Journal of Physics-Energy最新文献_第7页

Magnetocaloric properties in (La,R)(Fe,Mn,Si)13H (R = Ce and Pr)—toward a better alloy design that results in a reduction in volume of permanent magnets and the establishment of long-term reliability in cooling systems （La，R）（Fe，Mn，Si）13H（R=Ce和Pr）的磁热性能——朝着更好的合金设计方向发展，从而减少永磁体的体积并建立冷却系统的长期可靠性

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-08-02 DOI: 10.1088/2515-7655/ace930

A. Fujita, K. Imaizumi

引用次数: 0

Spatio-temporal solid-state electrocaloric effect exceeding twice the adiabatic temperature change 时空固态电热效应超过绝热温度变化的两倍

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-27 DOI: 10.1088/2515-7655/aceb1b

Stefan Mönch, K. Bartholomé

{"title":"Spatio-temporal solid-state electrocaloric effect exceeding twice the adiabatic temperature change","authors":"Stefan Mönch, K. Bartholomé","doi":"10.1088/2515-7655/aceb1b","DOIUrl":"https://doi.org/10.1088/2515-7655/aceb1b","url":null,"abstract":"In an all-solid-state electrocaloric arrangement, an absolute temperature change which exceeds twice the electrocaloric adiabatic temperature change is locally realized, using just the distributed thermal capacitances and resistances and spatio-temporal distributed electric field control. First, simulations demonstrate surface temperature changes up to four times (400%) the electrocaloric adiabatic temperature change for several implementations of all-solid state distributed element configurations. Then, experimentally, an all-solid-state assembly is built from commercial electrocaloric capacitors with two independently-controlled parts, and the measured surface temperature change was 223% of the adiabatic electrocaloric temperature change, which clearly exceeds twice the adiabatic temperature change and verifies the practical feasibility of the approach. This allows a significant increase of the maximum temperature difference per stage in cascaded and thermal switch-based electrocaloric heat pumps, which was previously limited by the adiabatic electrocaloric temperature change (100%) under no-load conditions. Distributed thermal element simulations provide insight in the spatio-temporal temperatures within the all-solid-state electrocaloric element. Since only the distributed thermal capacitance and resistance is used to boost the temperature change, the maximum absolute temperature change occurs only in parts of the all-solid-state element, for example close to the surfaces. A trade-off of the approach is that the required electrocaloric capacitance increases more than the gained boost of the absolute temperature change, reducing the power density and electrical efficiency in heat pump systems. Nevertheless, the proposed approach enables to simplify electrocaloric heat pumps or to increasing the achievable temperature span, and might also improve other electrocaloric applications.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":" ","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42193616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic shielding properties of LPBF produced Fe2.9wt.%Si alloy 制备Fe2.9wt的LPBF的电磁屏蔽性能。% Si合金

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-20 DOI: 10.1088/2515-7655/ace92f

M. Quercio, Francesco Galbusera, A. Canova, A. Demir, G. Gruosso, B. Previtali

引用次数: 1

LFP-based binder-free electrodes produced via fused filament fabrication 通过熔融丝制造生产的LFP基无粘合剂电极

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-18 DOI: 10.1088/2515-7655/ace850

José Miguel Ramos-Fajardo, Isabel María Peláez-Tirado, Juan Ramón Marín-Rueda, M. Castro-García, J. Canales‐Vázquez, J. Pérez-Flores

{"title":"LFP-based binder-free electrodes produced via fused filament fabrication","authors":"José Miguel Ramos-Fajardo, Isabel María Peláez-Tirado, Juan Ramón Marín-Rueda, M. Castro-García, J. Canales‐Vázquez, J. Pérez-Flores","doi":"10.1088/2515-7655/ace850","DOIUrl":"https://doi.org/10.1088/2515-7655/ace850","url":null,"abstract":"Carbon coated-LiFePO4 (LFP) is a strong candidate as lithium-ion battery (LiB) cathode due to the combination of safe operation, stable electrochemical performance and positive environmental impact as does not depend on Co, which is toxic and a critical raw material. In this work, we report the development of binder-free LFP cathodes fabricated by fused filament fabrication (FFF) technology. Several novel carbon-LFP filaments have been developed to 3D-print LiB cathodes, analysing both the carbon to LFP ratio in the formulation and also the impact of the carbon source used as current collector, i.e. glassy carbon (GC) microspheres or carbon black (CB), in the electrochemical performance. LFP remained stable upon debinding and sintering at temperatures as low as 500 °C as determined by x-ray diffraction. The conductivity of 3D printed LFP monoliths was 2.06 × 10−4 S∙cm−1 at 50 °C, which is fairly close to that of LFP produced via conventional processing. This is mainly attributed to the preservation of the carbon coating around the LFP particles after debinding and sintering under controlled Ar atmospheres. The LFP-based electrodes containing CB or GC microspheres as conductive additives exhibited specific capacities of 150 mAh g−1, and over 95% coulombic efficiency after 100 cycles, showing no significant performance losses. These results largely exceed the performances reported for previous LFP-based electrodes produced via FFF as the non-active binder is removed upon fabrication.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":" ","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44322936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controlled assembly of perovskite nanoparticles by photoswitchable functional ligands 光开关功能配体控制钙钛矿纳米颗粒组装

