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Operando reconstruction-induced CO_(2)reduction activity and selectivity for cobalt-based photocatalysis

Nano Research 2023年第4期16卷 4812-4820页

作者： Kun Zhao Weiying Pang shuaiyu Jiang Canyu Hu Porun liu Dandan Cui Xuefei An Baojuan Tian Chao Gao Pan Zhang Meng Tian Dong Fu Huijun Zhao Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control School of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding 071003China Interdisciplinary Center for Fundamental and Frontier Sciences Nanjing University of Science and TechnologyJiangyin 214443China Centre for Catalysis and Clean Energy Griffith University Gold Coast CampusLD 4222Australia Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovative Center of Chemistry for Energy MaterialsSchool of Chemistry and Materials Scienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230026China School of Physics and BUAA-UOW Joint Research Centre Beihang UniversityBeijing 100191China

The oxygen atom coordination inducing the structure reconstruction of the catalytic site is identified and recognized ambiguously,which is related to accurately declare the mechanism in a dynamic catalytic ***,we demonstrated that the reconstructed catalytic sites would lead to a remarkable performance for photocatalytic CO_(2)*** the initial 4-cycles testing,the in-situ formation of CoOx active sites on the Co(CoP)surface performed an increasing transient activity and selectivity toward CO *** formation of reconstructive Co-O bond and the appearance of intermediate specie CO were simultaneously observed by the pre-operando Raman,revealing the dynamic relationship between catalytic site structure and the photocatalytic ***,density functional theory calculations showed that the electronic structure of the reconstructive surface sites could modulate the ability of CO_(2)adsorption and CO *** reduced barrier energy for the rate-determining step finally improved the activity and selectivity of CO_(2)reduction.

关键词： surface reconstruction unsaturated Co-Ox catalytic site balanced relationship photocatalytic CO_(2)reduction

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Ru(bpy)_(3)^(2+)-sensitized{001}facets LiCoO_(2) nanosheets catalyzed CO_(2) reduction reaction with 100% carbonaceous products

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Nano Research 2022年第2期15卷 1061-1068页

作者： shuaiyu Jiang Junxian liu Kun Zhao Dandan Cui Porun liu Huajie Yin Mohammad Al-Mamun Sean ELowe Weiping Zhang Yu Lin Zhong Jun Chen Yun Wang Dan Wang Huijun Zhao Centre for Catalysis and Clean Energy Gold Coast campusGriffith UniversityQLD 4222Australia Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science University of WollongongWollongongNSW 2500Australia Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangzhou Key Laboratory of Environmental Catalysis and Pollution ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Biochemical Engineering CAS Centre for Excellence in NanoscienceInstitute of Process EngineeringChinese Academy of ScienceBeijing 100190China

Photosensitized heterogeneous CO_(2) reduction(PHCR)has emerged as a promising means to convert CO_(2) into valuable chemicals,however,challenged by the relatively low carbonaceous product selectivity caused by the competing hydrogen evolution reaction(HER).Here,we report a PHCR system that couples Ru(bpy)32+photosensitizer with{001}faceted LiCoO_(2) nanosheets photocatalyst to simultaneously yield 21.2 and 722μmol·g^(-1)·h^(-1) of CO,and 4.42 and 108μmol·g^(-1)·h^(-1) of CH4 under the visible light and the simulated sunlight irradiations,respectively,with completely suppressed *** experimental and theoretical studies reveal that the favored CO_(2) adsorption on the exposed Li sites on{001}faceted LiCoO_(2) surface is responsible for the completely suppressed HER.

关键词： homogeneous-heterogeneous catalysis system ultrathin LiCoO_(2)nanosheets photocatalytic CO_(2)reduction suppressed hydrogen evolution reaction

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建设以研究型病房为核心的临床研究基础设施初探

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中华医学科研管理杂志 2024年第4期37卷 351-355页

作者：王帅雨聂杰陈闽江马晨曦周力刘晓清赵峻中国医学科学院北京协和医院北京100730

目的探讨临床研究基础设施的内涵与重要意义,阐述研究型病房的建设重点与运行模式,总结北京协和医院临床研究病房的经验和做法。方法通过实地调研、查阅文献,从实际出发,以案例分析的方法对比不同医疗机构研究型病房的建设模式与特色亮... 详细信息

目的探讨临床研究基础设施的内涵与重要意义,阐述研究型病房的建设重点与运行模式,总结北京协和医院临床研究病房的经验和做法。方法通过实地调研、查阅文献,从实际出发,以案例分析的方法对比不同医疗机构研究型病房的建设模式与特色亮点。结果通过借鉴国外中心的先进经验,剖析了我国临床研究基础设施面临的问题。结论作为阶段性成果,介绍北京协和医院依托转化国家重大科技基础设施建设与运行研究型病房的经验和做法。临床研究基础设施和研究型病房的建设应注重设施定位、人才队伍、资金投入、管理运行和信息系统等方面,为未来临床研究设施的建设、运行和发展提供参考。

