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3rd IEEE International Conference on Industrial Electronics for Sustainable Energy Systems, IESES 2023

作者： Tashima, Daisuke Ryu, Tomi Fukuoka Institute of Technology Faculty of Engineering Department of Electrical Engineering Fukuoka Japan Graduate School of Engineering Fukuoka Institute of Technology Department of Material Science and Production Engineering Fukuoka Japan

ISBN: (纸本)9798350324754

Electric double-layer capacitors (EDLCs) are high-speed chargeable/dischargeable devices. The commercialization of this technology is hindered by the unavailability of inexpensive electrode materials. In this study, we present low-cost activated carbon electrodes fabricated from used shochu waste, and analyze their surface and electrochemical characteristics for the first time. We then determine the optimal time and temperature required for the activation of the KOH-CO2 double-step reactions. Additionally, the obtained shochu waste carbons (SWCs) are used as the carbon electrodes of EDLCs, whose half-cell capacitances are evaluated using cyclic voltammetry. Their electrolyte and charge transfer resistances are estimated by measuring the corresponding AC impedance under both non-aqueous and aqueous electrolytes. The withstand voltage of the aqueous electrolyte is approximately 1.2 V, which is the voltage at which the electrolysis of water occurs;however, it lacks sufficient energy density. Therefore, we added sodium polyacrylate to the electrolyte to gelatinize it and prevent electrolysis, thereby improving the withstand voltage up to 3.5 V and obtained an energy density of 4.6 Wh/kg. © 2023 IEEE.

关键词： Supercapacitor

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A study of highly activated hydrogen evolution reaction performance in acidic media by 2D heterostructure of N and S doped graphene on MoO_(x)

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Carbon Energy 2023年第11期5卷 68-80页

作者： Kubra Aydin Seongwon Woo Vinit Kaluram Kanade Seulgi Choi Chisung Ahn Byungkwon Lim Taesung Kim SKKU Advanced Institute of Nanotechnology(SAINT) Department of Nano Science and TechnologySungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea School of Advanced Material Science and Engineering Department of Nano Science and TechnologySungkyunkwan UniversitySuwonGyeonggi‐doRepublic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea Heat&Surface Technology R&D Department Korea Institute of Industrial TechnologySiheung‐siGyeonggi‐doRepublic of Korea

Herein,a layer of molybdenum oxide(MoO_(x)),a transition metal oxide(TMO),which has outstanding catalytic properties in combination with a carbonbased thin film,is modified to improve the hydrogen production performance and protect the MoO_(x)in acidic media.A thin film of graphene is transferred onto the MoO_(x)layer,after which the graphene structure is doped with N and S atoms at room temperature using a plasma doping method to modify the electronic structure and intrinsic properties of the *** oxygen functional groups in graphene increase the interfacial interactions and electrical contacts between graphene and MoO_(x).The appearance of surface defects such as oxygen vacancies can result in vacancies in MoO_(x).This improves the electrical conductivity and electrochemically accessible surface *** the number of defects in graphene by adding dopants can significantly affect the chemical reaction at the interfaces and improve the electrochemical *** defects in graphene play a crucial role in the adsorption of H^(+)ions on the graphene surface and their transport to the MoO_(x)layer *** enables MoO_(x)to participate in the reaction with the doped graphene.N^(‐)and S^(‐)doped graphene(NSGr)on MoO_(x)is active in acidic media and performs well in terms of hydrogen *** initial overpotential value of 359 mV for the current density of−10 mA/cm^(2)is lowered to 228 mV after activation.

关键词： heteroatom‐doped graphene hydrogen evolution reactions metal‐free catalysts transition metal oxides van der Waals(vdWs)heterostructures

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Non-fluorinated durable water repellent and stain resistant coating

Non-fluorinated durable water repellent and stain resistant ...

