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An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based Supercapacitors

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Nano-Micro Letters 2020年第5期12卷 78-94页

作者： Chenfeng Ding Tianyi Liu Xiaodong Yan Lingbo Huang Seungkon Ryu Jinle Lan yunhua yu Wei?hong Zhong Xiaoping Yang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122JiangsuPeople’s Republic of China Institute of Carbon Tech. Jeonju UniversityJeonju 55069South Korea School of Mechanical and Material Engineering Washington State UniversityPullman 99163USA

A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode ***,an ultramicroporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose(BC)precursor followed by nitrogen/sulfur dual doping is *** microporous carbon possesses highly concentrated micropores(~2 nm)and a considerable amount of sub-micropores(<1 nm).The unique porous structure provides high specific surface area(1554 m^2 g^-1)and packing density(1.18 g cm^-3).The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron *** a result,the remarkable specific capacitances,including ultrahigh gravimetric and volumetric capacitances(430 F g^-1 and 507 F cm^-3 at 0.5 A g^-1),and excellent cycling and rate stability even at a high current density of 10 A g^-1(327 F g^-1 and 385 F cm^-3)are *** compositing the porous carbon and BC skeleton,a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density(~0.77 mWh cm^-2),volumetric energy density(~17.8 W L^-1),and excellent cyclic stability.

关键词： Integrated capacitance Bacterial cellulose Microporous carbon Heteroatom doping Supercapacitors

Surface amorphization oxygen vacancy-rich porous Sn_(3)O_(x)nanosheets for boosted photoelectrocatalytic bacterial inactivation

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Rare Metals 2023年第5期42卷 1508-1515页

作者： Long-Wei Wang Lin Liu Zhen You Li-Wei Zhang Xiao-Di Zhang Na Ren hong Liu Xin yu Institute for Advanced Interdisciplinary Research(iAIR) School of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of Education School of MedicineNorthwest UniversityXi’an710069China Institute for Cell Engineering Department of NeurologyJohns Hopkins University School of MedicineBaltimoreMD21205USA State Key Laboratory of Crystal Material Shandong UniversityJinan250100China

Antibiotic misuse has resulted in the emergence of superbugs,warranting new antibacterial *** amorphisation oxygen vacancy-rich porous Sn_(3)O_(x)nanosheets in situ grown on Ni foam are successfully designed via a simple,one-step hydrothermal method,resulting in enhanced photoelectrochemical(PEC)bacterial *** this system,the porous structure enriches its surface with oxygen vacancies,which can extend the absorption spectrum into the near-infrared region,while oxygen vacancies can enhance the separation of electronhole *** importantly,the sheet-like porous structure enhances surface active sites and increase the contact area between bacteria and ***,the reactive oxygen species produced during the PEC process can directly act on the surface of bacteria and is100%effectively against drug-resistant Gram-positive and Gram-negative bacteria in water within 30 *** study acts as a foundation for the development of novel photoelectrocatalyst electrodes for efficient water purification.

关键词： Oxygen vacancy Photoelectrocatalysis Water purification Sn_(3)O_(x) Bacterial killing

Study on stabilities and electrochemical behavior of V(V) electrolyte with acid additives for vanadium redox flow battery

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Journal of Energy Chemistry 2014年第1期23卷 73-81页

作者： Gang Wang Jinwei Chen Xueqin Wang Jing Tian hong Kang Xuejing Zhu yu Zhang Xiaojiang Liu Ruilin Wang College of Materials Science and Engineering Sichuan University Institute of Electronics Engineering China Academy of Engineering Physics

Several acid compounds have been employed as additives of the V(V) electrolyte for vanadium redox flow battery(VRB) to improve its stability and electrochemical activity. Stability of the V(V) electrolyte with and without additives was investigated with ex-situ heating/cooling treatment at a wide temperature range of-5 ?C to 60 ?C. It was observed that methanesulfonic acid, boric acid, hydrochloric acid, trifluoroacetic acid,polyacrylic acid, oxalic acid, methacrylic acid and phosphotungstic acid could improve the stability of the V(V) electrolyte at a certain range of temperature. Their electrochemical behaviors in the V(V) electrolyte were further studied by cyclic voltammetry(CV), steady state polarization and electrochemical impedance spectroscopy(EIS). The results showed that the electrochemical activity, including the reversibility of electrode reaction, the diffusivity of V(V) species, the polarization resistance and the flexibility of charge transfer for the V(V) electrolyte with these additives were all improved compared with the pristine solution.

