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Heterostructure Fe7S8/Mn(OH)2 of incomplete sulfurization induces Mn atoms with high density of states for enhancing oxygen evolution reaction and supercapacitor electrochemical performance

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Journal of Colloid and Interface science 2025年第PartA期677卷 974-982页

作者： Meng, Dexing Hong, Lumin Fang, Zhaojun Jiang, Qianqian Huang, Huabo Wu, Xiaodong Tang, Jianguo Institute of Hybrid Materials National Center of International Research for Hybrid Materials Technology National Base of International Science & Technology Cooperation College of Materials Science and Engineering Qingdao University Qingdao206000 China College of Materials Science and Engineering Nanjing Tech University Nanjing210009 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China

Heterostructures and the introduction of heterogeneous elements have been regarded as effective strategies to promote electrochemical performance. Herein, sulfur species are introduced by a simple hydrothermal vulcanization method, which constructs the open heterostructure Fe7S8/Mn(OH)2 as a bifunctional material. The open cordyceps-like morphology can make the material contact more sufficiently with the electrolyte, exposing a large number of reaction sites. Furthermore, the introduction of the heterogeneous element S successfully constructs a heterogeneous interface, the interface-modulated composite material consists of Mn atoms contributing the main density of states (DOS) near the Fermi energy level from the density functional theory (DFT) calculations, which optimizes the adsorption energy of oxygen-containing intermediates during the oxygen evolution reaction (OER) process and reduces the reaction energy barrier, being conducive to the improvement of the material's electrochemical properties. As predicted, the Fe7S8/Mn(OH)2 material exhibits remarkable electrochemical properties, such as an overpotential of 202 mV at 10 mA cm−2 for the oxygen evolution reaction and even a specific capacitance of 2198 F g−1 at 1 A g−1. This work provides new insights into the role of introducing sulfur species and controlling the structure of the material, and exemplifies novel design ideas for developing bifunctional materials for energy storage and conversion. © 2024 Elsevier Inc.

关键词： Supercapacitor

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The surface electron transfer strategy promotes the hole of PDI release and enhances emerging organic pollutant degradation

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Journal of Semiconductors 2024年第10期45卷 84-91页

作者： Yunchuan Yang Dongyu Wang Jisheng Geng Jun Liu Jun Wang State Key Laboratory of Environmental−Friendly Energy Materials School of Materials and ChemistrySouthwest University of Science and TechnologyMianyang 621010China Tianfu Institute of Research and Innovation Southwest University of Science and TechnologyChengdu 610213China Guangdong−Hong Kong Joint Laboratory for Water Security Center for Water ResearchAdvanced Institute of Natural SciencesBeijing Normal University at ZhuhaiZhuhai 519087China

In semiconductor photocatalysts,the easy recombination of photogenerated carriers seriously affects the application of photocatalytic materials in water *** solve the serious problem of electron−hole pair recombination in perylene diimide(PDI)organic semiconductors,we loaded ferric hydroxyl oxide(FeOOH)on PDI materials,successfully prepared novel FeOOH@PDI photocatalytic materials,and constructed a photo-Fenton *** system was able to achieve highly efficient degradation of BPA under visible light,with a degradation rate of 0.112 min^(−1)that was 20 times higher than the PDI system,and it also showed universal degradation performances for a variety of emerging organic pollutants and anti-interference *** mechanism research revealed that the FeOOH has the electron trapping property,which can capture the photogenerated electrons on the surface of PDI,effectively reducing the compounding rate of photogenerated carriers of PDI and accelerating the iron cycling and H2O2 activation on the surface of FeOOH at the same *** work provides new insights and methods for solving the problem of easy recombination of carriers in semiconductor photocatalysts and degrading emerging organic pollutants.

关键词： perylene diimide organic semiconductors emerging pollutants surface electron transfer strategy photo-Fenton

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IMPROVED STATISTICAL AND COMPUTATIONAL COMPLEXITY OF THE MEAN-FIELD LANGEVIN DYNAMICS UNDER STRUCTURED DATA 12

IMPROVED STATISTICAL AND COMPUTATIONAL COMPLEXITY OF THE MEA...

