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Achieving asymmetric redox chemistry for oxygen evolution reaction through strong metal-support interactions

Journal of Energy Chemistry 2024年第9期96卷 526-535页

作者： Shihao Wang Meiling Fan Hongfei pan Jiahui Lyu Jinsong Wu Haolin Tang Haining Zhang State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528200GuangdongChina International School of materials Science and Engineering(School of materials and Microelectronics) Wuhan University of TechnologyWuhan 430070HubeiChina Nanostructure Research Centre Wuhan University of TechnologyWuhan 430070HubeiChina Hubei Key Laboratory of Fuel Cell Wuhan University of TechnologyWuhan 430070HubeiChina

Water electrolysis poses a significant challenge for balancing catalytic activity and stability of oxygen evolution reaction(OER)*** this study,we address this challenge by constructing asymmetric redox chemistry through elaborate surface OO–Ru–OH and bulk Ru–O–Ni/Fe coordination moieties within single-atom Ru-decorated defective NiFe LDH nanosheets(Ru@d-NiFe LDH)in conjunction with strong metal-support interactions(SMSI).Rigorous spectroscopic characterization and theoretical calculations indicate that single-atom Ru can delocalize the O 2p electrons on the surface and optimize d-electron configurations of metal atoms in bulk through ***^(18)O isotope labeling experiment based on operando differential electrochemical mass spectrometry(DEMS),chemical probe experiments,and theoretical calculations confirm the encouraged surface lattice oxygen,stabilized bulk lattice oxygen,and enhanced adsorption of oxygen-containing intermediates for bulk metals in Ru@d-NiFe LDH,leading to asymmetric redox chemistry for *** Ru@d-NiFe LDH electrocatalyst exhibits exceptional performance with an overpotential of 230 mV to achieve 10 ma cm^(−2)and maintains high robustness under industrial current *** approach for achieving asymmetric redox chemistry through SMSI presents a new avenue for developing high-performance electrocatalysts and instills confidence in its industrial applicability.

关键词： Reaction redox chemistry Strong metal-support interactions Layered double hydroxides Electrocatalysts Water electrolysis

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Highβ-sitosterol-D-glucoside content in sweet potato varieties and its anti-breast cancer potential through multiple metastasis-associated signals

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Food Science and Human Wellness 2024年第5期13卷 2779-2789页

作者： Jinyin Zhang Lu Huang Xiang Tang Miao pan Xiaoli Ye Xuegang Li Hang ma School of Pharmaceutical Sciences Southwest UniversityChongqing 400716China School of Life Sciences Southwest UniversityChongqing 400715China

β-Sitosterol-D-glucoside(β-SDG)is a phytosterol compound whose antitumor activity has been confirmed by previous ***,its suppression on breast cancer remains *** that purpose,we isolatedβ-SDG from sweet potato and investigated the breast-cancer-inhibiting mechanism using proteomic *** sweet potato species S6 with highβ-SDG content were chosen form 36 species andβ-SDG was isolated by ***,an in situ animal model of breast cancer was established,andβ-SDG significantly reduced the tumor volume of MCF-7 xenograft *** analysis of tumor tissues revealed that 127 of these proteins were upregulated and 80 were *** ontology and network analysis showed that regulatory proteins were mainly associated with epithelial-mesenchymal transition(EMT),myogenesis,cholesterol homeostasis,oxidative phosphorylation and reactive oxygen pathways,while Vimentin,NDUF,VDAC1,PPP2CA and SNx9 were the most significant 5 node degree ***,in vitro and in vivo results showed that the protein expression of PPP2CA and Vimentin,which are markers of EMT,were involved in breast cancer cell metastasis and could be reversed byβ-*** work highlightsβ-SDG as a bioactive compound in sweet potato and the potential therapeutic effect ofβ-SDG for the treatment of breast cancer by inhibiting metastasis.

