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Spatial Control of Lithium Deposition by Controlling the Lithiophilicity with Copper(Ⅰ)Oxide Boundaries

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Energy & Environmental Materials 2023年第5期6卷 183-191页

作者： Ju Ye Kim Oh B.Chae Gukbo Kim woo-Bin Jung Sungho Choi do Youb Kim San Moon Jungdon Suk Yongku Kang Mihye Wu Hee-Tae Jung Department of Chemical and Biomolecular Engineering(BK-21 four)and Institute for Nanocentury Korea Advanced Institute of Science and Technology(KAIST)DaejeonKorea Chemical&Process Technology Division Korea Research Institute of Chemical TechnologyDaejeon 34114Korea School of Engineering Brown UniversityProvidence 02912USA Department of Chemistry University of Rhode IslandKingston 02881USA School of Engineering and Applied Sciences Harvard UniversityCambridge 02138USA Advanced Materials Division Korea Research Institute of Chemical TechnologyDaejeon 34114Korea

Spatial control of lithium deposition is the most important issue in lithium-metal batteries because of the considerable control of lithium dendrite suppression via the uniform distribution of Li^(+)*** seed materials are crucial for the behavior of lithium deposition,in-depth studies on their physical and chemical control have not been ***,we describe a new design of seed structure comprising a wrinkled Cu/graphene substrate surrounded by copper(Ⅰ)oxide(Cu_(2)O)on a graphene grain boundary over a large area,which is fabricated by the oxidation of the Cu surface via graphene boundary defects by using chemical vapor deposition(CVD).Scanning and transmission electron microscopy results reveal that Cu_(2)O on the graphene boundary can render a preferential reaction with lithium during the first deposition and assist in the uniform deposition of lithium by preventing the agglomeration of lithium clusters during the second *** two-step process is attributed to the degree of selectivity due to the difference in lithium affinity,which allows long-term electrochemical stability and a high rate capability via boundary *** study highlights the significance of the boundary effect,which can open new avenues for the formation of a large family of seed structures in lithium-metal batteries.

关键词： Cu_(2)O boundary dendrite-free lithium deposition lithium-metal battery lithium spatial control seed boundary effect

Biomass seaweed-derived n itrogen self-doped porous carb on anodes for sodium-ion batteries:Insights into the structure and electrochemical activity

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Journal of Energy Chemistry 2022年第1期31卷 286-295,I0008页

作者： Chenrayan Senthil Jae woo Park Nitheesha Shaji Gyu Sang Sim Chang woo Lee Department of Chemical Engineering(Integrated Engineering)&Center for the SMART Energy Platform College of EngineeringKyung Hee University1732 Deogyeong-daeroCihuengYonginGyeonggi 17104South Korea

Sustainable transformation and efficient utilization of biomasses and their derived materials are environ-mentally as well as economically compliant *** seaweed-derived nitrogen self-doped porous carbon with tailored surface area and pore structures are prepared through carb on izatio n and *** in fluence of carb on ization temperature on morphology,surface area,and heteroatom dopants are investigated to optimize sodium-ion storage ***-derived nitrogen selfdoped activated carbon(SAC)as anode materials for sodium-ion batteries exhibits remarkable reversible capacity of 303/192 mAh g^(-1) after 100/500 cycles at current densities of 100/200 mA g^(-1) respectively,and a good rate *** interconnected and porous conducting nature along with the heteroatom dopant role in creating defective sites and charge stabilization are favorable for ion storage and diffusion and electron transport,indicating the electrodes can offer improved electrochemical *** addition,post-mortem analysis of the cycled carbon electrodes through ex-situ tools demonstrates the sodium-ion storage mechanism.

