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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO_(2)

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu Xiaoling Liu Biao Meng Tao Chen yu han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina Advanced Membranes and Porous Materials Center Physical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)Jurong IslandSingapore 627833Singapore College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina

The synergy of single atoms(SAs)and nanoparticles(NPs)has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR);however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly(ionic liquids)(PIL)precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO_(2)into *** Ni K-edge X-ray absorption near-edge structure(XANES)spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO_(2),the coexistence of Ni SAs and NPs strengthened the CO_(2)activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO_(2)→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect cO2 reduction Carbon catalyst Electrocatalysis

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Reversible Li plating regulation on graphite anode through a barium sulfate nanofibers-based dielectric separator for fast charging and high-safety lithium-ion battery

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Journal of Energy Chemistry 2025年第2期101卷 511-523页

作者： Yaxin Zhang Long Cheng Ying-Jie Zhu Jin Wu han-Ping yu Sida Xie Dandan Li Zhaohui Wang Heng Li State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences College of Materials Science and Engineering Hunan University Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Poor Li plating reversibility and high thermal runaway risks are key challenges for fast charging lithiumion batteries with graphite ***,a dielectric and fire-resistant separator based on hybrid nanofibers of barium sulfate（BS） and bacterial cellulose（BC） is developed to synchronously enhance the battery's fast charging and thermal-safety *** regulation mechanism of the dielectric BS/BC separator in enhancing the Li+ion transport and Li plating reversibility is revealed.（1） The Max-Wagner polarization electric field of the dielectric BS/BC separator can accelerate the desolvation of solvated Li+ions,enhancing their transport kinetics.（2） Moreover,due to the charge balancing effect,the dielectric BS/BC separator homogenizes the electric field/Li+ion flux at the graphite anode-separator interface,facilitating uniform Li plating and suppressing Li dendrite ***,the fast-charge graphite anode with the BS/BC separator shows higher Coulombic efficiency（99.0% vs.96.9%） and longer cycling lifespan（100 cycles vs.59 cycles） than that with the polypropylene（PP） separator in the constantlithiation cycling test at 2 mA *** high-loading LiFePO4(15.5 mg cm-2)//graphite(7.5 mg cm-2) full cell with the BS/BC separator exhibits excellent fast charging performance,retaining 70% of its capacity after 500 cycles at a high rate of 2C,which is significantly better than that of the cell with the PP separator（retaining only 27% of its capacity after 500 cycles）.More importantly,the thermally stable BS/BC separator effectively elevates the critical temperature and reduces the heat release rate during thermal runaway,thereby significantly enhancing the battery's safety.

关键词： Fast charging Graphite anode Ion transport Lithium-ion battery Separator

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Analytical Channel Modeling: From MIMO to Extra Large-Scale MIMO

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Chinese Journal of Electronics 2025年第01期34卷 1-15页

作者： Jiachen Tian yu han Shi Jin Jun Zhang Jue Wang National Mobile Communication Research Laboratory Southeast University Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications School of Information Science and Technology Nantong University

Multiple antenna technologies, from traditional multiple-input multiple-output(MIMO) to massive MIMO and the emerging extra large-scale MIMO, have consistently played a pivotal role in enhancing transmission rates by increasing the number of antennas. To guide the design of transmission strategies, channel models, especially analytical ones, are always significant tools, which can also reveal the performance improvements brought about by multiple antenna technologies. Analytical channel models have enjoyed significant success in traditional MIMO and massive MIMO systems. Nevertheless, due to the extended size of the array in an extra large-scale MIMO system, the distance between the receiver and the transmitter decreases and new channel properties, which did not manifest in massive MIMO systems, begin to kick in. To model the channel tailored for extra large-scale MIMO systems analytically, it is crucial to conduct a comprehensive review of traditional analytical MIMO channel models, which serves as a foundational step in understanding the fundamental characteristics of multi-antenna channels. In this paper, we first provide a survey on the state-of-the-art analytical MIMO channel models from the perspective of spatial correlation and signal propagation. Subsequently, we summarize the new properties of extra large-scale MIMO systems, i.e.,near-field properties and spatial non-stationarities, and their influences on analytical channel modeling. Our objective is to elucidate how these novel properties affect the analytical MIMO channel models, and ultimately facilitate the development of precise analytical channel models well-suited to the extra large-scale MIMO systems.

