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Electrochemical hydrogen-storage capacity of graphene can achieve a carbon-hydrogen atomic ratio of 1:1

Science china Chemistry 2022年第2期65卷 318-321页

作者： Quanfeng He Lanping Zeng Lianhuan Han Juan Peng matthew M.Sartin yuan-Zhi Tan Dongping Zhan Zhong-Qun tian State Key Laboratory of Physical Chemistry of Solid Surfaces Fujian Science&Technology Innovation Laboratory for Energy Materials of ChinaEngineering Research Center of Electrochemical Technologies of Ministry of EducationGraphene Industry and Engineering Research InstituteDepartment of ChemistryCollege of Chemistry and Chemical EngineeringDepartment of Mechanical and Electrical EngineeringSchool of Aerospace EngineeringXiamen UniversityXiamen 361005China Department of Chemistry College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

As a promising hydrogen-storage material,graphene is expected to have a theoretical capacity of 7.7 wt%,which means a carbon-hydrogen atomic ratio of 1:***,it has not been demonstrated yet by experiment,and the aim of the *** of energy is to achieve 5.5 wt%in *** designed a spatially-confined electrochemical system and found that the storage capacity of hydrogen adatoms on single layer graphene(SLG)is as high as 7.3.wt%,which indicates a carbon-hydrogen atomic ratio of 1:1 by considering the sp^(3. defects of ***,SLG was deposited on a large-area polycrystalline platinum(Pt)foil by chemical vapor deposition(CVD);then,a micropipette with reference electrode,counter electrode and electrolyte solution inside was impacted on the SLG/Pt foil(the working electrode)to construct the spatially-confined electrochemical *** SLG-uncovered Pt atoms act as the catalytic sites to convert protons(H^(+))to hydrogen adatoms(H_(ad)),which then spill over and are chemically adsorbed on SLG through surface diffusion during the cathodic *** the electrode processes are reversible,the H_(ad) amount can be measured by the anodic stripping *** is the first experimental evidence for the theoretically expected hydrogen-storage capacity on graphene at ambient environment,especially by using H+rather than hydrogen gas(H_(2))as the hydrogen source,which is of significance for the practical utilization of hydrogen energy.

关键词： graphene hydrogen storage surface electrochemistry adsorption desorption spillover surface diffusion

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Fine structure ofαdecay in^(222)Pa

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Chinese Physics C 2021年第4期45卷 192-197页

作者： Wei Hua Zhiyuan Zhang Long ma Zaiguo Gan Huabin Yang Cenxi yuan Minghui Huang Chunli Yang Mingming Zhang Yulin {3. Xiaohong Zhou Sino-French institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBejing 100049China

With the help of the gas-filled recoil spectrometer SHANS and a digital data acquisition system,the fine structure of the α decay for^(222)Pa was *** nuclides were produced through the 1p3. evaporation channel via the heavy-ion induced fusion evaporation reaction ^(40)Ar+^(186)*** on the ER-α1-α2-α3.andα-γcorrelation measurement,three new α decays were observed in addition to the three branches known *** one with the largestαdecay energy was regarded as the ground state to ground state *** newly measuredαdecay properties of ^(222)Pa were examined in a framework of reduced width.

关键词： fusion-evaporation reaction αdecay fine structure Q_(α)reduced width

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Deep Penetration of Charged Particles in Biological Samples

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Chinese Physics Letters 2001年第2期18卷 208-210页

作者： WANG Rui-Jin XIA Yue-yuan MU Yu-Guang ZHAO Ming-Wen ma Yu-Chen LIU Xiang-Dong ZHANG Jian-HuaLIU Ji-tian YU Zeng-Liang Department of Optoelectronics and Information Engineering Shandong UniversityJi’nan 250100 Department of Physics Shandong UniversityJi’nan 250100 institute of Plasma Physics Chinese Academy of SciencesHefei ***

Experimental evidence of abnormally deep penetration in some botanical targets by low-energy ion beams is *** energy spectra of 818 keV He^(+)ions penetrating a 70μm thick seed coat of maize,fruit peel of grape and of tomato all have a common *** leading edges of these broad spectra indicate that some of the penetrating ions pass through the thick targets easily and only lose a small fraction of their initial incident *** backscattering spectrometry and electron microprobe measurements are used to determine the argon concentration in multilayer samples of the seed coat of maize implanted by 200 keV Ar^(+)*** results show that about 10%of the Ar^(+)ions can penetrate deeper than~100μm in these samples.