关键词：临床研究转化医学基础设施研究型病房

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液冷充电系统及液冷电缆的研究设计

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电线电缆 2024年第3期67卷 18-21页

作者：陈帅雨取立群柯志欣刘仰航彭建华海旭强熊建兵广东南缆电缆有限公司广州510000 浙江力达电器股份有限公司广州510000 比亚迪股份有限公司深圳518000 深圳快充实业有限公司深圳518000

文中研究了液冷充电桩电缆的结构和材料选择,分析了冷却液介质、液冷充电系统及液冷充电枪的关键性能。试验对比了“水浸铜”式液冷充电桩电缆和“铜包水”式液冷充电桩电缆在不同载流量下的导体温升,并对结果进行了分析。结果表明,相... 详细信息

文中研究了液冷充电桩电缆的结构和材料选择,分析了冷却液介质、液冷充电系统及液冷充电枪的关键性能。试验对比了“水浸铜”式液冷充电桩电缆和“铜包水”式液冷充电桩电缆在不同载流量下的导体温升,并对结果进行了分析。结果表明,相同功率条件下,“水浸铜”式液冷充电桩电缆比“铜包水”式液冷充电桩电缆的温升更低,冷却效果更好。

关键词：充电桩电缆液冷系统温升液冷介质

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A strategy to improve the electrochemical performance of Ni-rich positive electrodes:Na/F-co-doped LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2)

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Chinese Physics B 2021年第7期30卷 184-191页

作者： Hui Wan Zhixiao liu Guangdong liu shuaiyu Yi Fei Gao Huiqiu Deng Dingwang Yuan Wangyu Hu College of Materials Science and Engineering Hunan UniversityChangsha 410082China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Nuclear Engineering and Radiological Sciences University of MichiganAnn ArborMI 48109USA

Ni-rich layered lithium transition metal oxides LiNi_xMn_yCo_zO_(2)(1-y-z≥0.6)are promising candidates for cathode materials,but their practical applications are hindered by high-voltage instability and fast capacity *** density functional theory calculations,we demonstrate that Na-,F-doping,and Na/F-co-doping can stabilize the structure and result into a higher open circuit voltage than pristine LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2)(NMC622)during the charging process,which may attain greater discharge capacity.F doping may inhibit the diffusion of Li ions at the beginning and end of charging;Na doping may improve Li ion diffusion due to the increase in Li layer spacing,consistent with prior ***/F-codoping into NMC622 promotes rate performance and reduces irreversible phase transitions for two reasons:(i)a synergistic effect between Na and F can effectively restrain the Ni/Li mixing and then enhances the mobility of Li ions and(ii)Ni/Li mixing hinders the Ni ions to migrate into Li layers and thus,stabilizes the *** study proposes that a layer cathode material with high electrochemical performance can be achieved via rational dopant modification,which is a promising strategy for designing efficient Li ion batteries.

关键词： Li ion batteries ion diffusion Na/F-co-doping first-principles calculations

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Spin injection into heavily-doped n-GaN via Schottky barrier

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Journal of Semiconductors 2023年第8期44卷 57-61页

作者： Zhenhao Sun Ning Tang shuaiyu Chen Fan Zhang Haoran Fan Shixiong Zhang Rongxin Wang Xi Lin Jianping liu Weikun Ge Bo Shen State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics&Collaboration Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO) Chinese Academy of SciencesSuzhou 215123China International Center for Quantum Materials Peking UniversityBeijing 100871China

Spin injection and detection in bulk GaN were investigated by performing magnetotransport measurements at low temperatures.A non-local four-terminal lateral spin valve device was fabricated with Co/GaN Schottky *** spin injection efficiency of 21%was achieved at 1.7 *** was confirmed that the thin Schottky barrier formed between the heavily ndoped GaN and Co was conducive to the direct spin tunneling,by reducing the spin scattering relaxation through the interface states.