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作者： Kaiwen Wang Yijun Shen Mingzhang Duan Tairan Wu Jiaqi Zhao Ji Wang Department of Material Science and Engineering University of Minnesota Department of Chemical Engineering Carnegie Mellon University Department of Material Science and Engineering Beijing University of Chemical Technology Department of Material Science and Engineering University of California

Fluorinated materials have been broadly used in the industry of water repellent and stain *** fluorinated materials have low surface tension,and the coatings could easily be manufactured as water-repellent and stain-resistant,fluorinated materials dominate the market for breathable waterproof ***,these materials had substantial health hazards because of the toxicity of fluorinated ***,many governments also regulate fluorinated materials for health *** a result,non-fluorinated materials replacing fluorinated materials have become a trend in the *** a result,many companies are actively looking for solutions for non-fluorinated water-repellent and stainresistant *** literature review will give a comprehensive understanding of waterrepellent properties,materials surfaces,and stain-resistance properties,materials,and ***,this review would also include reviews of natural water repellent and stain ***,this review will also talk about the theories behind the ***,the fabrication process limitation and future outlook will be discussed in this review.

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Polymer electrolytes for flexible zinc-air batteries:Recent progress and future directions

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Nano Research 2024年第7期17卷 6058-6079页

作者： Jing Wu Wen-Ya Wu Suxi Wang Dan Kai Enyi Ye Warintorn Thitsartarn Janet Beng Hoon Tan Jianwei Xu Qingyu Yan Qiang Zhu Xian Jun Loh Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)1 Pesek RoadJurong IslandSingapore 627833Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WayInnovis#08-03Singapore 138634Singapore School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Department of Material Science and Engineering National University of Singapore9 Engineering Drive 1#03-09 EASingapore 117575Singapore

This review article delves into the development of electrolytes for flexible zinc-air batteries(FZABs),a critical component driving the advancement of flexible *** started by surveying the current advancements in electrolyte technologies,including solid-state and gel-based types,and their contributions to enhance the flexibility,efficiency,and durability of ***,we explored the challenges in this domain,focusing on maintaining electrolyte stability under mechanical stress,ensuring compatibility with flexible substrates,optimizing ion conductivity,and under harsh environmental ***,the key issues regarding interface details between electrolyte and the electrodes are covered as *** then discussed the future of electrolyte development in FZABs,highlighting potential avenues such as materials development,sustainability,in-situ studies,and battery *** review offers an in-depth overview of the advancements,challenges,and potential breakthroughs in creating electrolytes for FZABs over the past five *** serves as a guide for both researchers and industry professionals in this dynamic area.

关键词： flexible zinc-air batteries electrolyte polymer hydrogel electrolyte-electrode interface

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Biomechanical Analysis of Gymnastics Movements Using Wearable Motion Capture Systems and Linear Sensors: A Case Study of the Kipping Bar Muscle-Up 7

Biomechanical Analysis of Gymnastics Movements Using Wearabl...

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7th International Conference on material Strength and Applied Mechanics, MSAM 2024

作者： Liu, Wei Lu, Zhenghui Li, Xin Gao, Zixiang Xu, Yining Mei, Qichang Fekete, Gusztáv Gu, Yaodong Department of Material Science and Technology Audi Hungaria Faculty of Vehicle Engineering Széchenyi István University Gyor Hungary Faculty of Engineering University of Pannonia Veszprém Hungary Faculty of Sports Science Ningbo University Ningbo China

ISBN: (纸本)9781643685472

Gymnastics moves are complex and varied, needing precise technique and body coordination, which traditional biomechanics methods struggle to capture in detail. This study aims to look at and judge how well new motion capture and analysis technology works in gymnastics biomechanics. This study picks the kipping bar muscle up move and uses the IMU-based Xsens system and the GymAware RS unit power test system to finely look at how athletes do the move in terms of body position, power, work done by the body, and main upper limb joint movements. The study tested 8 male elite collegiate gymnasts, collecting movement data with Xsens and power data with GymAware RS unit. Results show the kipping bar muscle up takes 1.42 seconds, with a 1.13-meter shift of the body's center and a peak speed of 3.40m/s. In terms of power, the peak output was 2772.96J/s, showing the need for explosive power and fast strength. Also, the total work done was 889.70J, showing the move's efficiency and energy level. This study shows that new motion capture and analysis tech is effective in capturing complex gymnastics moves. The use of these techs not only expands the ways biomechanics can be studied but also helps in making training better and improving how efficiently moves are done. © The Author(s), 2024.

