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Herein, an approach for development of a novel FS-PCMCs by incorporation of FAs into the GCA, which was derived from one-step hydrothermal of C-MWCNTs and GO followed by annealing treatment, through a simple direct impregnation. The FS-PCMCs was developed for solar energy storage. [Display omitted] The exploitation of excellent performance form-stable phase change material composites (FS-PCMCs) with enhanced photothermal conversion efficiency and high phase change latent heat is of great significance for thermal energy storage. In this work, a new type of FS-PCMCs with superior light-to-thermal conversion performance were created by impregnation of organic phase change material (1-hexadecylamine (HDA) and 1-tetradecylamine (TDA)) into the graphene aerogel (GA) and all-carbon aerogel (GCA) through a simple direct infusion. The multiwalled carbon nanotubes (MWCNTs) are wound around the inner wall of the GA layer to form a three-dimensional (3D) porous network structure to support fatty amine (FAs), thus achieving shape stability before and after phase transition. Moreover, the FS-PCMCs has extremely high phase transition enthalpy (203.1–248 kJ·kg−1) and good recyclability. More importantly, due to the high absorbance of GCA, it can enhance its light absorption capacity and reduce thermal radiation. The light-to-thermal conversion efficiency of the FS-PCMCs is 72.36%-88.25%. Taking the improvement of the comprehensive properties of the FS-PCMCs, the results of this work may open up a way for rational design and preparation of high-performance FS-PCMCs with enhanced storage capacity and light-to-thermal conversion efficiency for the efficient utilization of solar energy. [ABSTRACT FROM AUTHOR]

Renewable pectin and cost-effective palygorskite (Pal) were used as raw materials to prepare hierarchically porous carbonized aerogels. The addition of cations (Ca2+) initiates supramolecular bonding of chains in the polymer and enhances the performance of the aerogel. Unlike the previous fragile biomass porous materials, the carbonized aerogels prepared this time showed excellent mechanical properties, with a compressive strength of up to 0.4 MPa at 80% strain. Dodecylamine (DDA) was loaded into the carbonized aerogel by the melt dipping method to obtain a stable phase change material (PCM) with positive performance. Furthermore, the chemical structure, microstructure, thermal stability, mechanical properties, heat storage performance, and thermal conductivity of carbonized clay/pectin aerogels and those of as-prepared composite PCMs were determined by various characterization techniques. The results demonstrate that inexpensive supporting materials can effectively improve the shape stability and thermal conductivity of composite PCMs. Meanwhile, the composite PCMs possess suitable phase transition temperature, reliable photothermal energy storage capacity, and excellent shape stability. The energy storage capacity and reliability of those cost-effective carbon-based form stable phase change materials (FSPCMs) reveal their tremendous application potential in solar energy utilization. • Resourceful raw materials were prepared as support with a simple method. • Palygorskite enhances the shape stability of composite phase change material (PCM). • Carbonized aerogel has an excellent mechanical property (0.4 MPa at 80% strain). • The composite PCM has a phase change enthalpy of 161.8 kJ kg−1 (after 300 cycles). • The photothermal conversion efficiency of composite PCM enables reach up to 77.5%. [ABSTRACT FROM AUTHOR]