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Phase-transition-free rivets for layered oxide potassium cathodes

Nano Research 2024年第11期17卷 9671-9678页

作者： Jie Chen Apparao M. Rao Caitian Gao Jiang Zhou Limei Cha Xiaoming Yuan Bingan Lu School of Physics and Electronics Hunan University Changsha 410082 China Department of Physics and Astronomy Clemson Nanomaterials Institute Clemson University Clemson SC USA School of Materials Science and Engineering Central South University Changsha 410083 China Materials Science and Engineering program Guangdong Technion-Israel Institute of Technology Shantou 515063 China Materials Science and Engineering program Technion-Israel Institute of Technology Haifa 32000 Israel MATEC Key Lab Guangdong Technion-Israel Institute of Technology Shantou 515063 China Hunan Key Laboratory of Nanophotonics and Devices School of Physics Central South University Changsha 410078 China

As a cathode material for potassium-ion batteries (PIBs), manganese-based layered oxides have attracted widespread attention due to their low cost, ease of synthesis, and high performance. However, the Jahn-Teller effect caused by Mn3+ and the irreversible phase transformation of the structure leads to poor cycle stability, limiting the development of layered oxides in PIBs. Herein, we demonstrate the use of phase-transition-free CaTiO_(3) as rivets in K_(0.5)Mn_(0.9)Ti_(0.1)O_(2) by a simple solid-state method. As verified by the in situ X-ray diffraction, the CaTiO_(3) rivets effectively prevent the slippage of the transition metal layer during charge and discharge, inhibiting structural degradation. As a result, the obtained K_(0.5)Mn_(0.9)Ti_(0.1)O_(2)-0.02CaTiO_(3) shows excellent cycling stability and rate performance, with high capacities of 119.3 and 70.1 mAh·g^(-1) at 20 and 1000 mA·g^(-1), respectively. At 200 mA·g^(-1), the capacity retention remains 94.7% after more than 300 cycles. This work represents a new avenue for designing and optimizing layered cathode materials for PIBs and other batteries.

关键词： potassium cathodes layered oxide phase-transition-free perovskite rivets

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Dual modifications of sensitizers and lanthanide ions on a two-dimensional zirconium-based metal-organic framework for photoluminescent detection

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CrystEngComm 2024年第22期26卷 2852-2861页

作者： Chang, Jhe-Wei Lin, Tzu-Chi Chen, You-Liang Han, Po-Chun Yang, Shang-Cheng Tsai, Meng-Dian Wu, Kevin C.-W. Kung, Chung-Wei Department of Chemical Engineering National Cheng Kung University Tainan City70101 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Ph. D. Program of Green Materials and Precision Devices College of Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan320 Taiwan

A two-dimensional (2D) zirconium-based metal-organic framework (Zr-MOF) with abundant terminal -OH/-OH2 groups on its nodes, ZrBTB (BTB = 1,3,5-tris(4-carboxyphenyl)benzene), is utilized as a platform for dual post-synthetic modifications (PSM) to immobilize both the benzophenone-based photosensitizer (benzophenone-4,4′-dicarboxylate, bzpdc) and terbium ions onto the 2D Zr-MOF molecular sheets. Terbium ions are installed on the 2D Zr-MOF at various temperatures to adjust the loading of terbium ions on the 2D Zr-MOF while preserving the loading of the photosensitizer. The crystallinity, morphology, porosity, and loadings of both bzpdc ligands and terbium ions are characterized for each material, and the coordinating locations of terbium ions in the Zr-MOF structure are investigated. The photoluminescence (PL) properties of these materials are then examined. Since the installed bzpdc ligand can induce a highly efficient energy transfer to the neighbouring terbium ion upon excitation, the obtained material after dual PSM (ZrBTB-bzpdc-Tb-120) can show strong PL emissions of terbium ions upon the excitation of the bzpdc ligand at 355 nm, with a PL quantum yield of 5.04%. It is more advantageous than the 2D Zr-MOF solely functionalized with terbium ions, which can only exhibit similar emissions upon the excitation of the BTB linker at a less friendly wavelength of 310 nm, with a lower PL quantum yield of 2.94%. Owing to the high chemical stability as well as good dispersity of the luminescent ZrBTB-bzpdc-Tb-120 in water, its performances in selective PL sensing of Fe(iii) ions present in aqueous solutions are investigated. © 2024 The Royal Society of Chemistry.

关键词： Carboxylation

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Optimized CeO_(2) Nanowires with Rich Surface Oxygen Vacancies Enable Fast Li-Ion Conduction in Composite Polymer Electrolytes

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Energy & Environmental materials 2023年第1期6卷 218-223页

作者： Lu Gao Nan Wu Nanping Deng Zhenchao Li Jianxin Li Yong Che Bowen Cheng Weimin Kang Ruiping Liu Yutao Li State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustin TX 78712USA Department of Materials of Science and Engineering China University of Mining and Technology(Beijing)Beijing 100083China Enpower Energy Corp. Beijing 102600China

Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and ***,both the low room-temperature ionic conductivities and the small Li^(+)transference number of these electrolytes significantly increase the internal resistance and overpotential of the ***,we introduce Gd-doped CeO_(2) nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO_(2) nanowires and polymer electrolytes,which promotes the Li-salt dissociation and increases the concentration of mobile Li ions in the composite polymer *** optimized composite polymer electrolyte has a high Li-ion conductivity of 5×10^(-4)4 S cm^(-1) at 30℃ and a large Li+transference number of ***,the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage LiNi_(0.8)Mn _(0.1)Co_(0.1)O_(2)(NMC)cathode,providing the stable cycling of all-solid-state batteries at high current densities.

