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Journal of Materials Science & Technology 2024年第17期184卷 43-53页

作者： Peng Hu Xinyu Gong Hexiong Liu Wenyuan Zhou jinshu wang Key Laboratory of Advanced Functional Materials Education Ministry of ChinaFaculty of Materials and ManufactureBeijing University of TechnologyBeijing 100124China

In this work,accelerated sintering of Y_(2)O_(3)dispersion strengthened tungsten alloy with a well-regulated structure was achieved by a novel dissolution-precipitation *** indicated,yttrium oxide was firstly dissolved into the lattices of W powder precursor during the thermal plasma synthesis process in a one-step and ultra-fast way,and then homogeneously precipitated out within W grains during *** theoretical calculation reveals that the formation process of Y_(2)O_(3)dispersoids enhanced the driving force of densification by increasing the sintering stress and declining the macroscopic viscosity,resulting in improved diffusion ability for the W *** microstructural investigation further confirmed the occurrence of mass inter-diffusion at the W-Y_(2)O_(3)interface,which provides a fast diffusion pathway for W atoms,and is responsible for the accelerated densification *** sintered at 1600°C for 1 h,the as-obtained alloy possesses a high relative density of 98.26%,together with a refined grain size of 970 nm for W and 50 nm for intragranular Y_(2)O_(3),respectively.

关键词： Plasma synthesis Composite nanopowders W-Y_(2)O_(3)alloy Dissolution-precipitation Accelerated densification

Flower-, wire-, and sheet-like MnO_2-deposited diatomites:Highly efficient absorbents for the removal of Cr(Ⅵ)

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Journal of Environmental Sciences 2015年第3期27卷 71-81页

作者： Yucheng Du Liping wang jinshu wang Guangwei Zheng Junshu Wu Hongxing Dai Key Lab of Advanced Functional Materials Ministry of Education College of Materials Science and Engineering Beijing University of Technology Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical EngineeringCollege of Environmental and Energy Engineering Beijing University of Technology

Flower-, wire-, and sheet-like MnO2-deposited diatomites have been prepared using a hydrothermal method with Mn（Ac）2, KMnO4 and/or MnSO4 as Mn source and diatomite as support. Physical properties of the materials were characterized by means of numerous analytical techniques, and their behaviors in the adsorption of chromium（VI） were evaluated. It is shown that the IvinO2-deposited diatomite samples with different morphologies possessed high surface areas and abundant surface hydroxyl groups （especially the wire-like MnO2/diatomite sample）. The wire-like MnO2/diatomite sample showed the best performance in the removal of Cr（VI）, giving the maximum Cr（VI） adsorption capacity of 101 mg/g.

关键词： Morphological effect MnO2-deposited diatomite Cr(Vl) removalA dsorption efficiency

Progress on RE2O3-Mo/W matrix secondary emitter materials

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Science China(Technological Sciences) 2017年第10期60卷 1439-1446页

作者： wang jinshu DONG LiRan LIU Wei YANG Fan CHEN ShuQun School of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

Two types of secondary emitter materials, the rare earth oxides(RE_2O_3) doped Mo cermet cathodes and the Y_2O_3-W matrix pressed cathode, are introduced in this paper. According to the calculation results, Y_2O_3 exhibits the best secondary emission property among Y_2O_3,La_2O_3,CeO_2 and Lu_2O_3. The rare earth oxides co-doped Mo cathodes in which Y_2O_3 is the main active substance exhibit better secondary emission property than single RE_2O_3 doped Mo cathode. The results obtained by the Monte-Carlo calculation method show that the secondary electron emission property is strongly related to the grain size of the cathode. The decreasing of the grain size reduces the positive charge effect of the rare earth oxide due to the electrons supplement from the metal to the rare earth oxide, whereby the secondary electrons are easier to escape into the vacuum. Y_2O_3 is introduced into Ba-W cathode to fabricate a pressed Y_2O_3-W matrix dispenser cathode. The result indicates that the secondary emission yield of the Ba-W cathode increases from 2.13 to 3.51 by adding Y_2O_3, and the thermionic emission current density(J_0) could reach 4.18 A/cm^2 at 1050 ℃b.

