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Balancing intrinsic properties of cathode materials allows high performance for protonic ceramic fuel cells

SusMat 2024年第6期4卷 1-13页

作者： Yanru Yin Bo Liu Dong Yan Jian Li Lichao Jia School of Materials Science and Engineering State Key Laboratory of Materials Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhanChina

The cathode performance significantly impacts the overall performance of protonic ceramic fuel cells(PCFCs).Many properties of the material,such as oxygen vacancies,protonation,charge carrier transport abilities,and surface oxygen reduction reaction activity,can affect cathode ***,which parameter has more weight is still being *** this work,we use Ba_(0.5)Sr_(0.5)Zr_(0.25)Fe_(0.65)X_(0.1)O_(3)as a case study(X=Zn,Cu,Mn,Ni,and Co).Firstprinciple calculations and experimental research are used to study and compare the critical parameters that determine cathode *** is discovered that no dopant can improve all the properties of the *** distinct intrinsic properties is a viable and rational *** balanced,the better *** compared to other dopants,nickel dopant is shown to be the most effective in the Ba_(0.5)Sr_(0.5)Zr_(0.25)Fe_(0.65)X_(0.1)O_(3)material system,allowing a high fuel cell performances of 1862,1450,and 1085 mW cm^(−2)at 700℃,650℃,and 600℃,with a low polarization resistance of 0.041Ωcm^(2)at 700℃,which is higher than the majority of cobalt-free cathodes for *** current study not only presents a promising cathode candidate,but more importantly,also an effective and fundamental methodology to design cathodes for PCFCs.

关键词： cathode high performance protonic ceramic fuel cells solid oxide fuel cell

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Microstructure and impact behavior of Mg-4Al-5RE-xGd cast magnesium alloys

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Journal of Magnesium and Alloys 2024年第5期12卷 1799-1814页

作者： Jie Wei Qudong Wang Huisheng Cai Mahmoud Ebrahimi Chuan Lei National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

This work investigated the microstructure and impact behavior of Mg-4Al-5RE-xGd(RE represents La-Ce mischmetal;x=0,0.2,0.7 wt.%)alloys cast by high-pressure die casting(HPDC),permanent mold casting(PMC),and sand casting(SC)*** results indicated that with increasing Gd content,the grain sizes of the HPDC alloy had a slight change,but the grains of the PMC and SC alloys were significantly ***,the acicular Al_(11)RE_(3)phase was modified into the short-rod shape under the three casting *** impact toughness of the studied alloy was mainly dominated by the absorbed energy during the crack *** increasing Gd content,the impact toughness of the studied alloy monotonically increased due to the lower tendency of the modified second phase toward crack *** impact stress was higher than the tensile stress,exhibiting a strain rate sensitivity for the mechanical response;however,the HPDC alloy had an inconsistent strain rate sensitivity during the impact event due to the transformation of the deformation mechanism from twinning to slip with increasing *** dimples covered the fracture surface of the fine-grained HPDC alloys,indicating a typical ductile ***,due to the deficient{1012}twinning activity and the suppressed grain boundary sliding during the impact event,the HPDC alloys showed insufficient plastic deformation capacity.

关键词： Mg-Al-RE alloy Gadolinium Microstructure Impact behavior

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One-step floating conversion of biomass into highly graphitized and continuous carbon nanotube yarns

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Green Energy & Environment 2023年第6期8卷 1711-1718页

作者： Gongxun Zhai Qianqian Wang Fuyao Liu Zexu Hu Chao Jia Dengxin Li Hengxue Xiang Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

The rapid growth of the demand for carbon nanotubes(CNTs) has greatly promoted their large-scale synthesis and development. However,the continuous production of CNT fibers by floating catalyst chemical vapor deposition(FCCVD) requires a large amount of non-renewable carbon sources. Here, the continuous production of highly graphitized CNT yarns from biomass tannic acid(TA) is reported. The chelation of TA and catalyst promotes the rapid cracking of biomass into carbon source gas, and the pyrolysis cracking produces the reducing gas, which solves the problems of the continuous production of CNT yarns using biomass. Through simple twisting, the mechanical strength of CNT yarn can reach 886 ± 46 MPa, and the electrical conductivity and graphitization(IG/ID) can reach 2 × 10^(5)S m^(-1)and 6.3, respectively. This work presents a promising solution for the continuous preparation of CNT yarns based on green raw material.