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12th International Conference on Learning Representations, ICLR 2024

作者： Nitanda, Atsushi Oko, Kazusato Suzuki, Taiji Wu, Denny IHPC Agency for Science Technology and Research Singapore CFAR Agency for Science Technology and Research Singapore Department of Mathematical Informatics The University of Tokyo Japan Center for Advanced Intelligence Project RIKEN Japan Center for Data Science New York University United States Center for Computational Mathematics Flatiron Institute United States

Recent works have shown that neural networks optimized by gradient-based methods can adapt to sparse or low-dimensional target functions through feature learning;an often studied target is the sparse parity function on the unit hypercube. However, such isotropic data setting does not capture the anisotropy and low intrinsic dimensionality exhibited in realistic datasets. In this work, we address this shortcoming by studying how gradient-based feature learning interacts with structured (anisotropic) input data: we consider the classification of k-sparse parity on high-dimensional orthotope where the feature coordinates have varying magnitudes, and analyze the learning complexity of the mean-field Langevin dynamics (MFLD), which describes the noisy gradient descent update on two-layer neural network. We show that the statistical complexity (i.e. sample size) and computational complexity (i.e. network width) of MFLD can both be improved when prominent directions of the anisotropic input data align with the support of the target function. Moreover, by employing a coordinate transform determined by the gradient covariance, the width can be made independent of the target degree k. Lastly, we demonstrate the benefit of feature learning by establishing a kernel lower bound on the classification error, which applies to neural networks in the lazy regime. © 2024 12th International Conference on Learning Representations, ICLR 2024. All rights reserved.

关键词： Computational complexity

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New measurement of ^(63)Cu(γ,n)^(62)Cu cross-section using quasi-monoenergeticγ-ray beam

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Nuclear science and Techniques 2025年第2期36卷 131-140页

作者： Zhi-Cai Li Zi-Rui Hao Qian-Kun Sun Yu-Long Shen Long-Xiang Liu Hang-Hua Xu Yue Zhang Pu Jiao Meng-Die Zhou Yu-Xuan Yang Sheng Jin Kai-Jie Chen Zhen-Wei Wang Shan Ye Xin-Xiang Li Chun-Wang Ma Hong-Wei Wang Gong-Tao Fan Wen Luo School of Nuclear Science and Technology University of South ChinaHengyang 421001China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Science Beijing 100049China School of Physics Henan Normal UniversityXinxiang 453007China China Institute of Atomic Energy Beijing 102413China Institute of Nuclear Science and Technology Henan Academy of SciencesZhengzhou 450046China

We present new data on the^(63)Cu(γ,n)cross-section studied using a quasi-monochromatic and energy-tunableγbeam produced at the Shanghai Laser Electron Gamma Source to resolve the long-standing discrepancy between existing measurements and evaluations of this *** an unfolding iteration method,^(63)Cu(γ,n)data were obtained with an uncertainty of less than 4%,and the inconsistencies between the available experimental data were ***γ-ray strength function of^(63)Cu(γ,n)was successfully extracted as an experimental *** further calculated the cross-section of the radiative neutron capture reaction^(62)Cu(n,γ)using the TALYS *** calculation method enables the extraction of(n,γ)cross-sections for unstable nuclides.

关键词： ^(63)Cu(γ n)reaction Cross-section data Quasi-monochromaticbeam Radiative neutron capture reaction

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Hybrid model for BOF oxygen blowing time prediction based on oxygen balance mechanism and deep neural network

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 106-117页

作者： Xin Shao Qing Liu Zicheng Xin Jiangshan Zhang Tao Zhou Shaoshuai Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Engineering Research Center of MES Technology for Iron&Steel Production Ministry of EducationBeijing 100083China Laiwu Iron and Steel Group Yinshan Section Steel Co. Ltd.Jinan 271104China

The amount of oxygen blown into the converter is one of the key parameters for the control of the converter blowing process,which directly affects the tap-to-tap time of converter. In this study, a hybrid model based on oxygen balance mechanism (OBM) and deep neural network (DNN) was established for predicting oxygen blowing time in converter. A three-step method was utilized in the hybrid model. First, the oxygen consumption volume was predicted by the OBM model and DNN model, respectively. Second, a more accurate oxygen consumption volume was obtained by integrating the OBM model and DNN model. Finally, the converter oxygen blowing time was calculated according to the oxygen consumption volume and the oxygen supply intensity of each heat. The proposed hybrid model was verified using the actual data collected from an integrated steel plant in China, and compared with multiple linear regression model, OBM model, and neural network model including extreme learning machine, back propagation neural network, and DNN. The test results indicate that the hybrid model with a network structure of 3 hidden layer layers, 32-16-8 neurons per hidden layer, and 0.1 learning rate has the best prediction accuracy and stronger generalization ability compared with other models. The predicted hit ratio of oxygen consumption volume within the error±300 m^(3)is 96.67%;determination coefficient (R^(2)) and root mean square error (RMSE) are0.6984 and 150.03 m^(3), respectively. The oxygen blow time prediction hit ratio within the error±0.6 min is 89.50%;R2and RMSE are0.9486 and 0.3592 min, respectively. As a result, the proposed model can effectively predict the oxygen consumption volume and oxygen blowing time in the converter.