关键词： Biomass Heteroatom self-doping Porous carbon Anode Sodium-ion batteries Post-mortem ex-situ analysis

Sub-2 nm mixed metal oxide for electrochemical reduction of carbon dioxide to carbon monoxide

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能源化学:英文版 2023年第9期84卷 303-310页

作者： Devina Thasia Wijaya Andi Haryanto Hyun woo Lim Kyoungsuk Jin Chan woo Lee Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Chemistry Korea UniversitySeoul 02841Republic of Korea

Mixed metal oxide(MMO) represents a critical class of materials that can allow for obtaining a dynamic interface between its components:reduced metal and its metal oxide counterpart during an electrocatalytic ***,a synthetic method utilizing a MOF-derived micro/mesoporous carbon as a template to prepare sub-2 nm MMO catalysts for CO_(2) electro reduction is *** from the zeolite imidazolate framework(ZIF-8),the pyrolyzed derivatives were used to synthesize sub-2 nm Pd-Ni MMO with different *** Ni-rich(Pd_(20)-Ni_(80)/ZC) catalyst exhibits unexpectedly superior performance for CO production with an improved Faradaic efficiency(FE) of 95.3% at the current density of 200 mA cm^(-2) at-0.56 V *** hydrogen electrode(RHE) compared to other Pd-Ni compositions.X-ray photoelectron spectroscopy(XPS) analysis confirms the presence of Ni^(2+) and Pd^(2+) in all compositions,demonstrating the presence of *** functional theory(DFT) calculation reveals that the lower CO binding energy on the surface of the Pd_(20)-Ni_(80) cluster eases CO desorption,thus increasing its *** work provides a general synthetic strategy for MMO electrocatalysts and can pave a new way for screening multimetallic catalysts with a dynamic electrochemical interface.

关键词： Carbon dioxide reduction Mixed metal oxide Nanoalloy Carbon monoxide Metal-organic framework

Dislocation characteristics and dynamic recrystallization in hot deformed AM30 and AZ31 alloys

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Journal of Magnesium and Alloys 2022年第12期10卷 3495-3505页

作者： Hyeon-woo Son Soong-Keun Hyun Metallic Materials Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Inha UniversityIncheon 22212Republic of Korea

Zn addition to Mg alloys activates non-basal slip or twinning with solute softening *** the other hand,the effects of the Zn solute on the macroscopic dislocation behavior and dynamic recrystallization are not completely ***,it is unclear ifslip can be affected by changes in the c/a ratio of solute *** study was conducted to understand the solute strengthening of Zn addition and its effects on the dislocation characteristics and dynamic recrystallization.A hot torsion test was performed on both AM30 and AZ31 alloys up to a high strain to investigate the Zn solute effect on the dislocation characteristics and dynamic *** dislocation components of the hot torsioned alloys were evaluated by X-ray line profile analysis and electron backscatter *** results showed that the Zn solutes slightly accelerate strain accumulation at the initial stages of hot deformation,which accelerated recrystallization at high *** dislocation characteristics were changed dynamically by Zn addition:fortified-type slip,dislocation arrangement and strain anisotropy *** most important point was that the dislocation characteristics were changed dramatically at the critical strain for recrystallization and high strain *** addition of Zn also acted greatly in these strain *** indicates that the rapid formation of-type slip at the serrated grain boundaries occurs at the initiation of dynamic recrystallization and the increase in the grain triple junction because grain refinement has a great influence on the dislocation characteristics at high strain.

关键词： Magnesium alloy X-ray line profile Solid solution Dislocation density Dynamic recrystallization

基于相干光调控的无透镜光纤成像及其应用(特邀)

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激光与光电子学进展 2024年第6期61卷 25-53页

作者：程圣福仲天庭胡子敏李浩然赖溥祥香港理工大学生物医学工程学系中国香港香港理工大学光子技术研究院中国香港香港理工大学深圳研究院广东深圳518063

基于多模光纤或多芯光纤的无透镜超细光纤内窥成像技术近些年获得了快速发展,有望成为下一代的极微创、高分辨率内窥显微镜。通过对相干入射光场的时空调控,该技术可克服多模光纤中模式色散或多芯光纤中相位畸变的影响,在无需光纤末端... 详细信息

