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Superior comprehensive properties of LaFe_(11.8)Si_(1.2)/Ce_(60)Co_(40) magnetocaloric composites

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Journal of Rare Earths 2024年第6期42卷 1073-1086,I0003页

作者： Xichun Zhong Yuanxin Li Yucai Wu Jiaohong Huang Cuilan Liu Jian Liu Zhongwu Liu Minglong Zhong Zhenchen Zhong R.V.Ramanujan School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Baotou research Institute of Rare Earths Baotou014030China Center for Advanced Solidification Technology School of Materials Science and EngineeringShanghai UniversityShanghai200444China Jiangxi KeyLaboratory for Rare Earth Magnetic Materials and Devices&Institute for Rare Earth Magnetic Materials and Devices(IREMMD) Jiangxi University of Science and TechnologyGanzhou341000China School of Materials Science and Engineering Nanyang Technological University639798Singapore singapore-huj alliance for research and Enterprise(SHARE) The Smart Grippers for Soft Robotics(SGSR)ProgrammeCampus for Research Excellence and Technological Enterprise(CREATE)138602Singapor

LaFe_(11.8)Si_(1.2)/10 wt%Ce_(60)Co_(40) composites were prepared by spark plasma sintering and subsequent diffusion annealing.A novel core-shell structure is observed with the LaFe11.8Si1.2 particles as the core and the(La,Ce)_(2)(Fe,Co,Si)_(17)(2:17)phase as the *** diffusion annealing time(t_(a))increases,this core-shell structure is replaced by the formation of the(La,Ce)_(1)(Fe,Co,Si)_(13) *** at 1323 K for 12 h results in samples with(-ΔSM)^(max) of 9.30 J/(kg·K)(Δμ0H=2 T),good mechanical properties((σbc)^(max)=402 MPa,ε=4.21%)and thermal conductivity of 8.7 W/(m·K).Thus,bulk composites with excellent comprehensive properties for magnetic refrigeration are obtained in this work.

关键词： LaFe_(11.8)Si_(1.2)/Ce_(60)Co_(40)composites Spark plasma sintering Diffusion annealing Microstructure evolution Magnetocaloric effect Rareearths

Catalytically altering the redox pathway of sulfur in propylene carbonate electrolyte using dual-nitrogen/oxygen-containing carbon

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Chinese Journal of Catalysis 2024年第8期63卷 224-233页

作者： Linghui Yu Heng Zhang Luyuan Paul Wang Samuel Jun Hoong Ong Shibo Xi Bo Chen Rui Guo Ting Wang Yonghua Du Wei Chen Ovadia Lev Zhichuan J.Xu School of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200HubeiChina School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Hubei Key Laboratory of Biomass Fibers&Eco-Dyeing&Finishing Wuhan Textile UniversityWuhan 430200HubeiChina Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research in Singapore(A*STAR)1 Pesek RoadJurong Island 627833Singapore Department of Chemistry National University of SingaporeSingapore 117543Singapore College of the Environment&Ecology Xiamen UniversityXiamen 361102FujianChina National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA The Institute of Chemistry The Hebrew University of JerusalemJerusalem 9190401Israel singapore-huj alliance for research and Enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore138602Singapore Energy research Institute@NTU ERI@NInterdisciplinary Graduate SchoolNanyang Technological UniversitySingapore 639798Singapore

Carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion *** low-polysulfide-solubility feature of some carbonate solvents also makes them very promising for overcoming the shuttle effects of ***,regular sulfur electrodes experience undesired electrochemical mechanisms in carbonate electrolytes due to side *** this study,we report a catalytic redox mechanism of sulfur in propylene carbonate(PC)electrolyte based on a compari-son *** catalytic mechanism is characterized by the interactions between polysulfides and dual N/O functional groups on the host carbon,which largely prevents side reactions between pol-ysulfides and the carbonate *** a mechanism coupled with the low-polysulfide-solubility feature leads to stable cycling of LSBs in PC *** dual N/O functional groups are identified via a density functional theory *** work provides an alternative route for enabling LSBs in carbonate electrolytes.

