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Ultrafast joule-heating synthesis of FeCoMnCuAl high-entropy-alloy nanoparticles as efficient OER electrocatalysts

Progress in Natural Science:Materials International 2024年第5期34卷 880-887页

作者： Xindong Zhu Wen Huang Yu Lou Zhongzheng Yao Huiqiang Ying Min Dong Lan Tan Jianrong Zeng Hua Ji He Zhu Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Institute of Applied Physics Chinese Academy of Sciences Scientific Research and Innovation Center Suzhou Nuclear Power Research Institute National Engineering Research Center for Nuclear Power Plant Safety & Reliability

High entropy alloys（HEAs）, known for their synergistic orbital interactions among multiple elements, have been recognized as promising electrocatalysts for enhancing the sluggish kinetics of oxygen evolution reaction（OER）. Despite their potential, the facile and rapid preparation of HEA nanoparticles（NPs） with high electrocatalytic activity remains challenging. Here, we report an ultrafast synthesis of noble-metal-free FeCoMnCuAl HEA NPs loaded on conductive carbon fiber networks using a Joule heating strategy. The prepared HEA NPs exhibited a face-centered cubic（FCC） structure with an average size of approximately 25 *** X-ray absorption fine structure（XAFS） and X-ray photoelectron spectroscopy（XPS） studies were performed to investigate the atomic and electronic structures of the HEA NPs, revealing the co-presence of Fe, Co, Mn, Cu and Al elements as well as their different valences across surface and internal regions. The HEA NPs showed remarkable OER performance, exhibiting an overpotential of 280 mV at 10 mA cm-2and a low Tafel slope of 76.13 mV dec-1in a 1.0 M KOH solution with high electrochemical stability, superior to commercial RuO2electrocatalysts. This work provides a new approach for synthesizing nanoscale noble-metal-free HEA electrocatalysts for clean energy conversion applications on a large-scale basis for practical commercialization.

关键词： X ray photoelectron spectroscopy

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The Λ-type P-wave bottom baryon states via the QCD sum rules

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Chinese physics C 2023年第9期47卷 73-85页

作者：辛琦王志刚吕菲 Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

Our study focuses on the Λ-type P-wave bottom baryon states with spin-parity JP=1/2−, 3/2−. We introduce an explicit P-wave between the two light quarks in the interpolating currents (these light quarks are antisymmetric in the flavor space, thus giving rise to the designation of Λ-type baryon) to investigate the Λb and Ξ_(b) states within the framework of the full QCD sum rules. The predicted masses show that Ξ_(b)(6087) and Ξ_(b)(6095/6100) could be the P-wave bottom-strange baryon states with spin-parity JP=1/2− and 3/2−, respectively;meanwhile, Λb(5912) and Λb(5920) could be the P-wave bottom baryon states with spin-parity JP=1/2− and 3/2−, respectively. Moreover, Λb(5920) and Ξ_(b)(6095/6100) may have two remarkable under-structures or Fock components at least.

关键词： bottom baryon states QCD sum rules P-wave

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Analysis of the Influence of Variation in Medical Waste Heating Value on the Electrical Energy Output of Generator in Medical Waste Cogeneration Incinerator System using Gatecycle Solver 7

Analysis of the Influence of Variation in Medical Waste Heat...

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7th Astechnova International Energy Conference, ASTECHNOVA 2023

作者： Kusnanto Harto, Andang Widi Wallitu, Hafizh Facius, Maria Josephine Afifah, Nuha Amiratul Tenggara, Ayodya Pradhipta Department of Nuclear Engineering and Engineering Physics Faculty of Engineering Universitas Gadjah Mada Jalan Grafika 2 Yogyakarta Indonesia Environmental Engineering Department Universitas Pembangunan Nasional Veteran Yogyakarta Yogyakarta Indonesia

Medical waste incinerator is a technology capable of processing and exterminating hazardous medical waste through combustion at temperatures exceeding 800°C. Medical waste exhibits a range of heating values depending on its material composition. The heating value represents the potential heat energy released when a substance undergoes complete combustion. A cogeneration incinerator is designed to treat medical waste while also harnessing the heat of the flue gas that emanates from the combustion process. The flue gas acts as a hot fluid that transfers its heat, causing the water temperature inside the boiler to increase and transform into high-temperature steam. This steam drives a steam turbine connected to a generator to generate electrical energy. The amount of electrical energy generated is influenced by the steam quality produced through the boiler's water-heating process. This study aims to investigate the influence of variation in the heating value in medical waste on the electrical energy output of the generator in a medical waste cogeneration incinerator system. The range of heating value variations used in the testing varies from 25 MJ/kg to 35 MJ/kg. The variation is tested through thorough simulations using GateCycle software to obtain data on the electrical energy generated. To achieve a maximum electrical energy output of 200 kW, fuel with a total heating value of 32.25 MJ/kg is required. This study is beneficial to be implemented as renewable energy sources based on biomass powerplant systems. © Published under licence by IOP Publishing Ltd.

