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Boosting overall water splitting by incorporating sulfur into NiFe(oxy)hydroxide

Journal of Energy Chemistry 2022年第1期31卷 364-371,I0010页

作者： Chiho Kim Seong Hyun Kim Seunghun Lee Ilyeong Kwon Seong Hyun Kim Shinho kim Changgyu Seok Yoo Sei Park Yangdo Kim Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea BK21 Four Innovative Graduate Education Program for Global High-tech Materials&PartsPusan National UniversityBusan 46241Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH).Pohang 37673Republic of Korea

Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water ***-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal *** incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH *** enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of *** performance for overall water splitting was achieved with an alkaline water *** was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural *** study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and *** addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.

关键词： Overall water splitting Hydrogen production Sulfur incorporated NiFe(oxy)hydroxide Electrocatalysts Solar-driven water splitting

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Mesoporous WO_(3)-Dot-Decorated Flexible Electrodes for the Determination of Industrial Pollutants

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Energy & Environmental materials 2025年第2期8卷 273-283页

作者： Aneesh Koyappayil Hyunho Seok Gwan Hyun Choi Sachin Chavan Sangho Yeon Sihoon Son Anna Go Jinhyoung Lee Keon-Woo Kim Dongho Lee Hyun-Bin Choi Hyeong-U Kim Jin Kon Kim Taesung Kim Min-Ho Lee School of Integrative Engineering Chung-Ang UniversitySeoul 06974South Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Korea Materials Architecturing Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Korea National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer Pohang University of Science and Technology(POSTECH)PohangGyungbuk 37673Korea Department of Semiconductor Convergence Engineering Sungkyunkwan UniversitySuwon 16419Korea Semicondcutor Manufacturing Research Center Korea Institute of Machinery and Materials(KIMM)Daejeon 34103Korea Department of Nano-Mechatronics University of Science and Technology(UST)Daejeon 34113Korea

This study demonstrates the fabrication of mesoporous tungsten trioxide(WO_(3))-decorated flexible polyimide(PI)electrodes for the highly sensitive detection of catechol(CC)and hydroquinone(HQ),two environmental ***-inorganic composite dots are formed on flexible PI electrodes using evaporation-induced self-assembly(EISA)and electrospray *** EISA process is induced by a temperature gradient during electrospray,and the heated substrate partially decomposes the organic parts etched by O2 plasma,creating mesoporous *** pulse voltammetry and cyclic voltammetry demonstrate a linear correlation between analyte concentration and the electrochemical *** studies support the spontaneous adsorption of CC and HQ molecules on model WO_(3) *** proposed sensor shows high sensitivity,a wide linear range,and a low detection limit for both individual and simultaneous determination of CC and *** sample analysis on river water confirms practical *** WO_(3)-decorated PI electrode presents an efficient and reliable approach for detecting these pollutants,contributing to environmental safety measures.

关键词： catechol flexible sensor hydroquinone mesoporousWO_(3) simultaneous determination

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Solid-State Hydrogen Storage Properties of Ti-V-Nb-Cr High-Entropy Alloys and the Associated Effects of Transitional Metals(M=Mn,Fe,Ni)

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1113-1122页

作者： Bo Cheng Yunkai Li Xiaoxi Li Huibin Ke Liang Wang Tangqing Cao Di Wan Benpeng Wang Yunfei Xue Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491TrondheimNorway

Recently,high-entropy alloys(HEAs)designed by the concepts of unique entropy-stabilized mechanisms,started to attract widespread interests for their hydrogen storage *** with body-centered cubic(BCC)structures present a high potential for hydrogen storage due to the high hydrogen-to-metal ratio(up to H/M=2)and vastness of *** many studies reported rapid absorption kinetics,the investigation of hydrogen desorption is missing,especially in BCC *** have investigated the crystal structure,microstructure and hydrogen storage performance of a series of HEAs in the Ti-V-Nb-Cr *** types of TiVCrNb HEAs(Ti_(4)V_(3)NbCr_(2),Ti_(3)V_(3)Nb2Cr_(2),Ti_(2)V_(3)Nb_(3)Cr_(2))with close atomic radii and different valence electron concentrations(VECs)were designed with single BCC phase by CALPHAD *** three alloys with fast hydrogen absorption kinetics reach the H/M ratio up to ***,Ti_(4)V_(3)NbCr_(2)alloy shows the hydrogen storage capacity of 3.7 wt%,higher than other HEAs ever *** dehydrogenation activation energy of HEAs’hydride has been proved to decrease with decreasing VEC,which may be due to the weakening of alloy atom and H ***,Ti_(4)V_(3)NbCr_(2)M(M=Mn,Fe,Ni)alloys were also synthesized to destabilize *** addition of Mn,Fe and Ni lead to precipitation of Laves phase,however,the kinetics did not improve further because of their own excellent hydrogen *** increasing the content of Laves phase,there appear more pathways for hydrogen desorption so that the hydrides are more easily dissociated,which may provide new insights into how to achieve hydrogen desorption in BCC HEAs at room temperature.