关键词： Cyclic voltammetry Electrochemical impedance spectroscopy Organic acids Secondary batteries Stability Vanadium compounds

Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate

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Journal of Iron and Steel Research International 2017年第7期24卷 691-696页

作者： yu-bao Liu Zhi-hong Zhang Er-xiong Zhao Xian-heng Zhang Xiao-qing Wang Guo-hua Chen Inner Mongolia Niobium Metallurgical Engineering Laboratory Baotou Research Institute of Rare Earths State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization

The pre-reduced Bayan Obo ferroniobium（FeNb）ore concentrate block was taken as raw materials for studying the physical properties of niobium-enriched slag and changes in niobium recovery *** addition,the dephosphorization rate of the slag under different melting-separation conditions was investigated using the melting-separation *** research results demonstrate that（i）the niobium recovery rate and dephosphorization rate of the slag decrease with the increase in melting-separation temperature;（ii）the niobium recovery rate of the slag initially increases and then decreases with increase in basicity and time;and（iii）the dephosphorization rate of the slag increases with the increase in basicity and *** the test was performed under the conditions of basicity of 0.6-0.7,time of 7-10min,and temperature of 1400-1450°C,the niobium recovery rate and dephosphorization rate are over 96%and 95%,*** scanning electron microscopy,it is observed that niobium mainly exists in the form of calcium and titanium silicate within the slag phase,with uneven distribution.

关键词： Melting separation Pre-reduced niobium ore concentrate Niobium-enriched slag Iron Dephosphorization rate Niobium recovery rate

An anthraquinone-based Cu(I) cyclic trinuclear complex for photo-catalyzing C–C coupling reactions

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Science China Chemistry 2023年第12期66卷 3525-3531页

作者： yu-Mei Wang Kai-Ming Mo Xiao Luo Ri-Qin Xia Jing-Yi Song Guo-hong Ning Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

Development of transition metal-based photocatalysts with low cost, strong visible light absorption, and high efficiency is a longstand pursuit for advanced organic synthesis, yet remains highly challenging. In this article, an anthraquinone-based copper(I)cyclic trinuclear complex(1) was designed and it featured strong visible light absorption, high charge separation efficiency and photochemical properties. Complex 1 as a heterogeneous photocatalyst can efficiently catalyze homo-coupling of terminal alkynes and denitrification-oxidative coupling reaction between hydrazinopyridine and terminal alkynes with excellent yield(up to 99%), broad substrate tolerance(27 examples) and superior reusability(up to 10 cycles without loss of performance) under mild conditions.

关键词： cyclic trinuclear complex photocatalysis C–C coupling reaction

Isolation and Identification of Virus dsRNA from Strawberry Plants

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Agricultural Sciences in China 2007年第1期6卷 86-93页

作者： LI He DAI hong-yan ZHANG Zhi-hong GAO Xiu-yan DU Guo-dong ZHANG Xin-yu College of Horticulture Shenyang Agricultural University Shenyang 110161 P.R.China

The analysis of virus genome is based on nucleic acid isolation. The aims of this study were to develop a method for isolation and identification of virus double-stranded ribonucleic acid （dsRNA） and to elucidate the nucleotide sequences of strawberry virus. Using the modified method, virus dsRNA was extracted from strawberry virus indicator plants and cultivated strawberry plants and detected using agarose gel electrophoresis with ethidium bromide staining and reverse transcription-polymerase chain reaction （RT-PCR）. The quantity of virus dsRNA varied among strawberry cultivars. The quantity of dsRNA from in vitro plantlets was higher than that from the young leaves of field plants. For the field-grown plants, there was more dsRNA in the young leaves. Virus dsRNA extracted from strawberry plants was resistant to deoxyribonuclease Ⅰ （DNase Ⅰ）, but evidently, it became resistant to ribonuclease A （RNase A） only in the presence of 0.5 M NaCl. Its bands in agarose gel could be readily recycled using an agarose gel DNA purification kit. With RT-PCR, the segments of both strawberry mottle virus and Strawberry mild yellow edge virus genomes were amplified by using the virus dsRNA recycled from gel or treated with DNase Ⅰ /RNase A as templates. The system developed for dsRNA isolation and identification in strawberry plants laid a sound foundation for the work on genome analysis of strawberry virus isolates in China.