关键词： Carbon nanotube Tannic acid Biomass Pyrolysis Floating catalyst chemical vapor deposition

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Polymer-based hybrid materials and their application in personal health

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Nano Research 2023年第3期16卷 3956-3975页

作者： Ran Cao Yanhua Cheng Ruili Wang Jin Wen Liping Zhu Weiqing Kong Xiaolan Qiao Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

With unprecedented properties and functions,polymer-based hybrid materials hold extremely important position in many *** in this review,we summarized applications of polymer-based hybrid materials toward personal ***,theoretical calculation and in-situ visualization used to explore the interfacial interaction and formation of hybrid materials are ***,applications of polymer-based hybrid materials in personal health from proactive protection(anti-bacteria and harmful gas removal),health condition monitoring(breathing and sleep)to disease diagnosis(magnetic resonance imaging),and tissue therapy(dental restoration)are ***,aggregation-induced emission(AIE)organic molecules based optical sensors for personal security and polymer semiconductor for organic thin film transistors are simply ***,we present the future tendency for preparing polymer-based hybrid materials that related with personal health.

关键词： hybrid materials protection monitoring biomedical function

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Fabrication of amorphous nanoporous ZrO_(2)/SiO_(2) aerogel enabling nonlinear optical properties

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Journal of Materiomics 2024年第5期10卷 1109-1116页

作者： Hongwei Chu Mingjie Xu Benxue Liu Zhongben Pan Han Pan Shengzhi Zhao Dong Xu Dechun Li School of Information Science and Engineering and Key Laboratory of Laser and Infrared System of Ministry of EducationShandong UniversityQingdao266237ShandongChina State Key Laboratory of Crystal Materials Shandong UniversityJinan250100China

Amorphous oxides have unique physicochemical properties with extensive opto-electronic applications such as the thin-film transistor,light-emitting diode backplanes,and supercontinuum *** this contribution,we synthesize the amorphous ZrO_(2)/SiO_(2) nanoporous aerogel with high structural *** the femtosecond excitation laser at 800–1,064 nm,the broadband second harmonic generation is *** nonlinear optical properties of the as-prepared ZrO_(2)/SiO_(2) aerogel are investigated at 1.0μm and 1.5μm for the first ***,the amorphous ZrO_(2)/SiO_(2) saturable absorber is originally applied in the Yb-doped and Er-doped fiber lasers to realize the mode-locking *** the Yb-doped fiber laser,the dissipative soliton resonance mode-locking operation is demonstrated with the largest pulse duration of 22 ns at a repetition rate of 7.8 MHz and a high signal-to-noise ratio of 64 *** the Er-doped fiber laser,a conventional soliton mod-locking regime is observed with an ultrashort pulse width of 960 fs,a repetition frequency of 6.55 MHz,and a time-bandwidth production of *** work shows the good ability of the ZrO_(2)/SiO_(2) aerogel in generating ultrafast pulses and extends the saturable absorber into the amorphous material realm.