关键词： microprobe multilayer incident

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Graphene plasmonic nanoresonators/graphene heterostructures for efficient room-temperature infrared photodetection

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半导体学报：英文版 2020年第7期41卷 54-60页

作者： tian Sun Weiliang ma Donghua Liu Xiaozhi Bao Babar Shabbir Jian yuan Shaojuan Li Dacheng Wei Qiaoliang Bao Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering(IAPME)University of MacaoMacaoChina School of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Department of materials Science and Engineering and ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET)Monash UniversityClaytonVictoria 3800Australia

High-performance infrared(IR)photodetectors made by low dimensional materials promise a wide range of applications in communication,security and ***,light-harvesting effects based on novel plasmonic materials and their combinations with two-dimensional(2 D)materials have raised tremendous interest in recent years,as they may potentially help the device complement or surpass currently commercialized IR *** is a particularly attractive plasmonic material because graphene plasmons are electrically tunable with a high degree of electromagnetic confinement in the mid-infrared(mid-IR)to terahertz regime and the field concentration can be further enhanced by forming ***,we report an efficient mid-IR room-temperature photodetector enhanced by plasmonic effect in graphene nanoresonators(GNRs)/graphene *** plasmon polaritons in GNRs are size-dependent with strong field *** that the size and density of GNRs are controllable by chemical vapor deposition method,our work opens a cost-effective and scalable pathway to fabricate efficient IR optoelectronic devices with wavelength tunability.

关键词： graphene plasmons nanoresonators s-SNOM mid-infrared photodetectors

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Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang Yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang Li Gong Li Dong Liu Zheng-Yao Jin Xing-Zhu Cui tian-Xiang Chen Yi-Wei Yang Rong Liu Han Yi Yang Li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai Jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-Qing Feng Fan-Zhen Feng Ke-Qing Gao Min-Hao Gu Chang-Cai Han Zi-Jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Wei-Hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang Ling Kang Bo Li Chao Li Jia-Wen Li Xiao Li Jie Liu Shu-Bin Liu Guang-yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang Sun Zhi-Xin Tan Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Mo-Han Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang Yue Zhang Zhi-Yong Zhang mao-yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu Sino-French institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China institute of High-energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the china Spallation Neutron Source(CSNS)that provides neutrons in the eV to 3.0 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

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Surface active-site engineering in hierarchical PtNi nanocatalysts for efficient triiodide reduction reaction

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Nano Research 2021年第12期14卷 4714-4718页

作者： Jiabin Cui Pin ma Weidan Li Rui Jiang Lirong Zheng yuan Lin Chang Guo Xiong Yin Leyu Wang State Key Laboratory of Chemical Resource Engineering Innovation Centre for Soft Matter Science and EngineeringCollege of ChemistryBeijing University of Chemical TechnologyBeijing100029China Beijing National Laboratory for Molecular Sciences Key Laboratory of PhotochemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Pillar of Engineering Product Development Singapore University of Technology and DesignSingapore487372Singapore

Hierarchical Pt-alloys enriched with active sites are highly desirable for efficient catalysis,but their syntheses generally need time-consuming and elaborate annealing treatment at high *** herein report a surface active-site engineering strategy for constructing the hierarchical PtNi nanocatalysts with an atomic Pt-skin layer(PtNi@Pt-SL)towards efficient triiodide reduction reaction(TRR)via an acid-dealloying *** facile acid-dealloying process promotes the formation of surface Pt active sites on the hierarchical Pt-alloys,and thus results in good catalytic performance towards *** calculation reveals that the enhanced catalytic property stems from the moderate {3. barriers for iodide atoms on the surface Pt *** surface active-site engineering strategy paves a new way for the design of active and durable electrocatalysts.

