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Amorphous high-entropy phosphoxides for efficient overall alkaline water/seawater splitting

Journal of Materials science & technology 2024年第6期173卷 1-10页

作者： Han-Ming zhang Lihao Zuo Yuhang Gao Junxia guo Caizhen Zhu Jian Xu Jinfeng Sun School of Materials science and Engineering Hebei University of Science and TechnologyShijiazhuangHebei 050018China Hebei Key Laboratory of Flexible Functional Materials ShijiazhuangHebei 0500180China Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhenGuangdong 518060China

Designing and synthesizing cost-effective bifunctional catalysts for overall alkaline water/seawater splitting is still a huge challenge for hydrogen ***,Co/Ni/Fe/Mn based-amorphous high-entropy phosphoxide self-standing electrode(CNFMPO)is synthesized by the facile and fast electrodeposition *** exhibits excellent bifunctional electrocatalytic performances on alkaline water/seawater *** hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)overpotentials of CNFMPO in alkaline water/seawater are as low as 43/73 and 252/282 mV to reach a current density of 10 mA cm^(-2),***,two-electrode electrolyzers with CNFMPO||CNFMPO successfully achieve the current density of 10 mA cm^(-2) at low voltages of 1.54 and 1.56 V for overall alkaline water/seawater splitting,*** exhibits satisfactory long-term stability on overall alkaline water/seawater splitting for the surface reconstruction into active metal hydroxide/(oxy)hydroxide,phosphite,and ***,no hypochlorite is detected during seawater electrolysis for the beneficial chlorite oxidation inhibition of the reconstructed phosphite and *** excellent catalytic performances of CNFMPO are due to the unique amorphous structure,multi-component synergistic effect,beneficial electronic structure modulation,and surface reconstruction during the catalytic reaction ***,CNFMPO has shown potential promotion to the development of the water/seawater splitting industry as a promising substituent for noble-metal *** work provides new insights into the design of efficient bifunctional catalysts for overall water/seawater splitting.

关键词： Amorphous high-entropy phosphoxides Water/seawater splitting Synergistic effect Surface reconstruction Electronic structure modulation Inhibition of chloride oxidation reaction

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Analyze the Performance of Electroactive Anticorrosion Coating of Medical Magnesium Alloy Using Deep Learning

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Computers, Materials & Continua 2024年第4期79卷 263-278页

作者： Yashan Feng Yafang Tian Yongxin Yang Yufang zhang Haiwei guo Jing’an Li Advanced Functional Materials Laboratory Zhengzhou Railway Vocational and Technical CollegeZhengzhou450000China School of Materials science and Engineering Zhengzhou UniversityZhengzhou450000China

Electroactive anticorrosion coatings are specialized surface treatments that prevent or minimize corrosion. Thestudy employs strategic thermodynamic equilibriumcalculations to pioneer a novel factor in corrosion protection.A first-time proposal, the total acidity (TA) potential of the hydrogen (pH) concept significantly shapes medicalmagnesium alloys. These coatings are meticulously designed for robust corrosion resistance, blending theoreticalinsights and practical applications to enhance our grasp of corrosion prevention mechanisms and establisha systematic approach to coating design. The groundbreaking significance of this study lies in its innovativeintegration of the TA/pH concept,which encompasses the TA/pH ratio of the chemical environment. This approachsurpasses convention by acknowledging the intricate interplay between the acidity and pH levels within thecoating formulation, thereby optimizing metal-phosphate-based conversion coatings and transforming corrosionmitigation strategies. To authenticate the TA/pH concept, the study comprehensively compares its findings withexisting research, rigorously validating the theoretical framework and reinforcing the correlates among TA/pHvalues and observed corrosion resistance in the coatings. The influence of mutations that occur naturally inthe detergent solution on persistent phosphorus changes is shown by empirical confirmation, which improvescorrosion resistance. This realization advances the field ofmaterials and the field’s knowledge of coated generation,particularly anticorrosion converter layers.

