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Engineering morphologies of cobalt oxide/phosphate-carbon nanohybrids for high-efficiency electrochemical water oxidation and reduction

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Journal of Energy Chemistry 2021年第1期30卷 139-146,I0005页

作者： Shan-Shan Xu Xian-Wei Lv Yan-Mei Zhao tie-zhen ren Zhong-Yong Yuan Hebei Provincial Key Laboratory of Green Chemical Technology&High Efficient Energy Saving School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin 300350China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021NingxiaChina

Active non-noble metal catalysts plays a decisive role for water electrolysis,however,the rational design and development of cost-efficient electrocatalysts with Pt/IrO2-like activity is still a challenging ***,a facile one-step electrodeposition route in deep eutectic solvents(DESs) is developed for morphology-controllable synthesis of cobalt oxide/phosphate-carbon nano hybrids on nickel foam(CoPO@C/NF).A series of CoPO@C/NF nanostructures including cubes,octahedrons,microspheres and nanoflowers are synthesized,which show promising electrocatalytic properties toward oxygen and hydrogen evolution reactions(OER/HER).Such surface self-organized microstructure with accessible active sites make a significant contribution to the enhanced electrochemical activity,and hybridizing cobalt oxide with cobalt pyrophosphates and carbon can result in enhanced OER performance through synergistic *** all nanostructures,the obtained microspherical CoPO@C/NF-3 catalyst exhibits excellent catalytic activities for OER and HER in 1.0 M KOH,affording an anodic current density of 10 mA cm^(-2) at overpotentials of 293 mV for OER and 93 mV for HER,with good long-time *** work offers a practical route for engineering the high-performance electrocatalysts towards efficient energy conversion and storage devices.

关键词： Cobalt-based electrocatalysts Oxygen evolution reaction Hydrogen evolution reaction Deep eutectic solvents Electrodeposition

Engineering heterostructured Ni@Ni(OH)_(2) core-shell nanomaterials for synergistically enhanced water electrolysis

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Green Energy & Environment 2022年第5期7卷 1024-1032页

作者： Jun-Wei Zhang Xian-Wei Lv tie-zhen ren zheng Wang Teresa J.Bandosz Zhong-Yong Yuan Hebei Provincial Key Laboratory of Green Chemical Technology&High Efficient Energy Saving School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin300130China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin300350China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan750021NingxiaChina Department of Chemistry and Biochemistry The City College of New YorkNY10031USA

Heterostructure engineering of electrocatalysts provides a fascinating platform to reasonably manipulate the physicochemical properties of nanomaterials and further improve their catalytic efficiency for water ***,it still remains a huge challenge to construct welldesigned core-shell heterostructured catalysts and identify the key role of components for synergistic ***,a melted polymeric salt tactics was innovatively developed to synthesize heterostructured Ni@Ni(OH)_(2) core-shell nanomaterials supported on porous carbon(named Ni@Ni(OH)_(2)/PC),wherein well-defined Ni(OH)_(2)-Ni heterostructure plays a pivotal role in improving electrocatalytic activity for water reduction and ***,the stable porous carbon support functions as a highway for continuous electron transfer between Ni and Ni(OH)_(2),and simultaneously enables the full exposure of accessible active *** fabricated Ni@Ni(OH)_(2)/PC exhibits outstanding bifunctional electrocatalytic performance for overall water splitting(η_(10)=1.55 V) with a good long-time *** work sheds new light on the design of engineering heterostructure of active bifunctional electrocatalysts for efficient energy conversion system.

关键词： stability synergistic splitting

Exosomes:the next-generation therapeutic platform for ischemic stroke

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Neural Regeneration Research 2025年第5期20卷 1221-1235页

作者： Wenjing Yin Hongyin Ma Yang Qu Jiaxin ren Yingying Sun zhen-Ni Guo Yi Yang Stroke Center Department of NeurologyFirst Hospital of Jilin UniversityChangchunJilin ProvinceChina Neuroscience Research Center Department of NeurologyFirst Hospital of Jilin UniversityChangchunJilin ProvinceChina

Current therapeutic strategies for ischemic stroke fall short of the desired objective of neurological functional ***,there is an urgent need to develop new methods for the treatment of this *** are natural cell-derived vesicles that mediate signal transduction between cells under physiological and pathological *** have low immunogenicity,good stability,high delivery efficiency,and the ability to cross the blood–brain *** physiological properties of exosomes have the potential to lead to new breakthroughs in the treatment of ischemic *** rapid development of nanotechnology has advanced the application of engineered exosomes,which can effectively improve targeting ability,enhance therapeutic efficacy,and minimize the dosages *** in technology have also driven clinical translational research on *** this review,we describe the therapeutic effects of exosomes and their positive roles in current treatment strategies for ischemic stroke,including their antiinflammation,anti-apoptosis,autophagy-regulation,angiogenesis,neurogenesis,and glial scar formation reduction ***,it is worth noting that,despite their significant therapeutic potential,there remains a dearth of standardized characterization methods and efficient isolation techniques capable of producing highly purified *** optimization strategies should prioritize the exploration of suitable isolation techniques and the establishment of unified workflows to effectively harness exosomes for diagnostic or therapeutic applications in ischemic ***,our review aims to summarize our understanding of exosome-based treatment prospects in ischemic stroke and foster innovative ideas for the development of exosome-based therapies.