基于多模光纤或多芯光纤的无透镜超细光纤内窥成像技术近些年获得了快速发展,有望成为下一代的极微创、高分辨率内窥显微镜。通过对相干入射光场的时空调控,该技术可克服多模光纤中模式色散或多芯光纤中相位畸变的影响,在无需光纤末端透镜或扫描器件的情况下实现高分辨率的聚焦、成像及相关应用。此外,在无透镜光纤内窥成像或图像传输等场景下,通过构建物理或深度学习模型,从光纤输出测量中也能实现物体信息重建。对相干光纤无透镜成像技术的发展进行综述,首先说明无透镜光纤成像的基础原理,并从主动波前调控和被动目标重建这两类角度阐述无透镜光纤成像方法,接着介绍一些先进光纤成像模态和技术,列举光纤成像相关应用,最后分析该领域所面临的挑战,总结并展望其进一步发展方向和应用前景。

关键词：多模光纤多芯光纤波前整形内窥成像光学显微成像深度学习

Role of milk carbohydrates in intestinal health of nursery pigs: a review

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Journal of Animal Science and Biotechnology 2022年第3期13卷 628-641页

作者： Ki Beom Jang Sung woo Kim Department of Animal Science North Carolina State UniversityRaleighNC 27695USA

Intestinal health is essential for the resistance to enteric diseases and for nutrient digestion and absorption to support *** intestine of nursery pigs are immature and vulnerable to external challenges,which cause negative impacts on the structure and function of the *** nutritional interventions,the benefits of milk are significant for the intestinal health of *** coproducts have traditionally been used in starter feeds to improve the growth of nursery pigs,but their use is somewhat limited due to the high costs and potential risks of excessive lactose on the ***,understanding a proper feeding level of milk carbohydrates is an important start of the feeding *** nursery pigs,lactose is considered a highly digestible energy source compared with plant-based starch,whereas milk oligosaccharides are considered bioactive compounds modulating intestinal immunity and ***,milk carbohydrates,mainly composed of lactose and oligosaccharides,have essential roles in the intestinal development and functions of nursery *** proper feeding levels of lactose in starter feeds could be variable by weaning age,body weight,or genetic *** of lactose and milk oligosaccharides have been broadly studied in human health and animal ***,this review focuses on the mechanisms of lactose and milk oligosaccharides affecting intestinal maturation and functions through modulation of enterocyte proliferation,intestinal immunity,and intestinal microbiota of nursery pigs.

关键词： Intestinal health Lactose Milk carbohydrates Milk oligosaccharides Nursery pig

Intestinal microbiota and its interaction to intestinal health in nursery pigs

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Animal Nutrition 2022年第1期8卷 169-184页

作者： Marcos Elias Duarte Sung woo Kim Department of Animal Science North Carolina State UniversityRaleighNC27695United States

The intestinal microbiota has gained increased attention from researchers within the swine industry due to its role in promoting intestinal maturation,immune system modulation,and consequently the enhancement of the health and growth performance of the *** review aimed to provide updated scientific information on the interaction among intestinal microbiota,dietary components,and intestinal health of *** small intestine is a key site to evaluate the interaction of the microbiota,diet,and host because it is the main site for digestion and absorption of nutrients and plays an important role within the immune *** diet and its associated components such as feed additives are the main factors affecting the microbial composition and is central in stimulating a beneficial population of *** microbiotaehost interaction modulates the immune system,and,concurrently,the immune system helps to modulate the microbiota *** direct interaction between the microbiota and the host is an indication that the mucosa-associated microbiota can be more effective in evaluating its effect on health *** was demonstrated that the mucosa-associated microbiota should be evaluated when analyzing the interaction among diets,microbiota,and *** addition,supplementation of feed additives aimed to promote the intestinal health of pigs should consider their roles in the modulation of mucosa-associated microbiota as biomarkers to predict the response of growth performance to dietary interventions.

