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Carbothermal reduction characteristics of oxidized Mn ore through conventional heating and microwave heating

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 221-230页

作者： Yang He Jian Liu Jian-hua Liu Chun-lin Chen Chang-lin zhuang Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China Commonwealth Scientific and Industrial Research Organisation Melbourne 3168Australia Dongbei Special Steel Group Co. Ltd.Dalian 116105China College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China

For the purpose of exploring a potential process to produce FeMn,the effects of microwave heating on the carbothermal reduction characteristics of oxidized Mn ore was *** microwave heating curve of the mixture of oxidized Mn ore and coke was analyzed in association with the characterization of dielectric *** comparative experiments were conducted on the carbothermal reductions through conventional and microwave heatings at temperatures ranging from 973 to 1373 *** thermogravimetric analysis showed that carbothermal reactions under microwave heating proceeded to a greater extent and at a faster pace compared with those under conventional *** metal phases were observed in the microstructures only under microwave *** carbothermal reduction process under microwave heating was *** electric and magnetic susceptibility differences were introduced into the thermodynamics analysis for the formation of metal *** developed thermodynamics considered that microwave heating could make the reduction of MnO to Mn more accessible and increase the reduction extent.

关键词： carbothermal reduction manganese ore manganese oxides microwave heating thermodynamics electromagnetic fields

Ni(OH)_2-Ni/C for hydrogen oxidation reaction in alkaline media

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Journal of Energy Chemistry 2019年第2期28卷 111-115页

作者： Yangxin Pan Gaohe Hu Juntao Lu Li Xiao lin zhuang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan University

The development of the hydrogen electrode is vital for the application of alkaline polymer electrolyte fuel cells(APEFCs).In this study,a series of Ni(OH)_2 decorated Ni/C catalysts(Ni(OH)_2-Ni/C) were prepared by a three-step electrochemical treatment of Ni/*** existence of Ni(OH)_2 was demonstrated by X-ray photoelectron spectroscopy(XPS),and the surface molar ratio of Ni(OH)_2/Ni of the samples was estimated via an electrochemical *** HOR catalytic activity of the catalysts was evaluated by a rotation disk electrode(RDE) method,and a "volcano plot" was established between the HOR exchange current(j0) and the surface molar ratio of Ni(OH)_2/*** top of the "volcano",the surface molar ratio of Ni(OH)_2/Ni is1.1:1,the j0 of which was 6.8 times of that of Ni/*** stability of the samples toward HOR was evaluated to be *** study added a systematic experimental evidence to the HOR research,showing that the HOR catalytic activity of Ni can be deliberately controlled via decoration of Ni(OH)_2,which may help understanding the HOR mechanism on Ni.

关键词： Hydrogen oxidation reaction Fuel cells Alkaline polymer electrolyte fuel cells Nickel Volcano plot

Curie and Pauli Spins in Lithium Intercalated MCMB

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Chinese Chemical Letters 2001年第2期12卷 163-164页

作者： Zhen Ming DU lin zhuang Jun Tao LU Department of Chemistry Wuhan UniversityWuhan 430072

The ESR signal of lithium intercalated MCMB can be well simulated by combination of a Lorentz curve and a Gauss curve. The ESR intensity of the Lorentz component is essentially independent of temperature while the Gauss component shows a linear change with the reciprocal of temperature, indicative of Pauli spin and Curie spin, respectively. The former is probably associated with the ordered (graphitized) structures while the latter with the disordered structures in the sample.

关键词： Lithium intercalation carbon ESR Curie spins Pauli spins

A combined electrochemical and DFT study of the lattice strain effect on the surface reactivity of Pd

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Chinese Chemical Letters 2007年第10期18卷 1301-1304页

作者： You Gui Chen lin zhuang Jun Tao Lu Department of Chemistry Wuhan University Wuhan 430072 China

We report a combined study of electrochemical experiments and ab initio calculations on tuning the surface reactivity of Pd via a compressive lattice strain achieved by employing nanoparticles of Pd-Cu alloys with a Pd-rich surface. Surface oxygen-containing species were used as the probing molecule for revealing the surface reactivity. Both density functional theory （DFT） calculations and experiments showed linear relationships, with very close slopes, between the adsorption strength of OHads and the Pd lattice constant. Not only is this work a successful realization of controllable modulation in the surface reactivity, but it also provides valuable information for the rational design of Pd-based catalysts for fuel cell applications.