关键词： basic oxygen furnace oxygen consumption oxygen blowing time oxygen balance mechanism deep neural network hybrid model

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Mössbauer study of A-site ordered spinel LiFeCr4O8

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Interactions 2024年第1期245卷 1-10页

作者： Nakamura, Shin Katsufuji, Takuro Department of Science and Engineering Teikyo University Utsunomiya320-8551 Japan Advanced Research Center of Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Faculty of Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Shinjyuku169-0051 Japan

57Fe Mössbauer spectroscopy of the A-site ordered spinel LiFeCr4O8 has been conducted in order to investigate the local structure and magnetic structure. The paramagnetic spectrum is composed of a singlet, reflecting the cubic local symmetry. Below T N ≈ 94 K, the spectrum becomes a very broad hyperfine sextet, which is interpreted as a distribution of the hyperfine field. The arrangement of the half-filled A-site Fe ions and the breathing pyrochlore Cr ions may produce a wide distribution in the magnetic interaction. Below T MS ≈ 23 K, the spectral shape abruptly changes to a well-resolved sextet, which can be fitted by one component sextet with a very small quadrupole shift. We found that the high-temperature magnetic phase (ferrimagnetic) and the low-temperature magnetic phase (conical) coexist even at 40 K. The spin-gap transition around T SG ≈ 60 K is not observed. The reported decrease in the magnetization below around 50 K may be a result of increasing magnetic anisotropy due to the appearance of the conical magnetic phase. © 2024, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Chromium compounds

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An improved simulation of temperature field in Laser–low current MAG of thin galvanized steel sheets

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International Journal of advanced Manufacturing technology 2025年第7期138卷 3441-3455页

作者： Xu, Shixiang Sun, Zhenbang Han, Yongquan Sun, Haotian Xing, Yucheng Zhang, Shiquan School of Materials Science and Engineering Inner Mongolia University of Technology Hohhot010051 China Engineering Research Center of Development and Processing Protection of Advanced Light Metals Ministry of Education Hohhot010051 China Inner Mongolia Metal Material Research Institute Baotou014034 China

This study aimed to achieve efficient and precise connection of thin steel sheets for vehicles by analyzing the thermal process of Laser-MAG hybrid high-speed welding lap of thin galvanized steel sheets. A high-speed camera combined with an NI AD data acquisition system were used, and the transition behavior and electrical signals of low-current MAG and Laser-MAG hybrid welding were examined. The thin sheet MAG welding droplet transition method mainly comprised short-circuit transfer. During the short-circuit phase, the voltage decreased and the current increased sharply, forming a short-circuit liquid column. When current increased to a certain level, the liquid bridge burst, the droplets carried heat and kinetic energy to the weld pool, the arc voltage returned to a no-load state, and the arc was re-ignited. In the arcing phase, the current first decreased steeply and then slowly, while the voltage decreased slowly and smoothly. According to the different heat source characteristics of the arc combustion and short-circuit stages during short-circuit transition, a new MAG heat source for low-current short-circuit transition was developed. This study employed a double-ellipse heat source with different powers for the arc combustion stage as well as a uniform body heat source that considered the thermal and kinetic energies of the melt droplets for the short-circuit stage. The thermal input of low current MAG welding was described by double-ellipse and uniform body heat source periodic loading. Moreover, the laser exerted an attraction and compression influence over the arc during the hybrid welding, which promoted the droplet transfer. Therefore, based on the novel MAG heat source, a hybrid Laser-MAG heat source in the short-circuit transition mode was developed. The laser beam heat source was described using a three-dimensional column heat source, the arc attraction and compression by the laser were considered indirectly through distribution parameter tuning for th

关键词： High speed cameras

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Deep ultraviolet hydrogel based on 2D cobalt-doped titanate

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Light(science & Applications) 2023年第1期12卷 68-76页