关键词： High-entropy alloy Hydrogen storage CALPHAD Hydride stability Hydrogen sorption kinetics

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Additive manufacturing of tungsten,tungsten-based alloys,and tungsten matrix composites

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Tungsten 2023年第1期5卷 1-31页

作者： Shuai-Hang Pan Gong-Cheng Yao Yi-Nan Cui Fan-Shi Meng Chuan Luo Tian-Qi Zheng Gurminder Singh Department of Mechanical Engineering University of UtahSalt Lake CityUT 84112USA University of California-Los Angeles Los AngelesCA 90095USA Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China University of Grenoble Alpes CNRSGrenoble INPSIMaP38000 GrenobleFrance Department of Civil and Systems Engineering Johns Hopkins University3400 N.Charles StreetBaltimoreMD 21218USA Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Mechanical and Materials Engineering University College DublinDublin 4Ireland Department of Mechanical Engineering Indian Institute of Technology BombayMumbai 400076India

Tungsten(W) materials are gaining more and more attention due to the extended applications of metallic systems in the extreme *** W’s unique characteristics like room-temperature brittleness,additive manufacturing(AM)techniques could give them a higher design flexibility and *** the growing focus and thriving development of W-faced AM techniques,since the mechanical performance of additively manufactured W parts is still unsatisfactory,a critical review to further explore the possibilities of combining W and AM processes is urgently *** this review,we systematically explain the fundamentals of AM processes for W *** the traditional classification,we further discuss the widely used AM processes including wire arc additive manufacturing(WAAM),electron beam melting(EBM),laser powder bed fusion(LPBF),laser direct energy deposition(laser DED),and other modified yet emergent AM ***,since additively manufacturing W materials is processing parameter-sensitive,we illustrated the effects of various important processing parameters on the AM process control and final parts’ *** this detailed understanding,various categories of AM-compatible W materials(i.e.,pure W,W alloys,and W composites) were presented,and their general mechanical performance,distinct role(particularly the role of different alloying elements and added secondary-phase particles in W),and application-oriented benefits have been *** clarifying the current status,main challenges,and triumphant successes for additively manufacturing W materials,we further provide a concise prospect into the development of additively manufactured(AMed) W materials by integrating potential fabrication,measurement,alloy design,and application’s *** summary,this critical review investigates the fundamental and practical problems crucially limiting the applications of AMed W materials,and the comprehensive discussion concentr

关键词： Tungsten Additive manufacturing Alloy design Composite design Cracking mechanical properties

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DYNAMIC RESPONSES OF A GRAVITY-TYPE FISH CAGE DURING LIFTING OPERATIONS IN WAVES AND CURRENT 43

DYNAMIC RESPONSES OF A GRAVITY-TYPE FISH CAGE DURING LIFTING...

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ASME 2024 43rd International Conference on Ocean, Offshore and Arctic engineering, OMAE 2024

作者： Wen, Xueliang Ong, Muk Chen Cheng, Hui Department of Mechanical and Structural Engineering and Materials Science University of Stavanger StavangerNO-4036 Norway AKVA GROUP ASA Bergen5059 Norway