关键词： Surveys Analytical models Correlation Reviews Transmitting antennas Massive MIMO Receivers Channel models MIMO communication

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Nd@C3N4-photoredox/chlorine dual catalyzed synthesis and evaluation of antitumor activities of 4-alkylated sulfonyl ketimines

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Chinese Chemical Letters 2025年第2期36卷 412-416页

作者： Hong-Tao Ji yu-han Lu Yan-Ting Liu yu-Lin Huang Jiang-Feng Tian Feng Liu Yan-Yan Zeng Hai-Yan Yang Yong-Hong Zhang Wei-Min He Department of Ophthalmology The Affiliated Nanhua Hospital Hengyang Medical School University of South China School of Chemistry and Chemical Engineering University of South China Department of Lung Cancer and Gastroenterology Hunan Cancer Hospital The Affiliated Cancer Hospital of Xiangya School of Medicine Central South University

The first example of Nd@C3N4-photoredox/chlorine dual catalyzed alkylation with unactivated alkanes as the alkyl sources has been developed,which allows for the synthesis of various 4-alkylated cyclic sulfonyl *** this process,chlorine functions as both a redox and hydrogen atom transfer *** synergism of the reversible Nd2+/Nd3+and Clˉ/Cl˙redox pairs significantly enhances overall photocatalytic *** in vitro anticancer activity of 4-alkylated products was evaluated by using the CCK8assay against both human choroidal melanoma （MUM-2B） and lung cancer （A549） *** 3da showed approximately triple the potency of 5-fluorouracil.

关键词： Chlorine Dual catalysis Hydrogen atom transfer Redox catalyst Semiconductor

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International Youth Art Festival Paints New Picture of Future World

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中国新闻发布(英文版) 2025年第1期 53-56页

作者： yu han Wang Chunxin

World Children's Day on November 20 is a global day of action for children and by children, according to the United Nations Children's Fund. The 2024 theme for World Children's Day was “Listen to The Future.” We encourage the world to actively listen to children's hopes, dreams, and visions for the future, promoting children's right to participation.

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Novel Cellulosic Fiber Composites with Integrated Multi-Band Electromagnetic Interference Shielding and Energy Storage Functionalities

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Nano-Micro Letters 2025年第5期17卷 508-524页

作者： Xuewen han Cheng Hao yukang Peng han yu Tao Zhang Haonan Zhang Kaiwen Chen Heyu Chen Zhenxing Wang Ning Yan Junwen Pu Beijing Key Laboratory of Lignocellulosic Chemistry College of Materials Science and TechnologyBeijing Forestry UniversityBeijing 100083People’s Republic of China Department of Chemical Engineering and Applied Chemistry University of TorontoTorontoON M5S3E5Canada Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China Jiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass Materials Nanjing Forestry UniversityNanjing 210037People’s Republic of China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037People’s Republic of China

