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Combinatorial screening via high-throughput preparation:Thermoelectric performance optimization for n-type Bi-Te-Se film with high average zT>1

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Journal of Materials Science & Technology 2023年第29期160卷 18-27页

作者： Guangyu han Wei Zhu Siming Guo Jie Zhou Yutong liu Yuan Deng School of Materials Science and Engineering Beihang UniversityBeijing 100083China Research Institute for Frontier Science Beihang UniversityBeijing 100083China Key laboratory of Intelligent Sensing Materials and Chip Integration Technology of Zhejiang Province(2021E10022) Hangzhou Innovation Institute of Beihang UniversityHangzhou 310052China

Thermoelectric materials have drawn extensive interest due to the direct conversion between electricity and heat,however,it is usually a time-consuming process for applying traditional“sequential”meth-ods to grow materials and investigate their properties,especially for thermoelectric films that typically require fine microstructure ***-throughput experimental approaches can effectively accelerate materials development,but the methods for high-throughput screening of the microstructures require further *** this work,a combinatorial high-throughput optimization solution of material properties is proposed for the parallel screening and optimizing of composition and microstructure,which involves two distinctive types of high-throughput fabrication approaches for thin films,al.ng with a new portable multiple discrete masks based high-throughput preparation ***,Bi_(2)Te_(3-x)Se_(x)thin film library with 196 throughputs for locating the optimized composition is obtained in one growth *** addition,another thin film library composed of 31 materials with traceable process parameters is built to further investigate the relationship between microstructure,process,and thermoelectric *** high-throughput screening,the Bi_(2)Te_(2.9)Se_(0.1)film with(00l)orientation is prepared with a peak zT value of 1.303 at 353 K al.ng with a high average zT value of 1.047 in the interval from 313 to 523 *** method can be also extended to the discovery of other functional thin films with a rapid combinatorial screening of the composition and structure to accelerate material optimization.

关键词： High-throughput preparation Thermoelectric performance Bi-Te-Se film Combinatorial screening

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THE SPACES OF CESRO AlMOST COnVERGEnT SEQUEnCES AnD CORE THEOREMS

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Acta Mathematica Scientia 2012年第6期32卷 2265-2278页

作者： Kuddusi Kayaduman Mehmet Sengönül Science and Art Faculty Gaziantep UniversityGaziantep/Turkey Science and Art Faculty Nev sehir UniversityNev sehir/Turkey

As known, the method to obtain a sequence space by using convergence field of an infinite matrix is an old method in the theory of sequence spaces. However, the study of convergence field of an infinite matrix in the space of almost convergent sequences is so new （see [15]）. The purpose of this paper is to introduce the new spaces ^ ～f and fo consisting of all sequences whose Ceshro transforms of order one are in the spaces f and ^ ～ f0, respectively. Also, in this paper, we show that ^ ～f and ^ ～f0 are l.nearly isomorphic to the spaces f and f0, respectively. The β- and γ-duals of the spaces ^ ～f and 2% are computed. Furthermore, the classes （^ ～f： μ） and （μ ： f） of infinite matrices are characterized for any given sequence space μ, and determined the necessary and sufficient conditions on a matrix A to satisfy Bc-core（Ax） K-core（x）, K-core（Ax） Bg-core（x）, Bc-core（Ax） Be-core（x）, Bc-core（Ax） t-core（x） for all x ∈ t∞.

关键词： almost convergence matrix domain of a sequence space β- and γ-duals andmatrix transformations core theorems isomorphism

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Bamboo-like n-doped carbon nanotubes encapsulating M(Co,Fe)-ni alloy for electrochemical production of syngas with potential-independent CO/H_(2) ratios

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Frontiers of Chemical Science and Engineering 2022年第4期16卷 498-510页

作者： Jinxiao Bo Mei li Xinli Zhu Qingfeng Ge Jinyu han Hua Wang Key laboratory for Green Chemical Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Department of Chemistry and Biochemistry Southern Illinois UniversityCarbondaleIL 62901USA