关键词： Steam turbines

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Optimal detection angles for producing N=126 neutron-rich isotones in multinucleon transfer reactions

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Physical Review Research 2023年第2期5卷 L022021-L022021页

作者： Zehong Liao Long Zhu Zepeng Gao Jun Su Cheng Li Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai 519082 China College of Physics and Technology and Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal University Guilin 541004 China

The challenge of isotopic identification over a wide angular distribution has limited the measurement of neutron-rich nuclei produced via the multinucleon transfer (MNT) process. To investigate the optimal detection angles for the N=126 isotones, we propose a method to construct the reasonable scattering angles of the MNT products in the dinuclear system model (DNS-sysu). The reactions Xe136,144+Pb208 are investigated. The calculated results are in rather good agreement with the available experimental data in the reaction Xe136+Pb208. The entrance channel effects on the scattering angle are investigated. It is found that the scattering angular distribution strongly depends on the isospin and the impact parameter of the collision system. The optimal angle ranges for detecting N=126 neutron-rich nuclides Pt204, Ir203, Os202, and Re201 in the Xe136+Pb208 reaction at the incident energy Ec.m.=526MeV are predicted. Our results suggest that the angle range of 45∘⩽θlab⩽50∘ is most favorable for detecting unknown N=126 isotones. Given the current difficulties in separating and identifying experimental MNT fragments, the results of this Letter could provide significant contributions to future experiments.

关键词： Low & intermediate energy heavy-ion reactions nuclear reactions

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Investigation of 58Ni(n, p)58Co reaction cross-section with covariance analysis

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Chinese physics C 2024年第2期48卷 78-90页

作者： Akash Hingu S.Mukherjee Siddharth Parashari Arora Sangeeta A.Gandhi Mahima Upadhyay Mahesh Choudhary Sumit Bamal Namrata Singh G.Mishra Sukanya De Saurav Sood Sajin Prasad G.Saxena Ajay Kumar R.G.Thomas B.K.Agrawal K.Katovsky A.Kumar Department of Physics Faculty of ScienceThe M.S.University of BarodaVadodara 390002India Faculty of Electrical Engineering and Communication Brno University of TechnologyBrnoCzech Republic Department of Physics Faculty of ScienceUniversity of ZagrebBijenička c.32Zagreb 10000Croatia Department of Physics University Institute of SciencesChandigarh UniversityGharuanMohali 140413PunjabIndia Department of Physics Banaras Hindu UniversityVaranasi 221005India Horia Hulubei National Institute for Physics and Nuclear Engineering Măgurele 077125Romania Nuclear Physics Division Bhabha Atomic Research CentreMumbai 400085India Health Physics Division Bhabha Atomic Research CentreMumbai 400085India Department of Physics(H&S) Government Women Engineering CollegeAjmer 305002India Saha Institute of Nuclear Physics Kolkata 700064India Homi Bhabha National Institute Anushakti NagarMumbai 400094India

The excitation function of the 58Ni(n,p)58Co reaction was measured using the well-established neutron activation technique andγ-ray *** in the energy range of 1.7 to 2.7 MeV were generated using the 7Li(p,n)*** neutron flux was measured using the standard 115In(n,n’)115mIn monitor *** results of the neutron spectrum averaged cross-section of 58Ni(n,p)58Co reactions were compared with existing cross-section data available in the EXFOR data library as well as with various evaluated data libraries such as ENDF/B-VIII.0,JEFF-3.3,JENDL-4.0,and *** calculations were performed using the nuclear reaction code *** nuclear level density(NLD)models were tested,and their results were compared with the present *** NLDs were also obtained through the spectral distribution method(SDM).The cross-section results,along with the absolute errors,were obtained by investigating the uncertainty propagation and using the covariance *** forγ-ray true coincidence summing,low-energy background neutrons,andγ-ray self attenuation were *** experimental cross-section obtained in the present study is consistent with previously published experimental data,evaluated libraries,and theoretical calculations carried out using the TALYS code.

