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Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

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Plasma Science and Technology 2024年第8期26卷 25-31页

作者： Naoko ASHIKAWA Robert LUNSFORD Federico NESPOLI Erik GILSON Yaowei YU Jiansheng HU Shinichiro KADO National institute.for Fusion Science Toki 509-5292Japan Princeton Plasma Physics Laboratory Princeton NJ 08540United States of America institute.of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China institute.of Advanced energy Kyoto UniversityKyoto 611-0011Japan

In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow *** 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning *** the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron *** operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to *** results suggest a reduction in hydrogen at the top surface by *** oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also *** the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.

关键词： boron layer oxygen impurity hydrogen recycling impurity powder dropper LHD EAST

Advancing sustainability:Magnesium-based solutions for environmental challenges and high-performance technologies in superconductivity

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Journal of Magnesium and Alloys 2024年第4期12卷 1257-1259页

作者： Muralidhar Miryala Materials for energy and Environmental Laboratory Shibaura Institute of Technology3-7-5 ToyosuKoto-KuTokyo 135-8548Japan

The Journal of Magnesium and Alloys(JMA)is actively dedicated to addressing crucial issues related to energy con-servation,emission reduction,energy crises,and sustainable development[1].Magnesium,recognized as the lightest com-mercial structural metal and a promising energy storage ma-terial,holds immense potential in contributing to strategic objectives such as achieving“carbon neutrality”and the“emission peak”,thus mitigating the ongoing energy cri-sis[2].JMA diligently reports on various research fronts,including magnesium-based structural materials,magnesium batteries,magnesium-based hydrogen storage materials,and magnesium-based superconducting super magnets[3].

关键词： magnesium holds structural

Recension of boron nitride phase diagram based on high-pressure and high-temperature experiments

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Chinese Physics B 2024年第10期33卷 450-457页

作者： Ruike Zhang Ruiang Guo Qian Li Shuaiqi Li Haidong Long Duanwei He institute.of atomic and Molecular Physics Sichuan UniversityChengdu 610065China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Key Laboratory of High energy Density Physics and Technology of Ministry of Education Sichuan UniversityChengdu 610065China

Cubic boron nitride and hexagonal boron nitride are the two predominant crystalline structures of boron *** can interconvert under varying pressure and temperature ***,this transformation requires overcoming significant potential barriers in dynamics,which poses great difficulty in determining the c-BN/h-BN phase *** study used high-pressure in situ differential thermal measurements to ascertain the temperature of h-BN/c-BN conversion within the commonly used pressure range(3-6 GPa)for the industrial synthesis of c-BN to constrain the P-T phase boundary of h-BN/c-BN in the pressure-temperature range as much as *** on the analysis of the experimental data,it is determined that the relationship between pressure and temperature conforms to the following equation:P=a+1/***,P denotes the pressure(GPa)and T is the temperature(K).The coefficients are a=-3.8±0.8 GPa and b=229.8±17.1 GPa/*** findings call into question existing high-pressure and high-temperature phase diagrams of boron nitride,which seem to overstate the phase boundary temperature between c-BN and *** BN phase diagram obtained from this study can provide critical temperature and pressure condition guidance for the industrial synthesis of c-BN,thus optimizing synthesis efficiency and product performance.

关键词： hexagonal boron nitride phase diagram high temperature and high pressure cubic boron nitride phase transition differential thermal analysis

Low-energy inelastic electron scattering from carbon monoxide:Excitation and de-excitation of the X^(1)Σ^(+),a^(3)Π,a'^(3)∑^(+),A^(1)Π,d^(3)Δ,e^(3)∑^(-),I^(1)∑^(-)and D^(1)Δelectronic states

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Chinese Physics B 2024年第4期33卷 444-450页

作者：卫鹏宇黄朝文程新路张红 institute.of atomic and Molecular Physics Sichuan UniversityChengdu 610065China College of Physics Sichuan UniversityChengdu 610065China

Cross-sections for electronic excitation and de-excitation among the ground state and lowest-lying seven electronic excited states of carbon monoxide(CO)by low-energy electron impact are computed using the R-matrix *** excitation cross-sections from the ground state to the electronic states a^(3)Π,a'^(3)Σ^(+)+and A^(1)Πagree with previous experimental and theoretical *** addition,the cross-sections for the I^(1)Σ^(+)-and D^(1)Δstates of CO,which will cascade to CO a'^(3)Σ^(+)+and A^(1)Πstates,are ***,in contrast to the typical increase in electronic excitation cross-sections with collision energy,the de-excitation cross-sections show a negative trend with increasing energy.

