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High-power biofuel cells based on threedimensional reduced graphene oxide/carbon nanotube micro-arrays

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Microsystems & Nanoengineering 2019年第1期5卷 227-237页

作者： Yin Song chunlei wang Department of Mechanical and Materials Science Engineering Florida International University10555 West Flagler StreetMiamiFL 33174USA

Miniaturized enzymatic biofuel cells(EBFCs)with high cell performance are promising candidates for powering nextgeneration implantable medical ***,we report a closed-loop theoretical and experimental study on a micro EBFC system based on three-dimensional(3D)carbon micropillar arrays coated with reduced graphene oxide(rGO),carbon nanotubes(CNTs),and a biocatalyst *** fabrication process of this system combines the top–down carbon microelectromechanical systems(C-MEMS)technique to fabricate the 3D micropillar array platform and bottom–up electrophoretic deposition(EPD)to deposit the reduced rGO/CNTs/enzyme onto the electrode *** Michaelis–Menten constant K_(M)of 2.1 mM for glucose oxidase(GOx)on the rGO/CNTs/GOx bioanode was obtained,which is close to the K_(M)for free *** modelling of the rGO/CNT-based EBFC system via finite element analysis was conducted to predict the cell performance and *** experimental results from the developed rGO/CNT-based EBFC showed a maximum power density of 196.04μW cm−2 at 0.61 V,which is approximately twice the maximum power density obtained from the rGO-based *** experimental power density is noted to be 71.1%of the theoretical value.

关键词： graphene carbon power

Synthesis,Electrical Conductivity and Seebeck Coefficient of La_(0.9)A_(0.1)FeO_3(A=Mg,Ca,Sr,Ba)

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Journal of Materials Science & Technology 2010年第12期26卷 1103-1106页

作者： Na Yin Hongchao wang chunlei wang School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Lanthanum ferrites ceramics La0.9A0.1FeO3 （A=Mg, Ca, Sr, Ba） have been prepared by solid state reaction. X-ray power diffraction analysis reveals that all samples are of pure perovskite structure with orthorhombic phase. Electrical conductivity and Seebeck coefficient have been measured in vacuum within the temperature range between room temperature and 800℃. The electrical conductivity shows semiconducting behavior. Temperature dependence of electrical conductivity indicates that adiabatic small-polaron hopping mechanism is dominant for their electric transportations. Seebeck coefficients are positive for samples, suggesting ptype conduction in the whole temperature range. The highest Seebeck coefficient is found to be 654 μV/K for La0.9A0.1FeO3. Except La0.9A0.1FeO3, the electrical conductivity of La0.9A0.1FeO3 increases with increasing atomic number of the A-site element, while Seebeck coefficient decreases.

关键词： La0.9A0.1FeO3 ceramics Electrical conductivity Seebeck coefficient

Recent advances on “ordered water monolayer that does not completely wet water” at room temperature

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Science China(Physics,Mechanics & Astronomy) 2014年第5期57卷 802-809页

作者： wang chunlei YANG YiZhou FANG HaiPing Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

The molecular scales behavior of interracial water at the solid/liquid interfaces is of a fundamental significance in a diverse set of technical and scientific contexts, ranging from the efficiency of oil mining to the activity of biological molecules. Recently, it has become recognized that, both the physical interactions and the surface morphology have significant impact on the behavior of inter- facial water, including the water structures as well as the wetting properties of the surface. In this review, we summarize some of recent advances in the atom-level pictures of the interfacial water, which exhibits the ordered character on various solid surfaces at room or cryogenic temperature. Special focus has been devoted to the wetting phenomenon of ＂ordered water monolayer that does not completely wet water＂ and the underlying mechanism on model and some real solid surfaces at room temperature. The possible applications of this phenomenon are also discussed.