关键词： rare earth oxide molybdenum tungsten cathode

Nb_2O_5 nanowires in-situ grown on carbon fiber: A high-efficiency material for the photocatalytic reduction of Cr(Ⅵ)

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Journal of Environmental Sciences 2018年第4期30卷 358-367页

作者： Yucheng Du Shihao Zhang jinshu wang Junshu Wu Hongxing Dai Key Lab of Advanced Functional Materials Ministry of Education College of Materials Science and Engineering Beijing University of Technology Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical Engineering College of Environmental and Energy EngineeringBeijing University of Technology

Niobium oxide nanowire-deposited carbon fiber（CF） samples were prepared using a hydrothermal method with amorphous Nb2O5·nH2O as precursor. The physical properties of the samples were characterized by means of numerous techniques, including X-ray diffraction（XRD）, energy-dispersive spectroscopy（EDS）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, selected-area electron diffraction（SAED）, UV–visible spectroscopy（UV–vis）, N2 adsorption–desorption, Fourier transform infrared spectroscopy（FT-IR）, and X-ray photoelectron spectroscopy. The efficiency for the removal of Cr（VI） was *** such as pH value and initial Cr（VI） concentration could influence the Cr（VI） removal efficiency or adsorption capacity of the Nb2O5/carbon fiber sample obtained after hydrothermal treatment at 160°C for 14 hr. The maximal Cr（VI） adsorption capacity of the Nb2O5 nanowire/CF sample was 115 mg/g. This Nb2O5/CF sample also showed excellent photocatalytic activity and stability for the reduction of Cr（Ⅵ） under UV-light irradiation： the Cr（VI） removal efficiency reached 99.9% after UV-light irradiation for 1 hr and there was no significant decrease in photocatalytic performance after the use of the sample for 10 repeated cycles. Such excellent Cr（VI） adsorption capacity and photocatalytic performance was related to its high surface area,abundant surface hydroxyl groups, and good UV-light absorption ability.

关键词： Carbon fiber Niobium oxide nanowire Photocatalytic reduction Cr(Ⅵ) removal Adsorption efficiency

Scandia doped tungsten matrix for impregnated cathode

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Rare Metals 2008年第1期27卷 9-12页

作者： wang jinshu wang Yanchun LIU Wei LI Hongyi ZHOU Meiling School of Materials Science and Engineering Beifing University of Technology Beijing 100022 China

As a matrix for Sc-type impregnated cathode,scandia doped tungsten with a uniform distribution of Sc2O3 was obtained by powder metallurgy combined with the liquid-solid doping *** microstructure and composition of the powder and the anti-ion bombardment behavior of scandium in the matrix were studied by means of SEM,EDS,XRD,and in-situ AES *** powder covered with scandium oxide,an ideal scandium oxide-doped tungsten powder for the preparation of Sc-type impregnated cathode,was obtained using the liquid-solid doping *** with the matrix prepared with the mechanically mixed powder of tungsten and scandium oxide,Sc2O3-W matrix prepared with this kind of powder had smaller grain size and uniform distribution of *** on the surface of Sc2O3 doped tungsten matrix had good high temperature stability and good anti-ion bombardment capability.

关键词： scandia tungsten impregnated cathode doping

Recent progress of efficient utilization of titanium-bearing blast furnace slag

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 22-31页

作者： Yongfeng Cai Ningning Song Yunfei Yang Lingmin Sun Peng Hu jinshu wang Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufactureBeijing University of TechnologyBeijing 100124China

Titanium-bearing blast furnace slag(BFS)has valuable compositions and potential environmental ***,developing efficient and green approaches to utilize BFS is highly desired for resource economization and environmental *** the past decades,many attempts have been adopted to reuse BFS efficiently,and significant advances in understanding the fundamental features and the development of efficient approaches have been *** review provides a comprehensive overview of the latest progress on the efficient utilization of BFS and discusses the mechanism and characteristics of various approaches,along with their application *** particular,the extraction and enrichment of titanium-bearing phases from BFS are highlighted because of the high availability of titanium *** systemic and comprehensive review may benefit the design of new and green utilization routes with high efficiency and low cost.

关键词： titanium-bearing blast furnace slag utilization approach enrichment process extracting titanium mechanism

THERMIONIC EMISSION OF CARBONIZED La-Mo CATHODE

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中国有色金属学会会刊：英文版 1999年第2期9卷 26-30页

作者： Nie, Zuoren Zhou, Meiling wang, jinshu Zhang, Jiuxing Zuo, Tieyong Beijing Polytechnic Univ Beijing China

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１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃａｔｈｏｄｅｉｓｔｈｅｃｏｒｅｐａｒｔｏｆｅｌｅｃｔｒｏｎｉｃｄｅｖｉｃｅｂｅｃａｕｓｅｉｔｓｅｒｖｅｓａｓｔｈｅｅｌｅｃｔｒｏｎｒｅｓｏｕｒｃｅａｎｄｉｔｓｑｕａｌｉｔｙｄｉｒｅｃｔｌｙｉｎｆｌｕｅｎｃｅｓｔｈｅｌ...