关键词： surface active-site engineering Pt skin-layer hierarchical structure dealloying triiodide reduction reaction

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Hypothermia selectively protects the anterior forebrain mesocircuit during global cerebral ischemia

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Neural Regeneration Research 2022年第7期17卷 1512-1517页

作者： Xiao-Hua Wang Wei Jiang Si-yuan Zhang Bin-Bin Nie Yi Zheng Feng Yan Jian-Feng Lei tian-Long Wang Department of Anesthesiology Xuanwu HospitalCapital Medical UniversityBeijingChina National Clinical Research Center for Geriatric Disorders BeijingChina Department of Anesthesiology Third Medical Center of People’s Liberation Army General HospitalBeijingChina Daxing Hospital Affiliated to Capital Medical University BeijingChina Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijingChina Neuroprotection Research Laboratory Departments of Radiology and NeurologyMassachusetts General Hospital and Harvard Medical SchoolCharlestownMAUSA Cerebrovascular Research Center Xuanwu HospitalCapital Medical UniversityBeijingChina

Hypothermia is an important protective strategy against global cerebral ischemia following cardiac ***,the mechanisms of hypothermia underlying the changes in different regions and connections of the brain have not been fully *** study aims to identify the metabolic nodes and connection integrity of specific brain regions in rats with global cerebral ischemia that are most affected by hypothermia treatment.18F-fluorodeoxyglucose positron emission tomography was used to quantitatively determine glucose metabolism in different brain regions in a rat model of global cerebral ischemia established at 3.–3.℃.Diffusion tensor imaging was also used to reconstruct and explore the brain connections *** results showed that,compared with the model rats established at 3.–3..5℃,the rat models of global cerebral ischemia established at 3.–3.℃had smaller hypometabolic regions in the thalamus and primary sensory areas and sustained no obvious thalamic *** selectively preserved the integrity of the anterior forebrain mesocircuit,exhibiting protective effects on the brain during the global cerebral *** study was approved by the Institutional Animal Care and Use Committee at Capital Medical University(approval ***-AD3.8-97-019)on December 15,2019.

关键词： anterior forebrain mesocircuit cardiac arrest corpus callosum global cerebral ischemia hypometabolic areas hypothermia magnetic resonance imaging positron emission tomography prefrontal cortex rats thalamus

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Hydrocarbon generation mechanism of lamalginite- and telalginite-dominated source rocks in a saline lake basin: A case study of the Permian Lucaogou formation in the Jimusaer Sag, Junggar Basin

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能源地球科学(英文) 2023年第3期4卷 220-232页

作者： Lichang Chen Jingqiang Tan Haisu Cui Xiao ma Xueqi Song Qiang yuan Jin Liu Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of EducationChangsha410083China School of Civil Engineering(Central South University) Changsha410083China Research institute of Experiment and Testing PetroChina Xinjiang Oilfield CompanyKaramay834000China

The hydrocarbon generation of source rocks is significantly influenced by organic matter type, chemical element composition, and structural characteristics of kerogen. We classified the organic matter types in the shale of the Lucaogou Formation, Jimusar Sag, Junggar Basin, using organic petrology and rock pyrolysis as well as kerogen element and Fourier transform infrared (FT-IR) spectroscopy analyses, and compared the hydrocarbon generation mechanisms of source rocks with different types of organic matter. The organic matter of the Lucaogou Formation contains mostly two types of hydrocarbon generating macerals, the lamalginite and the telalginite based on physical and optical properties (texture, fluorescence, and optical reflectance). The lamalginite is a continuous sheet of less than 5 μm thick and greater than 50 μm in length. It has strong yellow fluorescence. The telalginite occurs as discontinuous short strips or pear-shaped objects with length of 10–3. μm and relatively weak fluorescence. The lamalginite-dominated shale has higher atomic H/C and lower atomic O/C ratios, indicating better hydrocarbon generation potential, whereas the telalginite-dominated shale has higher N and S heteroatom contents. The results of FT-IR spectroscopy of the kerogen indicate that the lamalginite-dominated shale is rich in aliphatic groups with long linear methylene sequences. The aromatic groups content is relatively low, but the carboxyl/carbon group (Cdouble bondO) content is high. The aliphatic group content of the telalginite-dominated shale is relatively low, with short-branched chains. The aromatic group content is relatively high. The methyl vibration signal directly connected to the benzene ring is strong, and the sulfoxide (Sdouble bondO) group has a high-intensity peak. Our results provide new insights into distinguishing organic matter types in the Lucaogou Formation and understanding the hydrocarbon generation mechanisms of source rocks in saline lake basins.