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-17 DOI: 10.1088/2515-7655/ace7f5

Tal Binyamin, Orit Cohen, Idan Cohen, L. Etgar

引用次数: 0

On the efficiency of caloric materials in direct comparison with exergetic grades of compressors 热材料效率与压缩机性能等级的直接比较

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-17 DOI: 10.1088/2515-7655/ace7f4

J. Schipper, D. Bach, Stefan Mönch, C. Molin, S. Gebhardt, J. Woellenstein, Olaf Schaefer-Welsen, C. Vogel, R. Langebach, K. Bartholomé

{"title":"On the efficiency of caloric materials in direct comparison with exergetic grades of compressors","authors":"J. Schipper, D. Bach, Stefan Mönch, C. Molin, S. Gebhardt, J. Woellenstein, Olaf Schaefer-Welsen, C. Vogel, R. Langebach, K. Bartholomé","doi":"10.1088/2515-7655/ace7f4","DOIUrl":"https://doi.org/10.1088/2515-7655/ace7f4","url":null,"abstract":"Efficiency improvements in heat pump can drastically reduce global energy demand. Caloric heat pumps are currently being investigated as a potentially more efficient alternative to vapor compression systems. Caloric heat pumps are driven by solid-state materials that exhibit a significant change in temperature when a field is applied, such as a magnetic or an electric field as well as mechanical stress. For most caloric materials, the phase transition results in a certain amount of power dissipation, which drastically impacts the efficiency of a caloric cooling system. The impact on the efficiency can be expressed by a figure of merit (FOM), which can directly be deduced from material properties. This FOM has been derived for 36 different magneto-, elasto-, electro and barocaloric material classes based on literature data. It is found that the best materials can theoretically attain second law efficiencies of over 90%. The FOM is analogous to the isentropic efficiency of idealized compressors of vapor compression systems. The isentropic efficiency can thus be directly linked to the theoretically achievable efficiency of a compressor-based refrigeration system for a given refrigerant. In this work a theoretical comparison is made between efficiency of caloric heat pumps and vapor compression systems based on the material losses for the caloric heat pump and the efficiency of the compressor for vapor compression systems. The effect of heat regeneration is considered in both cases. In vapor compression systems, the effect of the working fluid on the efficiency is also studied.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":"5 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41346678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Elastocaloric effect of shape memory polymers in elastic response regime 弹性响应下形状记忆聚合物的弹热效应

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-17 DOI: 10.1088/2515-7655/ace7f3

T. Hirai, K. Uto, M. Ebara, K. Uchida

{"title":"Elastocaloric effect of shape memory polymers in elastic response regime","authors":"T. Hirai, K. Uto, M. Ebara, K. Uchida","doi":"10.1088/2515-7655/ace7f3","DOIUrl":"https://doi.org/10.1088/2515-7655/ace7f3","url":null,"abstract":"Solid-state cooling/heating technology based on the elastocaloric effect is one of the promising alternatives to vapor compression systems. Large elastocaloric temperature modulation is often generated through the non-linear strain-induced structural transition by applying large strain and/or stress to ferroelastic materials. Recently, an unconventional approach to expand the application possibilities of the elastocaloric effect was demonstrated by processing elastocaloric materials into kirigami structures, which was inspired by the art of paper cutting. Using this approach, only a small stretch of processed conventional plastics can locally provide more efficient performance of elastocaloric temperature modulation than that of ferroelastic materials. To further improve such a unique functionality, it is necessary to find plastic or polymeric materials showing large elastocaloric effects in the linear elastic response regime that can be driven by a MPa-order weak stress application, where the non-linear structural transition is irrelevant. In this work, by means of a recently developed measurement technique for the elastocaloric effect based on the lock-in thermography, we found that shape memory polymers (SMPs) show prominent performance for elastocaloric temperature modulation that is larger than conventional plastics. SMPs enable the control of crystallinity by changing the cross-linking agents, melting temperature by changing the degree of polymerization, and orientation of the polymer chain segment by the shape memory effect. By utilizing the unique properties of SMPs, we manipulated their elastocaloric performance. The experimental results reported here will highlight the potential of smart polymers for flexible and durable elastocaloric applications.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":" ","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42457503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics 磁热器件中热开关电容器的概念设计：特性的实验表征和操作特性的模拟

