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Electrocatalytic and photocatalytic performance of noble metal doped monolayer MoS2 in the hydrogen evolution reaction: A first principles study

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Nano Materials Science 2021年第1期3卷 89-94页

作者： Zheng Zhang Kai Chen Qiang Zhao mei Huang Xiaoping ouyang Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power UniversityBeijing102206China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing102206China Northwest Institute of Nuclear Technology Xi'an710024China School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China

To maximize the catalytic performance of MoS_(2) in the hydrogen evolution reaction,we investigate the electrocatalytic and photocatalytic performance of monolayer MoS_(2) doped with noble metal(Ag,Au,Cu,Pd,and Pt)using first principles calculation combined with the climbing image nudged elastic band *** find the band gap of the monolayer MoS_(2) is reduced significantly by the noble metal doping,which is unfavorable to improving its photocatalytic *** optical absorption coefficient shows that the doping does not increase the ability of the monolayer MoS_(2) to absorb visible *** monolayer MoS_(2) doped with the noble metal is not a potential photocatalyst for the hydrogen evolution reaction because the band edge position of the conduction band minimum is lower than-4.44 eV,the reduction potential of H^(+)/H_(2).Fortunately,the band gap reduction increases the electron transport performance of the monolayer MoS_(2),and the activation energy of water splitting is greatly reduced by the noble metal doping,especially the Pt *** the whole,noble metal doping can enhance the electrocatalytic performance of the monolayer MoS_(2).

关键词： Electrocatalytic Monolayer MoS2 Noble metal doping Hydrogen evolution reaction First principles calculation

A Review on Nanomaterial-based Strategies for Manipulating Tumor Microenvironment to Enhance Chemodynamic Therapy

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Chemical Research in Chinese Universities 2024年第2期40卷 202-212页

作者： CAO Mengyu xing Xiner SHEN Xiaotong ouyang Jin NA Na Key Laboratory of Radiopharmaceuticals Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing100875P.R.China Department of Chemistry College of Arts and SciencesBeijing Normal University at ZhuhaiZhuhai519087P.R.China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430074P.R.China

Cancer is a leading cause of death worldwide,and a series of strategies has been reported for tumor-specific ***,chemodynamic therapy(CDT)has become a research hotspot for antitumor treatment due to its advantages of high specificity,endogenous stimulation,and high ***,the therapeutic effects of CDT are normally limited in the complex tumor microenvironment(TME),such as insufficient acidity,tumor hypoxia,low hydrogen peroxide(H2O2),and high glutathione(GSH).Consequently,different kinds of multifunctional nanomaterials have been designed to manipulate TME conditions,which provided more opportunities to improve the efficiency of *** review focuses on nanomaterial-based strategies for enhancing CDT through manipulating *** CDT enhancements,this review would provide a reference for the future development of efficient CDT nanomaterials.

关键词： Chemodynamic therapy Tumor microenvironment Nanomaterial Manipulating strategy Fenton/Fenton-like reaction

Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe_(2) crystals

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Nano Research 2024年第11期17卷 10170-10178页

作者： Junnan Ding xing Xie Xinyu ouyang Junying Chen Fangping ouyang Zongwen Liu Jian-Tao Wang Jun He Yanping Liu Institute of Quantum Physics School of Physics Central South University Changsha 410083 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University Changsha 410083 China School of Physics and Technology State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang University Urumqi 830046 China School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia The University of Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan 523808 China

Pressure exerts a profound influence on atomic configurations and interlayer interactions, thereby modulating the electronic and structural properties of materials. While high pressure has been observed to induce a structural phase transition in bulk PdSe_(2) crystals, leading to a transition from semiconductor to metal, the high-pressure behavior of few-layer PdSe_(2) remains elusive. Here, employing diamond anvil cell (DAC) techniques and high-pressure Raman spectroscopy, we investigate the structural evolution of layer-dependent PdSe_(2) under high pressure. We reveal that pressure significantly enhances interlayer coupling in PdSe_(2), driving structural phase transitions from an orthorhombic to a cubic phase. We demonstrate that PdSe_(2) crystals exhibit distinct layer-dependent pressure thresholds during the phase transition, with the decrease of transition pressure as the thickness of PdSe_(2) increases. Furthermore, our results of polarized Raman spectra confirm a reduction in material anisotropy with increasing pressure. This study offers crucial insights into the structural evolution of layer-dependent van der Waals materials under pressure, advancing our understanding of their pressure-induced behaviors.