关键词： Muscle

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Real-space imaging of photo-generated surface carrier transport in 2D perovskites

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光：科学与应用（英文版） 2025年第5期14卷 1290-1299页

作者： Lijie Wang Wentao Wu Jie Yang Razan Nughays Yifan Zhou Esma Ugur Xi Zhang Bingyao Shao Jian-Xin Wang Jun Yin Stefaan De Wolf Osman M.Bakr Omar F.Mohammed Advanced Membranes and Porous Materials Center(AMPM) Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Key Laboratory of Material Physics Ministry of EducationSchool of PhysicsZhengzhou UniversityZhengzhouChina Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong SARChina KAUST Solar Center(KSC) King Abdullah University of Science(KAUST)ThuwalSaudi Arabia KAUST Catalysis Center(KCC) King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Advanced Membranes and Porous Materials Center(AMPM) Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia KAUST Catalysis Center(KCC) King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia

In layered two-dimensional(2D)perovskites,the inorganic perovskite layers sandwiched between cation spacers create quantum well(QW)structures,showing large exciton binding energies that hinder the efficient dissociation of excitons into free *** leads to poor carrier transport properties and low-performance light-conversion-based devices,and the direct understanding of the underlying physics,particularly concerning surface states,remains extremely difficult,if not impossible,due to the challenges in real-time ***,we utilized four-dimensional scanning ultrafast electron microscopy(4D-SUEM),a highly sensitive technique for mapping surface carrier diffusion that diverges from those in the bulk and substantially affects material *** directly visualize photo-generated carrier transport over both spatial and temporal dimensions on the top surface of 2D perovskites with varying inorganic perovskite layer thicknesses(n=1,2,and 3).The results reveal the photo-induced surface carrier diffusion rates of～30cm2·s-1 for n=1,～180cm2·s-1 for n=2,and～470cm2·s-1 for n=3,which are over 20 times larger than *** is because charge carrier transmission channels have much wider distributions on the top surface compared to the bulk,as supported by the Density Functional Theory(DFT)***,our findings represent the demonstration to directly correlate the discrepancies between surface and bulk carrier diffusion behaviors,their relationship with exciton binding energy,and the number of layers in 2D perovskites,providing valuable insights into enhancing the performance of 2D perovskite-based optoelectronic devices through interface engineering.

关键词： transport imaging surface carrier perovskites photo-generated real-space

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3D Printed Biomimetic Metamaterials with Graded Porosity and Tapering Topology for Improved Cell Seeding and Bone Regeneration

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Bioactive materials 2023年第7期25卷 677-688页

作者： Lei Zhang Bingjin Wang Bo Song Yonggang Yao Seung-Kyum Choi Cao Yang Yusheng Shi State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA

Biomimetic metallic biomaterials prepared for bone scaffolds have drawn more and more attention in recent ***,the topological design of scaffolds is critical to cater to multi-physical requirements for efficient cell seeding and bone regeneration,yet remains a big scientific challenge owing to the coupling of mechanical and mass-transport properties in conventional scaffolds that lead to poor control towards favorable modulus and permeability ***,inspired by the microstructure of natural sea urchin spines,biomimetic scaffolds constructed by pentamode metamaterials(PMs)with hierarchical structural tunability were additively manufactured via selective laser *** mechanical and mass-transport properties of scaffolds could be simultaneously tuned by the graded porosity(B/T ratio)and the tapering level(D/d ratio).Compared with traditional metallic biomaterials,our biomimetic PM scaffolds possess graded pore distribution,suitable strength,and significant improvements to cell seeding efficiency,permeability,and impact-tolerant capacity,and they also promote in vivo osteogenesis,indicating promising application for cell proliferation and bone regeneration using a structural innovation.