In an era where technological advancement and sustainability converge,developing renewable materials with multifunctional integration is increasingly in *** study filled a crucial gap by integrating energy storage,multi-band electromagnetic interference(EMI)shielding,and structural design into bio-based ***,conductive polymer layers were formed within the 2,2,6,6-tetramethylpiperidine-1-oxide(TEMPO)-oxidized cellulose fiber skeleton,where a mild TEMPO-mediated oxidation system was applied to endow it with abundant macropores that could be utilized as active sites(specific surface area of 105.6 m2 g-1).Benefiting from the special hierarchical porous structure of the material,the constructed cellulose fiber-derived composites can realize high areal-specific capacitance of 12.44 F cm^(-2)at 5 m A cm^(-2)and areal energy density of 3.99 m Wh cm^(-2)(2005 m W cm^(-2))with an excellent stability of maintaining 90.23%after 10,000 cycles at 50 m A cm^(-2).Meanwhile,the composites showed a high electrical conductivity of 877.19 S m-1 and excellent EMI efficiency(>99.99%)in multiple wavelength *** composite material’s EMI values exceed 100 d B across the L,S,C,and X bands,effectively shielding electromagnetic waves in daily *** proposed strategy paves the way for utilizing bio-based materials in applications like energy storage and EMI shielding,contributing to a more sustainable future.

关键词： Cellulose fiber skeleton TEMPO mediated oxidation In-situ polymerization Multi-band EMI shielding Energy storage

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Review of rare earth oxide doping-modified laser cladding of Fe-based alloy coatings

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China Foundry 2025年第1期22卷 12-22页

作者： han-yu Zhou Li-yao Li Yang Zhao Ming-xue Shen Huo-ping Zhao Ye-long Xiao Shao-peng Liu School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China

Conventional Fe-C alloy parts used in mechanical transmission and braking systems exposed to the external environment often suffer from wear and corrosion *** coating strengthening technologies have been explored to improve the surface performance and prolong service life of these *** these technologies,laser cladding has shown promise in producing Fe-based alloy coatings with superior interfacial bonding properties to the Fe-C alloy ***,the microstructure of the Fe-based alloy coating is more uniform and the grain size is finer than that of surfacing welding,thermal spraying,and plasma cladding,and the oxide film of alloying elements on the coating surface can improve the coating ***,Fe-based alloy coatings produced by laser cladding typically exhibit lower hardness,lower wear resistance,corrosion resistance,and oxidation resistance compared to coatings based on Co and Ni ***,these coatings are susceptible to defects such as pores and *** address these limitations,the incorporation of rare-earth oxides through doping in the laser cladding process has garnered significant *** approach has demonstrated substantial improvements in the microstructure and properties of Fe-based alloy *** paper reviewed recent research on the structure and properties of laser-cladded Fe-based alloy coatings doped with various rare earth oxides,including La_(2)O_(3),CeO_(2),and Y_(2)O_(3).Specifically,it discussed the effects of rare earth oxides and their concentrations on the structure,hardness,friction,wear,corrosion,and oxidation characteristics of these ***,the mechanisms by which rare earth oxides influence the coating’s structure and properties were *** review aimed to serve as a valuable reference for the application and advancement of laser cladding technology for rare earth modified Fe-based alloy coatings.

关键词： Fe-based alloys laser cladding rare-earth oxides microstructure tribological properties

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High-temperature strength of gel casting silica-based ceramic core

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China Foundry 2025年

作者： Hai-tian Zhang Yan Liu Cheng-dong Wang Zhong-liang Lu Kai Miao Sai Li yu han Di-chen Li State Key Laboratory of Manufacturing Systems Engineering School of Mechanical Engineering Xi'an Jiaotong University

Considering the fracture problem of the silica-based ceramic core in the integrated casting of hollow turbine blades during directional solidification, the influence of various whiskers, including silicon carbide whiskers,silicon nitride whiskers, and mullite whiskers, on the high-temperature strength of the silica-based ceramic core was investigated. Additionally, the formation of microstructure morphology and phase structure was *** results show that silicon carbide whiskers can reduce the microcracks caused by the shrinkage of cristobalite. During the sintering process, some of the silicon carbide whiskers oxidize and react with aluminum powder to form mullite, which can improve the high-temperature strength of the ceramic cores. When the content of silicon carbide whiskers is 3wt.%, the high-temperature bending strength of the cores reaches the maximum value of 21 MPa. Silicon nitride whiskers decompose in a high-temperature environment and react with aluminum powder in the matrix material to form mullite whiskers. When the content of silicon nitride whiskers is 5wt.%,the high-temperature bending strength of the cores reaches 20 MPa. By adding mullite whiskers, a structure of cristobalite wrapped mullite whiskers can be formed to achieve toughening. When the content of mullite whiskers is 4wt.%, the high-temperature bending strength can reach 17.2 MPa. By comparing the performance of silicon carbide whiskers, silicon nitride whiskers, and mullite whiskers, along with conducting slurry viscosity tests and casting experiments, it is determined that a ceramic slurry containing 4wt.% mullite whiskers is the most suitable for making the cores used in the integrated casting of hollow turbine blades.