关键词： Energy storage Lithium-sulfur battery Catalytic redox reaction Porous carbon Carbonate electrolyte

Evaluating different levels of information on the calibration of building energy simulation models

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Building Simulation 2024年第4期17卷 657-676页

作者： Siyu Cheng Zeynep Duygu Tekler Hongyuan Ji Wenxin Li Adrian Chong Department of the Built Environment College of Design and EngineeringNational University of Singapore4 Architecture DriveSingapore117566Singapore School of Civil Engineering and Architecture Chongqing University of Science and TechnologyChongqing401331China School of Energy and Environment Southeast UniversityNanjing210096China

A poorly calibrated model undermines confidence in the effectiveness of building energy simulation, impeding the widespread application of advanced energy conservation measures (ECMs). Striking a balance between information-gathering efforts and achieving sufficient model credibility is crucial but often obscured by ambiguities. To address this gap, we model and calibrate a test bed with different levels of information (LOI). Beginning with an initial model based on building geometry (LOI 1), we progressively introduce additional information, including nameplate information (LOI 2), envelope conductivity (LOI 3), zone infiltration rate (LOI 4), AHU fan power (LOI 5), and HVAC data (LOI 6). The models are evaluated for accuracy, consistency, and the robustness of their predictions. Our results indicate that adding more information for calibration leads to improved data fit. However, this improvement is not uniform across all observed outputs due to identifiability issues. Furthermore, for energy-saving analysis, adding more information can significantly affect the projected energy savings by up to two times. Nevertheless, for ECM ranking, models that did not meet ASHRAE 14 accuracy thresholds can yield correct retrofit decisions. These findings underscore equifinality in modeling complex building systems. Clearly, predictive accuracy is not synonymous with model credibility. Therefore, to balance efforts in information-gathering and model reliability, it is crucial to (1) determine the minimum level of information required for calibration compatible with its intended purpose and (2) calibrate models with information closely linked to all outputs of interest, particularly when simultaneous accuracy for multiple outputs is necessary.

关键词： calibration building energy simulation(BES) energy conservation measure(ECM) level of information field measurements

The possible implications of magnetic field effect on understanding the reactant of water splitting

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Chinese Journal of Catalysis 2022年第1期43卷 148-157页

作者： Chao Wei Zhichuan J.Xu School of Materials Science and Engineering Nanyang Technological UniversitySingapore Energy research Institute Nanyang Technological UniversitySingapore singapore‐huj alliance for research and Enterprise NEW‐CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore

Electrochemical water splitting consists of two elementary reactions i.e.,hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Developing robust HER and OER technologies necessitates a molecular picture of reaction mechanism,yet the reactants for water splitting reactions are unfortunately not fully *** we utilize magnetic field to understand proton transport in HER,and hydroxide ion transport in OER,to discuss the possible implications on understanding the reactants for HER and *** field is a known tool for changing the movement of charged species like ions,*** magnetic‐field‐improved Cu^(2+)transportation near the electrode in Cu ***,applying a magnetic field does not affect the HER or OER rate across various pH,which challenges the traditional opinion that charged species(*** and hydroxide ion)act as the *** anomalous response of HER and OER to magnetic field,and the fact that the transport of proton and hydroxide ion follow Grotthuss mechanism,collectively indicate water may act as the universal reactant for HER and OER across various *** the aid of magnetic field,this work serves as an understanding of water might be the reactant in HER and OER,and possibly in other electrocatalysis reactions involving protonation and deprotonation step.A model that simply focuses on the charged species but overlooking the complexity of the whole electrolyte phase where water is the dominant species,may not reasonably reflect the electrochemistry of HER and OER in aqueous electrolyte.

