Graphene embedded form stable phase change materials for drawing the thermo-electric energy harvesting

Yu, Chengbin; Yang, Sei Hyun; Pak, Seong Yeol; Youn, Jae Ryoun; Song, Young Seok

doi:10.1016/j.enconman.2018.05.001

Cited by 94 publications

(31 citation statements)

References 39 publications

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“…To utilize light energy effectively, the present study will measure the sunlight intensity at the surface of working materials and its utilization for TES applications. The PCMs can store the external heat due to their high latent heat, good thermal stability, and thermal reliability. , However, the leakage problem is hindering the application of PCMs and carbon-based aerogels are now being selected as supporting materials to prevent leakage during the phase transition process. , As mentioned in some research studies, the infiltration method can hold a large weight fraction of pure PCMs in spite of the volume shrinkage, which causes some weight loss of the working materials. , To reduce volume shrinkage, modified supporting materials are reported in various research reports, without the manufacture of PCM composites. , Hence, a cross-linked graphene aerogel is recommended as a supporting material to fabricate form-stable PCM composites.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Structural Stability of Graphene Aerogel for Thermal Energy Harvesting

Kim

Youn

et al. 2021

ACS Appl. Energy Mater.

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In this work, a modified graphene aerogel with high mechanical properties is synthesized. Structural stability is a general problem of graphene aerogels. Graphene oxide (GO) is employed to provide functional groups on the surface by the oxidation of potassium permanganate (KMnO4). The internal structure of the graphene aerogel is successfully cross-linked using a cysteamine vapor method. The cross-linked graphene/cysteamine aerogel (GCA) is strong enough to reduce volume shrinkage during the phase change material (PCM) infiltration process. Furthermore, the GCA can hold some additional pure PCM into the internal space without any structural damage. To consider the application in external environments, we adopt solar light, and the GCA-supported PCM composites can readily absorb solar light with various intensities to transfer the thermal energy. PCM composite constructed PN junction thermoelectric power generator (PN TEG) can produce electrical energy according to the light-on/-off process, where the thermoelectric energy harvesting efficiencies are 67.92 and 41.72%, respectively. To demonstrate the experimental results, the finite numerical calculation method is utilized.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Structural Stability of Graphene Aerogel for Thermal Energy Harvesting

Kim

Youn

et al. 2021

ACS Appl. Energy Mater.

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“…Energy conversion and storage of MTPCMs. Employing PCMs in the areas of solar energy utilization, heat recovery, and power supply and demand regulation is all due to their large latent heat endows them with great energy conversion and storage potentials 27,28,29 . Limited by the severe uctuation of sunlight, the solar-thermal conversion system cannot support a persistent output.…”

Section: Resultsmentioning

confidence: 99%

“…Herein, the para n in MTPCMs was replaced by EBiInSn (eutectic alloy of Bi, In, and Sn) whose melting point is 60°C to amplify the temperature gradient between the hot and cold side. The commercial thermoelectric device was a semiconductor that can convert the heat in the MPTCM into electrical energy according to the principle of the Seeback effect 2,27 . As the heat source, the MTPCM was heated until the EBiInSn therein was melted.…”

Section: Resultsmentioning

confidence: 99%

Magnetically tightened form-stable phase change materials with modular assembly and geometric conformality features

Lu¹,

Yu²,

Dong³

et al. 2021

Preprint

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Recently, phase change materials (PCMs) have attracted significant attention due to their promising applications in many fields like solar energy and chip cooling. However, the present PCMs seriously suffer inevitable leakage and low thermal conduction. Magnetism can produce invisible field effects in the surrounding space. If there exist magnetic particles within this region, the effects will act on them emerging various fascinating phenomena. Inspired by this, we introduce hard magnetic particles (which can keep the effect after removing the magnetic field) to PCMs synthesizing an unprecedented magnetically tightened form-stable PCMs (MTPCMs), achieving multifunctions of leakage-proof, dynamic assembly and morphological reconfiguration, superior high thermal (increasing of 1400%~1600%) and electrical (>104 S/m) conductivity, and prominent compressive strength. Novel free-standing temperature control and high-performance thermal and electric conversion systems based on MTPCMs are furthermore developed. This work is a significant step toward exploiting a smart PCM for electronics and low-temperature energy storage.

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“…The thermoelectric power generator has been utilized to resolve energy depletion and PCMs are connected to the power generator device due to their excellent thermal stability during the heating and cooling processes [21,22]. In this respect, PCMs are employed as working materials to control the degree of thermoelectric energy conversion [23,24]. The positive negative thermoelectric generator (PN TEG), which is based on N and P type semiconductors, has been utilized in the energy harvesting field using the Seebeck effect [25,26].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermoelectric Energy Harvesting with Graphene Aerogel-Supported Form-Stable Phase Change Materials

Song

2021

Nanomaterials

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Graphene aerogel-supported phase change material (PCM) composites sustain the initial solid state without any leakage problem when they are melted. The high portion of pure PCM in the composite can absorb or release a relatively large amount of heat during heating and cooling. In this study, these form-stable PCM composites were used to construct a thermoelectric power generator for collecting electrical energy under the external temperature change. The Seebeck effect and the temperature difference between the two sides of the thermal device were applied for thermoelectric energy harvesting. Two different PCM composites were used to collect the thermoelectric energy harvesting due to the different phase transition field in the heating and cooling processes. The graphene nano-platelet (GNP) filler was embedded to increase the thermal conductivities of PCM composites. Maximum output current was investigated by utilizing these two PCM composites with different GNP filler ratios. The thermoelectric energy harvesting efficiencies during heating and cooling were 62.26% and 39.96%, respectively. In addition, a finite element method (FEM) numerical analysis was conducted to model the output profiles.

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Graphene embedded form stable phase change materials for drawing the thermo-electric energy harvesting

Cited by 94 publications

References 39 publications

Enhancement of Structural Stability of Graphene Aerogel for Thermal Energy Harvesting

Enhancement of Structural Stability of Graphene Aerogel for Thermal Energy Harvesting

Magnetically tightened form-stable phase change materials with modular assembly and geometric conformality features

Analysis of Thermoelectric Energy Harvesting with Graphene Aerogel-Supported Form-Stable Phase Change Materials

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