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High specific surface area porous graphene grids carbon as anode materials for sodium ion batteries

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Journal of Energy Chemistry 2019年第4期28卷 159-166页

作者： Hao Zhang Huinan Guo Aiyang Li Xiaoya Chang Song Liu Dun Liu Yijing Wang Fang Zhang Huatang Yuan College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (MOE) Nankai University School of environment and State Key Joint laboratory of environment Simulation and Pollution Control Tsinghua University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

Although great accomplishments of functional material synthesis have been achieved in sodium ion batteries(SIBs)recently,there are still numerous challenges and problems in preparing carbon-based materials with porous architectures and enough lattice distance for Na^+*** we report a templated strategy to synthesize 3D porous graphene girds(PGGs)consisting of several stacking graphene structure with ultrahigh surface area and hierarchical connected structure by employing Ag nanoparticles(NPs).The Ag NPs will regenerate for decreasing the experimental cost,also in line with principles of green chemistry and environmentally friendly *** PGGs obtain advanced specific capacity of160 m A h g^(-1)at current density of 50 m A h g^(-1).Moreover,112 mA h g^(-1)capacity can be gained at 1 A h g^(-1)during 1000 *** to their porous architecture,ultrahigh surface area and low amorphous graphited structure,PGGs electrode showed the excellent electrochemical performance in high rate capability.

关键词： Carbon-based materials Porous structure Ultrahigh surface area Ag nanoparticle Sodium ion battery

CoNi_2S_4 Microspheres Prepared by One-pot Hydrothermal Reaction as Supercapacitor

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Chinese Journal of Structural Chemistry 2019年第1期38卷 83-88,3页

作者： WU Yi-Wei HONG Zhong-Zhu ZHU Mei-Hua GUO Hong-Xu YING Shao-Ming College of Chemistry & environment Minnan Normal University Fujian Provincial Key laboratory of Featured materials in Biochemical Industry College of Chemistry and Materials Ningde Normal University

A microsphere discrete structure of CoNi_2S_4 was prepared through one-pot hydrothermal reaction and characterized by FTIR, XRD and SEM. The as-prepared CoNi_2S_4 served as a supercapacitor, showing a specific capacitance of 1129.5 F/g with over 99% coulombic efficiency at a current density of 4 A/g in 3 M KOH. And after 3000 cycles of charge and discharge tests, 92.3% of its initial capacitance can be still maintained. The results demonstrate that the material is promising as an electrode material for supercapacitors in energy storage.

关键词： microsphere discrete structure CoNi2S4 hydrothermal supercapacitor

Highly Efficient Removal of Organic Dyes by Novel As-synthesized AgBr/montmorillonite Composite

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Journal of Wuhan University of Technology(materials Science) 2019年第1期34卷 35-40页

作者： Lü Jianchang GE Ming College of Chemical Engineering North China University of Science and Technology Hebei Key laboratory of Photocatalytic and Electrocatalytic materials for environment

A facile deposition method has been developed for large-scale synthesis of visible-light-driven AgBr/montmorillonite composite catalyst for the first time. The as-synthesized samples were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR), transmission electron microscopy(TEM), UV-vis diffuse reflectance spectroscopy(UV-vis DRS) and Brunauer-Emmett-Teller(BET) surface area analysis, respectively. Through the combined action of adsorption and photodegradation, the as-prepared AgBr/montmorillonite composite exhibited a higher removal efficiency for rhodamine B(RhB) than that of Na-montmorillonite and AgBr. For the methyl orange(MO) removal, the AgBr/montmorillonite composite possessed a superior photocatalytic performance compared with Namontmorillonite and AgBr. The enhanced photocatalytic activity of AgBr/montmorillonite composite can be attributed to the effective separation of the electron-hole pairs. In AgBr/montmorillonite suspension, the superoxide radicals are the main reactive oxygen species for dye degradation under visible light illumination.