关键词： electron-CO collision electronic excitation cross-sections R-matrix method

Insight into demand-driven preparation of single-atomic mediators for lithium–sulfur batteries

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Journal of energy Chemistry 2024年第3期90卷 205-219,I0007页

作者： Miaoyu Lu Yifan Ding Zaikun Xue Ziang Chen Yuhan Zou Jingyu Sun College of energy Soochow Institute for Energy and Materials InnovationsKey Laboratory for Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina Beijing Graphene institute Beijing 100095China

Lithium-sulfur(Li-S) batteries have attracted considerable attention as one of the most appealing energy storage *** efforts have been devoted to tackling the tremendous challenges,mainly pertaining to the severe shuttle effect,sluggish redox kinetics and lithium dendritic ***-atomic mediators as promising candidates exhibit impressive performance in addressing these intractable *** research often utilizes a trial-and-error approach,proposing solutions to fabricate single-atomic materials with diversified ***,comprehensive review articles especially targeting demand-driven preparation are still in a nascent *** by these considerations,this review summarizes the design of single-atomic mediators based on the application case-studies in LiS batteries and other metal-sulfur *** preparation routes represented by chemical vapor deposition technology are introduced in a demand-oriented ***,future research directions are proposed to foster the advancement of single-atomic mediators in Li-S realm.

关键词： Single-atom catalyst Lithium–sulfur battery Chemical vapor deposition Demand-driven preparation

Special issue on electrochemical conversion and utilization of hydrogen energy

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Frontiers in energy 2024年第3期18卷 263-264页

作者： Yun ZHENG Bo YU Xiaogang FU Jiujun ZHANG institute.of New energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China State Key Laboratory of Solidification Processing Atomic Control&Catalysis Engineering LaboratorySchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China institute.of Nuclear and New energy Technology Tsinghua UniversityBeijing 100084China

The concerns over energy crisis and climate change caused by the excessive consumption of fossil fuels and the associated emission of greenhouse gases, have driven many countries to develop policies for an energy transition into zero-carbon energy sources, essentially aiming at decarbonizing their energy systems. Among various renewable sources, hydrogen has been hailed as an ideal alternative to provide secure, cost-effective, and non-polluting energy. In recent years, there has been noteworthy progress in hydrogen electrochemical conversion and utilization techniques and devices, including water electrolyzers, proton-exchange membrane fuel cells (PEMFCs), solid oxide fuel cells (SOFCs), etc. Each of these technologies has yielded a series of encouraging advances. To showcase these recent advances, Frontiers in energy is launching a special issue titled “electrochemical conversion and utilization of hydrogen energy”.

关键词： hydrogen energy. electrochemical

Systematic investigation of nucleon optical model potentials in(p,d)transfer reactions

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Chinese Physics C 2024年第7期48卷 168-175页

作者：陈思璐刘子旋张智续瑞瑞庞丹阳许祎萍 School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China China Nuclear Data Center China Institute of Atomic EnergyBeijing 102413China School of Physics Beihang UniversityBeijing 100191China