关键词： nuclear reactions (n,p)reaction cross-section measurement covariance analysis nuclear level density

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Decomposition of fissile isotope antineutrino spectra using convolutional neural network

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nuclear Science and Techniques 2023年第5期34卷 183-191页

作者： Yu-Da Zeng Jun Wang Rong Zhao Feng-Peng An Xiang Xiao Yuenkeung Hor Wei Wang School of Physics Sun Yat-sen UniversityGuangzhou510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai519082China

Recent reactor antineutrino experiments have observed that the neutrino spectrum changes with the reactor core evolution and that the individual fissile isotope antineutrino spectra can be decomposed from the evolving data,providing valuable information for the reactor model and data inconsistent *** propose a machine learning method by building a convolutional neural network based on a virtual experiment with a typical short-baseline reactor antineutrino experiment configuration:by utilizing the reactor evolution information,the major fissile isotope spectra are correctly extracted,and the uncertainties are evaluated using the Monte Carlo *** tests show that the method is unbiased and introduces tiny extra uncertainties.

关键词： Reactor antineutrino Isotope antineutrino spectrum decomposition Convolutional neural network

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Temperature-dependent synergistic evolution mechanism of rhenium and irradiation defects in tungsten-rhenium alloys

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Journal of Materials Science & Technology 2023年第14期145卷 221-234页

作者： Yu-Hao Li Fang-Ya Yue Zhong-Zhu Li Peng-Wei Hou Yu-Ze Niu Hui-Zhi Ma Ying Zhang Xun-Xiang Hu Hui-Qiu Deng Hong-Bo Zhou Fei Gao Guang-Hong Lu Department of Physics Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China College of Physics Sichuan UniversityChengdu 610065China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Nuclear Engineering and Radiological Science University of MichiganAnn ArborMI 48109USA

We have systemically investigated the synergistic evolution of rhenium(Re)and irradiation defects in tungsten(W)-Re alloys under different temperatures and irradiation doses using object Kinetic Monte Carlo *** results revealed the underlying mechanism for the transition of Re effect on W from beneficial to harmful during the Re-defects evolution with the increase of irradiation dose,in which tem-perature always plays a critical *** the one hand,Re will significantly promote the defect annihila-tion at low irradiation doses and high temperatures,thereby effectively reducing their sizes and number *** is due to the formation of stable Re-SIAs complexes that can be eliminated by the mobile vacancy-type defects,whereas the transition of the migration pattern of SIAs only plays a weak role in the defect recombination in W-Re *** the other hand,with the increase of irradiation dose,Re will aggregate to form Re-rich clusters or even ***,the formation mechanism of Re-rich clusters is also dependent on *** low temperatures,the interstitial-mediated mech-anism plays a crucial role in the Re-rich cluster formation,while at high temperatures,both SIA-type and vacancy-type defects will act as the transport carriers of Re to promote their ***,the critical conditions for the transition of Re from beneficial to harmful and the formation of Re-rich clusters at different tem peratures and irradiation doses are given with the help of the phase *** work presents the temperature dependence of the synergy of Re and irradiation defects in W-Re in fusion-relevant environment,which provides a good reference for the development of radiation-resistant materials and the prediction of W performance in fusion reactors.

关键词： Synergistic evolution Irradiation defects Defects recombination Rhenium-rich clusters Tungsten-rhenium alloys

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Fretting wear resistance of amorphous/amorphous(AlCrFeNi)N/TiN high entropy nitride nanolaminates

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Journal of Materials Science & Technology 2024年第15期182卷 41-53页

作者： Qingchun Chen Xiyu Xu An Li Quande Zhang Hengming Yang Nan Qiu Yuan Wang Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China The First Sub-institute Nuclear Power Institute of ChinaChengdu 610041China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266525China