The electrochemical conversion of CO_(2)-H_(2)O into CO-H_(2) using renewable energy is a promising technique for clean syngas ***-cost electrocatalysts to produce tunable syngas with a potential-independent CO/H_(2) ratio are highly ***,a series of n-doped carbon nanotubes encapsulating binary alloy nanoparticles(Mxni-nCnT,M=Fe,Co)were successfully fabricated through the co-pyrolysis of melamine and metal *** Mxni-nCnT samples exhibited bamboo-like nanotubular structures with a large specific surface area and high degree of *** electrocatalytic performance for syngas production can be tuned by changing the alloy compositions and modifying the electronic structure of the carbon nanotube through the encapsulated metal ***,syngas with a wide range of CO/H_(2) ratios,from 0.5:1 to 3.4:1,can be produced on *** importantly,stable CO/H_(2) ratios of 2:1 and 1.5:1,corresponding to the ratio to produce biofuels by syngas fermentation,could be realized on Co1ni-nCnT and Co2ni-nCnT,respectively,over a potential window of-0.8 to-1.2 V versus the reversible hydrogen *** work provides an approach to develop low-cost and potential-independent electrocatalysts to effectively produce syngas with an adjustable CO/H_(2) ratio from electrochemical CO_(2) reduction.

关键词： electrochemical reduction of CO_(2) syngas n-doped carbon nanotubes encapsulated alloy nanoparticles CO H_(2)ratio

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Direct electrochemical.n-doping to carbon paper in molten liCl-KCl-li3n

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1687-1694页

作者： Dong-hua Tian Zhen-chao han Ming-yong Wang Shu-qiang Jiao State Key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Graphite materials are widely used as electrode materials for electrochemical energy storage.n-doping is an effective method for enhancing the electrochemical properties of graphite.A novel one-step n-doping method for complete and compact carbon paper was proposed for molten salt electrolysis in the li Cl-KCl-li3 n *** results show that the degree of graphitization of carbon paper can be improved by the electrolysis of molten salts,especially at 2.0 *** gas was produced at the anode and nitrogen atoms can substitute carbon atoms of carbon paper at different sites to create nitrogen doping during the electrolysis *** doping content of n in carbon paper is up to 13.0 wt%.There were three groups of nitrogen atoms,*** n(n-Q),pyrrolic n(n-5),and pyridinic n(n-6)in n-doping carbon paper.n-doping carbon paper as an Al-ion battery cathode shows strong charge-recharge properties.

关键词： n-doping carbon paper molten salt electrolysis electrochemical process

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Data-driven models for ground and excited states for Single Atoms on Ceria

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npj Computational Materials 2022年第1期8卷 1636-1643页

作者： Julian Geiger Albert Sabadell-Rendón nathan Daelman núria lópez Institute of Chemical Research of Catal.nia(ICIQ) The Barcelona Institute of Science and Technology(BIST)Avinguda Països Catalans 1643007TarragonaSpain Universitat Rovira i Virgili Avinguda Catalunya3543002TarragonaSpain

Ceria-based single-atom catalysts present complex electronic structures due to the dynamic electron transfer between the metal atoms and the semiconductor oxide *** these materials implies retrieving all states in these electronic ensembles,which can be limiting if done via density functional ***,we propose a data-driven approach to obtain a parsimonious model identifying the appearance of dynamic charge transfer for the single atoms(SAs).We first constructed a database of(701)electronic configurations for the group 9–11 metals on CeO_(2)(100).Feature Selection based on predictive Elastic net and Random Forest models highlights eight fundamental variables:atomic number,ionization potential,size,and metal coordination,metal–oxygen bond strengths,surface strain,and Coulomb *** these variables a Bayesian algorithm yields an expression for the adsorption energies of SAs in ground and low-lying excited *** work paves the way towards understanding electronic structure complexity in metal/oxide interfaces.

关键词： theory excited states

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Enhanced photocatalytic degradation and H_(2) evolution performance of n-CDs/S-C_(3)n_(4)S-scheme heterojunction constructed byπ-πconjugate self-assembly

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Journal of Materials Science & Technology 2022年第19期114卷 222-232页

作者： Xibao li Qiuning luo lu han Fang Deng Ya Yang Fan Dong School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Key laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China CAS Center for Excell.nce in nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China