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Lipomatous ependymoma with ZFTA:RELA fusion-positive:A case report

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World Journal of Clinical Cases 2025年第1期13卷 48-55页

作者： Xiao-yu Zhao Juan-han yu Yi-Hua Wang Yi-Xin Liu Lu Xu Lin Fu Ning Yi China Medical University The First Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Pathology The First Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Anshan Cancer Hospital Anshan 114000Liaoning ProvinceChina

BACKGROUND Ependymoma with lipomatous differentiation is a rare type of *** ZFTA fusion-positive supratentorial ependymoma is a novel tumor type in the 2021 World Health Organization classification of central nervous system *** fusion-positive lipomatous ependymoma has not been reported to *** SUMMARY We reported a case of a 15-year-old Chinese male who had a sudden convulsion lasting approximately six *** resonance imaging showed a round cystic shadow of approximately 1.9 cm×1.5 cm×1.9 cm under the right parieto-occipital *** examination showed characteristic perivascular pseudorosettes and adipose differentiation in the ***-chemical staining showed that the tumor cells were negative for cytokeratin,NeuN,Syn and p53,but positive for GFAP,vimentin and S-100 ***-ficant punctate intracytoplasmic EMA immunoreactivity was *** level of Ki-67 was about 5%.Genetic analysis revealed ZFTA:RELA fusion.A cranio-tomy with total excision of the tumor was *** follow-up time was 36 months,no evidence of disease recurrence was found in magnetic resonance *** Based on these findings,the patient was diagnosed as a ependymoma with ZFTA fusion and lipomatous *** case report provides information on the microscopic morphological features of ependymoma with ZFTA fusion and lipomatous differentiation,which can help pathologists to make a definitive diagnosis of this tumor.

关键词： Ependymoma Lipomatous Molecular classification Supratentorial ZFTA:RELA fusion Case report

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资源支持、组织能力与价值创造:社区互助养老服务可持续生产的驱动路径

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海南大学学报（人文社会科学版） 2025年第1期43卷 107-118页

作者：翟绍果韩煜西北大学公共管理学院陕西西安710127

社区互助养老服务何以可持续生产,基于“环境-组织-价值”分析框架,以我国37个社区互助养老典型案例为样本,运用模糊集定性比较分析方法;(fsQCA)探究社区互助养老服务可持续生产的组态驱动路径。研究表明:;(1)外部支持、社区资源、主体... 详细信息

社区互助养老服务何以可持续生产,基于“环境-组织-价值”分析框架,以我国37个社区互助养老典型案例为样本,运用模糊集定性比较分析方法;(fsQCA)探究社区互助养老服务可持续生产的组态驱动路径。研究表明:;(1)外部支持、社区资源、主体协同、制度化水平、技术赋能与价值创造通过组态效应影响社区互助养老服务的可持续生产;(2)外部支持与社区资源、制度化水平与技术赋能具有潜在替代性,社区资源和价值创造是组态形成的关键因素;(3)党政统合型、社区自组织型、技术嵌入型和协同驱动型是驱动社区互助养老服务可持续生产的4种优化路径。实现社区互助养老服务高水平的可持续生产应坚持系统联动思维,释放多元组态的复合驱动效应,重视社区资源和价值创造的关键作用,选择适宜不同地区发展基础的互助养老模式。

关键词：社区互助养老可持续生产驱动路径

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