Low-cost, three-dimension, high thermal conductivity, carbonized wood-based composite phase change materials for thermal energy storage

Yang, Haiyue; Wang, Shaobin; Yu, Qianqian; Cao, Guoliang; Sun, Xiaohan; Yang, Rue; Zhang, Qiong; Liu, Feng; Di, Xin; Li, Jian; Wang, Chengyu; Li, Guoliang

doi:10.1016/j.energy.2018.06.207

Cited by 106 publications

(41 citation statements)

References 29 publications

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“…Furthermore, the latent heat capacities of melting of both bio‐chars prepared in this work were compared with those of different bio‐based carbons reported in literature (Table 2). 23,29,31‐34,41‐47 As can be seen evidently from the tabulated data, the LHTES properties of the composites are varied depending on the confinement rate and latent heat energy capacity of PCM. Accordingly, both CHW/CA and ACHW/CA composites have higher phase change enthalpies than that of many bio‐based carbon/PCM composites.…”

Section: Resultsmentioning

confidence: 97%

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

et al. 2021

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Summary Two kinds of new bio‐chars were produced from carbonization of waste hazelnut wood as low‐cost and eco‐friendly supporting matrices to simultaneously solve the seepage and low thermal conductivity problem of capric acid (CA) used as a phase change materials (PCM) for thermal management applications. In the prepared seepage‐free composites, the CA was impregnated by 52 and 64 wt% into porous structure of carbonized hazelnut wood (CHW) and activated carbonized hazelnut wood (ACHW), respectively. The SEM analysis exhibited that the CA was well confined by CHW and ACHW. FTIR and XRD investigations confirmed the existence of good chemical compatibility between CA and CHW/or ACHW. DSC results indicated that the seepage‐free CHW/CA and ACHW/CA composites have melting points of 28.5°C and 28.9°C, and melting enthalpies of 111.3 and 110.3 J/g, respectively. TG analyses revealed that the functioning temperatures of the composites were considerably lower than their thermal degradation temperatures. The LHTES properties and chemical structure of the composites was not altered throughout 1000‐cycling thermal test. The thermal conductivity of CHW/CA and ACHW/CA were 2.70 to 3.05 times higher than that of pure CA. The decrease in melting/solidification time of the composites proved the improvement in their thermal conductivities compared with pure CA. Consequently, the produced bio‐chars can be evaluated as supporter and thermal conductivity enhancer materials (TCEMs) for PCMs; besides, the fabricated composite PCMs can be considered as hopeful admixtures to fabricate of cost‐effective, eco‐friendly and energy‐efficient new types of mortar, concrete and plaster which can be used for thermal management implementations in buildings.

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Section: Resultsmentioning

confidence: 97%

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

et al. 2021

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“…For CF, no sharp diffraction peaks were observed. Instead, there were two weak and broad peaks centred at approximately 24° and 43°, which indicated that the CF was made up of amorphous carbon . For pure PEG, two strong diffraction peaks at approximately 19° and 23° were observed, which corresponded to (102) and (032) crystal plane diffractions, respectively .…”

Section: Resultsmentioning

confidence: 97%

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

et al. 2020

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Phase‐change materials (PCMs) have been widely investigated as candidates for thermal energy storage and solar thermal energy conversion. However, low thermal conductivity and poor shape stability during phase transition processes are detrimental to their practical applications. In this study, we designed composite PCMs based on carbon foam (CF) via the vacuum impregnation method to overcome these problems. CF with 3D interconnected microporous structures and good compressive strength was fabricated from phenolic resin (PF) using a combined process of carbonization and sacrificial template techniques. The developer material is considered a promising support material for PCMs. The as‐prepared polyethylene glycol/CF composite (PCC) exhibited a high energy‐storage density with a melting enthalpy of 135.7 J/g, and the thermal conductivity was enhanced by 109.8% compared to that of pure polyethylene glycol. In addition, the PCC showed excellent thermal stability and leakage‐proof performance after 100 heating/cooling cycles and good compressive strength. Because of the simple preparation process and low cost, PCC is a promising material for various thermal energy storage applications, especially in building energy storage systems.

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“…For CMS-WBB, which was formed by adding copper microspheres to WBB, there were two typical diffraction www.nature.com/scientificreports/ peaks at 43.31° and 50.41°, which represented the diffraction of (111) and (200) planes of cubic copper, and the same peaks also appeared in SA/CMS-WBB-2 synthesized by using CMS-WBB as carrier, which indicated that copper microspheres were successfully added to WBB 4,33 . In addition, the broad and weak peaks of WBB and CMS-WBB at 23.27° and 42.92° correspond to the (002) and (100) planes of the graphite crystal, which indicated that both WBB and CMS-WBB formed disordered graphite crystallite structure 23,34 . The XRD patterns of SA/CMS-WBB-2 and CMS-WBB were expanded in the 2θ = 30°-60°, as shown in Fig.…”

Section: Chemical Properties Of Sa Sa/cms-wbb-1 Wbb Cms-wbb the Fmentioning

confidence: 98%

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

Chen

et al. 2021

Sci Rep

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Metal microspheres doping porous carbon (MMPC), which was prepared using in-situ pyrolysis reduction strategy, could enhance the thermal conductivity of shape-stabilized phase change material (ss-PCM) prepared by MMPC as the matrix. However, in previous studies that were reported, the preparation of MMPC needed to synthesize porous carbon by pyrolysis firstly, and then porous carbon adsorbed metal ions was pyrolyzed again to obtain MMPC, which was tedious and energy-prodigal. In this study, a one-step pyrolysis strategy was developed for the synthesis of MMPC through the pyrolyzation of wheat bran adsorbed copper ions, and the copper microspheres doping wheat bran biochar (CMS-WBB) was prepared. The CMS-WBB was taken as the supporter of stearic acid (SA) to synthesize the ss-PCM of SA/CMS-WBB. The study results about the thermal properties of SA/CMS-WBB demonstrated that the introduction of copper microspheres could not only improve the thermal conductivity of SA/CMS-WBB, but also could increase the SA loading amount of wheat bran biochar. More importantly, the CMS-WBB could be obtained by only one-step pyrolysis, which greatly simplified the preparation process and saved energy consumption. Furthermore, the raw material of wheat bran is a kind of agricultural waste, which is abundant, cheap and easy to obtain. Hence, the SA/CMS-WBB synthesized in this study had huge potentialities in thermal management applications, and a simplified method for improving the thermal properties of ss-PCMs was provided.

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Low-cost, three-dimension, high thermal conductivity, carbonized wood-based composite phase change materials for thermal energy storage

Cited by 106 publications

References 29 publications

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

Shape-stabilized phase change material with highly thermal conductive matrix developed by one-step pyrolysis method

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