作者： Youan Xu Baofu Ding Ziyang Huang Lixin Dai Peng Liu Bing Li Wei Cai Hui-Ming Cheng Bilu Liu Xi'an Research Institute of High Technology Xi'an 710025China Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute and Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Institute of Technology for Carbon Neutrality/Faculty of Materials Science and Engineering Shenzhen Institute of Advanced TechnologyCASShenzhen 518055China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Birefringent optical elements that work in deep ultraviolet(DUV)region become increasingly important these ***,most of the DUV optical elements have fixed birefringence which is hard to be ***,we invent a birefringence-tunable optical hydrogel with mechano-birefringence effect in the DUV region,based on two-dimensional(2D)low-cobalt-doped *** 2D oxide material has an optical anisotropy factor of 1.5×10^(-11) C^(2)J^(-1) m-1,larger than maximum value obtained previously,leading to an extremely large specific magneto-optical Cotton-Mouton coefficient of 3.9×10^(6) T^(-2) *** extremely large coefficient enables the fabrication of birefringent hydrogel in a small magnetic field with an ultra-low concentration of 2D oxide *** hydrogel can stably and continuously modulate 303 nm DUV light with large phase tunability by varying the strain(compression or stretching)from 0 to 50%.Our work opens the door to design and fabricate new proof-of-concept DUV birefringence-tunable element,as demonstrated by optical hydrogels capable of DUV modulation by mechanical stimuli.

关键词： tunable ultraviolet coefficient

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Electrochemical performance of a symmetric supercapacitor device designed using laser-induced multilayered graphene

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新型炭材料(中英文) 2024年

作者： Gargi Dhiman Kavita Kumari Bon-Heun Koo Faheem Ahmed Nagih M.Shaalan Saurabh Dalela Parvez A.Alvi Ranjeet Kumar Brajpuriya Shalendra Kumar Department of Physics School of Advanced EngineeringUPES Industrial Technology Research Institute Changwon National University Changwon Department of Applied Sciences and Humanities Faculty of Engineering and Technology Jamia Millia Islamia Department of Physics College of Science King Faisal University Physics Department Faculty of Science Assiut University Department of Pure & Applied Physics University of Kota Department of Physical Science

This study demonstrates a facile and economical approach for fabricating laser-induced graphene（LIG）, which results in improved electrochemical performance. Polyimide polymer was used as a starting material for LIG synthesis and irradiated under ambient conditions using a CO2laser. The prepared LIG samples were characterized by Raman spectroscopy and FTIR, which validated the formation of multilayered graphene containing sp2 hybridized C=C bonds. The FE-SEM revealed three-dimensional sheetlike structures, while HR-TEM images displayed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the（002） plane of graphene. The electrochemical performance of the as-prepared LIG samples demonstrated a remarkable areal specific capacitance（CA） of 51 mF cm-2(170 F g-1) at 1 mA cm-2(3.3 A g-1) in a three-electrode configuration with 1M KOH as the aqueous electrolyte. The LIG electrodes produced an energy density of ～3.5 μWh cm-2and a power density of ～350 μW cm-2,demonstrating significant energy storage capabilities. Additionally, the electrodes exhibited excellent cyclic stability, retaining 87%of their specific capacitance after 3 000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with LIG electrodes and the tested 1M KOH electrolyte showed a specific capacitance of 23 mF cm-2and maintained excellent retention after 10,000 cycles,showing LIG's potential for supercapacitor applications.

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Nucleoside deaminases: the key players in base editing toolkit

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Biophysics Reports 2023年第6期9卷 325-337页

作者： Jiangchao Xiang Wenchao Xu Jing Wu Yaxin Luo Bei Yang Jia Chen Gene Editing Center School of Life Science and Technology Shanghai Tech University Shanghai Institute for Advanced Immunochemical Studies Shanghai Tech University Shanghai Clinical Research and Trial Center

The development of nucleoside deaminase-containing base editors realized targeted single base change with high efficiency and precision. Such nucleoside deaminases include adenosine and cytidine deaminases, which can catalyze adenosine-to-inosine(A-to-I) and cytidine-to-uridine(C-to-U) conversion respectively. These nucleoside deaminases are under the spotlight because of their vast application potential in gene editing. Recent advances in the engineering of current nucleoside deaminases and the discovery of new nucleoside deaminases greatly broaden the application scope and improve the editing specificity of base editors. In this review, we cover current knowledge about the deaminases used in base editors, including their key structural features, working mechanisms, optimization, and evolution.

关键词： Nucleoside deaminase Base editors

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