Phase change material filled hybrid 2D / 3D graphene structure with ultra-high thermal effusivity for effective thermal management

Liang, Gengyuan; Zhang, Jianwei; An, Shaohang; Tang, Jun; Ju, Sheng; Bai, Shuxin; Jiang, Dazhi

doi:10.1016/j.carbon.2020.12.046

Cited by 41 publications

(7 citation statements)

References 37 publications

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“…TCEF is a valuable metric in thermophysical energy storage application as it emphasizes the importance of minimizing the amount of the filler used to improve TC in order to maintain a high energy density . To put the results into perspective, in Figure b, we compared the TCEF of paraffin-based PCC using other high-TC continuous carbon filler systems (graphitic porous carbon, graphene foam, CF network, and CNT sponge) and discrete carbon filler system (CFs). It is seen that our samples present a TCEF between 400 and 831%, indicating significant advantages compared to their range of 5–300%.…”

Section: Resultsmentioning

confidence: 99%

“…To improve the thermal storage performance of the system, the content of the PCM should be as high as possible while maintaining high TC of PCC. Figure c compares the thermal effusivity of different systems, the thermal effusivity of carbon filler/paraffin composites is usually less than 30 J·cm –3/2 (m·s·k) –1/2 , and for other GF network systems, ,− ,, it is difficult to exceed 50 J·cm –3/2 (m·s·k) –1/2 . In this study, the thermal effusivity of S5 reached 63 J·cm –3/2 (m·s·k) –1/2 .…”

Section: Resultsmentioning

confidence: 99%

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Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Zhang,

Jiang,

Qin

et al. 2023

ACS Appl. Mater. Interfaces

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Phase-change materials (PCMs) are promising thermal storage medium for thermal management due to their efficient thermal energy harvesting capabilities. However, the low thermal conductivity (TC) and poor shape stability of PCMs have hindered their practical applications. Construction of an interconnected three-dimensional (3D) heat-conductive structure is an effective way to build phonon conduits and provide PCM confinement. Phonon scattering at the interface is an unavoidable effect that undermines the TC improvement in the PCM composite and necessitates careful engineering. This study focuses on creating a highly thermally conductive 3D carbon-bonded graphite fiber (CBGF) network to enhance the TC of the PCM, with attention especially on thermal interface engineering considering both filler−matrix (F−M) and filler−filler (F−F) interfaces. The composite with an optimized proportion of F−M and F−F interface area achieves the highest TC of 45.48 W•m −1 •K −1 , which is 188.5 times higher than that of the pure PCM, and a high TC enhancement per volume fraction of the filler (TCEF) of 831% per 1 vol % loading. This also results in an enhanced spatial construction for PCM confinement during the phase change. The results emphasize the significance of interface engineering in creating high-TC and form-stable phase-change composites, providing insightful guidance for rational structural design.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Zhang,

Jiang,

Qin

et al. 2023

ACS Appl. Mater. Interfaces

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“…Then, 5 mL of poly(diallyldimethylammonium chloride (PDDA) solution, 20 wt %) was added to the above solution and stirred for 4 h at 45 °C to generate a positive charge on the surface of MnO 2 nanospheres. The modified MnO 2 (50 mg) was dissolved in 50 mL of distilled water, and GO solution (4 mg mL −1 , graphene oxide (GO) prepared by the modified Hummers method 32 ) was dropped into the above solution until it had completely coagulated. Finally, the precipitate was subjected to centrifugal washing and further heattreated at 300 °C for 2 h under air to obtain the MnO 2 @rGO core− shell structure.…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic Monitoring of the Electrode Process of MnO₂@rGO Nanospheres and Its Application in High-Performance Flexible Micro-Supercapacitors

Zhao

Qiao

et al. 2022

ACS Appl. Mater. Interfaces

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Structural instability is a major obstacle to realizing the high performance of a MnO2-based pseudocapacitor material. Understanding its structure transformation in the process of electrochemical reaction, therefore, plays an important role in the efficient enhancement of rate capacity and stability. Herein, a stable MnO2@rGO core–shell nanosphere is first synthesized by a liquid–liquid interface deposition further combined with the electrostatic self-assembly method. The structural transformation process of the MnO2@rGO electrode is monitored by ex situ Raman and X-ray diffraction spectroscopy during the charging–discharging process. It is found in the first discharging process that layered-MnO2 transforms into the spinel-Mn3O4 phase with K+ ion intercalation. From the second charging, the spinel-Mn3O4 phase is gradually adjusted to a more stable λ-MnO2 with a three-dimensional tunnel structure, finally realizing the reversible intercalation/deintercalation of K+ ions in the λ-MnO2 tunnel structure during subsequent cycling, which can be attributed to the presence of oxygen vacancies formed by the lengthening of the Mn–O bond and losing oxygen in the MnO6 octahedral unit with K+ ion intercalation/deintercalation. Meanwhile, the MnO2@rGO electrode demonstrates a high specific capacitance of 378 F g–1 at 1 A g–1 and excellent cycling stability with a capacitance retention of up to 89.5% after 10 000 cycles at 10 A g–1. Furthermore, the assembled symmetric micro-supercapacitor delivers a high areal energy density of 1.01 μWh cm–2, superior cycling stability with no significant capacity decay after 8700 cycles, and a capacity retention rate of almost 100% after 2000 bending cycles, showing great mechanical flexibility and practicability.

