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Controllable fabrication of nitrogen-doped porous nanocarbons for high-performance supercapacitors via supramolecular modulation strategy

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Journal of Energy Chemistry 2020年第10期29卷 348-357页

作者： Huaxia Chen Xingyu Lu Haihua Wang Dianpeng Sui Fanbao Meng Wei Qi Department of Chemistry College of ScienceNortheastern UniversityShenyang 110819LiaoningChina Shenyang Natural Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110116LiaoningChina

In the present work,we developed a micellar system of milk protein-surfactant(SDS)-graphene to prepare the graphene-based aerogels via hydrothermal and freeze-drying method,in which the novel surface-property of aerogels can be tuned with the decreasing of micellar size in the colloid systems resulting the improved specific surface *** milk protein also severed as green and sustainable sources to introduce nitrogen heteroatoms into the ***,the aerogels were further graphitized and activated to fabricate N-doped porous nanocarbon at 600℃.The initial surface composition and structure of the aerogel,which was proved,has obvious impact on the final structure of the synthesized nanocarbon materials,and thus influence their electrochemical *** optimized nanocarbon materials(MGPC-5),with enhanced specific surface area,degree of graphitization,and nitrogen doping,exhibited excellent capacitance performance and stability in both three-electrode system(518.8 F/g at a current density of 0.1 A/g)and symmetrical electrode system(120.8 F/g at current density of 0.1 A/g and with^95%capacitance retention after 5000 cycles of charging and discharging at 3 A/g)in *** assembled supercapacitor also shows ideal capacitive properties in series and parallel *** with a stable 1.6 V windows in Li2SO4 electrolyte,the symmetric supercapacitor cell exhibits a high energy density up to 36.7 W h/*** present work provides a feasible fabrication method for high-performance supercapacitor based on graphene and biomass derived carbon,the proposed surfaceproperty regulation and supercapacitor performance improvement strategy may also shed light on other energy related materials or system.

关键词： Graphene-based aerogel Milk protein Surfactant Controllable surface-property Supercapacitor

Fluorescence Spectra of Model Compounds for Light-emitting Alternating Copolymers in Heterogeneous Environments

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Chinese Chemical Letters 2001年第4期12卷 369-372页

作者： Jun Lin YANG Hong Zhen LIN Min ZHENG Feng Lian BAI Organic Solids Laboratory Center for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100080

In this paper, the fluorescence spectra of model compounds of light-emitting alternating copolymers. M (TPA-PPV) and M (TPA-PAV) (Scheme 1) were studied and the effect of KNO3 on the interaction between model compounds and ionic micelle-watts interface was also investigated. It is found that (I) The fluorescence changes of M (TPA-PPV) are related to the state of CTAB and SDS solution. (II)Aggregated state can be formed in M (TPA-PAV) solution at low concentration of CTAB. (III) Higher concentration of KNO3 may affect the interaction between model compounds and ionic micelle-water interface.

关键词： alternating copolymer charge transfer ionic micelle-water interface salt effect cetyl-trimethylammonium bromide sodium dodecylsulfate

Chloride‐Induced Highly Active Au Catalyst for Methyl Esterification of Alcohols

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Chinese Journal of Chemistry 2019年第3期37卷 249-254页

作者： Chengming Zhang Yongzhao Wang Engineering Research Center of Ministry of Education for Fine Chemicals School of Chemistry and Chemical EngineeringShanxi UniversityTaiyuanShanxi 030006China

Summary of main observation and conclusion Chloride is generally regarded as a harmful species for the heterogeneous catalysts, especially Au catalysts. In this work, a series of active Au/NiOx catalysts were successfully prepared with co‐precipitation method by tracking the concentrations of chloride in the re‐dispersed aqueous solutions. For methyl esterification of alcohols, the highest active Au/NiOx catalysts could be prepared from aqueous solutions containing 8‐13 ppm chloride, the yield of methyl benzoate of catalyst Au/NiOx‐9 was 99%. The catalyst structures and the role of chloride in catalysts were explored by ICP, BET, XPS, TEM and EXAFS characterizations. It was found that the appropriate amount of residual chloride in Au catalysts was beneficial to their catalytic activities. Especially for Au/NiOx‐9, the appropriate amount of residual chloride had positive effects on the physicochemical properties of Au/NiOx catalyst, the position of Au nanoparticles (NPs) located on NiOx crystallites and the ratio of Au^δ+/Au^0 in catalyst, which together resulted in its high reactivity.