关键词： ordered water monolayer hydrophobicity/hydrophilicity molecular dynamics simulation hydrogen bond room temperature

First-principle study on the physical properties of ultra-incompressible ReB_2

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Acta Metallurgica Sinica(English Letters) 2009年第4期22卷 284-290页

作者： chunlei wang Qiuju SUN Xuanyu SONG Benhai YU College of Physics and Electronic Engineering Xinyang Normal University Xinyang 464000 China

The elastic and physical characteristics of ReB2 crystal have been predicted through a method of density functional theory within the generalized gradient approximation （GGA）. Five independent elastic constants are C11=662 GPa, C12=150 GPa, C13=146 GPa, C33=1090 GPa and Caa=263 GPa. The bulk modulus （B）, shear modulus （G）, Young＇s modulus （E）, Poisson＇s ratio （γ） and the ratio of linear com- pressibility coefficient along the a- and c-axis crystal direction （Ka/Kc） are 356 GPa, 305 GPa, 711 GPa, 0.167 and 1.758, respectively. In addition, the dependence of bulk modulus （B） on temperature （T） and pressure （p） as well as the coefficient of thermal expansion （αL） at various temperatures are evaluated and discussed. The coefficient of thermal expansion is consistent with the famous Grüneisen＇s law when the temperature is less than 1500 K. Our results agree well with the other experimental results.

关键词： Rhenium diboride Density functional calculations Bulk modulus Coefficient of thermal expansion

A strategy for highly dispersed Mo2C/MoN hybrid nitrogen- doped graphene via ion-exchange resin synthesis for efficient electrocatalytic hydrogen reduction

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Nano Research 2018年第9期11卷 4535-4548页

作者： Jiabo wang Weilin Chen Ting wang Nasen Bate chunlei wang Enbo wang Key Laboratory of Polyoxometalate Science of the Ministry of Education Faculty of Chemistry Northeast Normal University Changchun 130024 China Autonomous Region Level Experimental Teaching Demonstration Center Yili Normal University Wning 835000 China Library of Northeast Normal University Changchun 130024 China

Molybdenum carbide/molybdenum nitride hybrid N-doped graphene （abbreviated as Mo2C/MoN/NG）, as an efficient electrocatalyst for the hydrogen evolution reaction （HER）, was synthesized via simple ion-exchange resin synthesis followed by a two-step annealing process, which increased the dispersion degree of the electrocatalyst＇s active sites on the support skeleton and simplified the synthetic conditions. Additionally, N-doped graphene （NG） enhanced the electron transfer and reduced the inner resistance. The material has a graphene-like morphology and highly dispersed Mo2C/MoN nanoparticles about 2 nm in diameter on the NG. X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy revealed that Mo2C/MoN/NG consisted of Mo2C and MoN composited together. Finally, Mo2C/MoN/NG exhibited remarkable performance as an electrocatalyst for the HER with a small overpotential of 78.82 mV and a small Tafel slope of 39.3 ***^-1 in a 0.5 mol.L-1 H2SO4 solution. Its activity was approximately 30% lower than that of 20% Pt/C and 60% higher than that of NG. Also, it exhibited a low onset overpotential of 24.82 mV, which is similar to the theoretical HER potential. Our work provides a foundation for advanced HER applications of molybdenum compounds.

关键词： polymolybdate hydrogen evolution reaction ion exchange electrocatalyst Tafel slope

System-size effect on the friction at liquid-solid interfaces

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 471-478页

作者： Liang ZHAO Jiajia SUN Xian wang Li ZENG chunlei wang Yusong TU College of Physical Science and Technology Yangzhou UniversityYangzhou 225009Jiangsu ProvinceChina School of Physics and Electronics Nanning Normal UniversityNanning 530023China Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China

The friction at the liquid-solid interfaces is widely involved in various phenomena ranging from nanometer to micrometer scales. By the molecular dynamic(MD)simulation, the friction properties of liquid-solid interfaces at the molecular level are calculated via the Green-Kubo relation. It is found that the system size will influence the value of the friction coefficient, especially for the solid surfaces with the larger polar charge. The value of the friction coefficient decreases with the increase in the system size and converges at large system sizes. The large polar charge will lead to a significant friction coefficient. However, the diffusion of water molecules on this surface is almost a constant, indicating that the diffusion coefficient seems to be independent of the system size and polar charge. This work provides insights for the selection of the system size in modeling the frictional properties of hydrophobic/hydrophilic surfaces.