关键词： Electrocatalysis Water splitting Magnetic field Lorenz force Metal deposition

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Encapsulation of MnS Nanocrystals into N,S-Co-doped Carbon as Anode Material for Full Cell Sodium-Ion Capacitors

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Nano-Micro Letters 2020年第3期12卷 55-68页

作者： Shaohui Li Jingwei Chen Jiaqing Xiong Xuefei Gong Jinghao Ciou Pooi See Lee School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore singapore-huj alliance for research and Enterprise(SHARE) Nanomaterials for Energy and Water Nexus(NEW)Campus for Research Excellence and Technological Enterprise(CREATE)1 Create waySingapore 138602Singapore

Sodium-ion capacitors(SICs)have received increasing interest for grid stationary energy storage application due to their affordability,high power,and energy *** major challenge for SICs is to overcome the kinetics imbalance between faradaic anode and nonfaradaic *** boost the Na+reaction kinetics,the present work demonstrated a high-rate MnS-based anode by embedding the MnS nanocrystals into the N,S-co-doped carbon matrix(MnS@NSC).Benefiting from the fast pseudocapacitive Na+storage behavior,the resulting composite exhibits extraordinary rate capability(205.6 mAh g−1 at 10 A g−1)and outstanding cycling stability without notable degradation after 2000 cycles.A prototype SIC was demonstrated using MnS@NSC anode and N-doped porous carbon(NC)cathode;the obtained hybrid SIC device can display a high energy density of 139.8 Wh kg−1 and high power density of 11,500 W kg−1,as well as excellent cyclability with 84.5%capacitance retention after 3000 *** superior electrochemical performance is contributed to downsizing of MnS and encapsulation of conductive N,S-co-doped carbon matrix,which not only promote the Na+and electrons transport,but also buffer the volume variations and maintain the structure integrity during Na+insertion/extraction,enabling its comparable fast reaction kinetics and cyclability with NC cathode.

关键词： Sodium-ion capacitor Nanocrystal Co-doped carbon Pseudocapacitive control behavior

Electrodeposited Sulfur and CoxS Electrocatalyst on Buckypaper as High-Performance Cathode for Li-S Batteries

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Nano-Micro Letters 2020年第10期12卷 263-275页

作者： Yi Zhan Andrea Buffa Linghui Yu Zhichuan JXu Daniel Mandler School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Chemistry The Hebrew University of Jerusalem9190401 JerusalemIsrael Campus for research Excellence and Technological Enterprise(CREATE) Singapore-HUJ Alliance for Research and Enterprise(SHARE)Singapore 138602Singapore

Lithium-sulfur batteries(LSBs)are considered as the next generation of advanced rechargeable batteries because of their high energy *** this study,sulfur and CoxS electrocatalyst are deposited on carbon nanotube buckypaper(S/CoxS/BP)by a facile electrodeposition method and are used as a binder-free high-performance cathode for *** sulfur is deposited on buckypaper by electrooxidation of a polysulfide solution(-S6^2-).This approach substantially increased the current and time efficiency of sulfur electrochemical deposition on conductive material for LSBs.S/CoxS/BP cathode could deliver an initial discharge capacity as high as 1650 mAh g^-1 at 0.1 C,which is close to the theoretical capacity of *** current rate of 0.5 C,the S/CoxS/BP has a capacity of 1420 mAh g^-1 at the first cycle and 715 mAh g^-1 after 500 cycles with a fading rate of 0.099%per *** high capacity of S/CoxS/BP is attributed to both the homogeneous dispersion of nanosized sulfur within BP and the presence of CoxS *** sodium dodecyl sulfate(SDS)pretreatment of BP renders it polarity to bind polysulfides and thus facilitates the good dispersibility of nanosized sulfur within *** catalyst accelerates the kinetics of polysulfide conversion and reduces the presence of polysulfide in the cathode,which suppresses the polysulfide diffusion to anode,i.e.,the shuttle *** mitigation of the active material loss improves not only the capacity but also the cyclability of S/CoxS/BP.

关键词： Electrodeposition Lithium sulfur batteries Buckypaper Electrocatalysts

Sustainable wearable energy storage devices self-charged by human-body bioenergy

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SusMat 2021年第2期1卷 285-302页

作者： Jian Lv Jian Chen Pooi See Lee School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore singapore-huj alliance for research and Enterprise(SHARE) Nanomaterials for Energy and Energy Water Nexus(NEW)Campus for Research Excellence and Technological EnterpriseSingaporeSingapore

