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Microencapsulation of paraffin with melamine formaldehyde shell (Pn@MF) shows the drawbacks of low thermal conductivity. Hence, we constructed SiO2 shells on Pn@MF phase change microcapsules by interfacial polycondensation to obtain Pn@MF@SiO2 double‐shelled microcapsules. The effect of tetraethoxysilane (TEOS) contents on the performance of Pn@MF@SiO2 was discussed in detail. As the TEOS contents increased, the thermal conductivity of Pn@MF@SiO2 gradually increased, reaching up to 0.376 W m−1 K−1. The Pn@MF@SiO2 have exhibited superior leakage‐proof properties and thermal reliability through double‐shelled protection, and the highest reduction in leakage rate reached 45.06 % compared to Pn@MF microcapsules. The Pn@MF@SiO2‐3 with the lowest enthalpy still exhibit a latent heat storage capacity of more than 176 J/g, which displayed outstanding latent heat storage/release capability and good anti‐permeable property. [ABSTRACT FROM AUTHOR]

In this work, we developed a type of shape-stabilized phase change materials (SSPCMs) based on carbonized melamine foam/graphene aerogel (CMGA) as a supporting material and polyethylene glycol (PEG) as a phase change material. PEG@CMGA SSPCMs were prepared by fabricating a series of CMGA double skeleton with different carbonization temperatures using freeze-drying and high-temperature carbonization, followed by vacuum impregnation of PEG into the CMGA double skeleton. The morphological structure, thermal storage property, shape stability, thermal conductivity, and solar/electric conversion behavior of the fabricated SSPCMs are investigated. The results showed that PEG@CMGA SSPCMs exhibited excellent shape stability, high latent thermal storage capacity of 181.2 J/g, thermal cycling stability, enhanced thermal conductivity with 387% higher than that of pure PEG, solar-to-thermal energy conversion capability with high efficiency of 91.7% and electric-to-thermal energy conversion capability with high efficiency of 87.3%. The results of this work provide a strategy for the design and development of high performance, multiple energy conversion forms of SSPCMs for promising applications in solar energy utilization, energy-efficient buildings, and heat preservation. [Display omitted] • CMGA double skeleton with excellent mechanical property is constructed by in situ self-assembly and carbonization. • The composite phase change materials possess excellent energy storage properties and high thermal conductivity. • PEG@CMGA 1600 SSPCMs achieve efficient solar-to-thermal conversion efficiency of 91.7%. • PEG@CMGA 1600 SSPCMs exhibit electric-to-thermal energy conversion capability with high efficiency of 87.3%. [ABSTRACT FROM AUTHOR]

In this paper, a series of silicone rubber (SR)/thermochromic microcapsules (TC@MF)/cuprous oxide (Cu 2 O) flexible phase change composites (STC) with multi-colors and reversible thermochromic were prepared. In this composite, SR was used as polymer matrix and TC@MF with phase change enthalpy of 193 J/g was used as functional filler. Moreover, different contents of Cu 2 O were introduced to change color of composites and improve thermal conductivity and photothermal conversion. The STC composites could undergo reversible color changes from blue-violet to red with a color change temperature of approximately 52 °C. And it exhibited excellent leakage resistance with the leakage rate of STC-2 as low as 0.41%. The thermal conductivity of the STC-3 composite reached 0.33 W m−1 K−1 at Cu 2 O content of 9 phr. The STC composites were applied to dissipate heat from the battery and the maximum surface temperature was only 49.0 °C at 9.8 A discharge rate which represented 24.03 % reduction in surface temperature compared to the bare battery. This work offers an effective route for preparation of battery thermal regulation materials based on thermochromic microcapsules, which has significant potential for application in the field of battery thermal management. [Display omitted] • Cu 2 O can enhance the thermal conductivity and photothermal conversion of the composites. • TC@MF and Cu 2 O were cleverly utilized to synergistically improve the safety of the thermal management materials. • The composites exhibited excellent reversible thermochromic capacities with blue-violet to red transformation. • The composites showed efficient battery thermal management capacity. [ABSTRACT FROM AUTHOR]