关键词： Biomimetic biomaterials Pentamode metamaterials Selective laser melting Mass-transport properties Bone scaffolds

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Predicting synthesis window of β-TaON with thermodynamic modeling

arXiv

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arXiv 2024年

作者： LaBelle, Dmitri Hu, Yong-Jie Department of Material Science and Engineering Drexel University United States

Phase-pure synthesis has been a major challenge for metal oxynitrides due to their sensitivity to synthesis conditions and the limited understanding of the underlying thermodynamics. The beta-phase tantalum oxynitride (β-TaON), a promising material for applications in photo- catalysis and energy storage, is particularly difficult to synthesize in a reproducible, phase-pure form. In this work, a computational thermodynamic model with experimental validation is presented to evaluate the phase-pure synthesis conditions for β-TaON via ammonolysis reactions. The finite-temperature thermochemical properties of the reactant, product, and byproduct phases are predicted via first-principles calculations with the quasi-harmonic approach (QHA) as well as implemented from available thermodynamic databases. With the thermochemical properties, a thermodynamic model based on the "CALculation of PHAse Diagrams" (CALPAHD) approach is developed to assess the phase equilibria associated with the synthesis reactions and correspondingly predict the synthesis window for β-TaON. A three-dimensional phase diagram is predicted as a function of gas composition and temperature, providing insights into optimal synthesis conditions. The computational predictions are further compared with available experimental data, offering a systematic framework for phase-pure β-TaON synthesis. © 2024, CC BY-NC-ND.

关键词： Tantalum compounds

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Enabling stable 4.6 V LiCoO_(2) cathode through oxygen charge regulation strategy

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Journal of Energy Chemistry 2023年第1期76卷 557-565,I0014页

作者： Wen Zhang Xiaoyu Zhang Fangyuan Cheng Meng Wang Jing Wan Yuyu Li Jia Xu Yi Liu Shixiong Sun Yue Xu Chun Fang Qing Li Jiantao Han Yunhui Huang State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Applied Physics Chongqing UniversityChongqing 401331China Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan UniversityWuhan 430056HubeiChina

LiCoO_(2) is the preferred cathode material for consumer electronic products due to its high volumetric energy density. However, the unfavorable phase transition and surface oxygen release limits the practical application of LiCoO_(2)at a high-voltage of 4.6 V to achieve a higher energy density demanded by the market. Herein, both bulk and surface structures of LiCoO_(2)are stabilized at 4.6 V through oxygen charge regulation by Gd-gradient doping. The enrichment of highly electropositive Gd on LiCoO_(2) surface will increase the effective charge on oxygen and improve the oxygen framework stability against oxygen *** the other hand, Gd ions occupy the Co-sites and suppress the unfavorable phase transition and microcrack. The modified LiCoO_(2) exhibits superior cycling stability with capacity retention of 90.1% over 200 cycles at 4.6 V, and also obtains a high capacity of 145.7 m Ah/g at 5 C. This work shows great promise for developing high-voltage LiCoO_(2) at 4.6 V and the strategy could also contribute to optimizing other cathode materials with high voltage and large capacity, such as cobalt-free high-nickel and lithiumrich manganese-based cathode materials.

关键词： Li-ion batteries 4.6 V LiCoO_(2) Gd-gradient doping Oxygen charge Cycle stability

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Separation and Recovery of Niobium Coating from 440C Tool Steel by High-Temperature Oxidation

High Temperature Corrosion of Materials

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High Temperature Corrosion of materials 2025年第2期102卷

作者： Gupta, Akanksha Mishra, Brajendra Department of Material Science and Engineering Worcester Polytechnic Institute WorcesterMA01609 United States

Niobium is a critical and strategic element used in major industries like aerospace, defense, and electronics. In addition to primary extraction, it is necessary to recover niobium from secondary sources to meet its growing demand. In the present study, niobium coating recovery from type 440C tool steel substrate was studied using high-temperature oxidation process. The oxidation behavior of the bimetallic composite was evaluated in air atmosphere at 450–600 °C. The post-oxidation steel substrate’s resistance to oxidation was assessed by investigating elemental maps, phases formed, and hardness tensile profiles. The post-oxidized characteristics of steel was investigated in order to assess its performance for extension of service life for intended application. In addition, the oxidation mechanism of metallic niobium and type 440C tool steel was also investigated separately using thermogravimetric analysis. The results demonstrated the viability of a high-temperature oxidation technique for recovery of niobium as niobium pentoxide, which is a value-added material. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2025.

关键词： Niobium

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