关键词： AgBr/montmorillonite adsorption photocatalysis dye photocatalytic mechanism

Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo Wei Shuai Pan Guizhen Liao Weizhou Li Yuezhou Wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Key laboratory of LCR materials and Devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the Al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the Al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening Al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

Mechanism of Ethylene Migratory Insertion and Dimerization Catalyzed by σ-Alkyl Platinum Complexes--A DFT Study

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Chinese Journal of Chemistry 2011年第6期29卷 1084-1094页

作者： Sheng, Yu Geng, Zhiyuan Wang, Yongcheng Wang, Yuzhi Sun, Xiaojian Gansu Key laboratory of Polymer materials College of Chemistry and Chemical Engineering Key Laboratory of Eco-environment-related Polymer Materials Ministry of Education Northwest Normal University Lanzhou Gansu 730070 China

The mechanism of ethylene insertion reactions catalyzed by cationic a-alkyl platinum complexes has been studied at the B3LYP level of density functional theory. The initial steps of the reactions proceed via the coordination of ethylene to the reactants L2Pt（II）R＋, where L2=none, （NH3）2, （CHNH）2; R=H, CH3, C2H5 in which ethylene coordinates strongly to the complexes PtCH＋ and PtC2H＋（coordination energies （CE） are 296.52 and 229.28 kJ/mol, respectively）, while nitrogen-containing ligands decrease the energies： Pt（NH3）2CH＋（CE： 180.04 kJ/mol）, Pt（NH3）2C2H＋（CE： 97.86 kJ/mol）, Pt（CHNH）2 CH＋（CE ： 176.31 kJ/mol） and Pt（CHNH）2 C2H＋（CE： 91.00 kJ/mol）. Moreover, ethylene insertion into the Pt-alkyl bond, which is the rate-determining step, is endothermic with barrier heights for LzPtCH3（CzH4）＋ decreasing in the order： PtCH＋（164.18 kJ/mol）〉（NH3）2 PtCH＋（129.95 kJ/mol）〉（CHNH）2 PtCH＋（115.27 kJ/mol）, which has the same tendency for the ethyl case. The insertion product will continually undergo t-hydride elimination, which is exothermic. On the other hand, the effects of solvent （dichloromethane, THF and benzene） are investigated with PCM method, but the inclusion of the effects in the computations only slightly affects the results. Beside that, a complete catalytic cycle for ethylene dimerization is studied in detail and the calculations agree well with known energetic and recognized tendencies.

关键词： platinum ethylene insertion reaction DFT (B3LYP)

Syntheses and Characterizations of Two Manganese(Ⅱ)Coordination Polymers Containing Three-dimensional Interpenetrating Networks Constructed by Mixed Ligands

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Chinese Journal of Structural Chemistry 2017年第1期36卷 118-126页

作者：郝少云郝增川刘永光董桂英 College of Chemical Engineering Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic MaterialsNorth China University of Science and Technology

Two new three-dimensional coordination polymers, namely [Mn（L）（bpdc）]n（1）, [Mn（L）0.5（ndc）]n（2）（L = 1,4-bis（2-methylbenzimidazole）butane, H2 bpdc = 4,4＇-biphenyldicarboxylic acid, H2 ndc = 2,6-naphthalenedicarboxylic acid） have been successfully synthesized under hydrothermal conditions. Two complexes were characterized by physico-chemical, spectroscopic methods and single-crystal X-ray diffraction. Complex 1 shows a 3D → 3D 5-fold interpenetrated network with a 4-connected uninodal dia topology. Complex 2 possesses a 3D → 3D 3-fold interpenetrating architecture with a binodal（4,5）-connected xah topology. The fluorescence and thermal properties of the title complexes were discussed.

关键词： bis(benzimidazole) catalytic property dicarboxylate fluorescence property manganese(Ⅱ)

Stereoselective Synthesis of Nontethered trans-4 Bis(aziridino)[60]fullerene Derivatives

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Chinese Journal of Chemistry 2023年第18期41卷 2282-2288页

作者： Jie Xiong Shuang Feng Rufang Peng Bo Jin State Key laboratory of environment-friendly Energy materials Southwest University of Science and TechnologyMianyangSichuan 621010China

Comprehensive Summary,The stereoselective preparation of fullerene bis-adducts through nontethered methods remains difficult due to the significant amount of regioisomers *** trans-4 aziridino[60]fullerenes,C_(60)(NC_(6)H_(4)R)n(n=1 or 2,R=OMe,OEt,OBu),were selectively synthesized even without a catalyst by reacting octabromofullerene with the corresponding *** magnetic resonance spectroscopy,UV-vis spectroscopy,and X-ray structural analysis provided convincing characterization of the compounds.A possible reaction process was proposed to clarify the synthesis of highly regioselective trans-4-bisaziridino[60]*** possible application of these aziridino[60]fullerene derivatives as propellant stabilizers was also explored.