The application of amorphous high entropy ceramics as wear-resistant materials is limited due to their inherent brittleness at room temperature and strain softening during *** order to overcome this limitation,we constructed amorphous/amorphous(AlCrFeNi)N/TiN nanolaminates with varying mod-ulation period thickness by introducing a second amorphous phase through reactive radio frequency(RF)magnetron sputtering,along with corresponding monolithic amorphous ***,mechanical properties,and tribological behaviors of the films were characterized wear in *** wear results show that the nanolaminates with an average modulation period of 6 nm exhibited a wear rate of 2.8 times lower than that of the(AlCrFeNi)N film and 8.4 times lower than that of the TiN *** anal-ysis using FIB-TEM revealed that the enhanced wear resistance of(AlCrFeNi)N/TiN nanolaminates was at-tributed to the high-density *** interfaces inhibited the initiation and propagation of mature shear bands and acted as barriers to stress ***,the oxide composite layer at the interface demonstrated a synergistic effect through a mechanically induced tribo-chemical reaction,resulting in slight plastic *** the amorphous(AlCrFeNi)N film,moderate wear resistance was achieved through the formation of transfer layer at the *** the amorphous TiN film,the dimensional stability of the film deteriorates due to the significant strain softening that occurs during *** study deepens our understanding of the friction mechanisms involved in amorphous high entropy ceramics,offering valuable insights for the design of high damage-resistant materials.

关键词： High entropy alloy Nanolaminates Magnetron sputtering Fretting wear Microstructure

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Permeable carbon fiber based thermoelectric film with exceptional EMI shielding performance and sensor capabilities

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Journal of Advanced Ceramics 2024年第8期13卷 1119-1131页

作者： Junjie Zhu Chuan Sun Wanlin Feng Mengran Chen Peng-An Zong Chunlei Wan College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211800China Nationai Innovation Institute of Defense Technology Academy of Military Sciences of the People's Liberation Army of ChinaBeijing 100089China Institute of Nuclear Physics and Chemistry Innovation Research Team for Advanced CeramicsChina Academy of Engineering PhysicsMianyang 621900China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Thermoelectric(TE)technologies offer a promising approach for directly converting skin heat into electricity for wearable *** p-type Sb2Tes and n-type BizTes as top-performing materials at room temperature,their rigid inorganic structure,with ultralow moisture permeability,poses challenges in warm and humid conditions,fostering bacterial growth and potential skin *** address this issue,we developed a cross-linked core-shell structure by electrodepositing Sb_(2)Te_(3)(Bi_(2)Te_(3))onto carbon fiber(CF).This architecture significantly improved the electrical conductivity and the Seebeck coefficient,resulting in a remarkable 300-fold increase in the power factor compared to that of pure *** CF/Sb_(2)Te_(3) and CF/Bi2Te films demonstrated optimal power factors of 450 and 121μW·m^(-1)·K^(-2),***,the fabricated films exhibited outstanding moisture permeability,over 3000 g·m^(-2)·d^(-1),exceptional electromagnetic interference shielding efficiency approaching 93 dB,and versatility as sensors for language assistance and respiratory *** attributes underline their broad applicability,emphasizing their suitability for human health protection in diverse scenarios.

关键词： thermoelectric(TE) carbon fiber(CF) Bi_(2)Te_(3) electrodeposition moisture permeability electromagnetic interference shielding

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A time-dependent luminescent phosphor of Na_(2)Ba_(2)Si_(2)O_(7):Eu for multi-level encryption and dynamic information display

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Journal of Advanced Ceramics 2024年第4期13卷 429-436页

作者： Jie Shao Xiyang Li Meng Liu Haiqin Sun Qiwei Zhang Dengfeng Peng Fuchi Liu College of Physics and Technology Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Photo-stimuli responsive materials show great potential in the fields of information encryption and storage due to their distinctive spatial or temporal color ***,the conventional single or multi-color static outputs by light stimulus difficulty meet practical requirements for high-security optical storage ***,a novel dynamic irradiation-responsive phosphor of Na_(2)Ba_(2)Si_(2)O_(7):Eu is demonstrated,exhibiting high storage stability and convenient readout *** inherent Eu^(2+)luminescence can be dynamically tuned,instantly read out,and conveniently erased by controlling irradiation duration of a portable diode laser(365 nm).The modulation mechanism is unraveled by optically induced oxidation reactions of Eu^(2+)→Eu^(3+)and defects as killer *** excellent luminescence modulation degree(ΔR_(t)=89.5%)and the accompanying larger color contrast enable the creation of invisible optical codes with multi-level encryption in bright or dark *** results indicate potential applications of Na_(2)Ba_(2)Si_(2)O_(7):-based materials in information encryption and invisible optical storage,and are expected to expand more investigations on optically induced PL modulation behaviors based on mixed valences and defects.

关键词： light irradiation luminescent modulation invisible optical storage

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