关键词： Intestinal health Mucosa-associated microbiota Nursery pig

Both metaxin and Tom20 together with two mitochondria-specific motifs support mitochondrial targeting of dual-targeting AtSufE1

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Journal of Integrative Plant Biology 2022年第8期64卷 1596-1613页

作者： Seungjin woo Byeongho Moon Inhwan Hwang Department of Life Sciences Pohang University of Science and TechnologyPohang 790‐784Korea

Plant cells have two endosymbiotic organelles,chloroplasts,and *** organelles perform specific functions that depend on organelle-specific *** majority of chloroplast and mitochondrial proteins are specifically imported by the transit peptide and presequence,***,a significant number of proteins are also dually targeted to these two ***,it is not fully understood how proteins are dually targeted to both chloroplasts and *** this study,the mechanism underlying mitochondrial targeting of dual targeting At Suf E1 in Arabidopsis was *** N-terminal fragment containing 80 residues of AtSufE1(AtSufE1N80)was sufficient to confer dual targeting of reporter protein,At SufE1N80:GFP,in *** sequence motifs,two arginine residues at 15and 21positions,and amino acid(aa)sequence motif AKTLLLRPLK from the 31to 40aa position,were responsible for targeting to mitochondria a portion of reporter proteins amid the chloroplast *** sequence motif PSEVPFRRT from the 41 stto 50 thaa position constitutes a common motif for targeting to both chloroplasts and *** mitochondrial import of At Suf E1:N80,Metaxin played a critical *** addition,Bi FC and protein pull-down experiments showed that At Suf E1N80 specifically interacts with import receptors,Metaxin and *** interaction of At Suf E1N80 with Metaxin was required for the interaction with *** on these results,we propose that mitochondrial targeting of dual-targeting At Suf E1 is mediated by both mitochondria-specific and common sequence motifs in the signal sequence through the interaction with import receptors,Metaxin and Tom20,in a successive manner.

关键词： AtSufE1 chloroplasts common motif dual targeting metaxin mitochondria mitochondria-specific motif Tom20

Mo and Ta addition in NbTiZr medium entropy alloy to overcome tensile yield strength-ductility trade-off

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Journal of Materials Science & Technology 2022年第14期109卷 176-185页

作者： Muhammad Akmal Hyun woo Seong Ho Jin Ryu Department of Materials Science and Engineering KAISTDaejeonYuseong-gu 34141South Korea Department of Nuclear and Quantum Engineering KAISTDaejeonYuseong-gu 34141South Korea

In this study,single-phase NbTiZr and NbTiZr(MoTa)_(0.1) medium-entropy alloys(MEAs)were investigated for their use in biomedical *** alloys were prepared by arc melting,and were then cold-rolled,annealed,and characterized in terms of phase analysis,mechanical properties,fractography,and wear *** alloys showed a single body-centered cubic phase with superior mechanical,and tribological properties compared to commercially available biomedical *** and Ta-containing MEAs showed higher tensile yield strength(1060±18 MPa)and higher tensile ductility(~20%),thus overcoming the strength-ductility trade-off with no signs of transformation-induced plasticity,twinning,or *** generalized stacking fault energy(GSFE)calculations on the{112}slip system by the first-principles calculations based on density functional theory showed that the addition of less than0.2 molar fraction of Mo and Ta lowers the GSFE *** behavior posits the increase in ductility of the alloy by facilitating slips although strength is also increased by solid solution *** wear resistance of both alloys against hardened steel surfaces was superior to that of commercial biomedical ***,we concluded that NbTiZr(MoTa)_(0.1)MEA with good tensile ductility is a potential candidate for biomedical implants.

关键词： Medium-entropy alloys Wear-resistant Biomedical implants Solid solution hardening Staking fault energy