关键词： composite polymer electrolytes,Gd-doped CeO_(2)nanowires Li-ion conduction oxygen vacancies surface interaction

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AI-enabled Lorentz microscopy for quantitative imaging of nanoscale magnetic spin textures

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npj Computational materials 2024年第1期10卷 2102-2111页

作者： Arthur.R.C.McCray Tao Zhou Saugat Kandel Amanda Petford-Long Mathew J.Cherukara Charudatta Phatak Materials Science Division Argonne National LaboratoryLemontILUSA Applied Physics Program Northwestern UniversityEvanstonILUSA Center for Nanoscale Materials Argonne National LaboratoryLemontILUSA Advanced Photon Source Argonne National LaboratoryLemontILUSA Department of Materials Science and Engineering Northwestern UniversityEvanstonILUSA

The manipulation and control of nanoscale magnetic spin textures are of rising interest as they are potential foundational units in next-generation computing *** this requires a quantitative understanding of the spin texture behavior under external stimuli using in situ *** transmission electron microscopy(LTEM)enables real-space imaging of spin textures at the nanoscale,but quantitative characterization of in situ data is extremely ***,we present an AI-enabled phase-retrieval method based on integrating a generative deep image prior with an image formation forwardmodel for *** approach uses a single out-of-focus image for phase retrieval and achieves significantly higher accuracy and robustness to noise compared to existing ***,our method is capable of isolating sample heterogeneities from magnetic contrast,as shown by application to simulated and experimental *** approach allows quantitative phase reconstruction of in situ data and can also enable near real-time quantitative magnetic imaging.

关键词： textures magnetic Lorentz

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Crafting chirality in three dimensions via a novel fabrication technique for bound states in the continuum metasurfaces

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Light(science & Applications) 2024年第3期13卷 390-392页

作者： Zaid Haddadin Anna My Nguyen Lisa V.Poulikakos Department of Electrical&Computer Engineering University of California San DiegoLa JollaCAUSA Department of Mechanical&Aerospace Engineering University of California San DiegoLa JollaCAUSA Program of Materials Science&Engineering University of California San DiegoLa JollaCAUSA

An additional deposition step was added to a multi-step electron beam lithographic fabrication process to unlock the height dimension as an accessible parameter for resonators comprising unit cells of quasi-bound stat... 详细信息

关键词： dimensions dimension intrinsic

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Accurate prediction of oxygen vacancy concentration with disordered A-site cations in high-entropy perovskite oxides

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npj Computational materials 2023年第1期9卷 2053-2065页

作者： Jiyun Park Boyuan Xu Jie Pan Dawei Zhang Stephan Lany Xingbo Liu Jian Luo Yue Qi School of Engineering Brown UniversityProvidenceRI 02912USA Department of Physics Brown UniversityProvidenceRI 02912USA Department of Chemical Engineering and Materials Science Michigan State UniversityEast LansingMI 48824USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Materials Science Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Mechanical and Aerospace Engineering Benjamin M.Statler College of Engineering and Mineral ResourcesWest Virginia UniversityMorgantownWV 26506USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA

Entropic stabilized ABO_(3) perovskite oxides promise many applications,including the two-step solar thermochemical hydrogen(STCH)*** binary and quaternary A-site mixed{A}FeO_(3) as a model system,we reveal that as more cation types,especially above four,are mixed on the A-site,the cell lattice becomes more cubic-like but the local Fe–O octahedrons are more *** comparing four different Density Functional Theory-informed statistical models with experiments,we show that the oxygen vacancy formation energies(E^(f)_(V))distribution and the vacancy interactions must be considered to predict the oxygen non-stoichiometry(δ)*** STCH applications,the E^(f)_(V) distribution,including both the average and the spread,can be optimized jointly to improveΔδ(difference ofδbetween the two-step conditions)in some hydrogen production *** model can be used to predict the range of water splitting that can be thermodynamically improved by mixing cations in{A}FeO_(3) perovskites.

关键词： perovskite vacancy oxides

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Improving PEM Hydrogen Electrolyser Efficiency using AC Excitation

Improving PEM Hydrogen Electrolyser Efficiency using AC Exci...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Larsen, Thea Kim, Seho Kennedy, John Liu, Jingjing University of Auckland Department of Electrical Computer and Software Engineering Auckland New Zealand Earth Resources and Materials Geological and Nuclear Science Wellington New Zealand The University of Auckland Department of Chemical and Materials Engineering Auckland New Zealand

ISBN: (纸本)9798350376067

Hydrogen is a potential clean energy source that minimises environmental impacts but is currently economically prohibitive due to the low energy conversion efficiency. In order to improve the economic viability, this paper investigates improving the efficiency of hydrogen electrolysis. The prototype power electronics presented in this paper provide low-frequency AC or pulsed current to a proton exchange membrane (PEM) electrolyser to improve the operational efficiency up to 4.2% in contrast to the typical constant current or voltage excitation. © 2024 IEEE.