关键词： ZrO_(2)/SiO_(2)aerogel Nonlinear optical properties Second harmonic generation Dissipative soliton resonance Soliton mode-locking

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High-temperature optoelectronic synaptic devices based on 4H-SiC

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science China(Information sciences) 2025年第4期68卷 151-159页

作者： Mingxuan BU Yue WANG Zhenyi NI Dongke LI Deren YANG Xiaodong PI State Key Laboratory of Silicon and Advanced Semiconductor Materials & School of Materials Science and Engineering Zhejiang University Institute of Advanced Semiconductors & Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University

Optoelectronic synaptic devices operating at high temperatures have application potential across many important fields, including the aerospace and defense industries. However, limited research exists on such devices. Herein, we fabricate4H-SiC-based high-temperature optoelectronic synaptic devices that are capable of achieving diverse synaptic functionalities at temperatures as high as 600 K. The synaptic functionalities are realized for these devices through carrier capture and release of the deep-level defects introduced via electronic irradiation. A 3 × 3 array of high-temperature optoelectronic synaptic devices enables the image memory functions. A neural network model constructed using this array addresses the issue of color quantization. The optoelectronic synaptic devices thus developed are capable of high-temperature applications.

关键词： optoelectronic synaptic devices 4H-SiC synaptic plasticity neuromorphic computing high-temperature devices

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Enzymatically prepared alginate oligosaccharides improve broiler chicken growth performance by modulating the gut microbiota and growth hormone signals

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Journal of Animal science and Biotechnology 2023年第5期14卷 2107-2127页

作者： A La Teng Zhu La Yuqing Feng Die Hu Yimei Feng Xiaolu Jin Dan Liu Yuming Guo Gong Cheng Yongfei Hu State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Background Alginate oligosaccharide(AOS)holds great potential as a novel feed supplement in farm ***,the effects of AOS on chicken health and the underlying mechanisms are not fully *** study aimed to optimize the enzymatic preparation of AOS by using bacterial alginate lyases expressed in yeast,investigate the effects of the prepared AOS on the growth performance and gut health of broiler chickens,and reveal the underlying *** Five alginate lyases from bacteria were cloned into Pichia pastoris GS115 and the alginate lyase PDE9 was expressed at relatively high yield,activity and stability in *** trials were carried out using 3201-day-old male Arbor Acres broilers(four groups;8 replicates/group×10 chicks/replicate)receiving either a basal diet or the same diet supplemented with 100,200 and 400 mg/kg PDE9-prepared AOS for 42 *** results showed that dietary supplementation of 200 mg/kg AOS displayed the highest activity in promoting the birds’ADG and ADFI(P<0.05).AOS ameliorated the intestinal morphology,absorption function and barrier function,as indicated by the enhanced(P<0.05)intestinal villus height,maltase activity,and the expression of PEPT,SGLT1,ZNT1,and *** also increased serum insulin-like growth factor-1,ghrelin(P<0.05),and growth hormone(P<0.1).Moreover,the concentrations of acetate,isobutyrate,isovalerate,valerate,and total SCFAs in cecum of birds fed AOS were significantly higher than the control birds(P<0.05).Metagenomic analysis indicated that AOS modulated the chicken gut microbiota structure,function,and microbial interactions and promoted the growth of SCFAs-producing bacteria,for example,Dorea sp.002160985;SCFAs,especially acetate,were found positively correlated with the chicken growth performance and growth-related hormone signals(P<0.05).We further verified that AOS can be utilized by Dorea *** grow and to produce acetate in *** We demonstrated that the enzymatically

关键词： Acetate Alginate lyases Alginate oligosaccharides Dorea sp. Gut microbiota

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Continuously adjustable mechanical metamaterial based on planetary gear trains and external meshing gears

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Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 233-252页

作者： Shuai MO Xu TANG Keren CHEN H.HOUJOH Wei ZHANG State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Mechanical EngineeringGuangxi UniversityNanning 530004China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Precision and Intelligence Laboratory Tokyo Institute of TechnologyYokohama 226-8503Japan

The metamaterial based on external meshing gears(MEG)is designed based on the principle of external meshing gear *** on the meshing transmission principle of external meshing gears and planetary gear trains,the internal and external gear rings are *** on the internal and external gear rings,the metamaterial based on inner and outer planetary gear trains(MIP)is designed to study the shear modulus,Young's modulus,and amplitude-frequency characteristics of the metamaterial based on gears at different *** effects of the number of planetary gears on the physical characteristics of the MIP are *** results show that the MEG can be continuously adjusted by adjusting the shear modulus and Young's modulus due to its meshing *** the same number of gears,the adjustment range of the MIP is larger than the adjustment range of the *** the number of planetary gears increases,the adjustment range of the MIP ***,when the metamaterial based on gears rotates,the harmonic response changes with the change of the angle.