关键词： β-Sitosterol-D-glucoside(β-SDG) Sweet potato Breast cancer Proteomic Metastasis

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Preparation of tungsten-particle-reinforced Zr-based bulk metallic glass composites by two-step spark plasma sintering:microstructure evolution,densification mechanism and mechanical properties

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Rare Metals 2024年第4期43卷 1793-1808页

作者： Yun-Fei ma pan Gong mao Zhang Hui-EHu Zhen Peng Xiao Xu Xin Wang Mehdi malekan Xue-Feng Tang Lei Deng Jun-Song Jin Xin-Yun Wang State Key Laboratory of materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen518057China Department of Chemistry and materials Naval University of EngineeringWuhan430032China School of materials Science and Engineering Jiangsu UniversityZhenjiang212013China College of machine Shanghai Dianji UniversityShanghai201306China School of Metallurgy and materials Engineering College of EngineeringUniversity of TehranTehran 11155-4563Iran

A new two-step spark plasma sintering(TSS)process with low-temperature pre-sintering and high-temperature final sintering has been successfully applied to prepare the tungsten-particle(Wp)-reinforced bulk metallic glass composites(Wp/BMGCs).Compared to normal spark plasma sintering(NS),the densification rate and relative density of Wp/BMGCs can be improved by selecting TSS with appropriate sintering pressure in the low temperature pre-sintering ***,the compressive strength and plastic strain of 30%Wp/BMGCs prepared by TSS are both higher than those of the samples prepared by *** TSS process can significantly enhance the compressive strength of 30%Wp/BMGCs by 12%and remarkably increase the plastic strain by 50%,while the trend is completely opposite for 50%Wp/***-in situ experiments and finite element simulations reveal that uneven temperature distribution among particles during low-temperature pre-sintering causes local overheating at contact points between particles,accelerating formation of sintering neck between particles and plastic deformation of *** the volume fraction of Wp is low,TSS can improve the interface bonding between particles by increasing the number of sintering *** makes the fracture mode of Wp/BMGCs being predominantly transgranular ***,as the volume fraction of Wp increases,the adverse effects of Wp plastic deformation are becoming more and more *** aggregated Wp tends to form a solid"cage structure"that hinders the bonding between particles at the interface;correspondingly,the fracture behavior of Wp/BMGCs is mainly dominated by intergranular ***,reducing the sintering pressure during the low-temperature pre-sintering stage of TSS has been shown to effectively decrease plastic deformation in Wp,resulting in a higher degree of densification and better mechanical properties.

关键词： Bulk metallic glass composites Tungsten particle Two-step spark plasma sintering Densification mechanism Mechanical properties

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月面建造机器人现状与展望

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华中科技大学学报（自然科学版） 2024年第8期52卷 56-64页

作者：潘博马如奇北京空间飞行器总体设计部北京100094

月面建造机器人技术是各类月基驻留系统构建的关键技术,其发展水平及工程应用能力将直接影响月基系统的构建效率与运营质量.本文在对月球探测发展趋势及月球探测机器人发展现状进行简述的基础上,阐述了月面典型空间环境因素对以人为主... 详细信息

月面建造机器人技术是各类月基驻留系统构建的关键技术,其发展水平及工程应用能力将直接影响月基系统的构建效率与运营质量.本文在对月球探测发展趋势及月球探测机器人发展现状进行简述的基础上,阐述了月面典型空间环境因素对以人为主的月基系统构建模式的不利影响,从月基驻留系统勘探选址、设施建造、自主运营和科学研究等方面对月面建造机器人的发展必要性进行分析,并对月面建造机器人典型应用场景进行展望;提出了月面建造机器人面临的关键技术及未来发展趋势,为月面建造机器人的后续研究及工程应用提供参考.

关键词：月球探测月基系统月面建造月面机器人多机器人协同

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基于马尔可夫决策过程的边缘云业务迁移算法

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北京航空航天大学学报 2024年第6期50卷 1931-1939页

作者：马安华潘甦南京邮电大学宽带无线通信与传感网技术教育部重点实验室南京210003

在移动互联网中,当用户位置发生改变时,业务迁移可用来提升服务质量(QoS)。基于此,提出一种基于马尔可夫决策过程的边缘云业务迁移算法。与对比算法相比,所提算法考虑了不同业务类型对QoS的差异化需求,并全面考虑了业务迁移过程中的收... 详细信息

在移动互联网中,当用户位置发生改变时,业务迁移可用来提升服务质量(QoS)。基于此,提出一种基于马尔可夫决策过程的边缘云业务迁移算法。与对比算法相比,所提算法考虑了不同业务类型对QoS的差异化需求,并全面考虑了业务迁移过程中的收益及开销。所提算法将业务分为实时和非实时2类,将终端的业务运行状态和与服务器的距离作为状态空间,并基于与业务体验紧密相关的可用速率和时延2个QoS指标构建收益函数,同时将业务迁移过程中的系统资源消耗作为迁移开销,通过最大化全局收益来获取最优迁移策略。通过与对比算法的模拟比较,所提算法在多种场景下都有更高的全局收益。