Constructing heterojunction between two semiconductors with matched energy band structure is an effective modification method to obtain excell.nt *** experimental scheme adopts a simple solvent method to self-assemble nitrogen doped carbon dots(n-CDs)on the surface of sulfur doped carbon nitride(S-C_(3)n_(4))semiconductor throughπ-πconjugate *** on this,a novel 0D/2D S-scheme heterojunction n-CDs/S-C_(3)n_(4)hybrid was successfully *** degradation kinetic constants of n-CDs/S-C_(3)n_(4)for rhodamine B(RhB)and p-nitrophenol(PnP)reached 0.23522 and 0.01342 min^(−1),repectively,which were 2.72 and 2.65 times that of S-C_(3)n_(4).The highest photocatalytic hydrogen evolution rate was observed under the simulated sunlight irradiation,which was 2.30 times that of S-C_(3)n_(4).The improvement of photocatalytic performance was mainly based on the formation of the S-scheme heterojunction between S-C_(3)n_(4)and *** effects of internal electric field,π-πconjugate interaction and band bending promoted the photogenerated h^(+)and e^(−) with low redox ability to recombine and retained the beneficial h+and e−with strong redox ability,which contributed to the production of more active species of h^(+) and•O_(2)−,therefore the photocatalytic degradation and hydrogen evolution performance were significantly enhanced.

关键词： S-scheme Internal electric field Hydrogen evolution C_(3)n_(4) π–πinteraction

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Single-atom Cu anchored on n-doped graphene/carbon nitride heterojunction for enhanced photocatalytic H_(2)O_(2) production

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Journal of Materials Science & Technology 2023年第30期161卷 192-200页

作者： han li Bicheng Zhu Bei Cheng Guoqiang luo Jingsan Xu Shaowen Cao State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430078China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia

Photocatalytic production of H_(2)O_(2) by polymeric carbon nitride has been regarded as a promising ap-proach for the conversion of solar energy into valuable ***,the efficiency of pristine car-bon nitride is limited by the rapid charge recombination and the lack of suitable active ***,we introduce single-atom Cu anchored on n-doped graphene(Cu-nG)as a cocatalyst coupled with carbon nitride via coval.nt bonding to enhance photocatalytic H_(2)O_(2) *** Cu-nG/carbon nitride could broaden the light absorption from UV to near-infrared region,contributing to the photocatalytic ***,nG containing electron-rich n atoms could serve as anchoring sites for stabilizing single-atom ***,the single-atom Cu acts not only as an electron sink to steer the interfacial charge sep-aration but also as an active site for molecular oxygen adsorption and *** the synergistic effect of the enhanced interfacial charge separation and suitable active sites,Cu-nG/carbon nitride ex-hibits improved photocatalytic performance with an H_(2)O_(2) generation rate of 2856μmol g^(−1)h^(−1),which is 2.6 times that of pristine carbon *** work provides a protocol for high-performance photocat-alytic H_(2)O_(2) production using a single-atom cocatalyst.

关键词： Single-atom catalysis Interfacial charge separation Photocatalytic H_(2)O_(2)production

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Fabricating a hollow cuboctahedral structure for n-doped carbon coated p-n heterojunctions towards high-performance photocatalytic organic transformation

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nano Research 2022年第5期15卷 4638-4645页

作者： Hao Gao liming Sun Mengge li Wenwen Zhan Xiaojun Wang Xiguang han Jiangsu Key laboratory of Green Synthetic Chemistry for Functional Materials School of Chemistry and Chemical EngineeringJiangsu Normal UniversityXuzhou 221116China

The application of semiconductors-based photocatalysts in organic transformation has been limited by the low light utilization efficiency and the rapid recombination of photo-induced charge *** this paper,we have successfully fabricated a hollow cuboctahedral.nanostructure(CnnCH),which is composed of n-doped carbon layer and CuO/niO p-n *** hollow structure in CnnCH can effectively favor the light utilization through the multiple light reflection and *** separation of photo-induced charge carriers can be highly improved by the exitence of charge transfer pathways between the p-n heterojunctions and semiconductor/n-doped carbon layer *** to the above advantages,hollow cuboctahedral CnnCH as the photocatalyst has behaved high performance towards the photocatalytic cross-dehydrogenative coupl.ng reaction.