关键词： Medical magnesium alloys hydrogen gas anticorrosion total acidity potential of the hydrogen(pH)

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Milestone progress of the HEPS booster commissioning

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Nuclear science and Techniques 2024年第1期35卷 170-177页

作者： Yue-Mei Peng Jian-She Cao Jin-Hui Chen Hai-Yi Dong ping He Yi Jiao Ling Kang Wen Kang Jian Li Jing-Yi Li guo-ping Lin Fang Liu Feng-Li Long Cai Meng Xin Qi Hua-Min Qu Yan-Feng Sui Sheng Wang Gang Xu Qiang Ye Jing zhang Pei zhang Wei-Min Pan Key Laboratory of Particle Acceleration physics and technology Institute of High Energy PhysicsChinese Academy of Sciences19B Yuquan RoadShijingshan DistrictBeijing 100049China University of the Chinese Academy of sciences 19A Yuquan RoadShijingshan DistrictBeijing 100049China

The high-energy photon source(HEPS)is the first fourth-generation synchrotron light source facility in *** HEPS injector consists of a linear accelerator(Linac)and a full energy *** booster captures the electron beam from the Linac and increases its energy to the value required for the storage *** full-energy beam could be injected to the storage ring directly or after“high-energy accumulation.”On November 17,2023,the key booster parameters successfully reached their corresponding target *** milestone results were achieved based on numerous contributions,including nearly a decade of physical design,years of equipment development and installation,and months of beam *** measured at the extraction energy of 6 GeV,the averaged beam current and emittance reached 8.57 mA with 5 bunches and 30.37 nm rad with a single-bunch charge of 5.58 nC,compared with the corresponding target values of 6.6 mA and 35 nm rad,*** paper presents the physical design,equipment development,installation,and commissioning process of the HEPS booster.

关键词： High energy photon source booster beam commissioning

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Acarbose glycosylation by AcbE for the production of acarstatins with enhancedα-amylase inhibitory activity

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Synthetic and Systems biotechnology 2024年第2期9卷 359-368页

作者： Xin zhang Qungang Huang Ziyue guo Feifei Cai Qianjin Kang Linquan bai State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai200240China college of Life science Tarim UniversityAlar843300China

Acarbose is a potent glycosidase inhibitor widely used in the clinical treatment of type 2 diabetes mellitus(T2DM).Various acarbose analogs have been identified while exploring compounds with improved pharmacological *** this study,we found that AcbE from Actinoplanes ***50/110 catalyzes the production of acarbose analogs that exhibit significantly improved inhibitory activity towardsα-amylase than *** AcbE mainly catalyzed the formation of two new compounds,namely acarstatins A and b,using acarbose as *** high-resolution mass spectrometry,nuclear magnetic resonance,and glycosidase hydrolysis,we elucidated their chemical structures as O-α-d-maltosyl-(1→4)-acarbose and O-α-d-maltotriosyl-(1→4)-acarbose,*** A and b exhibited 1584-and 1478-fold greater inhibitory activity towards human salivaryα-amylase than ***,both acarstatins A and b exhibited complete resistance to microbiome-derived acarbose kinase 1-mediated phosphorylation and partial resistance to acarbose-preferred glucosidase-mediated ***,acarstatins A and b have great potential as candidate therapeutic agents for T2DM.

关键词： Acarbose analogs α-amylase inhibitory activity Actinoplanes sp. Transglycosylase

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Improving Satellite-Retrieved Cloud base Height with Ground-based Cloud Radar Measurements

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Advances in Atmospheric sciences 2024年第11期41卷 2131-2140页

作者： Zhonghui TAN Ju WANG Jianping guo Chao LIU Miao zhang Shuo MA college of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China National Satellite Meteorological Center(National Center for Space Weather) China Meteorological AdministrationBeijing 100081China

Cloud base height(CbH) is a crucial parameter for cloud radiative effect estimates, climate change simulations, and aviation guidance. However, due to the limited information on cloud vertical structures included in passive satellite radiometer observations, few operational satellite CbH products are currently available. This study presents a new method for retrieving CbH from satellite radiometers. The method first uses the combined measurements of satellite radiometers and ground-based cloud radars to develop a lookup table(LUT) of effective cloud water content(ECWC), representing the vertically varying cloud water content. This LUT allows for the conversion of cloud water path to cloud geometric thickness(CGT), enabling the estimation of CbH as the difference between cloud top height and CGT. Detailed comparative analysis of CbH estimates from the state-of-the-art ECWC LUT are conducted against four ground-based millimeter-wave cloud radar(MMCR) measurements, and results show that the mean bias(correlation coefficient) is0.18±1.79 km(0.73), which is lower(higher) than 0.23±2.11 km(0.67) as derived from the combined measurements of satellite radiometers and satellite radar-lidar(i.e., Cloud Sat and CALIPSO). Furthermore, the percentages of the CbH biases within 250 m increase by 5% to 10%, which varies by location. This indicates that the CbH estimates from our algorithm are more consistent with ground-based MMCR measurements. Therefore, this algorithm shows great potential for further improvement of the CbH retrievals as ground-based MMCR are being increasingly included in global surface meteorological observing networks, and the improved CbH retrievals will contribute to better cloud radiative effect estimates.