关键词： GaN spin injection Schottky barrier magnetoresistance

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农药残留在环境中的行为过程、危害及治理措施

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农药科学与管理 2018年第2期39卷 30-34页

作者：王俊伟周春江杨建国贾峰勇张梁王帅宇刘艳珂北京市植物保护站北京100029

农药是重要的农业生产资料。不科学使用农药,会对环境、生物造成危害。本文介绍了我国农药的使用现状,论述了农药在环境中残留行为,分析了农药在环境中残留的危害,并提出了减少农药对环境危害的措施建议。

关键词：农药环境残留

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Modification of short-range repulsive interactions in ReaxFF reactive force field for Fe–Ni–Al alloy

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Chinese Physics B 2021年第8期30卷 113-119页

作者： Huaqiang Chen Lin Lang shuaiyu Yi Jinlong Du Guangdong liu Lixia liu Yufei Wang Yuehui Wang Huiqiu Deng Engang Fu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Chemistry and Biology University of Electronic Science and Technology of China Zhongshan InstituteZhongshan 528402China

The short-range repulsive interactions of any force field must be modified to be applicable for high energy atomic collisions because of extremely far from equilibrium state when used in molecular dynamics(MD)*** this work,the short-range repulsive interaction of a reactive force field(ReaxFF),describing Fe-Ni-Al alloy system,is well modified by adding a tabulated function form based on Ziegler-Biersack-Littmark(ZBL)*** modified interaction covers three ranges,including short range,smooth range,and primordial *** short range is totally predominated by ZBL *** primordial range means the interactions in this range is the as-is ReaxFF with no *** smooth range links the short-range ZBL and primordial-range ReaxFF potentials with a taper *** energies and forces are guaranteed to be continuous,and qualified to the consistent requirement in *** modified force field is applicable for simulations of energetic particle bombardments and reproducing point defects'booming and recombination effectively.

关键词： molecular dynamics force field modification Fe–Ni–Al alloy irradiation

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The role of electrolyte acid concentration in the electrochemical exfoliation of graphite:Mechanism and synthesis of electrochemical graphene oxide

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Nano Materials Science 2019年第3期1卷 215-223页

作者： Sean E.Lowe Ge Shi Yubai Zhang Jiadong Qin Lixue Jiang shuaiyu Jiang Mohammad Al-Mamun Porun liu Yu Lin Zhong Huijun Zhao Centre for Clean Environment and Energy School of Environment and Science Griffith University

Electrochemistry has emerged as a major route for graphene and graphene oxide synthesis from *** graphite oxidation is commonly used with dilute mineral acid or aqueous salt *** this system,the electrolyte acid concentration appears to be a critical ***,the effect of the acid concentration,particularly at low concentrations,is still not fully *** address this issue,we used a packed bed electrochemical reactor to synthesize seven different electrochemical graphite oxide(EGO)products in 2–16M sulfuric *** XRD,XPS,Raman,conductivity and optical microscopy analysis of the products was carried *** found dilute acid(<10 M)graphite oxides were less crystalline and less oxidized than those produced in stronger *** oxygen evolution reaction at the graphite surface appears to affect the structural changes,oxidation mechanism,and electrochemical corrosion of the *** conductivity is also strongly affected by the electrolyte’s *** show that well oxidized,yet reasonably conductive,single layer graphene oxide can be produced from 7.1M *** results broaden our understanding of graphite electrochemistry and will serve to inform future electrochemical graphene synthesis efforts.

关键词： Electrochemistry Graphene Graphene oxide Synthesis Exfoliation

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一种采用吸波透波超表面的天线RCS宽带减缩新方法

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电波科学学报 2022年第3期37卷 471-477页

作者：马于惠刘璐贾帅宇王祎昊李妍西北大学信息科学与技术学院西安710127

设计了一款具有吸波/透波双重特性的超表面,并将其用于微带天线的覆层,实现天线雷达散射截面(radar cross section,RCS)的宽带减缩.将传统的结构性吸波材料金属单元用氮化钽材料置换,提升了吸波带宽.同时,将吸波材料与频率选择表面相结... 详细信息

设计了一款具有吸波/透波双重特性的超表面,并将其用于微带天线的覆层,实现天线雷达散射截面(radar cross section,RCS)的宽带减缩.将传统的结构性吸波材料金属单元用氮化钽材料置换,提升了吸波带宽.同时,将吸波材料与频率选择表面相结合,实现了覆层对于不同来波方向的电磁波分别呈现吸波/透波两种截然不同的电磁特性.将覆层置于天线上方,当天线工作时,天线辐射的电磁波可以完美穿过覆层,因此对于天线的辐射特性不会造成影响.当雷达波照射至天线时,覆层所呈现的宽带吸波特性可最大程度降低天线的RCS.仿真结果表明:使用本文所设计的吸波/透波超表面作为天线覆层时,天线的辐射特性几乎未发生变化;而天线的单站RCS最大减缩量可达20 dB以上,减缩带宽可达5~19 GHz;同时,天线的单、双站RCS在较宽的角度范围内也得到明显的缩减.

关键词：雷达散射截面(RCS)减缩天线覆层吸波/透波超表面氮化钽

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