关键词： Catalyst Au catalyst together effects EXAFS was NiOx

Modeling and Simulation of the Microstructure Evolution of the Gas-atomized Alloy Droplets during Spray Forming

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Journal of Materials Science & Technology 2003年第5期19卷 398-402页

作者： Jiuzhou ZHAO, Dongming LIU and Hengqiang YEInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Inst. of Metal Res. Chinese Acad. of Sci Shenyang 110016 China

In order to understand the solidification process of an atomized droplet and predict the fraction solidification of droplets with flight distance during spray forming, a numerical model based on the population dynamics approach is developed to describe the microstructure evolution under the common action of the nucleation and growth of grains. The model is coupled with droplets heat transfer controlling equations and solved for AI-4.5 wt pct Cu alloy. It is demonstrated that the numerical results describe the solidification process well.

关键词： Rapid solidification Microstructure evolution Modeling Spray forming

Detection of CD4^+ T-lymphocytes from hemodialyzed patients by surface plasmon resonance

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Chinese Chemical Letters 2012年第12期23卷 1393-1395页

作者： Hai Yan Wang Jian Jun Li Xiao Na Cao Ji Ying Xu Mei Rong Liu Yi Chen School of Chemistry and Chemical Engineering Shanxi Datong University East Section of Dongzhimen Hospital Affiliated Community Health Service of Beijing Sport University Key Laboratory of Analytical Chemistry for Living Biosystems ICCAS

A surface plasmon resonance （SPR） method was presented to discriminate hemodialyzed T-lymphocytes from the normal based on antibody--cell recognition. By dynamic reaction with fixed anti-human CD4 antibody, SPR could offer significant signals to distinguish hemodialyzed patients from the healthy controls within 200 s after the cell injection in respect of either rising speed or maximum binding capacity （p 〈 0.01）. The ratio method is also used to exclude the non-specific adsorption. The percentage of hemodialyzed patients＇ CD4＋ T ceils against the healthy control is 69 ± 18%. The most attractive of the present method is its ability to detect the intact and label-free lymphocytes, and further to detect the subpopulations, or proteins secreted by the desired lymphocytes subset.

关键词： Hemodialyzed patients CD4+ T-lymphocytes Antibody-antigen interactions SPR

Design and field measurement of a dipole magnet for a newly developed superconducting proton cyclotron beamline

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Nuclear Science and Techniques 2018年第9期29卷 214-221页

作者： Jun-Sheng Zhang Jin-Xing Zheng Yun-Tao Song Wu-Quan Zhang Ming Li Xian-Hu Zeng Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230031China

The design, field quality optimization, multipole field analysis, and field measurement of a dipole for a newly developed superconducting proton cyclotron(SC200) beamline are presented in this paper. The maximum magnetic field of the dipole is 1.35 T; the bending radius is 1.6 m with a proton beam energy in the range of70–200 Me V. The magnetic field was calculated with 2 D and 3 D simulations, and measured with a Hall mapping system. The pole shim and end chamfer were optimized to improve the field quality. Based on the simulated results,the multipole field components in the good-field region were studied to evaluate the field quality. The results showed that the field quality is better than ± 5 × 10^(-4) at1.35 T with shimming and chamfering. For the transverse field homogeneity, the third-order(B3) and fifth-order(B5)components should be controlled with symmetrical *** second-order(B2) component was the main disturbance for the integral field homogeneity; it could be improved with an end chamfer. The magnet manufacturing and field measurement were performed in this project. The measurement results demonstrated that the magnetic design and field quality optimization of the 45° dipole magnet can achieve the desired high field quality and satisfy the physical requirements.

