida)_(24)(SO_(4))_(4)(NO_(3))_(9)(Ch_(3)COO)_(3)]·Br_(4)·(NO_(3))_(11)·_(16)h_(2)O·25Ch_(3)Oh(1,h_(2)pida=N-phenyliminodiacetic acid),[Ni_(24)Nd_(22)(μ3-Oh)_(31)(pida)_(24)(SO_(4))_(4)(NO_(3))_(9)(Ch_(3)COO)_(3)]·Br_(4)·(NO_(3))_(11)·14h_(2)O·24Ch_(3)Oh(2)and[Ni_(24)Gd_(22)(μ3-Oh)_(36)(bida)_(24)(SO_(4))_(7)(NO_(3))_(3)(Ch_(3)COO)_(3)]·(SO_(4))·Br_(4)·(NO_(3))_(4)·31h_(2)O·32Ch_(3)Oh(3,h_(2)bida=N-benzyliminodiacetic acid),have been successfully isolated.X-ray crystal structure analyses reveal that all the cationic{Ni_(24)RE_(22)}cores in 1-3 possess a ball-like structure with C_(3v)symmetry,and can be viewed as consisting of an inner{RE_(22)}core and an outer{Ni_(24)}*** 1 and 2 to 3,due to the lanthanide contraction effect,the coordination numbers for rare-earth metal centers in{RE_(22)}are different,resulting in different number of SO_(4)^(2-)and NO_(3)^(-)anions to support and stabilize the skeleton ***,the magnetic properties of complexes 1-3 were also *** result revealed that complexes 1-3 show antiferromagnetic/ferrimagnetic interactions,and 3 exhibits magneto-caloric effect at ultralow temperatures with a maximum-ΔSm(magnetic entropy change)value of 33.03 J·kg^(−1)·K^(−1)at 3.0 K and 7 t.

关键词： transition-Rare-earth metal Cluster Anionic template Magnetic exchange Magnetic refrigeration

Effects of elemental Sn on the properties and inclusions of the free-cutting steel

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 141-148页

作者： Shao-chun Chen Rong Zhu Li-qiu Xue teng-chang Lin Jing-she Li Yang Lin School of Mechanical Engineering and Automation Fuzhou University School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

A new environment-friendly free-cutting steel alloyed with elemental Sn （Y20Sn） was developed to meet the requirements of machinability and mechanical properties according to GB/t8731--1988. the machinability of the steel is enhanced by the segregation of elemental Sn at grain boundaries. the effect of Sn segregation on intergranular brittle fracture at normal cutting temperature from 250℃ to 400℃ is confirmed. the formation mechanism of main inclusions MnS is influenced by the presence of Sn and the attachment of Sn around MnS itself as a surfactant, and this mechanism also explains the improvement in machinability and mechanical properties of the steel. In the steel, the relevant inclusions are mainly spherical or axiolitic, and are uniformly distributed in small volume. Such inclusions improve the machinability of the steel and do not impair the mechanical properties as well. Experimental results demonstrate that the appropriate content of Sn in the steel is 0.03wt% to 0.08wt%, and the remaining composition is close to that of standard Y20 steel.

关键词： flee-cutting steel machinability mechanical properties inclusions surfactant

Vertically aligned reduced graphene oxide/ti_(3)C_(2)t_(x)MXene hybrid hydrogel for highly efficient solar steam generation

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Nano Research 2020年第11期13卷 3048-3056页

作者： Wei Li Xiaofeng Li Wei chang Jing Wu Pengfei Liu Jianjun Wang Xi Yao Zhong-Zhen Yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China Institute of Chemistry Chinese Academy of SciencesBeijing100190China Department of Biomedical Sciences City University of Hong KongHong Kong999077China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing100029China

Effective utilization of abundant solar energy for desalination of seawater and purification of wastewater is one of sustainable techniques for production of clean water,helping relieve global water resource ***,we fabricate a vertically aligned reduced graphene oxide/ti_(3)C_(2)t_(x)MXene(A-RGO/MX)hybrid hydrogel with aligned channels as an independent solar steam generation device for highly efficient solar steam *** vertically aligned channels,generated by a liquid nitrogen-assisted directional-freezing process,not only rapidly transport water upward to the evaporation surface for efficient solar steam generation,but also facilitate multiple reflections of solar light inside the channels for efficient solar light *** deliberate slight reduction endows the RGO with plenty of polar groups,decreasing the water vaporization enthalpy effectively and hence accelerating water evaporation *** MXene sheets,infiltrated inside the A-RGO hydrogel on the basis of Marangoni effect,enhance light absorption capacity and photothermal conversion *** a result,the A-RGO/MX hybrid hydrogel achieves a water evaporation rate of 2.09 kg·m^(−2)·h^(−1)with a high conversion efficiency of 93.5%under 1-sun ***,this photothermal conversion hydrogel rapidly desalinates seawater and purifies wastewater to generate clean water with outstanding ion rejection rates of above 99%for most ions.

关键词： anisotropic hydrogel MXene reduced graphene oxide solar steam generation aligned channels