关键词： organic transformation p-n heterojunction n-doped carbon semiconductor hollow structure

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Model.ng and Analysis of novel Integrated Radial Hybrid Magnetic Bearing for Magnetic Bearing Reaction Wheel

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Chinese Journal of Mechanical Engineering 2010年第5期23卷 655-662页

作者： han Bangcheng Key laboratory of novel Inertial Instrument ＆ navigation System Technology of Fundamental Science for national Defense Beihang University Beijing 100191 China School of Instrument Science and Opto-electronics Engineering Beihang University Beijing 100191 China

Conventional ball bearing reaction wheel used to control the attitude of spacecraft can＇t absorb the centrifugal force caused by imbal.nce of the wheel rotor,and there will be a torque spike at zero speed,which seriously influences the accuracy and stability of spacecraft attitude *** with traditional ball-bearing wheel.noncontact and no lubrication are the remarkable features of the magnetic bearing reaction wheel,and which can solve the high precision problems of *** general,two radial magnetic bearings are needed in magnetic bearing wheel,and the design results in a relatively large axial dimension and smaller momentum-to-mass *** this paper,a new type of magnetic bearing reaction wheel（MBRW） is introduced for satellite attitude control,and a novel integrated radial hybrid magnetic bearing（RHMB） with permanent magnet bias is designed to reduce the mass and minimize the size of the MBRW,*** equival.nt magnetic circuit model for the RHMB is presented and a solution is *** stiffness model is also presented,including current stiffness,position negative stiffness,as well as tilting current stiffness,tilting angular position negative stiffness,force and moment equilibrium *** design parameters of the RHMB are given according to the requirement of the MBRW with angular momentum of 30 n ？ m ？ s when the rotation speed of rotor reaches to 5 kr/*** nonl.nearity of the RHMB is shown by using the characteristic curves of force-control current-position,current stiffness,position stiffness,moment-control current-angular displacement,tilting current stiffness and tilting angular position stiffness considering all the rotor position within the clearance space and the control *** proposed research ensures the performance of the radial magnetic bearing with permanent magnet bias,and provides theory basis for design of the magnetic bearing wheel.

关键词： magnetic bearing reaction wheel radial hybrid magnetic bearing equival.nt magnetic circuit current stiffness position negative stiffness tilting current stiffness tilting angular position stiffness

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Anthracene Removal and Mineral.n Dynamics in a Surfactant-Amended Soil

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Pedosphere 2014年第6期24卷 783-790页

作者： M.R.CRDEnAS-AQUInO G.SAlOMón-HERnnDEZ .AGUIlAR-CHVEZ M.l.l.nA-GUIDO R.MARSCH l.DEnDOOVEn laboratory of Soil Ecology Department of Biotechnology and BioengineeringCinvestavMexico D.F.C.P.07360 (Mexico)

Surfactants, such as non-ionic Surfynol 485 （ethoxylated 2,4,7,9-tetramethyl-5-decyne-4,7-diol）, have been applied to accelerate removal of polycyclic aromatic hydrocarbons from soil. This study investigated the dissipation of anthracene, and carbon （C） and nitrogen （n） mineralization in soil amended with non-ionic Surfynol 485 at different rates. Soil samples of a Typic Fragiudept taken from Otumba, Mexico were spiked with anthracene at a final concentration of 520 mg kg^-1 dry soil using acetone as solvent, amended with 0.0, 24.9, 49.8 or 124.4 g kg^-1 soil of the surfactant and incubated in the laboratory. The soil.not amended with anthracene, acetone and the surfactant was used as a control. Dynamics of C and n and the concentration of anthracene were monitored for 56 d. After 56 d of incubation, 38% of the anthracene was removed from the unamended soil, and 47%, 55% and 66% of the anthracene were removed when 24.9, 49.8 and 124.4 g kg^-1 of the surfactant were applied, respectively. Application of acetone, anthracene or surfactant increased the emission of CO2, but decreased the mineral.n compared to the unamended control. Applying the surfactant to the acetone or anthracene-amended soil reduced emission of CO2, but increased the mineral.n at the lower application rates of the surfactant. It was found that the application of the non-ionic surfactant increased the bioavailability of anthracene and thus its removal from soil, increased C mineralization, but decreased n miaeralization. Consequently, the application of non-ionic surfactant could be easily used to accelerate the removal of pollutants from hydrocarbon-contaminated soils, but mineral.n in the soil would decrease, which might inhibit pl.nt growth.

关键词： acetone anthracene bioavailability C mineralization CO2 emission non-ionic surfactant Surfynol 485 polycyclic aromatic hydrocarbons

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