关键词： cloud base height passive radiometer ground-based cloud radar remote sensing

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Time-energy distribution of photoelectron from atomic states with different magnetic quantum numbers in elliptically polarized laser fields

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Chinese physics b 2024年第9期33卷 374-382页

作者： Jingyang Xu Li guo Xin Qi Ronghua Lu Min zhang Jingtao zhang Jing Chen Department of physics Shanghai Normal UniversityShanghai 200234China Key Laboratory for Quantum Optics and Center for Cold Atom physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hefei National Research Center for Physical sciences at the Microscale and School of Physical sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material technology College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

A Wigner-distribution-like(WDL)function based on the strong-field approximation(SFA)theory is used to investigate the ionization time of the photoelectron emitted from the initial states with different magnetic quantum number m in elliptically polarized electric *** saddle-point method is adopted for *** different m states,a discrepancy exists in the WDL distributions of the photoelectrons emitted in a direction close to the major axis of the laser field *** on the saddle-point analysis,this discrepancy can be ascribed to the interference between electrons ionized from two tunneling *** results show that the relationships between the tunneling instants and kinetic energy of photoelectrons are the same for different m initial states when the Coulomb potential is not *** work sheds some light on the ionization-time information of electrons from different magnetic quantum states.

关键词： strong-field ionization Wigner-distribution-like ionization instant

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Synthesis,structure,and thermal expansion in CaZrF_(6) with two polymorphs

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Nano Research 2024年第9期17卷 8618-8626页

作者： Peixian zhang Yongqiang Qiao Kaiyue Zhao Qingjie Wang Huan Zhao Juan guo Erjun Liang Tao Sun Jiangwei zhang Qilong Gao Key Laboratory of Materials physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China college of Energy Materials and Chemistry Inner Mongolia UniversityHohhot 010021China First Affiliated Hospital of Dalian Medical University 222 Zhongshan RoadDalian 116011China Ordos Laboratory Ordos 017000China

Due to the high structural flexibility and controllable thermal expansion,cubic double ReO_(3)-type negative thermal expansion(NTE)fluorides provide a solution for solving the prominent phenomenon of thermal expansion mismatch between ***,the expensive raw materials and complex synthesis steps limit its practical *** this work,we have designed a more advantageous method for the synthesis of NTE material CaZrF_(6),and it is expected to be generalized to the synthesis of other double ReO_(3)-***,a new orthorhombic phase CaZrF_(6) has been synthesized via this method in a lower *** the strong isotropic NTE of the cubic phase CaZrF_(6),the orthorhombic phase shows the strong anisotropic positive thermal expansion(PTE).The combined analysis of temperature-dependent X-ray diffraction(XRD),Raman spectra,and first-principles calculations shows that the low frequency phonon vibration mode with negative Grüneisen parameter in cubic CaZrF_(6) are strongly correlated with the transverse thermal vibration of F atoms and dominates the NTE of the material.

关键词： negative thermal expansion fluorides polymorph lattice dynamics first principles calculations

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Polaron interfacial entropy as a route to high thermoelectric performance in DAE-doped PEDOT:PSS films

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National science Review 2024年第3期11卷 259-270页

作者： Jiajia zhang Caichao Ye Genwang Wei Liang guo Yuhang Cai Zhi Li Xinzhi Wu Fangyi Sun Qikai Li Yupeng Wang Huan Li Yuchen Li Shuaihua Wang Wei Xu Xuefeng guo Wenqing zhang Weishu Liu Department of Materials science and Engineering Southern University of Science and Technology Academy for Advanced Interdisciplinary Studies and Guangdong Provincial Key Laboratory of Computational science and Material Design Southern University of Science and Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology beijing National Laboratory for Molecular sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences college of Chemistry and Molecular Engineering National Biomedical Imaging Centre Peking University Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology

Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies. However, the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly（3,4-ethylenedioxythiophene）-poly（4-styrenesulfonate）) thin film by using photochromic diarylethene（DAE） dopants coupled with UV-light modulation. With a 10-fold enhancement of the thermopower from 13.5 μV K-1to 135.4 μV K-1and almost unchanged electrical conductivity, the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28 μW m-1K-2from an original value of 6.78 μW m-1K-2. The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling. Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.

