Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology

Waske, Anja; Dzekan, Daniel; Sellschopp, Kai; Berger, Dietmar; Stork, Alexander; Nielsch, Kornelius; Fähler, S.

doi:10.1038/s41560-018-0306-x

Cited by 89 publications

(93 citation statements)

References 15 publications

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“…The first idea of a fully static magnetocaloric refrigerator or a heat pump can be traced back to the patent of Chilowsky in 1952 . By solving the challenge of high and low fields, a fully static magnetocaloric refrigerator can be designed using an electro‐permanent‐magnet assembly, for example, by introducing thermomagnetic power generation . Experimental magnetocaloric prototype devices with a conventional electromagnetic field source exhibit a rather slow magnetization/demagnetization process.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

“…Based on the results of this study, the authors report that the second‐law efficiency was 54%. The most recent work on a fully static magnetocaloric power generator ( Figure 13 ) was reported by Waske et al The authors first studied several different potential configurations of permanent magnets, magnetocaloric materials (La‐Fe‐Co‐Si‐based plate magnetocaloric regenerators), steel yokes, and electrical coils. Based on the numerical results, they chose the best configuration, which was further experimentally validated.…”

Section: Heat‐to‐power Conversion With Magnetocaloric Materialsmentioning

confidence: 99%

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Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

377

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Section: Heat‐to‐power Conversion With Magnetocaloric Materialsmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

377

156

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“…[1][2][3][4] A variety of emerging technologies, such as devices for energy conversion and storage, or for advanced air and water cleaning, are developed to meet the large energy demands and tackle various environmental challenges. [1][2][3][4] A variety of emerging technologies, such as devices for energy conversion and storage, or for advanced air and water cleaning, are developed to meet the large energy demands and tackle various environmental challenges.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

2019

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organic linkers with a periodic, nanoscaled structure and ultrahigh surface areas. With their tunable pore/cage sizes, flexible skeleton, and large surface-to-volume ratio, [13][14][15][16][17][18][19] MOFs have a large potential for a wide range of applications, including gas storage and separation, rechargeable batteries, supercapacitors, solar cells, nanoreactors, heterogeneous catalysis, or drug delivery. [20][21][22][23][24][25][26][27] Recently, significant efforts have been devoted to the design and synthesis of new MOFs structures and the investigation of their physical or chemical properties. MOFs are generally prepared as bulk form through traditional hydrothermal or solvothermal synthesis. [28][29][30][31] In order to expand the application range, suitable pathways for the structuring of MOF powders into a functional architecture or devices are highly desirable.Currently, intensive efforts are focusing on the structuring of MOFs at the mesoscopic/macroscopic scale for the use as coatings, membranes, or sophisticated architectures in specific devices and applications. [32][33][34][35] A major difference in the structuring of MOFs into complex shapes compared to inorganic microporous materials, such as zeolites or silica, is the fact that most inorganic binders cannot be used for MOFs as these binders usually require heat treatment. The intrinsic fragility of MOFs needs to be considered which is related to the inorganic/organic hybrid character of this class of materials and the resulting limited thermal and mechanical stability. Alternatively, a more effective way to structure MOFs is the combination with polymer materials. The polymer which acts as a binder improves the mechanical flexibility and ensures chemical stability. Numerous methods have been developed for structuring MOF-polymer compositions including hard or soft templates, spin-or dip-coating, spray-drying, printing, or lithography approaches. [36][37][38] The integration of MOFs into a polymer matrix can result in poor MOF-polymer dispersion and compatibility issues owing to the different physical and chemical properties for the two kinds of materials and this is a challenge in some applications, e.g., in MOF-based mixed matrix membranes for gas separation. [39][40][41][42] The poor interfacial compatibility would lead to agglomeration of MOF particles, causing the formation of nonselective voids between the MOFs particles and the polymer.Electrospinning is a fabrication method to produce continuous ultrafine fibers with diameters in the range of a few tens of nanometers to a few micrometers in the form of nonwoven mats, yarns, etc. The mechanism of electrospinning is based Herein, recent developments of metal-organic frameworks (MOFs) structured into nanofibers by electrospinning are summarized, including the fabrication, post-treatment via pyrolysis, properties, and use of the resulting MOF nanofiber architectures. The fabrication and post-treatment of the MOF nanofiber architectures are described systematically by two routes: i) the dire...

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“…[19] The energy-conversion capability could be further enhanced if the potentially synergetic multiple energy-conversion mechanisms are used in a cyclic manner. Such cycles are documented to enhance the energy conversion using the pyroelectric effect (the Olsen cycle), [20][21][22][23][24][25] the pyro-magnetic effect, [26][27][28] and mechanical confinement (enhanced electrical output under mechanical stress). [16,29,30] However, the operating ranges of these cycles are constrained due to the involvement of slow thermal, mechanical, and magnetic changes.…”

Section: Introductionmentioning

confidence: 99%

Coalition of Thermo–Opto–Electric Effects in Ferroelectrics for Enhanced Cyclic Multienergy Conversion

et al. 2020

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The concept of multisource energy harvesting (of light, kinetic, and thermal energy) using a single material has recently been proposed. Herein, the realization of this novel concept is discussed and insight into the electric field‐assisted modulation of photocurrent and pyroelectric current in a bandgap‐engineered ferroelectric KNBNNO ((K0.5Na0.5)NbO3‐2 mol% Ba(Ni0.5Nb0.5)O3−δ) is provided. Thereafter, direct current (DC) electrical modulation under the simultaneous inputs of light and thermal changes for photovoltaic and pyroelectric effects, respectively, is utilized to achieve several orders of increase in the output current density. This is attributed to a light‐assisted increase in the material's electrical conductivity and ferroelectric photovoltaic effect. The phenomena of electro–optic and thermo–electro–optic DC modulations are further used to propose two novel energy‐conversion cycles. The performance of both the proposed energy conversion cycles is compared with that of the Olsen cycle. The electro–optic and thermo–electro–optic cycles are found to harvest 7–10 times more energy than the Olsen cycle alone, respectively. Moreover, both energy‐conversion cycles offer broader flexibility and ease in operating conditions, thus paving a way toward the practical applications of multisource energy harvesting with a single material for enhanced energy‐conversion capability and device/system compactness.

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Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology

Cited by 89 publications

References 15 publications

Energy Applications of Magnetocaloric Materials

Energy Applications of Magnetocaloric Materials

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

Coalition of Thermo–Opto–Electric Effects in Ferroelectrics for Enhanced Cyclic Multienergy Conversion

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