ISBN: (纸本)9780791887820

Aquaculture has experienced remarkable growth over the past four decades. The utilization of fish cage systems at sea has played a pivotal role in promoting the growth of seafood production. As technology advances, the gravity-type fish cages become more and more popular because of the low capital cost for the industrial-scaled fish farming. The lifting operation of gravity-type fish cages is an important procedure for the harvest and de-lice of the fish. In the present study, the static and dynamic responses of the fish cage before and during the lifting operation are investigated numerically. A Morison model is adopted to calculate the hydrodynamic forces acting on the net ropes of the aquaculture nets and a screen model is used to calculate the hydrodynamic forces acting on the net twines of the aquaculture net. The irregular waves are generated using the JONSWAP wave spectrum. The structure of the aquaculture nets is modelled using an extended position-based dynamics (XPBD) method, which was first used in the cloth dynamics simulations in games. The proposed method is effectively validated against the published experiment data to ensure its accuracy and reliability. The static response of the gravity-type fish cage at various current speeds, and the dynamic responses of the fish cage in irregular waves before and during the lifting operation are analyzed. Results show that in a smooth sea state, the drag force of the fish cage is slightly higher than that in a uniform flow with the same current speed and the fish cage volume sightly decreases, while the deformation of the fish cage is similar. During the lifting operation, the lifting force mainly results from the weight of the sinkers at the bottom of the side net. The maximum tension of the net is located at the net ropes connected to the centre point of the bottom net. Therefore, the structure of the bottom net should be enhanced for safety lifting operations. © 2024 by ASME.

关键词： Rope

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Achieving rapid actuation in liquid crystal elastomers

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National science Open 2025年第2期4卷 60-82页

作者： Changyue Liu Liuchao Jin Wei-Hsin Liao Zhijian Wang Qiguang He Tianmushan Laboratory Hangzhou 310023China Key Laboratory of Aerospace Advanced Materials and Performance Ministry of EducationSchool of Materials Science and EngineeringBeihang UniversityBeijing 100191China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina

Liquid crystal elastomer(LCE)is one kind of soft actuating material capable of producing large and reversible actuation strain,versatile and programmable actuation modes,and high work density,which can be widely exploited for next-generation soft ***,the slow response speed and low power density in LCE-based actuators remain a challenge,limiting their practical *** have been considering how to improve these *** this review,we discuss the fundamentals of the LCEs and emphasize the fast actuation strategies developed in recent ***,we introduce conventional preparation ***,we describe typical actuation mechanisms of LCEs,discussing their features and ***,we summarize several possible approaches as case studies to enhance the actuation performance of LCEs,including reducing physical sizes,introducing active heating-cooling mechanisms,utilizing mechanical instability,and developing dielectric ***,we discuss the future research opportunities and challenges for rapid actuation of LCEs.

关键词： liquid crystal elastomer soft robotics rapid actuation

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Advancements in Titanium for Biomedical Applications: A Review of Recent Developments 2

Advancements in Titanium for Biomedical Applications: A Revi...

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2nd International Conference on Multidisciplinary engineering and Applied science, ICMEAS 2023

作者： Adeleke, Adekunle A. Ikubanni, Peter P. Lawal, Mohammed S. Ogedengbe, Temitayo Anosike-Francis, Esther Suleiman, Suleiman-Abba Daniel, Favour Chika Orhadahwe, Thomas Aghogho Odusote, Jamiu Kolawole Nile University of Nigeria Department of Mechanical Engineering Abuja Nigeria Landmark University Department of Mechanical Engineering Omu-Aran Nigeria Air Force Institute of Technology Department of Mechanical Engineering Kaduna Nigeria African University of Science and Technology Department of Mechanical Engineering Abuja Nigeria Ajayi Crowther University Department of Mechanical Engineering Oyo Nigeria University of Ilorin Department of Materials and Metallurgical Engineering Ilorin Nigeria

ISBN: (纸本)9798350358834

Titanium is an inorganic metallic element that has gained significant importance in various fields due to its exceptional biocompatibility, corrosion resistance, high strength-to-weight ratio, and low modulus of elasticity. These properties have made it a crucial material for improving the quality and durability of life. The chemical and physical characteristics of this element have demonstrated dependability and suitability in the fabrication of mechanical components and constructions that can be implanted within the human body. It has been demonstrated to be a viable option for the fabrication of medical instruments and equipment, particularly those utilised in surgical procedures. This review aims to provide an overview of the latest advancements in the utilization of titanium for biomedical purposes, while also emphasising the distinctive characteristics of titanium that render it an ideal material for medical equipment. © 2023 IEEE.