关键词： dsRNA virus strawberry isolation RT-PCR

NUMERICAL STUDY OF FLOW AND DILUTION BEHAVIOR OF RADIAL WALL JET

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Journal of Hydrodynamics 2010年第5期22卷 681-688页

作者： LI Zhi-wei HUAI Wen-xin QIAN Zhong-dong ZENG yu-hong YANG Zhong-hua State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China

The radial wall jet is a flow configuration that combines the radial jet and the wall jet. This article presents a simulation of the radial wall jet by applying the transition Shear-Stress Transport （ SST） model. Tanaka’s experimental data are used for validation. The computed velocity profiles agree well with the experimental ones. The distributions of the velocity on cross-sections show a similarity in the main region and the profiles are different with those of the free radial jet or the wall jet, because the presence of the wall limits the expansion of the jet. By introducing the equivalent nozzle width, the maximum velocity decays and the half-width distributions are normalized, respectively. In addition to compare the flow field with experiments, this paper also analyzes the dilution effect of radial wall jets in terms of the concentration distributions. The concentrations on the wall keep constant within a certain distance from the nozzle. And the concentration distributions also show a similarity in the main region. Both the decays of the maximum concentration and the distributions of the concentration half-width fall into a single curve, respectively. The dilution effect of radial wall jets is thus verified.

关键词： radial wall jet velocity profile concentration distribution concentration half-width

Microwave absorption properties of Ag naowires/carbon black composites

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Chinese Physics B 2017年第2期26卷 349-356页

作者： Hai-Long Huang Hui Xia Zhi-Bo Guo yu Chen hong-Jian Li School of Physics and Electronics Central South University Changsha 410083 China

The composite that can absorb the high-performance electromagnetic（EM） wave is constructed into a sandwiched structure composed of carbon black（CB）/ethylene-vinyl acetate（EVA） and Ag naowires（Ag NWs）. The Ag NWs sandwiched between two CB/EVA layers are used to improve the absorption properties of composite. The effects of EVA-to-CB weight ratio, concentration and diameter of Ag NWs with a thickness of 0.4 mm on microwave absorption are *** results indicate that for an EVA-to-CB weight ratio of 1：3, Ag NW concentration of 1.0 mg/100 m L, and average diameter of 56 nm, the reflection loss（RL） of the composite is below-10 d B in a frequency range of 9.3 Ghz–18.0 GHz, with the minimum values of-40.0 d B and-25.6 d B at 13.5 GHz and 15.3 GHz, respectively. A finite element method（FEM）is used for calculating the RL of the composite. The calculated results are in agreement with the experimental data.

关键词： microwave absorption sliver nanowires finite element method polymer-based composites

A new method of preparing NdB_(6)ultra-fine powders

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Rare Metals 2022年第7期41卷 2363-2369页

作者： Zhi-He Dou Ting-An Zhang Shi-Gang Fan Qiu-Yang Huang Jin-Liang Zhang hong-yu Xiao Nan Fu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China

Combustion synthesis method was used to prepare NdB_(6)ultra-fine powders with B_(2)O_(3),Nd_(2)O_(3)and Mg powders as the raw *** basic thermody-namic data of NdB_(6) were *** standard forma-tion heat of NdB_(6) is-357.48 kJ·mol^(-1).The values of the heat capacity and the standard entropy are 96.87 and 86.60 J·K^(-1)·mol^(-1),*** adiabatic tempera-ture of the reaction is 2726 K,which is higher than the thermodynamic criterion of 1800 *** indicates that the combustion synthesis reaction of the B_(2)O_(3)-Nd_(2)O_(3)-Mg system could spontaneously take place by itself to generate NdB_(6).The NdB_(6) powders were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM)and differential scanning calorimetry-thermo-gravimetry(DSC-TG).The results indicate that the com-bustion products consist of NdB_(6),MgO,and a few Mg_(3)B_(2)O_(6)and Nd_(2)B_(2)O_(6).The leached products consist of single NdB_(6) phase,and its purity is 98.6 wt%.When the sample preparation pressure is 20 MPa,the average parti-cle size of NdB_(6) powders is less than 500 *** antioxidant ability of NdB_(6) is very strong,which is oxi-dized step by *** apparent activation energies of the oxidation reactions are 986.14 and 313.83 kJ·mol^(-1),*** addition,the reaction orders are 4.10 and 3.75,respectively.

关键词： Hexaboride neodymium Ultra-fine powder Combustion synthesis Thermodynamics estimate