关键词：业务迁移马尔可夫决策过程服务质量迁移开销业务类型

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Experimental study of the influencing factors and mechanisms of the pressure-reduction and augmented injection effect by nanoparticles in ultra-low permeability reservoirs

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Petroleum Science 2024年第3期21卷 1915-1927页

作者： pan Wang Yu-Hang Hu Liao-Yuan Zhang Yong Meng Zhen-Fu ma Tian-Ru Wang Zi-Lin Zhang Ji-Chao Fang Xiao-Qiang Liu Qing You Yan Zhang Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering China University of Geosciences(Beijing)Beijing100083China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Petroleum Engineering Technology Research Institute Sinopec Shengli Oilfield CompanyDongying257000ShandongChina Hekou Oil Production Plant Sinopec Shengli Oilfield CompanyDongying257200ShandongChina Petroleum Exploration and Production Research Institute SINOPECBeijing102206China CNPC Engineering Technology R&D Company Limited Beijing102206China

Nanoparticles(NPs)have gained significant attention as a functional material due to their ability to effectively enhance pressure reduction in injection processes in ultra-low permeability *** are typically studied in controlled laboratory conditions,and their behavior in real-world,complex environments such as ultra-low permeability reservoirs,is not well understood due to the limited scope of their *** study investigates the efficacy and underlying mechanisms of NPs in decreasing injection pressure under various injection conditions(25—85℃,10—25 MPa).The results reveal that under optimal injection conditions,NPs effectively reduce injection pressure by a maximum of 22.77%in core *** pressure reduction rate is found to be positively correlated with oil saturation and permeability,and negatively correlated with temperature and ***,particle image velocimetry(PIV)experiments(25℃,atmospheric pressure)indicate that the pressure reduction is achieved by NPs through the reduction of wall shear resistance and wettability *** work has important implications for the design of water injection strategies in ultra-low permeability reservoirs.

关键词： Nanoparticle Pressure reduction Augmented injection Ultra-low permeability reservoir

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magnetic resonance-guided focused ultrasound for essential tremor:a prospective,single center,single-arm study

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Neural Regeneration Research 2024年第9期19卷 2075-2080页

作者： Rui Zong Xuemei Li Chunyu Yin Jianfeng He Dekang Zhang Xiangbing Bian Lichao Huang Jiayou Zhou Zhipei Ling Lin ma Xin Lou Longsheng pan Xinguang Yu Seniro Department of Neurosurgery The First Medical Center of the PLA General HospitalBeijingChina Clinics of Cadre Department of OutpatientThe First Medical Center of the PLA General HospitalBeijingChina Department of Radiology The First Medical Center of the PLA General HospitalBeijingChina

The safety and effectiveness of magnetic resonance-guided focused ultrasound thalamotomy has been broadly established and validated for the treatment of essential *** 2018,the first magnetic resonance-guided focused ultrasound system in Chinese mainland was installed at the First Medical Center of the PLA General *** prospective,single center,open-label,single-arm study was part of a worldwide prospective multicenter clinical trial(*** Identifier:NCT03253991)conducted to confirm the safety and efficacy of magnetic resonance-guided focused ultrasound for treating essential tremor in the local *** 2019 to 2020,10 patients with medication refractory essential tremor were recruited into this open-label,single arm *** treatment efficacy was determined using the Clinical Rating Scale for *** was evaluated according to the incidence and severity of adverse *** of the subjects underwent a unilateral thalamotomy targeting the ventral intermediate *** the baseline assessment,the estimated marginal mean of the Clinical Rating Scale for Tremor total score was 58.3±3.6,and this improved after treatment to 23.1±6.4 at a 12-month follow-up assessment.A total of 50 adverse events were recorded,and 2 were defined as *** most common intraoperative adverse events were nausea and *** most frequent postoperative adverse events were paresthesia and equilibrium *** of the adverse events were mild and usually disappeared within a few *** findings suggest that magnetic resonance-guided focused ultrasound for the treatment of essential tremor is effective,with a good safety profile,for patients in Chinese mainland.