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-01 DOI: 10.1088/2515-7655/ace288

Nada Petelin, M. Kalin, A. Kitanovski

{"title":"A conceptual design of a thermal switch capacitor in a magnetocaloric device: experimental characterization of properties and simulations of operating characteristics","authors":"Nada Petelin, M. Kalin, A. Kitanovski","doi":"10.1088/2515-7655/ace288","DOIUrl":"https://doi.org/10.1088/2515-7655/ace288","url":null,"abstract":"The quest for better performance from magnetocaloric devices has led to the development of thermal control devices, such as thermal switches, thermal diodes, and thermal capacitors. These devices are capable of controlling the intensity and direction of the heat flowing between the magnetocaloric material and the heat source or heat sink, and therefore have the potential to simultaneously improve the power density and energy efficiency of magnetocaloric systems. We have developed a new type of thermal control device, i.e., a silicon mechanical thermal switch capacitor ( TSC). In this paper we first review recently developed thermal switches based on micro-electromechanical systems and present the operation and structure of our new TSC. Then, the results of the parametric experimental study on the thermal contact resistance, as one of the most important parameters affecting the thermal performance of the device, are presented. These experimental data were later used in a numerical model for a magnetocaloric device with a thermal switch-capacitor. The results of the study show that for a single embodiment, a maximum cooling power density of 970 W m−2 (510 W kgmcm −1) could be achieved for a zero-temperature span and an operating frequency of 5 Hz. However, a larger temperature span could be achieved by cascading multiple magnetocaloric elements with TSCs. We have shown that the compact TSC can be used in caloric devices, even with small temperature variations, and can be used in a variety of practical applications requiring thermal regulation.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":" ","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49325844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance evaluation of a novel synchronously interdigitated/winded lithium-ion battery configuration enabled by 3D printing through numerical simulations 通过数值模拟对3D打印实现的新型同步叉指/卷绕锂离子电池配置的性能评估

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-01 DOI: 10.1088/2515-7655/acdf1d

Yide Li, Jie Li, Zhiyuan Liu, Zhangwei Chen, Changyong Liu

{"title":"Performance evaluation of a novel synchronously interdigitated/winded lithium-ion battery configuration enabled by 3D printing through numerical simulations","authors":"Yide Li, Jie Li, Zhiyuan Liu, Zhangwei Chen, Changyong Liu","doi":"10.1088/2515-7655/acdf1d","DOIUrl":"https://doi.org/10.1088/2515-7655/acdf1d","url":null,"abstract":"Thick electrodes with higher energy density are highly desirable for lithium-ion batteries (LIBs). However, the sluggish transport of Li-ions in thick electrodes is a critical challenge. In this study, a novel synchronously interdigitated/winded battery configuration enabled by 3D printing is proposed. The cathode, separator, and anode are synchronously interdigitated in the core and synchronously winded in the outer-rings to form an integrated full battery. With this novel battery configuration, Li-ions can transport between neighboring cathode and anode, thereby significantly reduce the transport distance of Li-ions, and improve the electrochemical reaction kinetics. To evaluate the electrochemical performance of this battery configuration, this study investigates the effects of various parameters including the electronic conductivity, electrode porosity, electrode line width, separator thickness, and number of winded outer-rings on the electrochemical performance through numerical simulations. Results showed that electronic conductivity is the most crucial factor in determining the electrochemical performance. In combination with multi-material 3D printing, the battery configuration proposed in this study may be utilized to build LIBs with higher energy density.","PeriodicalId":48500,"journal":{"name":"Journal of Physics-Energy","volume":" ","pages":""},"PeriodicalIF":6.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44960893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transforming characterization data into information in the case of perovskite solar cells 在钙钛矿太阳能电池的情况下，将表征数据转换为信息

IF 6.9 3区材料科学

Journal of Physics-Energy Pub Date : 2023-07-01 DOI: 10.1088/2515-7655/ace07b

T. Kirchartz, Basita Das

引用次数: 1