关键词： Palladium Lattice strain Reactivity Density functional theory Electrocatalysis

Minority carrier lifetime evaluation of periphery edge region in high-performance multicrystalline ingot produced by seed-assisted directional solidification

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Frontiers of physics 2017年第5期12卷 91-97页

作者： Zhong Li Jia-Dan Li lin zhuang Rui-Jiang Hong College of Physics and Electronic Information Engineering Qinghai Nationalities University Xining 810007 China Guangdong Provincial Key Laboratory of Photovoltaic Technology School of Physics Sun Yat-sen University Guangzhou 510006 China

A high-performance multicrystalline silicon （mc-Si） ingot was produced by seed-assisted directional solidification, and the minority carrier lifetime of the periphery edge region was evaluated. The defects and impurities in the periphery edge region of the silicon wafers were systematically studied with photoluminescence （PL） imaging, minority carrier lifetime mapping, and Fourier transform infrared （FTIR） spectroscopy. Their relationships with the minority carrier lifetime were investigated. The concentration of substitutional carbon, interstitial oxygen, and dislocation clusters is not directly correlated with the low minority carrier lifetime of the edge zone of the mc-Si ingot. Inhomogeneous grain size distribution and contamination with iron impurities were demonstrated to be the main factors affecting the low minority carrier lifetime. By controlling the impurities and improving the grain size distribution, a modified furnace was designed and a higher-quality mc-Si ingot was manufactured.

关键词： minority carrier lifetime periphery edge seed-assisted directional solidification defects impurity

Alkaline polymer electrolyte fuel cells: Principle, challenges, and recent progress

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Science China Chemistry 2010年第2期53卷 357-364页

作者： TANG DaoPing PAN Jing LU ShanFu zhuang lin LU JunTao Hubei Key Lab of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China

Polymer electrolyte membrane fuel cells (PEMFC) have been recognized as a significant power source in future energy systems based on hydrogen. The current PEMFC technology features the employment of acidic polymer electrolytes which, albeit superior to electrolyte solutions, have intrinsically limited the catalysts to noble metals, fundamentally preventing PEMFC from widespread deployment. An effective solution to this problem is to develop fuel cells based on alkaline polymer electrolytes (APEFC), which not only enable the use of non-precious metal catalysts but also avoid the carbonate-precipitate issue which has been troubling the conventional alkaline fuel cells (AFC). This feature article introduces the principle of APEFC, the challenges, and our research progress, and focuses on strategies for developing key materials, including high-performance alkaline polyelectrolytes and stable non-precious metal catalysts. For alkaline polymer electrolytes, high ionic conductivity and satisfactory mechanical property are difficult to be balanced, therefore polymer cross-linking is an ultimate strategy. For non-precious metal catalysts, it is urgent to improve the catalytic activity and stability. New materials, such as transition-metal complexes, nitrogen-doped carbon nanotubes, and metal carbides, would become applicable in APEFC.

关键词： fuel cells polymer electrolyte anion exchange membrane catalyst non-precious metal

Discriminating High-Pressure Water Phases Using Rare-Event Determined Ionic Dynamical Properties

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Chinese Physics Letters 2020年第4期37卷 19-25页

作者： lin zhuang Qijun Ye Ding Pan Xin-Zheng Li Institute of Condensed A latter and Alat erial Physics School of PhysicsPeking UniversityBeijing 100871 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontier Science Center for Nano-optoelectronics and School of PhysicsPeking UniversityBeijing 100871 Department of Physics and Department of Chemistry Hong Kong University of Science and TechnologyHong Kong HKUST Fok Ying Tiling Research Institute Guangzhou 511458 Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871