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“…Graphene, a two-dimensional network of nanomaterials composed of carbon atoms, is obtained by destroying van der Waals forces in graphite. The thickness of a single-layer graphene is 0.35 nm, which is the thinnest two-dimensional material discovered by researchers in the world. − Graphene has many excellent properties, such as electrical, optical, and mechanical properties, but graphene itself has a high surface stability and exhibits strong inertness. Therefore, in the dispersion process, graphene is prone to agglomeration, and this leads to the reduction of its specific surface area .…”

Section: Introductionmentioning

confidence: 99%

Barrier and Biodegradable Properties of Poly(butylene adipate-co-terephthalate) Reinforced with ZnO-Decorated Graphene Rendering it Antibacterial

Tsou

Liu

et al. 2023

ACS Appl. Polym. Mater.

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In this paper, ZnO-decorated graphene (ZnO-graphene) was added to poly(butylene adipate-co-terephthalate) (PBAT) and maleic anhydride-grafted poly(butylene adipate-co-terephthalate) (PBAT-g-MAH) to prepare antibacterial nanocomposites through melt blending. The effect of different amounts of ZnO-graphene on the properties of the nanocomposite materials was discussed. The results of Fourier transform infrared (FTIR) analysis showed that PBAT-g-MAH could form coordination reaction and hydrogen bond with ZnO-graphene, and this synergistically enhanced the tensile properties of the nanocomposites. With the introduction of functional groups, the mechanical properties of PBAT-g-MAH/ZnO-graphene nanocomposites were significantly improved. Compared with pure PBAT, the nanocomposites showed that the maximum tensile strength, yield strength, and elongation at break increased by 20.58, 17.04, and 7.51%, respectively. This work revealed for the first time through X-ray diffraction tests the probable mechanism of dispersion or compatibility in the nanocomposites. Water absorption properties and water contact angle data proved that the introduction of MAH, along with the optimal amount of nanofillers, could greatly improve the tightness of internal and surface structures of the nanocomposites. Relative to PBAT, the use of PBAT-g-MAH/ZnO-graphene containing 0.6% nanofillers significantly improved the water vapor and oxygen barrier efficiencies by 152.8 and 273.5%, respectively. It was shown from the results of antibacterial evaluation that ZnO-graphene could impart PBAT and PBAT-g-MAH with excellent antibacterial activity. Compared with pure PBAT, the nanocomposite films had better mechanical and barrier properties. Both PBAT and PBAT-g-MAH nanocomposites could decompose naturally in soil, indicating that they were environmentally friendly and would have great application prospect in the fields of packaging and medical industries.

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Phase change material filled hybrid 2D / 3D graphene structure with ultra-high thermal effusivity for effective thermal management

Cited by 41 publications

References 37 publications

Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Spectroscopic Monitoring of the Electrode Process of MnO₂@rGO Nanospheres and Its Application in High-Performance Flexible Micro-Supercapacitors

Barrier and Biodegradable Properties of Poly(butylene adipate-co-terephthalate) Reinforced with ZnO-Decorated Graphene Rendering it Antibacterial

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Phase change material filled hybrid 2D / 3D graphene structure with ultra-high thermal effusivity for effective thermal management

Cited by 41 publications

References 37 publications

Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Thermal Interface Engineering in a 3D-Structured Carbon Framework for a Phase-Change Composite with High Thermal Conductivity

Spectroscopic Monitoring of the Electrode Process of MnO2@rGO Nanospheres and Its Application in High-Performance Flexible Micro-Supercapacitors

Barrier and Biodegradable Properties of Poly(butylene adipate-co-terephthalate) Reinforced with ZnO-Decorated Graphene Rendering it Antibacterial

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Product

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About

Spectroscopic Monitoring of the Electrode Process of MnO₂@rGO Nanospheres and Its Application in High-Performance Flexible Micro-Supercapacitors