关键词： thermoelectric PEDOT: PSS interfacial occupied entropy resonant coupling UV-light modulation

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Photoelectron momentum distributions of triatomic CO_(2)molecules by circularly polarized attosecond pulses

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Chinese physics b 2024年第10期33卷 220-225页

作者： Si-Qi zhang Jun zhang Xin-Yu Hao Jing guo Aihua Liu Xue-Shen Liu Institute of Atomic and Molecular physics Jilin UniversityChangchun 130012China School of physics Harbin Institute of TechnologyHarbin 150001China

Molecular-frame photoelectron momentum distributions(MF-PMDs)have been studied for imaging molecular *** investigate the MF-PMDs of CO_(2)molecules exposed to circularly polarized(CP)attosecond laser pulses bysolving the time-dependent Schrodinger equations based on the single-active-electron approximation *** showthat high-frequency photons lead to photoelectron diffraction patterns,indicating molecular *** diffractionpatterns can be illustrated by the ultrafast photoionization ***,for the driving pulses with 30 nm,a deviationbetween MF-PMDs and theoretically predicted results of the ultrafast photoionization models is produced because theCoulomb effect strongly influences the molecular ***,the MF-PMDs rotate in the same directionas the helicity of driving laser *** results also demonstrate that the MF-PMDs in a CP laser pulse are the superpositionof those in the parallel and perpendicular linearly polarized *** simulations efficiently visualize molecularorbital geometries and structures by ultrafast photoelectron ***,we determine the contribution of HOMOand HOMO-1 orbitals to ionization by varying the relative phase and the ratio of these two orbitals.

关键词： molecular-frame photoelectron momentum distributions single-active-electron approximation frames ultrafast photoionization models

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Different effect of Li^(+),Na^(+),K^(+)-doping on crystal structure and electrical property of Sr_(0.6)ba_(0.4)Nb_(2)O_(6)

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Journal of Materiomics 2024年第5期10卷 1071-1079页

作者： Jian guo Xinrui Yang Yulong Yang Shuting Pang Shan-Tao zhang bin Yang National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences&Jiangsu Key Laboratory of Artificial Functional Materials&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210023China Nanjing University(Suzhou)High-tech Institute Suzhou Industrial Park215123China School of physics Nanjing UniversityNanjing210093China Functional Materials and Acousto-Optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China

Ferroelectric Sr_(0.6)ba_(0.4)Nb_(2)O_(6)(SbN)shows typical unfilled tetragonal tungsten bronze structure where 1/6 A sites and all C sites are *** presence of such structural vacancy provides the possibility to further modulate the crystal structure and electrical *** this work,alkali ions(Li^(+),Na^(+),K^(+))doped SbN ceramics have been fabricated via solid-solution reaction *** general,each doping promotes the crystal structure evolves from unfilled toward filled tungsten ***,the different doping ion radius causes the differences in occupying initial structural vacancies,resulting in significantly different electrical properties,Li^(+)doping enhances relaxor characteristic whereas Na+and K^(+)doping lead to normal ferroelectric behavior,accompanying an increase in Curie temperature(TC)from 36℃ of SbN to 40,212,148℃ of Li^(+),Na^(+)and K^(+)doping,*** from improved relaxor degree and high density,the Li^(+)doped SbN displays a good energy storage *** the ratio of Sr/ba and(Sr+ba)/Nb has not been changed,this work presents direct evidence for the effect of structural vacancy on crystal structure and properties,as well as inspiration for further work on unfilled tungsten bronze.

关键词： Sr_(0.6)ba_(0.4)Nb_(2)O_(6) oxides Structural vacant Alkali ions doping

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