关键词： Magnet Field quality Pole shim End chamfer Multipole field component

Cu-Promoted Cobalt Oxide Film Catalyst for Efficient Gas Emissions Abatement

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Journal of Thermal Science 2019年第2期28卷 225-231页

作者： EL KASMI Achraf WAQAS Muhammad MOUNTAPMBEME KOUTOU Patrick TIAN Zhenyu Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences National Advanced School Engineering of Maroua University of Maroua

Thin film catalysts have been recently reported as promising catalysts owing to their good catalytic activity and reduced material amount, leading to low-cost efficient catalysts for gaseous emissions control. Here, we report the slight loading of Cu in cobalt spinel using a one-step pulsed-spray evaporation chemical vapor deposition(PSE-CVD) synthesis technique for efficient short-chain volatile organic compounds(VOCs) emissions treatment. Crystalline structure and morphology analyses revealed nano-crystallite sizes and open-like morphology. The catalytic performance was evaluated through the complete oxidation of C_3H_6, as a short-chain representative model of VOCs, at a high gas hourly space velocity(GHSV). Very good activity was obtained towards the complete abatement of C_3H_6 at low temperature and no carbon monoxide(CO) was formed during the oxidation process. Slightly-promoted Co_3O_4 catalyst with Cu introduction resulted in high catalytic activity comparing to the performance of the catalysts in the literature, due to the high dispersion of Cu and high active surface oxygen amount. Moreover, to evaluate the capability of the used catalysts under near realistic reaction conditions, CO_2 effect on the catalytic activity was performed and the catalyst exhibited very good results. Thus, the adopted slightly-doping strategy to tailor a high active catalyst at low temperature could establish a very promising route to strongly enhance the activity of such other catalysts towards gas emissions abatement at low temperature.

关键词： low Cu-doping PSE-CVD technique thin film catalysts complete catalytic oxidation VOCs

A highly stable membrane with hierarchical structure for wide pH range flow batteries

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Journal of Energy Chemistry 2021年第5期30卷 80-86页

作者： Jing Hu Donglei Yu Tianyu Li Huamin Zhang Zhizhang Yuan Xianfeng Li Division of Energy Storage Dalian National Laboratory for Clean Energy(DNL)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

A membrane with high stability and ion conductivity in wide pH range is essential for energy storage ***,we report a novel membrane with hierarchical core-shell structure,which demonstrates high stability and ion conductivity,simultaneously under a wide pH range *** characterizations and theoretical calculation indicate that the non-solvent induces the chain segment configuration and eventually leads to polymer-polymer phase separation,thus forming hierarchical porous core-shell *** from this structure,an acidic vanadium flow battery(VFB)with such a membrane shows excellent performance over 400 cycles with an energy efficiency(EE)of above 81%at current density of 120 mA cm^(-2) and an alkaline zinc-iron flow battery(AZIFB)delivers a cycling stability for more than 200 cycles at 160 mA cm^(-2),along with an EE of above 82%.This paper provides a cost-effective and simple way to fabricate membranes with high performance for variety of energyrelated devices.

关键词： Energy storage Wide pH range flow batteries Hierarchical porous membrane Core-shell structure High stability

Robust 3D network architectures of MnO nanoparticles bridged by ultrathin graphitic carbon for high-performance lithium-ion battery anodes

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Nano Research 2018年第2期11卷 1135-1145页

作者： Jingchun Jia Xiang Hu Zhenhai Wen Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou China Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou China

A strategy was developed to fabricate a set of MnO@C nanohybrids with MnO nanopartides （NPs） embedded in an ultrathin three-dimensional （3D） carbon framework for use as anode materials for lithium-ion batteries （LIBs）. The 3D carbon frameworks provide MnO NPs with electrical pathways and mechanical robustness, which efficiently improved the reaction kinetics, prevented the MnO from fracturing and agglomerating, and limited the formation of a solid electrolyte interface （SEI） at the MnO-electrolyte interface. Benefitting from the unique 3D framework structure, the MnO/C nanohybrids carbonized at 500 ℃ exhibited a highly reversible specific capacity of 1,420 mAh.g-1 at 0.2 A.g-1, excellent cycling stability with 98% capacity retention, and enhanced rate performance of 680 mAh-g-1 at 2 A.g-L The feasibility of the large-scale production of such MnO/C nanohybrids, associated with their outstanding Li-ion storage properties, opens a promising avenue for the development of high-performance anodes for next- generation LIBs.

关键词： network architectures ultrathin carbon MnO Li-ion batter anode