The consistent three-body model reaction methodology(TBMRM)proposed by *** et al.[***.C 69,064313(2004);***.C 73,044608(2006);***.C 75,064320(2007)],which includes adopting the simple zero-range adiabatic wave approximation,constraining the single-particle potentials using modern Hartree-Fock calculations,and using global nucleon optical model potential(OMP)geometries,are widely applied in systematic studies of transfer *** this study,we investigate the influence of different nucleon OMPs in extracting spectroscopic factors(SFs)from(p,d)*** study covers 32 sets of angular distribution data of(p,d)reactions on four targets and a large range of incident energies(20-200 MeV/nucleon).This study uses two semi-microscopic nucleon OMPs,i.e.,Jeukenne,Lejeune,and Mahaux(JLM)[***.C 16,80(1977);***.C 58,1118(1998)]and CTOM[***.C 94,034606(2016)],and a pure microscopic nucleon potential,i.e.,WLH[***.127,182502(2021)].The results are compared with those using the phenomenological global optical potential KD02[***.A 713,231(2003)].We find that the incident energy dependence of spectroscopic factors extracted from(p,d)reactions is evidently suppressed when microscopic OMPs are employed for ^(12)C,^(28)Si,and *** addition,spectroscopic factors extracted using the systematic microscopic optical potential CTOM based on the Dirac-Brueckner-Hartree-Fock theory are more in line with the results obtained from(e,e′p)measurements,except for 16O and ^(40)Ca at high energies(>100 MeV),necessitating an exact treatment of double-magic *** results obtained by using the pure microscopic optical potential,WLH,based on the EFT theory show the same trend as those of CTOM but are generally *** JLM potential,which relies on simplified nuclear matter calculations with old-fashioned bare interactions,produces results that are very similar to those of the phenomenological potential *** results indicate that modern

关键词： optical model potentials transfer reactions spectroscopic factors

Electronegativity-assisted optimized electronic structure of functionalized-Pt catalysts for boosting oxygen reduction kinetics

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Rare Metals 2024年第5期43卷 1965-1976页

作者： Jin Long Kai-Wen Zhuang Wei Liao Yan An Bin Wang Chen-Zhong Wu Jian-Xin Cao Qing Wang Jun-Song Chen Qing-Mei Wang Guizhou University Key Laboratory of Green Chemical and Clean energy Technology School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China Guizhou University Engineering research Center of Effcient Utilization for Industrial Waste Guizhou UniversityGuiyang 550025China institute.of Dual-Carbon and New energy Technology Innovation and Development of Guizhou Province Guiyang 550025China Department of Dermatology West China HospitalSichuan UniversityChengdu610041China institute.for Catalysis Hokkaido UniversitySapporo 001-0021Japan School of Materials and energy University of Electronic Science and Technology of ChinaChengdu 611731China Interdisciplinary Materials research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China

Opportunity to harmonize aspects of oxygen reduction reaction(ORR)performance and structure,and morphology,as well as composition,is urgent for the commercialization of proton exchange membrane fuel ***,we demonstrate the design and synthesis of a functionalized-supported-Pt catalyst(Pt@HNC)featuring a hollow nitrogen-modified dodecahedral carbon substrate obtained by a stress-induced-shrink tailoring *** as-obtained Pt@HNC catalyst possesses enhanced ORR per-formance,in particular with half-wave potential,mass activity(MA)and specific activity,which greatly exceed the commercial Pt/*** density functional theory(DFT)calculations further confirmed that the charge redistribution induced by the electronegativity differences improved the electron interaction between Pt and HNC *** optimized electronic structure of Pt weakens the reaction energy barrier on the Pt@HNC surface and adsorption of^(*)OH species,thus cooperatively improving the intrinsic activity toward ***,our work indeed provides a guide for the future design of functional nanomaterials in the field of catalysts and clean energy.

关键词： Proton exchange membrane fuel cell(PEMFC) Oxygen reduction catalysis Supported Pt-based catalyst Stability

Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse

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Chinese Physics B 2024年第3期33卷 433-440页

作者：王源李玉龙乔月高娜郭福明陈洲赫兰海杨玉军赵曦王俊 institute.of atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China Beijing institute.of Space Launch Technology Beijing 100076China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710062China

We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping *** findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping *** phenomenon holds potential significance for experimental setups necessitating precisely tuned single ***,we observe a modulated shift in the created harmonic photon energy,spanning an impressive range of 1.2 *** frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse,directly influencing the position of the peak frequency *** study quantifies the dependence of this tuning range and the asymmetry of the laser pulse,offering valuable insights into the underlying mechanisms driving this ***,our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is *** attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return *** observation introduces an innovative approach for generating semi-integer order harmonics,thus expanding our understanding of high-order harmonic ***,our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications,particularly those involving precise spectral control and the generation of unique harmonic patterns.

关键词： high-order harmonic semi-integer-order spectra shift inhomogeneous field