关键词： cathoderareearthmolybdenumthermionic emissionLa2O3

Modulating charge separation and transfer for high-performance photoelectrodes via built-in electric field

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1126-1146页

作者： Houyan Cheng Peng Liu Yuntao Cui Ru Ya Yuxiang Hu jinshu wang Key Laboratory of Advanced Functional Materials of Education Ministry of China Faculty of Engineering and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Cryogenic Science and Technology and Beijing Key Lab of Cryo-Biomedical Engineering Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Inner Mongolia Academy of Science and Technology Hohhot 010020China

Constructing a built-in electric field has emerged as a key strategy for enhancing charge separation and transfer,thereby improving photoelectrochemical ***,considerable efforts have been devoted to this *** review systematically summarizes the impact of built-in electric fields on enhancing charge separation and transfer mechanisms,focusing on the modulation of built-in electric fields in terms of depth and ***,mechanisms and tuning strategies for built-in electric fields are ***,the state-of-the-art works regarding built-in electric fields for modulating charge separation and transfer are summarized and categorized according to surface and interface ***,current strategies for constructing bulk built-in electric fields in photoelectrodes are explored,and insights into future developments for enhancing charge separation and transfer in high-performance photoelectrochemical applications are provided.

关键词： photoelectrochemical water splitting bulk built-in electric field cation intercalation charge separation and transfer

A nanoporous oxide interlayer makes a better Pt catalyst on a metallic substrate： Nanoflowers on a nanotube bed

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Nano Research 2014年第7期7卷 1007-1017页

作者： Hongyi Li jinshu wang Man Liu Hong wang Penglei Su JunshuWu Ju Li Key Laboratory of Advanced Materials College of Materials and Engineering Beijing University of Technology Beijing 100124 China Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

To improve the contact between platinum catalyst and titanium substrate, a layer of TiO2 nanotube arrays has been synthesized before depositing Pt nanoflowers by pulse electrodeposition. Dramatic improvements in electrocatalytic activity （3x） and stability （60x） for methanol oxidation were found, suggesting promising applications in direct methanol fuel cells. The 3x and 60x improvements persist for Pt/Pd catalysts used to overcome the CO poisoning problem.

关键词： electrocatalyst titanium dioxide nanotube platinum nanoflower catalytic activity cycle life

Unraveling structure evolution failure mechanism in MoS_(2)anode for improving lithium storage stability

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Journal of Materials Science & Technology 2022年第33期128卷 245-253页

作者： Guannan Zu Shiyu Xu Changhao wang Hongyi Li Manchen Zhang Xiaoxing Ke Yuxiang Hu Ruzhi wang jinshu wang Key Laboratory of Advanced Functional Materials of Education Ministry of China Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

2 H phase molybdenum disulfide(2 H-MoS_(2))possesses the two-dimensional layered structure and high theoretical capacity,presenting excellent lithiation-delithiation ***,the violent capacity decay within dozens of cycles still remains a great challenge due to lacking of in-depth failure ***,a novel decay-recovery-decay failure phenomenon upon long-term cycles is reported for the first time,which originates from the slow size change of Mo nanoparticles(NPs).Decay stages are triggered by many irregular-shaped Mo NPs with the increasing size up to~15 nm,leading to prominent pseudocapacitance failure and capacity *** recovery stages are attributed to the pulverization of coarse Mo NPs through surface sulfurization and accompanying *** overcome the instability issue,proper modifiers should be introduced to restrain the spontaneous growth of Mo NPs,such as aluminum oxide(Al_(2)O_(3)).The strong Mo-Al_(2)O_(3)bond gradually"drags"Al_(2)O_(3)fragments into the active material as the cycle continuously proceeds,resulting in the efficient refinement and the reversible conversion between Mo and MoS_(2).Therefore,the enhanced cycling stability and the capacity retention are successfully *** is expected to provide a new insight into the energy storage of transition metal chalcogenide anode materials in rechargeable batteries.

关键词： 2H-MoS_(2) Decay-recovery-decay Mo nanoparticles Al_(2)O_(3) Enhanced cycling stability