关键词： Green-Kubo relation liquid-solid interface system-size effect friction coefficient

Lamellar water induced quantized interlayer spacing of nanochannels walls

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Green Energy & Environment 2024年第2期9卷 356-365页

作者： Yue Zhang Chenlu wang chunlei wang Yingyan Zhang Junhua Zhao Ning Wei Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi214122China Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas Ministry of EducationNorthwest A&F UniversityYangling712100China Zhangjiang Lab Interdisplinary Research CenterShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800China Mechanical&Automotive Engineering School of EngineeringRMIT UniversityBundooraMelbourneVICVIC 3083Australia

The nanoscale confinement is of great important for the industrial applications of molecular sieve,desalination,and also essential in bio-logical transport *** efforts have been devoted to the influence of restricted spaces on the properties of confined ***,the situation of channel-wall is crucial but attracts less attention and remains *** fundamentally understand the mechanism of channel-walls in nanoconfinement,we investigated the interaction between the counter-force of the liquid and interlamellar spacing of nanochannel walls by considering the effect of both spatial confinement and surface *** results reveal that the nanochannel stables at only a few discrete spacing states when its confinement is within 1.4 *** quantized interlayer spacing is attributed to water molecules becoming laminated structures,and the stable states are corresponding to the monolayer,bilayer and trilayer water configurations,*** results can potentially help to understand the characterized interlayers spacing of graphene oxide membrane in *** findings are hold great promise in design of ion filtration membrane and artificial water/ion channels.

关键词： Nanoconfinement Quantized spacing Lamellar water layer MD simulations Entropy force

Inverse single-site Fe_(1)(OH)_(x)/Pt(111)model catalyst for preferential oxidation of CO in H_(2)

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Nano Research 2022年第1期15卷 709-715页

作者： chunlei wang Heloise Tissot Markus Soldemo Junling Lu Jonas Weissenrieder Materials and Nano Physics School of Engineering SciencesKTH Royal Institute of TechnologyStockholm SE-10044Sweden Department of Engineering and Physics Karlstad UniversityKarlstad SE-65188Sweden Department of Chemical Physics Hefei National Laboratory for Physical Sciences at the MicroscaleKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei 230026China

Inverse oxide/metal model systems are frequently used to investigate catalytic structure-function relationships at an atomic *** means of a novel atomic layer deposition process,growth of single-site Fe_(1)O_(x) on a Pt(111)single crystal surface was achieved,as confirmed by scanning tunneling microscopy(STM).The redox properties of the catalyst were characterized by synchrotron radiation based ambient pressure X-ray photoelectron spectroscopy(AP-XPS).After calcination treatment at 373 K in 1 mbar O_(2).the chemical state of the catalyst was determined as Fe^(3+).Reduction in 1 mbar H_(2) at 373 K demonstrates a facile reduction to Fe2+and complete hydroxylation at significantly lower temperatures than what has been reported for iron oxide *** reaction conditions relevant for preferential oxidation of CO in H_(2)(PROX),the catalyst exhibits a Fe3+state(ferric hydroxide)at 298 K while re-oxidation of iron oxide clusters does not occur under the same *** oxidation proceeds on the single-site Fei(OH)3 through a mechanism including the loss of hydroxyl groups in the temperature range of 373 to 473 K,but no reaction is observed on iron oxide *** results highlight the high flexibility of the single iron atom catalyst in switching oxidation states,not observed for iron oxide nanoparticles under similar reaction conditions,which may indicate a higher intrinsic activity of such single interfacial sites than the conventional metal-oxide *** summary,our findings of the redox properties on inverse single-site iron oxide model catalyst may provide new insights into applied Fe-Pt catalysis.

关键词： inverse single-site model catalyst Fe_(1)O_(x)/PPt(111) PROX atomic layer deposition synchrotron radiation AP-XPS STM

Molecular simulation study of the adhesion work for water droplets on water monolayer at room temperature

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Chinese Physics B 2021年第10期30卷 476-480页

作者： Mengyang Qu Bo Zhou chunlei wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Electronic Engineering Chengdu Technological UniversityChengdu 611730China Zhangjiang Laboratory Interdisplinary Research CenterShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China

The wetting phenomenon of water droplets coexisting with the ordered water monolayer termed an unexpected phenomenon of“water that does not wet a water monolayer”at room temperature has been found on several solid *** the hydrogen bond saturation inside the monolayer can qualitatively describe this phenomenon,whether the Young-Dupre equation still holds under this unconventional wetting framework is still not *** this work,we have´calculated the contact angle values of the droplets as well as the work of adhesion between the droplets and the monolayer based on an extended phantom-wall *** results show that similar to the conventional solid-liquid interface,classical Young-Dupre equation is also applicable for the interface of liquid water and ordered water monolayer.

关键词： wetting work of adhesion contact angle water