Enhancement of Thermo-Electric Energy Conversion Using Graphene Nano-platelets Embedded Phase Change Material

Yu, Chengbin; Youn, Jae Ryoun; Song, Young Seok

doi:10.1007/s13233-021-9067-7

Cited by 11 publications

(8 citation statements)

References 41 publications

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“…The 3D porous graphene aerogels can sustain their high porosities to keep the pure PCM high weight fraction with form stability. The polyethylene glycol (PEG) was melted and put into the different graphene aerogels [ 47 ].…”

Section: Methodsmentioning

confidence: 99%

Characterization of Phase Change Materials Fabricated with Cross-Linked Graphene Aerogels

Song

2022

Gels

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3D porous graphene aerogel exhibits a high surface area which can hold plenty of pure phase change material (PCM) into the internal space. In order to maintain the flexibility of PCM without volume shrinkage under the external force, cross-linked graphene aerogel was prepared by the cysteamine vapor method. The cross-linked graphene aerogel had a high stress–strain durability and chemical stability for infiltrating PCM to produce a form-stable PCM composite. The latent heat of PCM is one of the elements to estimate the capacity of PCM thermal energy storage (TES) during the phase transition process. The cross-linked graphene aerogel-supported PCM composite showed a great TES to be utilized in thermal-to-electrical energy harvesting. The cross-linked graphene aerogel also had an excellent mechanical property of preventing damage at a high temperature.

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Section: Methodsmentioning

confidence: 99%

Characterization of Phase Change Materials Fabricated with Cross-Linked Graphene Aerogels

Song

2022

Gels

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“…The cross-linked graphene aerogel can effectively increase the mechanical properties and even tolerate external force at over the melting temperature. The GO and GNP mass ratios can influence the efficiency of thermoelectric energy harvesting, and based on the maximum output efficiency the GO&KMnO 4 with 1:2 GNP mass ratio graphene aerogel (GCA 1:2) is used to infiltrate pure PEG, while GO&KMnO 4 with 1:1 GNP mass ratio graphene aerogel (GCA 1:1) is utilized for fabricating the 1-TD composite. , …”

Section: Experimental Sectionmentioning

confidence: 99%

“…The GO and GNP mass ratios can influence the efficiency of thermoelectric energy harvesting, and based on the maximum output efficiency the GO&KMnO 4 with 1:2 GNP mass ratio graphene aerogel (GCA 1:2) is used to infiltrate pure PEG, while GO&KMnO 4 with 1:1 GNP mass ratio graphene aerogel (GCA 1:1) is utilized for fabricating the 1-TD composite. 36,39 2.4. Characterization.…”

Section: Preparation Of the Modified Graphene Aerogel And Pcm Compositesmentioning

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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“…A lot of work has been reported for the development of electric energy harvesting. [40,41] Electric devices can be used to observe the energy conversion process. [42,43] The thermal absorption by PCM for the construction of thermal-to-electrical energy harvesting system can produce an induced output electrical energy under the change of external temperature.…”

Section: Introductionmentioning

confidence: 99%

Graphene Aerogel‐Supported Phase‐Change Material for Pyroelectric Energy Harvesting: Structural Modification and Form Stability Analysis

Song

2023

Energy Tech

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3D porous graphene aerogel (GA) has a capability to infiltrate plenty of phase‐change materials (PCM) into the internal pore. Since carbon‐based materials can offer excellent solar light absorption and conversion of thermal energy, they are widely used as container‐like supporting materials. In general, the GA shows a volume shrinkage problem due to the capillary force during the infiltration process, thus causing a loss in pore volume, that is, PCM weight loss. The PCM amount is proportional to both the absorbed and released thermal energies. Herein, cysteamine is introduced to bind GA. The PCM composite can reduce the volume shrinkage and have an excellent form stability even under the external force. Two kinds of PCMs are connected to a pyroelectric electrode to generate electrical energy. In addition, finite‐element method estimates the temperature profile and electrical peaks to confirm experimental results.

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Enhancement of Thermo-Electric Energy Conversion Using Graphene Nano-platelets Embedded Phase Change Material

Cited by 11 publications

References 41 publications

Characterization of Phase Change Materials Fabricated with Cross-Linked Graphene Aerogels

Characterization of Phase Change Materials Fabricated with Cross-Linked Graphene Aerogels

Enhancement of Structural Stability of Graphene Aerogel for Thermal Energy Harvesting

Graphene Aerogel‐Supported Phase‐Change Material for Pyroelectric Energy Harvesting: Structural Modification and Form Stability Analysis

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