关键词： Luca ogou formnation Larnalginite Telalginite Kerogen Fourier transformn infared spectroscopy

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我国高放废物地质处置新突破

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原子能科学技术 2024年第S02期58卷 217-230页

作者：王驹陈亮周志超赵星光田霄季瑞利马洪素曹胜飞凌辉康明亮国家原子能机构高放废物地质处置创新中心北京100029 核工业北京地质研究院北京100029 中山大学中法核工程与技术学院广东珠海519082

2019年5月6日,国家原子能机构批复了我国高放废物地质处置地下实验室建设工程立项建议书。2021年6月17日,地下实验室工程正式开工建设,标志着我国高放废物地质处置进入一个新的阶段——地下实验室阶段,实现了新的突破。本文介绍近五年(2... 详细信息

2019年5月6日,国家原子能机构批复了我国高放废物地质处置地下实验室建设工程立项建议书。2021年6月17日,地下实验室工程正式开工建设,标志着我国高放废物地质处置进入一个新的阶段——地下实验室阶段,实现了新的突破。本文介绍近五年(2019-2024)来我国高放废物地质处置在法律法规、技术标准、场址评价、缓冲材料、工程技术、岩石力学、放射性核素迁移和安全评价等方面取得的新进展,重点介绍北山地下实验室工程建设及研究开发的新进展。

关键词：中国高放废物地质处置北山地下实验室场址评价

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Fe/Co/Ni-N共掺杂石墨烯氧还原反应活性的DFT研究

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原子与分子物理学报 2024年第3期41卷 85-90页

作者：马俊杰宁锴王婷刘建峰袁斌霞潘卫国施正荣上海电力大学能源与机械工程学院上海200090 上海非碳基能源转换与利用研究院上海200240

为了研究Fe/Co/Ni-N掺杂石墨烯的氧还原反应(ORR)活性,比较单金属原子和氮不同的掺杂方式对石墨烯ORR活性的影响.利用materials Studio软件建立了Fe/Co/Ni-N掺杂石墨烯模型,然后将氧气分子分别吸附在Fe/Co/Ni-N掺杂石墨烯模型表面上.采... 详细信息

为了研究Fe/Co/Ni-N掺杂石墨烯的氧还原反应(ORR)活性,比较单金属原子和氮不同的掺杂方式对石墨烯ORR活性的影响.利用materials Studio软件建立了Fe/Co/Ni-N掺杂石墨烯模型,然后将氧气分子分别吸附在Fe/Co/Ni-N掺杂石墨烯模型表面上.采用CASTEP模块对构建的模型进行结构优化并模拟计算,分析了Fe/Co/Ni-N掺杂石墨烯的吸附能、脱附能和导电性变化规律.基于模拟计算,发现单金属原子掺杂石墨烯时,Fe掺杂石墨烯的ORR活性优于Co和Ni;单金属原子和氮共掺杂石墨烯时,Fe-N掺杂石墨烯的ORR活性高于Co-N和Ni-N掺杂石墨烯,且M-N4-G形态的ORR活性优于M-N1-G、M-N2-G和M-N3.G.

关键词：单金属原子氮掺杂石墨烯氧还原反应 DFT模拟

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