Effects of biochar pyrolysis temperature on thermal properties of polyethylene glycol/biochar composites as shape-stable biocomposite phase change materials

Liu, ShiWang; Peng, Shigui; Zhang, Bingbing; Xue, Bin; Yang, Zhao; Wang, Sheng; Xu, Guomin

doi:10.1039/d1ra09167k

Cited by 35 publications

(13 citation statements)

References 54 publications

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“…Figure 5 a shows the SEM photographs of the used biochar, BC600, under a pyrolysis temperature of 600 °C. It is seen that BC600 shows a honeycomb porous structure, with its carbonaceous macropores as channels for adsorbates entering the porous system locating on the wall [ 26 ]. The micromorphology of various GO-PEG/biochar PCMs with a different weight ratio of PGO-CTAB to CS6 was given.…”

Section: Resultsmentioning

confidence: 99%

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

et al. 2023

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In recent years, phase change materials (PCMs) have been widely used in waste heat utilization, buildings, and solar and wind energy, but with a huge limitation from the low thermal conductivity, photothermal conversion efficiency, and low latent heat. Organic PCMs are eyecatching because of its high latent heat storage capability and reliability, but they still suffer from a lack of photothermal conversion and sharp stability. Here, we prepared sharp-stable PCMs by establishing a carbon material frame system consisting of graphene oxide (GO) and biochar. In particular, surfactants (CTAB, KH-560 and KH-570) were employed to improve the dispersity of GO in PEG. The differential scanning calorimetry results shows that the latent heat of PEG modified by CTAB grafted GO (PGO-CTAB) was the highest (191.36 J/g) and increased by 18.31% compared to that of pure PEG (161.74 J/g). After encapsulation of PGO-CTAB in biochar, the obtained composite PCM with the amount of biochar and PGO-CTAB in weight ratio 4:6 (PGO-CTAB/CS6(6)) possesses relatively high latent heat 106.51 J/g with good leak resistance and thermal stability, and with obviously enhanced thermal conductivity (0.337 W/(m·K)) and photothermal conversion efficiency (77.43%), which were higher than that of PEG6000 (0.325 W/(m·K), 44.63%). The enhancement mechanism of heat transfer and photothermal conversion on the composite PCM is discussed.

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Section: Resultsmentioning

confidence: 99%

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

et al. 2023

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“…The formstable PCMs showed a significant increase in supercooling degree compared with pure PEG800 and a trend of decreasing supercooling degree with increasing mass fraction of PCMs. Furthermore, the use of recyclable skeletons including modified fly ash [82] and corn draw [94] also resulted in a significantly higher supercooling degree for the form-stable PCMs.…”

Section: Supercoolingmentioning

confidence: 99%

Recent advances in energy storage and applications of form‐stable phase change materials with recyclable skeleton

Jia,

Jiang,

Pan

et al. 2024

Carbon Neutralization

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With the expansion of the global population, the energy shortage is becoming increasingly acute. Phase change materials (PCMs) are considered green and efficient mediums for thermal energy storage, but the leakage problem caused by volume instability during phase change limits their application. Encapsulating PCMs with supporting materials can effectively avoid leakage, but most supporting materials are expensive and consume huge of natural resources. Carbon materials, which are rich and renewable resources, can be used as economical and environmentally friendly supporting skeletons to prepare form‐stable PCMs. Although many researchers have begun to use recyclable materials especially various derivatives of carbon as supporting skeletons to prepare form‐stable PCMs, the preparation methods, thermophysical properties and applications of form‐stable PCMs with recyclable skeletons have rarely been systematically summarized yet. Form‐stable PCMs with a recyclable skeleton can be used as green and efficient thermal storage materials due to their high heat storage capacity and good thermophysical stability after 2000 thermal cycles. This review investigates the effects of recyclable skeletons on the thermophysical properties including phase change temperature, latent heat, thermal conductivity, supercooling, and thermal cycling reliability. Four major kinds of recyclable skeletons are focused on: biomass, biochar, industrial by‐products as well as waste incineration ash. Additionally, the application scales of form‐stable PCMs with recyclable skeletons are explicated in depth. Moreover, the main challenges confronted by form‐stable PCMs with recyclable skeletons are discussed, and future research trends are proposed. This article provides a systematic review of the form‐stable PCMs with recyclable skeletons, giving significant guidance for further reducing carbon emissions and promoting the development of sustainable energy.

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“…The biochar can efficiently encapsulate PCMs due to its abundant pore structure. 55 In this study, the sugarcane bagasse was recycled to biocharderived bagasse (BDB) by thermal pyrolysis at low temperatures (350 °C) to keep the aligned microchannels via the biochar structure. The derived biochar was used as an efficient photothermal absorber due to its abundant carbon content, developed specic surface area, high porosity, high solar absorptivity, and abundant aligned microchannels which increases the water transportation to the surface.…”

Section: Introductionmentioning

confidence: 99%

“…53,54 However, the leakage of PCMs during phase transition remains a significant barrier to their practical application. 55 The most effective solution to this problem is the encapsulation of PCMs in an organic or inorganic matrix to produce shape-stable PCM composites. 56 Many supporting materials have been used as matrices such as carbon nanotubes, 57 montmorillonite nanosheets, 58 mesoporous silica, 59 graphene, 60 etc.…”

Section: Introductionmentioning

confidence: 99%

Stable polyethylene glycol/biochar composite as a cost-effective photothermal absorber for 24 hours of steam and electricity cogeneration

Basuny,

Kospa,

Ibrahim

et al. 2023

RSC Adv.

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Effects of biochar pyrolysis temperature on thermal properties of polyethylene glycol/biochar composites as shape-stable biocomposite phase change materials

Abstract: The micropore and mesopore of biochar and the interaction between PEG and biochar surface effectively prevented the leakage of PEG and affected the crystallization and adsorption properties of PEG and the heat storage of composite PCMs.

Cited by 35 publications

References 54 publications

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

Recent advances in energy storage and applications of form‐stable phase change materials with recyclable skeleton

Stable polyethylene glycol/biochar composite as a cost-effective photothermal absorber for 24 hours of steam and electricity cogeneration

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