Polyethylene glycol (PEG)/silicon dioxide grafted aminopropyl group and carboxylic multi-walled carbon nanotubes (SAM) composite as phase change material for light-to-heat energy conversion and storage

Yan, Dongmao; Ming, Weixing; Liu, Song; Yin, Guo-qiang; Zhang, Yuang; Tang, Bingtao; Zhang, Shufen

doi:10.1016/j.est.2021.102428

Cited by 60 publications

(16 citation statements)

References 25 publications

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“…Table 1 summarizes the photothermal conversion efficiency of the PCM-based composites reported in the literature as well as the test result obtained from this study. It is noteworthy that MPCM-BP exhibited a higher conversion efficiency than most of the PCM composites containing optical absorbents, including graphene and graphene oxide (GO), 15,17,51 hollow carbon nanospheres, 52 carbon nanotubes (CNTs), 53,54 MXene, 14,55,56 BP nanosheets and phosphorene nanoflakes. 24,26,27 These results indicate that both BP nanosheets and Fe 3 O 4 nanoparticles are capable of acting as a highly effective optical composite absorbent to enhance the photothermal conversion and storage performance of phase-change microcapsules when decorated on their shell surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Integration of Magnetic Phase-Change Microcapsules with Black Phosphorus Nanosheets for Efficient Harvest of Solar Photothermal Energy

Liu

Qian

Liao

et al. 2021

ACS Appl. Energy Mater.

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Solar photothermal energy storage using phasechange material (PCMs) provides sustainable penetration in comprehensive utilization. However, PCMs are obliged to suffer from low conversion and storage effectiveness in solar photothermal energy due to a low optical absorption capacity. In this study, we developed a type of magnetic phase-change microcapsule system with superior photothermal energy conversion efficiency. The microcapsule system was constructed with n-docosane as a PCM core and a CaCO 3 /Fe 3 O 4 composite shell surface-decorated with black phosphorus (BP) nanosheets employing a Pickering emulsion-templated precipitation technique. The presence of BP nanosheets on the capsule surface not only enhanced the emulsion stability to facilitate the fabrication of a tight CaCO 3 -based shell, resulting in a high latent heat capacity of the microcapsules, but also improved thermal conduction of the microcapsule system, promoting a fast thermal response and heat transfer. The microcapsule system shows a high phase-change enthalpy of over 120 J/g and a significant increase in thermal conductivity by over 400% compared to pure PCM. More importantly, the microcapsule system exhibits a high photothermal conversion efficiency of 95.08%, which is superior to most of the PCM-based composite materials reported in the literature. There is only 0.02% conversion efficiency lost after the 10-cycle photothermal conversion experiment for the microcapsule system, indicating a good working stability for the long-term use of solar photothermal conversion and storage. By decorating magnetic phase-change microcapsules with BP nanosheets on the shell, this study offers a new strategy for development of PCM-based composite materials for efficient harvest and utilization of solar energy. KEYWORDS: magnetic phase-change microcapsules, black phosphorus nanosheets, CaCO 3 /Fe 3 O 4 composite shell, core-shell structure, photothermal conversion efficiency, thermal energy storage

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Section: ■ Results and Discussionmentioning

confidence: 99%

Integration of Magnetic Phase-Change Microcapsules with Black Phosphorus Nanosheets for Efficient Harvest of Solar Photothermal Energy

Liu

Qian

Liao

et al. 2021

ACS Appl. Energy Mater.

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“…Other organic materials found in heat storage are fatty acids [18,19], alcohols [20], esters [21,22] and polymers [23]. Advantages of these materials include non-corrosivity, poor susceptibility to subcooling and good thermal and chemical stability.…”

Section: Applications Of Pcmsmentioning

confidence: 99%

“…Hydrated salts are characterized by the high density of stored heat, low price, lack of toxicity and non-flammability. The disadvantages of hydrated salts include leakage during phase transition [25], overcooling [26], phase separation [23] and low thermal conductivity [27]. Despite the mentioned disadvantages, hydrated salts have found applications in water sub-heating and space heating systems.…”

Section: Applications Of Pcmsmentioning

confidence: 99%

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

et al. 2021

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The paper presents an innovative method for smoothing fluctuations of heat flux, using the thermal energy storage unit (TES Unit) with phase change material and Artificial Neural Networks (ANN) control. The research was carried out on a pilot large-scale installation, of which the main component was the TES Unit with a heat capacity of 500 MJ. The main challenge was to smooth the heat flux fluctuations, resulting from variable heat source operation. For this purpose, a molten salt phase change material was used, for which melting occurs at nearly constant temperature. To enhance the smoothing effect, a classical control system based on PID controllers was supported by ANN. The TES Unit was supplied with steam at a constant temperature and variable mass flow rate, while a discharging side was cooled with water at constant mass flow rate. It was indicated that the operation of the TES Unit in the phase change temperature range allows to smooth the heat flux fluctuations by 56%. The tests have also shown that the application of artificial neural networks increases the smoothing effect by 84%.

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“…Out of the different types of heat storage systems, those using phase transition heat are considered the most promising. Their significant advantage is the high-density energy storage in a narrow temperature range [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Obtainment and Characterization of Metal-Coated Polyethylene Granules as a Basis for the Development of Heat Storage Systems

et al. 2022

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The research studied the feasibility of using copper-coated polyethylene granules as a basis for creating efficient heat storage systems. A technology for imparting catalytic properties to a polymer surface by the joint processing of polymer granules and an activator metal in a ball mill with their subsequent metallization in a chemical reducing solution is proposed. The efficiency of copper-coating a polyethylene surface is shown to be largely determined by the activation stage and the assumption regarding the mechanism of interaction of the activator metal with the polymer surface is made. To obtain different amounts of metal on the polyethylene granules, it is proposed that the method of remetallization is used. It was established that the rate of copper ion reduction depends on the number of previous coatings and is determined by the area of interaction of the metal-coated granules with the chemical reducing solution. The obtained metal-coated polyethylene granules were characterized in terms of the viability of using it as a phase transition material for a heat storage system. Using the developed installation that simulates the heat accumulator operation, it was shown that the efficiency of using metal-coated polyethylene granules to create heat storage systems is higher. The copper coating deposited on the polyethylene granules was studied using scanning electron microscopy and X-ray diffraction analysis.

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Polyethylene glycol (PEG)/silicon dioxide grafted aminopropyl group and carboxylic multi-walled carbon nanotubes (SAM) composite as phase change material for light-to-heat energy conversion and storage

Cited by 60 publications

References 25 publications

Integration of Magnetic Phase-Change Microcapsules with Black Phosphorus Nanosheets for Efficient Harvest of Solar Photothermal Energy

Integration of Magnetic Phase-Change Microcapsules with Black Phosphorus Nanosheets for Efficient Harvest of Solar Photothermal Energy

Application of Phase Change Material and Artificial Neural Networks for Smoothing of Heat Flux Fluctuations

Obtainment and Characterization of Metal-Coated Polyethylene Granules as a Basis for the Development of Heat Storage Systems

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