关键词： palladium diselenide high pressure phase transition diamond anvil cell anisotropy

Thermoelastic stress analysis of multilayered films in a micro-thermoelectric cooling device

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Acta Mechanica Sinica 2012年第6期28卷 1644-1650页

作者： Yu-mei Yang xing-Zhe Wang Wen-Jie Zhang Key Laboratory of Mechanics on Environment and Disaster in Western China The Ministry of Education of China College of Civil Engineering and Mechanics Lanzhou University

This paper presents an analytical solution for the thermoelastic stress in a typical in-plane＇s thin-film micro- thermoelectric cooling device under different operating con- ditions. The distributions of the permissible temperature fields in multilayered thin-films are analytically obtained, and the characteristics, including maximum temperature dif- ference and maximum refrigerating output of the thermo- electric device, are discussed for two operating conditions. Analytical expressions of the thermoelastic stresses in the layered thermoelectric thin-films induced by the tempera- ture difference are formulated based on the theory of mul- tilayer system. The results demonstrate that, the geometric dimension is a significant factor which remarkably affects the thermoelastic stresses. The stress distributions in layers of semiconductor thermoelements, insulating and support- ing membrane show distinctly different features. The present work may profitably guide the optimization design of high- efficiency micro-thermoelectric cooling devices.

关键词： Thermoelectric cooling device Multilayeredthin-film Thermoelastic stress - Analytical solution

On the Seidel Integral Complete Multipartite Graphs

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 705-710页

作者： Sheng-mei LV Liang WEI Hai-xing ZHAO Department of Mathematics Qinghai Nationality University Department of Mathematics Qinghai Normal University

For a simple undirected graph G, denote by λ（G） the （0, 1）-adjacency matrix of G. Let the matrix S（G） = J-I-2A（G） be its Seidel matrix, and let SG（A） = det（AI-S（G）） be its Seidel characteristic polynomial, where I is an identity matrix and J is a square matrix all of whose entries are equal to 1. If all eigenvalues of SG（λ） are integral, then the graph G is called S-integral, In this paper, our main goal is to investigate the eigenvalues of SG（A） for the complete multipartite graphs G = Kn1,n2,...,n,. A necessary and sufficient condition for the complete tripartite graphs Km,n,t and the complete multipartite graphs Km,.... m,n,...,n to be S-integral is given, respectively.

关键词： S-polynomial S-integral complete multipartite graphs

Efficient coupling of evanescent waves in rectangular waveguides based on ultrathin planar capacitive metasurfaces

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Science China(Information Sciences) 2021年第8期64卷 182-194页

作者： Da YI Ming-Chun TANG mei LI xing-Chang WEI College of Microelectronics and Communication Engineering Chongqing University Zhejiang Provincial Key Laboratory of Advanced Microelectronic Intelligent Systems and Applications College of Information Science and Electronic Engineering Zhejiang University

This work proposes an approach to enable efficient coupling of evanescent waves below the cutoff frequency of a standard rectangular waveguide(RWG) system based on ultrathin planar capacitive metasurfaces(CMSs). It is demonstrated that the CMS at the RWG’s cross-section can couple the evanescent wave from one port to the other, and thus enable an efficient frequency-selective transmission below the cutoff frequency. Theoretical formulas, together with the equivalent circuit, are presented to quantitatively illustrate the operational mechanism of the proposed approach. The performance characteristics, including out-of-band suppression, Q-factor, transmission loss, and coupling bandwidth, are studied in a comprehensive manner. Three CMS samples with different surface impedance values are designed, fabricated, and *** measurement results show good agreement with the numerical values, validating their highly efficient evanescent wave coupling performance characteristic at selected frequencies below the cutoff frequency, with approximately 100% transmission efficiency. Benefiting from the admirable low-frequency coupling performance,this approach has potential applications in many miniaturized and high-performance transmission components, such as compact evanescent wave resonators, filters, and antennas.