Recent discoveries of dynamic ice Ⅶ and superionic ice highlight the importance of ionic diffusions in discriminating high-pressure(P) water *** rare event nature and the chemical bond breaking associated with these diffusions,however,make extensive simulations of these processes unpractical to ab initio and inappropriate for force field based *** a first-principles neural network potential,we performed a theoretical study of water at 5-70 GPa and 300-3000 ***-time dynamics of protons and oxygens were found indispensable in discriminating several subtle states of water,characterized by proton’s and oxygen ion’s diffusion coefficients and the distribution of proton’s *** dynamic ice Ⅶ,two types of proton transfer mechanisms,i.e.,translational and rotational transfers,were identified to discriminate this region further into dynamic ice Ⅶ T and dynamic ice Ⅶ *** triple point between ice Ⅶ,superlonic ice(SI),and liquid exists because the loosening of the bee oxygen skeleton is prevented by the decrease of interatomic distances at high P’*** melting of ice Ⅶ above ~40 GPa can be understood as a process of two individual steps:the melting of protons and the retarded melting of oxygens,responsible for the forming of *** boundary of the dynamic ice VIF and SI lies on the continuation line ice Ⅶ’s melting curve at low P’*** on these,a detailed phase diagram is given,which may shed light on studies of water under P’s in a wide range of interdisciplinary sciences.

关键词： Rare continuation steps

Self-adaptive behavior of nunchakus-like tracer induced by active Brownian particles

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Chinese Physics B 2022年第4期31卷 90-95页

作者： Yi-Qi Xia Guo-Qiang Feng zhuang-lin Shen Department of Physics and Electronic Engineering Yancheng Teachers UniversityYancheng 224007China Center for Soft Condensed Matter Physics&Interdisciplinary Research School of Physical Science and TechnologySoochow UniversitySuzhou 215006China Department of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

We design a nunchakus-like tracer and investigate its self-adaptive behavior in an active Brownian particle(ABP)bath via systematically tuning the self-propelled capability and density of ***,the nunchakus-like tracer will have a stable wedge-like shape in the ABP bath when the self-propelled force is high *** analyze the angle between the two arms of the tracer and the velocity of the joint point of the *** angle exhibits a non-monotonic phenomenon as a function of active ***,it increases with density of ABPs increasing monotonically.A simple linear relationship between the velocity and the self-propelled force is found under the highly active *** other words,the joint points of the tracer diffuse and the super-diffusive behavior can make the relation between the self-propelled force and the density of ABPs persist *** addition,we find that the tracer can flip at high density of *** results also suggest the new self-adaptive model research of the transport properties in a non-equilibrium medium.

关键词： tracer self-adaptive super-diffusion active Brownian particles

Regulation of the activity,selectivity,and durability of Cu-based electrocatalysts for CO_(2) reduction

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Science China Chemistry 2021年第10期64卷 1660-1678页

作者： Chang Liu Jun Gong Zeyu Gao Li Xiao Gongwei Wang Juntao Lu lin zhuang College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

CO_(2)electroreduction offers a promising approach to alleviate global warming and reduce petroleum consumption simultaneously,due to its capability to convert the greenhouse gas CO_(2)to valuable fuels and chemicals by using renewable *** has an essential impact on the CO_(2)electroreduction *** the diverse exploited materials,Cu is the only monometallic electrocatalyst that can produce CO and ***,its activity,selectivity,and durability are not satisfactory for practical ***,we make a comprehensive survey of the recent progress in enhancing Cu-based electrocatalysts with the strategies such as oxidation pre-treatment,heteroatom doping,morphological control,and surface *** review provides an overview of the current status and future opportunities for Cu-catalyzed CO_(2)*** may contribute to the rational design of Cu-based electrocatalysts with improved performance and thus advance practical CO_(2)electrolyzer development.

关键词： CO_(2)electroreduction Cu-based catalysts activity selectivity durability