Charging wearable energy storage devices with bioenergy from human-bodymotions, biofluids, and body heat holds great potential to construct self-powered body-worn electronics, especially considering the ceaseless nature ofhuman metabolic activities. To bridge the gap between human-body bioen-ergy and storage of energy, wearable triboelectric/piezoelectric nanogenerators(TENGs/PENGs), biofuel cells (BFCs), thermoelectric generators (TEGs) havebeen designed to harvest energy from body-motions, biofluids, and body heat,respectively. researchers have explored various strategies using bioenergy har-vesters to charge wearable supercapacitors and batteries to relieve or even fullyeliminate the recharging process from external power stations, thus, makingwearable electronics more sustainable, autonomous, and user friendly. In thisarticle, we review the advances in the design of sustainable energy storagedevices charged by human-body energy harvesters. The progress in multifunc-tional wearable energy storage devices that cater to the easy integration withhuman-body energy harvesters will be summarized. Then, the focus is laid onthe integrating strategies (single-cell strategy and separated-cell strategy), devicedesign, materials selection, and characteristics of different self-charging human-body energy harvesting-storage systems. Finally, the challenges that impedethe wide application of human-body energy harvesters charged supercapaci-tors/batteries and prospects will be discussed both from materials and structuraldesign aspects.

关键词： human-body bioenergy self-charging sustainable wearable energy storage devices

Islands of misfit buildings: Detecting uncharacteristic electricity use behavior using load shape clustering

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Building Simulation 2021年第1期14卷 119-130页

作者： Matias Quintana Pandarasamy Arjunan Clayton Miller National University of singapore SingaporeSingapore Berkeley Education alliance for research in singapore(BEARS) SingaporeSingapore

Many energy performance analysis methodologies assign buildings a descriptive label that represents their main activity,often known as the primary space usage(PSU).This attribute comes from the intent of the design team based on assumptions of how the majority of the spaces in the building will be *** reality,the way a building’s occupants use the spaces can be different than what was *** the recent growth of hourly electricity meter data from the built environment,there is the opportunity to create unsupervised methods to analyze electricity consumption behavior to understand whether the PSU assigned is *** or oversimplification of the use of the building is possible using these labels when applied to simulation inputs or benchmarking *** work towards accurate characterization of a building’s utilization,we propose a modular methodology for identifying potentially mislabeled buildings using distance-based clustering analysis based on hourly electricity consumption *** method seeks to segment buildings according to their daily behavior and predict which ones are misfits according to their assigned PSU *** process finds potentially uncharacteristic behavior that could be an indication of mixed-use or a misclassified *** results on two public data sets,from the Building Data Genome(BDG)Project and Washington DC(DGS),with 507 and 322 buildings respectively,show that 26%and 33%of these buildings are potentially mislabelled based on their load shape *** information provides a more realistic insight into their true consumption characteristics,enabling more accurate simulation *** of this process and a discussion of limitations and reproducibility are included.

关键词： uncharasteristic behaviour building energy use building energy benchmarking building performance rating primary-use-type analysis load profile clustering

A Flexible and Lightweight Biomass-Reinforced Microwave Absorber

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Nano-Micro Letters 2020年第10期12卷 1-15页

作者： Yan Cheng Justin Zhu Yeow Seow Huanqin Zhao Zhichuan JXu Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore singapore-huj alliance for research and Enterprise NEW-CREATE PhaseⅡCampus for Research Excellence and Technological Enterprise(CREATE)Singapore 138602Singapore

Developing a flexible,light-weight and effective electromagnetic(EM)absorber remains challenging despite being on increasing demand as more wearable devices and portable electronics are ***,we report a flexible and lightweight hybrid paper by a facile vacuumfiltration-induced self-assembly process,in which cotton-derived carbon fibers serve as flexible skeletons,compactly surrounded by other microwave-attenuating components(reduced graphene oxide and Fe3O4@C nanowires).Owing to its unique architecture and synergy of the three components,the asprepared hybrid paper exhibits flexible and lightweight features as well as superb microwave absorption *** absorption intensity with reflection loss as low as-63 dB can be achieved,and its broadest frequency absorption bandwidth of 5.8 GHz almost covers the entire Ku *** a hybrid paper is promising to cope with ever-increasing EM *** work also paves the way to develop low-cost and flexible EM wave absorber from biomass through a facile method.

关键词： Flexible Biomass Microwave absorption Dielectric loss Magnetic loss