关键词： cutoff frequency capacitive metasurface evanescent wave miniaturized components rectangular waveguide

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Adsorption removal of sulfamethoxazole from water using UiO-66 and UiO-66-BC composites

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Particuology 2022年第3期20卷 71-78页

作者： Jinbo ouyang Jian Chen Shaoqing Ma Xiaohong xing Limin Zhou Zhirong Liu Chuntao Zhang Jiangxi Province Key Laboratory of Synthetic Chemistry East China University of TechnologyNanchang 330013China School of Chemistry and Chemical Engineering Wuhan University of Science and TechnologyWuhan 430081China

The adsorption removal of anti-inflammatory drugs from water by diverse materials has drawn great *** study investigated the adsorption of sulfamethoxazole(SMX)by two types of materials,UiO-66 and UiO-66-BC *** porous MOF composites with functional groups were synthesized by combining UiO-66 with corncob-based biochar at different molar *** results showed that macroporosity of UiO-66-BC composites was increased by increasing the ratio of *** was found that UiO-66-BC composites displayed highly improved adsorption performance of SMX relative to pristine ***-66-BC(5%)had the highest SMX adsorption capacity,about 2.4 times those of pristine *** was the high surface area of UiO-66 and redundant functional groups of biochar that increased the adsorption performance of ***,UiO-66-BC can be reused and displayed the competitive adsorption efficiency after successive adsorption,which made it a potential adsorbent for the removal of SMX from water.

关键词： Adsorption UiO-66 Biochar Sulfamethoxazole

Carbon Balance in an Alpine Steppe in the Qinghai-Tibet Plateau

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Journal of Integrative Plant Biology 2009年第5期51卷 521-526页

作者： Zhi-Yong Pei Hua ouyang Cai-Ping Zhou xing-Liang Xu The Administrative Center for China's Agenda 21 Beijing 100038 China Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research the Chinese Academy of Sciences Beijing 100101 China

Carbon fluxes were measured using a static chamber technique in an alpine steppe in the Qinghai-Tibet Plateau from July 2000 to July 2001. It was shown that carbon emissions decreased in autumn and increased in spring of the next year, with higher values in growth seasons than in winters. An exponential correlation （Ecarbon = 0.22（exp（0.09T）＋ In（0.31P ＋ 1））, R^2 = 0.77, P 〈 0.001） was shown between carbon emissions and environmental factors such as temperature （T） and precipitation （P）. Using the daily temperature （T） and total precipitation （R）, annual carbon emission from soil to the atmosphere was estimated to be 79.6 g C/m^2, 46% of which was emitted by microbial respiration. Considering an average net primary production of 92.5 g C/m^2 per year within the 2 year experiment, alpine steppes can take up 55.9 g CO2-C/m^2 per year. This indicates that alpine steppes are a distinct carbon sink, although this carbon reservoir was quite small.

关键词： alpine grassland carbon balance carbon flux net primary productivity Qinghai-Tibet Plateau

Handwritten digit recognition based on ghost imaging with deep learning

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Chinese Physics B 2021年第5期30卷 367-372页

作者： xing He Sheng-mei Zhao Le Wang Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing 210003China

We present a ghost handwritten digit recognition method for the unknown handwritten digits based on ghost imaging(GI)with deep neural network,where a few detection signals from the bucket detector,generated by the cosine transform speckle,are used as the characteristic information and the input of the designed deep neural network(DNN),and the output of the DNN is the *** results show that the proposed scheme has a higher recognition accuracy(as high as 98%for the simulations,and 91%for the experiments)with a smaller sampling ratio(say 12.76%).With the increase of the sampling ratio,the recognition accuracy is *** with the traditional recognition scheme using the same DNN structure,the proposed scheme has slightly better performance with a lower complexity and non-locality *** proposed scheme provides a promising way for remote sensing.

关键词： ghost imaging handwritten digit recognition ghost handwritten recognition deep learning