关键词： Clean energy

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Porphyrin-Grafted Poly(ethylene terephthalate) as a Reusable and Highly Selective Colorimetric Probe for Mercuric Ion Contaminants in Aqueous Samples

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ACS Applied materials and Interfaces 2024年第30期16卷 39195-39205页

作者： Atayde, Eduardo C. Takenaka, Yasumasa Abe, Hideki Wu, Ming-Rou Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Department of Chemistry National Tsing Hua University Department of Chemical Engineering National Taiwan University Bioplastic Research Team RIKEN Center for Sustainable Resource Science Department of Chemical Engineering and Materials Science Yuan Ze University Department of Chemical Engineering Chung Yuan Christian University

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg2+) ions are known to cause detrimental health issues in both humans and aquatic life. ... 详细信息

Heavy metals are the most hazardous water pollutants, with severe health and environmental consequences. Among these, mercuric (Hg²⁺) ions are known to cause detrimental health issues in both humans and aquatic life. Due to this, several analytical techniques have been devised to detect and quantify the amount of this ion. However, most of these require advanced instrumentation, prolonged analysis time, and sample preparation. In this study, a low-cost and highly reusable colorimetric probe was developed by grafting porphyrin to poly(ethylene terephthalate) sheets using an oxazoline polymer as covalent adhesive. Upon exposure to trace amounts of Hg²⁺ in solution, the fabricated material visually transitioned from faint brownish pink to green by the complexation mechanism. Additionally, the transparency of this probe allowed the quantitative spectrophotometric determination of the Hg²⁺ concentration in aqueous samples. It was also shown that the material is highly stable, which can be reused for more than 50 times without significant decline in its performance, hence, making it suitable for the onsite monitoring of mercuric ion contamination in different bodies of water. © 2024 The Authors. Published by American Chemical Society.

关键词： colorimetric probe mercuric ion oxazoline PET porphyrin

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Recycling of Magnesium Alloy Using the Gravity-Driven Multiple-Effect Thermal System (G-METS)

Recycling of Magnesium Alloy Using the Gravity-Driven Multip...

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Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2024

作者： Mc Arthur Sehar, Daniel Telgerafchi, Armaghan Ehsani Iurkovskyi, Artem Opoku, Emmanuel Powell, Adam Materials Science and Engineering Program Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9783031502392

MagnesiumMagnesium metal has been significantly used in commercial applications from automobiles to aluminum alloys to defense weaponry. The surge in structural usage of magnesium over the past years has been due to high strength and excellent stiffness-to-weight ratio. RecyclingRecycling magnesium scrap is a crucial aspect of the sustainability of the economy and environmental welfare. G-METS is an advanced distillationDistillation system used in the conversion of low-grade magnesium scrap into high-purityHigh-purity magnesium metal. This multiple-effect system uses the weight of magnesiumMagnesium as a compressor, to build pressure differences between each effect of the condenser-evaporator, modifying boiling points, and enabling transfer of vaporization enthalpy. This system is exceptionally efficient compared to the energy-intensive conventional distillationDistillation technique. This study compares experiments and models of one- and two-effect distillers. © The Minerals, Metals & materials Society 2024.

关键词： Magnesium alloys

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Mantle flow underneath the South China Sea revealed by seismic anisotropy

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National science Review 2023年第10期10卷 54-61页

作者： Fansheng Kong Rui Gao Stephen S.Gao Kelly H.Liu Weiwei Ding Xiongwei Niu Aiguo Ruan Pingchuan Tan Jianke Fan Shaoping Lu Zhengyi Tong Liqun Cheng Wenfei Gong Yanghui Zhao Jiabiao Li Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural Resources Southern Marine Science and Engineering Guangdong Laboratory Geology and Geophysics Program Department of Geosciences and Geological and Petroleum Engineering Missouri University of Science and Technology School of Earth Sciences and Engineering Sun Yat-sen University Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences

It has long been established that plastic flow in the asthenosphere interacts constantly with the overlying lithosphere and plays a pivotal role in controlling the occurrence of geohazards such as earthquakes and volcanic ***,accurately characterizing the direction and lateral extents of the mantle flow field is notoriously difficult,especially in oceanic areas where deployment of ocean bottom seismometers(OBSs) is expensive and thus *** this study,by applying shear wave splitting analyses to a dataset recorded by an OBS array that we deployed between mid-2019 and mid-2020 in the South China Sea(SCS),we show that the dominant mantle flow field has a NNW-SSE orientation,which can be attributed to mantle flow extruded from the Tibetan Plateau by the ongoing Indian-Eurasian *** addition,the results suggest that E-W oriented flow fields observed in South China and the Indochina Peninsula do not extend to the central SCS.

关键词： mantle flow South China Sea Tibetan Plateau seismic anisotropy shear wave splitting

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