关键词： Biocompatibility

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High piezoelectricity after field cooling AC poling in temperature stable ternary single crystals manufactured by continuous-feeding Bridgman method

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Journal of Advanced Ceramics 2022年第1期11卷 57-65页

作者： Cong LUO Tomoaki KARAKI Zhuangkai WANG Yiqin SUN Yohachi(John)YAMASHITA Jiayue XU School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Electrical and Computer Engineering Faculty of EngineeringToyama Prefectural UniversityToyama 939-0398Japan Department of Mechanical&Aerospace Engineering North Carolina State UniversityNC 27695-7910USA

After field cooling(FC)alternating current poling(ACP),we investigated the dielectric and piezoelectric properties of[001]_(pc)-oriented 0.24Pb(In_(1/2)Nb_(1/2))O_(3)(PIN)-0.46Pb(Mg_(1/3)Nb_(2/3))O_(3)(PMN)-0.30PbTiO3(PT)(PIMN-0.30PT)single crystals(SCs),which were manufactured by continuous-feeding Bridgman(CF BM)within morphotropic phase boundary(MPB)*** ACP with 4 kVrms/cm from 100 to 70℃,the PIMN-0.30PT SC attained high dielectric permittivity of 8330,piezoelectric coefficient(d_(33))of 2750 pC/N,bar mode electromechanical coupling factorκ_(33)of 0.96 with higher phase change temperature(T_(pc))of 103℃,and high Curie temperature(7c)of 180℃.These values are the highest ever reported as PIMN-xPT SC system with Tpc>100℃.The enhancement of these properties is attributed to the induced low symmetry multi-phase supported by phase *** work indicates that FC ACP is a smart and promising method to enhance piezoelectric properties of relaxor-PT ferroelectric SCs including PIMN-xPT,and provides a route to a wide range of piezoelectric device applications.

关键词： field cooling(FC)alternating current poling(ACP) PIMN-0.30PT high piezoelectricity

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Fragmentation of fuel pellets during transport via a belt conveyor:A design of experiment study

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Particuology 2022年第7期20卷 29-37页

作者： Hamid Gilvari Coen H.H.van Battum Richard Farnish Yusong Pang Wiebren de Jong Dingena L.Schott Section of Transport Engineering and Logistics Department of Maritime&Transport TechnologyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands Wolfson Centre for Bulk Solids Handling Technology Faculty of Engineering&ScienceUniversity of GreenwichUnited Kingdom Section of Large Scale Energy Storage(LSE) Department of Process&EnergyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands

This work investigates the proportion of generated fines in a pilot-scale experiment using a belt conveyor and commercial fuel *** this,a belt conveyor with a length of 3.1 m was used and operated at varying conditions:speeds,percentages of material loading on the belt,two combinations of the inclination angle of the belt and the falling height,and a different number of handling *** considered a design of experiments approach based on response surface methodology to investigate the effect of different conditions on the potential of fines ***,a comparison between the results of the belt conveyor and three common benchmark experimental approaches(tumbling box,rotary impact tester,and mechanical compression test)was *** show that the number of handling steps and the combined effect of drop height and inclination angle directly affected the fines ***,the tested belt speed range and the level of loading were of lower significance.A polynomial quadratic model was derived based on the regression analysis and showed a high accuracy to predict the proportion of ***,the tumbling box method showed good potential to predict the proportion of fines in a belt conveyor when transported several times.

关键词： Fuel pellets Breakage Belt conveyor Transport Design of experiment Box–Behnken design

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Impact of grain boundary energy anisotropy on grain growth

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Physical Review materials 2024年第9期8卷 093403页

作者： S. Kiana Naghibzadeh Zipeng Xu David Kinderlehrer Robert Suter Kaushik Dayal Gregory S. Rohrer Department of Civil and Environmental Engineering Department of Materials Science and Engineering Center for Nonlinear Analysis Department of Mathematical Sciences Department of Physics Department of Mechanical Engineering

A threshold dynamics model of grain growth that accounts for the anisotropy in the grain boundary energy has been used to simulate experimentally observed grain growth of polycrystalline Ni. The simulation reproduces several aspects of the observed microstructural evolution that are not found in the results of simulations assuming isotropic properties. For example, the relative areas of the lowest-energy twin boundaries increase as the grains grow and the average grain boundary energy decreases with grain growth. This decrease in energy occurs because the population of higher-energy grain boundaries decreases while the population of lower-energy boundaries increases as the total grain boundary area decreases. This phenomenon emerges from the assumption of anisotropic grain boundary energies without modification of the energy minimizing algorithm. These findings are consistent with the observation that, in addition to the decrease in grain boundary area, additional energy is dissipated during grain growth by a decrease in the average grain boundary energy.

关键词： Grain boundaries Microstructure Polycrystals Polycrystalline materials

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