关键词： blood–brain barrier electroacupuncture engineering exercise exosomes ischemic stroke mesenchymal stem cells microglia neuroprotection stents

Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang Xu Hao-Yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang Sheng-Jie Xu Ya-Qi Li Zhi-zhen ren Liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

A Review on Grain Refinement of Aluminum Alloys:Progresses,Challenges and Prospects

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 409-432页

作者： ren-Guo Guan Di tie School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

Aluminum becomes the most popular nonferrous metal and is widely used in many fields such as packaging,building transportation and electrical materials due to its rich resource, light weight, good mechanical properties, suitable corrosion resistance and excellent electrical conductivity. Grain refinement, which is obtained by changing the size of grain structure by different techniques, is a preferred method to improve simultaneously the strength and plasticity of metallic materials. Therefore, grain refining of aluminum is regarded as a key technique in aluminum processing *** to now, there have been a number of techniques for aluminum grain refining. All the techniques can be classified as four categories as follows： grain refining by vibration and stirring during solidification, rapid solidification, the addition of grain refiner and severe plastic deformation. Each of them has its own merits and demerits as well as applicable conditions, and there are still some arguments in the understanding of the mechanisms of these techniques. In this article, the research progresses and challenges encountered in the present techniques and the future research issues and directions are summarized.

关键词： Aluminum Grain refinement Vibration and stirring Rapid solidification Grain refiner Severe plastic deformation

THE OPTIMAL CONVERGENCE ORDER OF THE DISCONTINUOUS FINITE ELEMENT METHODS FOR FIRST ORDER HYPERBOLIC SYSTEMS

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Journal of Computational Mathematics 2008年第5期26卷 689-701页

作者： tie Zhang Datao Shi zhen Li Department of Mathematics and School of Information Science and Engineering Northeastern University Shenyang 110004 China

In this paper, a discontinuous finite element method for the positive and symmetric, first-order hyperbolic systems （steady and nonsteady state） is constructed and analyzed by using linear triangle elements, and the O（h^2）-order optimal error estimates are derived under the assumption of strongly regular triangulation and the Ha-regularity for the exact solutions. The convergence analysis is based on some superclose estimates of the interpolation approximation. Finally, we discuss the Maxwell equations in a two-dimensional domain, and numerical experiments are given to validate the theoretical results.

关键词： First order hyperbolic systems Discontinuous finite element method Convergence order estimate.

Improved thermoelectric properties of zone-melted p-type bismuth-telluride-based alloys for power generation

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Rare Metals 2022年第5期41卷 1490-1495页

作者： ren-Shuang Zhai tie-Jun Zhu State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang University.Hangzhou 310027China Thermoelectricity Technology Center Hangzhou Dahe Thermo-Magnetics Co.LtdHangzhou 310053China

Zone-melted bismuth-telluride-based alloys(ZM-BT) are extensively applied to manufacture commercial thermoelectric power generators(TEG). Optimizing the average figure of merit(zT) during 300–500 K of ZM-BT is favora... 详细信息

关键词： alloys bismuth power

Real Interpolation between Martingale Hardy and BMO Spaces

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Acta Mathematica Sinica,English Series 2013年第1期29卷 65-74页

作者： Yan Bo ren tie Xin GUO School of Mathematics and Statistics He'nan University of Science and Technology School of Mathematics and Systems Science Beihang University

In this paper, we consider the real interpolation with a function parameter between martingale Hardy and BMO spaces. An interpolation theorem for martingale Hardy and BMO spaces is formulated. As an application, real interpolation between martingale Lorentz and BMO spaces is given. Keywords Martingale space, BMO space, Lorentz space, real interpolation, function parameter

关键词： Martingale space BMO space Lorentz space real interpolation function parameter

Mid-infrared optical modulator enabled by photothermal effect

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Light(Science & Applications) 2023年第1期12卷 5-7页

作者： zhen Wang Wei ren Department of Mechanical and Automation Engineering The Chinese University of Hong KongNew TerritoriesHong Kong SARChina

Photothermal effect in a gas-filled hollow-core fiber may result in agile mid-infrared optical modulators for broadband phase modulation and high extinction ratio intensity modulation.

关键词： modulator optical fiber