关键词： Fullerene Regioselectivity Mechanism Nitrocellulose Stability

Tribological Behaviors of Electroless Nickel-Boron Coating on Titanium Alloy Surface

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 309-320页

作者： Yao Jia Jianping Lai Jiaxin Yu Huimin Qi Yafeng Zhang Hongtu He Key laboratory of Testing Technology for Manufacturing Process in Ministry of Education State Key Laboratory of Environment-Friendly Energy MaterialsSouthwest University of Science and TechnologyMianyang 621010China

Titanium alloys are excellent structural materials in engineering fields,but their poor tribological properties limit their further *** plating is an effective method to enhance the tribological performance of alloys,but it is difficult to efficiently apply to titanium alloys,due to titanium alloy’s strong chemical *** this work,the electroless Nickel-Boron(Ni-B)coating was successfully deposited on the surface of titanium alloy(Ti-6AL-4V)via a new pre-treatment ***,linearly reciprocating sliding wear tests were performed to evaluate the tribological behaviors of titanium alloy and its electroless Ni-B *** was found that the Ni-B coatings can decrease the wear rate of the titanium alloy from 19.89×10^(−3)mm^(3)to 0.41×10^(−3)mm^(3),which attributes to the much higher hardness of Ni-B *** heat treatment,the hardness of Ni-B coating further increases corresponding to coating crystallization and hard phase ***,heat treatment does not improve the tribological performance of Ni-B coating,due to the fact that higher brittleness and more severe oxidative wear exacerbate the damage of heat-treated ***,the Ni-B coatings heat-treated both in air and nitrogen almost present the same tribological *** finding of this work on electroless coating would further extend the practical applications of titanium alloys in the engineering fields.

关键词： Electroless coating Titanium alloy Tribology Wear Heat treatment Nanoindentation

A novel Cu_(1.5)Mn_(1.5)O_(4)photothermal catalyst with boosted surface lattice oxygen activation for efficiently photothermal mineralization of toluene

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Nano Research 2023年第2期16卷 2133-2141页

作者： Qiang Cheng Zhuangzhuang Wang Xiaotian Wang Jiaming Li Yuan Li Gaoke Zhang Shenzhen Research Institute Hubei Key Laboratory of Mineral Resources Processing and EnvironmentState Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China

Developing a novel photothermal catalyst for efficient mineralization of volatile organic compounds(VOCs)is of great significance to control air ***,for the first-time,a spinel Cu_(1.5)Mn_(1.5)O_(4)nanomaterial with enhanced surface lattice oxygen activation was successfully obtained by a novel light-driven in situ reconstruction strategy from its precursor(CuMnO_(2))for efficient toluene mineralization.X-ray diffraction(XRD)and high-resolution transmission electron microscopy(HRTEM)analyses confirm that the CuMnO_(2)phase was converted into spinel Cu1.5Mn1.5O4 phase under full spectrum light ***–visible–near infrared ray(UV–vis–NIR)spectroscopy,X-ray photoelectron spectroscopy(XPS)analysis,and density functional theory(DFT)calculations determine that the strong near-infrared absorption ability and low dissociation energy of oxygen bond in Cu_(1.5)Mn_(1.5)O_(4)are beneficial to its surface lattice oxygen ***,O2-temperature programmed desorption(TPD)and in situ diffuse reflectance infrared transform spectroscopy(DRIFTS)further indicate that the surface lattice oxygen of the Cu_(1.5)Mn_(1.5)O_(4)is easily activated under light irradiation,which can promote ring opening of *** research endows a new design of photothermal nanomaterial with enhanced lattice oxygen activation for deep oxidation of VOCs.

关键词： Cu_(1.5)Mn_(1.5)O_(4)nanomaterial surface lattice oxygen light-driven photothermal catalysis volatile organic compounds