关键词： metamaterial adjustable external inner and outer planetary gear train

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Advances in depressants for flotation separation of Cu–Fe sulfide minerals at low alkalinity:A critical review

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 1-17页

作者： Qicheng Feng Wenhang Yang Maohan Chang Shuming Wen Dianwen Liu Guang Han State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming 650093China

The flotation separation of Cu–Fe sulfide minerals at low alkalinity can be achieved using selective *** the flotation system of Cu–Fe sulfide minerals,depressants usually preferentially interact with the pyrite surface to render the mineral surface hydrophilic and hinder the adsorption of the *** review summarizes the advances in depressants for the flotation separation of Cu–Fe sulfide minerals at low *** advances include use of inorganic depressants (oxidants and sulfur–oxygen compounds),natural polysaccharides (starch,dextrin,konjac glucomannan,and galactomannan),modified polymers (carboxymethyl cellulose,polyacrylamide,lignosulfonate,and tricarboxylate sodium starch),organic acids (polyglutamic acid,sodium humate,tannic acid,pyrogallic acid,salicylic acid,and lactic acid),sodium dimethyl dithiocarbamate,and *** potential application of specific inorganic and organic depressants in the flotation separation of Cu–Fe sulfide minerals at low alkalinity is *** advances in the use of organic depressants with respect to the flotation separation of Cu–Fe sulfide minerals are comprehensively ***,the depression performances and mechanisms of different types of organic depressants on mineral surfaces are ***,several perspectives on depressants vis-à-vis flotation separation of Cu–Fe sulfide minerals at low alkalinity are proposed.

关键词： Cu–Fe sulfide minerals flotation separation selective depressants depression mechanism

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Metabolic flux simulation of microbial systems based on optimal planning algorithms

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Green Chemical engineering 2023年第2期4卷 146-159页

作者： Chen Yang Boyuan Xue Yiming Zhang Shaojie Wang Haijia Su State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of BioprocessBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China

The genomic scale metabolic networks of the microorganisms can be constructed based on their genome se-quences,functional annotations,and biochemical reactions,reflecting almost all of the metabolic *** simulations of metabolic fluxes could make these functions be visualized,thereby providing guidance for rational engineering design and experimental *** review summarized recently devel-oped flux simulation algorithms of microbial *** the single microbial systems,the optimal planning algorithm has low complexity because there is no interaction between microorganisms,and it can quickly simulate the stable metabolic states through the pseudo-steady ***,the experimental conditions of single microbial systems are easier to reach or close to the optimal states of simulation,compared with pol-ymicrobial *** polymicrobial culture systems could outcompete the single microbial systems as they could relieve metabolic pressure through metabolic division,resource exchange,and complex substrate ***,they provide varieties of intracellular production environments,which render them the po-tential to achieve efficient bioproduct ***,due to the quasi-steady hypothesis that restricts the simulation of the dynamic processes of microbial interactions and the algorithm complexity,there are few re-searches on simulation algorithms of polymicrobial metabolic ***,this review also analyzed and combed the microbial interactions based on the commonly used hypothesis of maximizing growth rates,and studied the strategies of coupling interactions with optimal planning simulations for ***,this review provided new insights into the genomic scale metabolic flux simulations of polymicrobial systems.

关键词： Optimal planning algorithm Metabolic flux simulation Microbial system Interaction

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