关键词： efficacy essential tremor magnetic resonance-guided focused ultrasound(MRgFUS) movement disorder safety stereotactic therapy thalamotomy ventral intermediate nucleus

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Low-coordination environment design of single Co atoms for efficient CO_(2) photoreduction

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Nano Research 2024年第5期17卷 3745-3751页

作者： Zhentao ma Qingyu Wang Limin Liu Rong-Ao Zhang Qichen Liu Peigen Liu Lihui Wu Chengyuan Liu Yu Bai Yida Zhang Haibin pan Xusheng Zheng National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China College of Chemistry and materials Science University of Science and Technology of ChinaHefei 230026China Experimental Center of Engineering and material Science University of Science and Technology of ChinaHefei 230026China

Photocatalytic carbon dioxide(CO_(2))to carbon monoxide(CO)offers a promising way for both alleviating the greenhouse effect and meeting the industrial ***,we constructed a Co single-atom catalyst with intentional low-coordination environment design on porous ZnO(denoted as Co1/ZnO).Impressively,Co1/ZnO exhibited a remarkable activity with a CO yield rate of 22.25 mmol·g^(-1)·h^(-1) and a selectivity of 80.2%for CO_(2) photoreduction reactions under visible *** incorporation of single Co atoms provided an additional photo-generated electron transfer channel,which suppressed the carrier recombination of ***,the unsaturated Co active sites were capable to adsorb CO_(2) molecule spontaneously,thus facilitating the activation of CO_(2) molecule during CO_(2) reduction course.

关键词： photocatalytic CO_(2)reduction single atoms low-coordination CO_(2)adsorption electron transfer

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Bisulfite-mediated base-free decarboxylative carbonylsulfination of alkenes:access to β-keto sultines

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Science China Chemistry 2024年

作者： Yongxin Zhang pan Zhou Xinyue ma Xiaoxiao Yang Xing Fang Yuxi Wang Chao Shu State Key Laboratory of Green Pesticide Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction CCNU-uOttawa Joint Research Centre College of Chemistry Central China Normal University (CCNU) Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University

A straightforward three-component decarboxylative cross-coupling of α-keto acids, alkenes and sodium bisulfite is established for the construction of otherwise challenging-to-access β-keto sultine derivatives. This reaction involves the photoinduced carbonylsulfination of alkenes and utilizes sodium bisulfite as both a sulfur dioxide surrogate and buffer agent for deprotonation of α-keto carboxylic acids. Of note, the practical procedure featured broad substrate scope and group tolerance for diverse biologically important molecules under mild and operationally simple conditions, using an organic photocatalyst. Mechanistic studies indicated that the transformation proceeds an apparent two-pronged radical addition/radical-polar crossover/SO2insertion/ionic cyclization relay process, distinct from traditional alkenes bifunctionalization.

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Achieving structurally stable O3-type layered oxide cathodes through site-specific cation-anion co-substitution for sodium-ion batteries

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Journal of Energy Chemistry 2024年第6期93卷 411-418,I0011页

作者： Yihao Shen Chen Cheng Xiao Xia Lei Wang Xi Zhou pan Zeng Jianrong Zeng Liang Zhang Institute of Functional Nano&Soft materials(FUNSOM) Soochow UniversitySuzhou 215123JiangsuChina Institute for Advanced Study School of Mechanical EngineeringChengdu UniversityChengdu 610106SichuanChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123JiangsuChina

O3-type layered oxides have garnered great attention as cathode materials for sodium-ion batteries because of their abundant reserves and high theoretical ***,challenges persist in the form of uncontrollable phase transitions and intricate Na^(+)diffusion pathways during cycling,resulting in compromised structural stability and reduced capacity over *** study introduces a special approach employing site-specific Ca/F co-substitution within the layered structure of O_(3)-NaNi_(0.5)Mn_(0.5)O_(2) to effectively address these ***,the strategically site-specific doping of Ca into Na sites and F into O sites not only expands the Na^(+)diffusion pathways but also orchestrates a mild phase transition by suppressing the Na^(+)/vacancy ordering and providing strong metal-oxygen bonding strength,*** as-synthesized Na_(0.95)Ca_(0.05)Ni_(0.5)Mn_(0.5)O_(1.95)F_(0.05)(NNMO-CaF)exhibits a mild O3→O3+O'3→P3 phase transition with minimized interlayer distance variation,leading to enhanced structural integrity and stability over extended *** a result,NNMO-CaF delivers a high specific capacity of 119.5 ma h g^(-1)at a current density of 120 ma g^(-1)with a capacity retention of 87.1%after 100 *** study presents a promising strategy to mitigate the challenges posed by multiple phase transitions and augment Na^(+)diffusion kinetics,thus paving the way for high-performance layered cathode materials in sodium-ion batteries.

关键词： Sodium-ion batteries O3-type layered oxides Site-specific co-doping Phase transition

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