The leakage of organic phase change materials (OPCMs) at temperatures above their melting point severely limits their large-scale application. The introduction of porous supports has been identified as an efficient leakageproofing method. In this study, a novel carbonized Cu-coated melamine foam (MF)/reduced graphene oxide (rGO) framework (MF/rGO/Cu-C) is constructed as a support for fabricating stabilized multifunctional OPCMs. MF serves as the supporting material, while rGO and Cu act as functional reinforcements. As a thermal energy storage material, polyethylene glycol (PEG) is encapsulated into MF/rGO/Cu-C through a vacuum-assisted impregnation method to obtain PEG@MF/rGO/Cu-C composite with excellent comprehensive performance. PEG@MF/rGO/Cu-C exhibits high phase change enthalpies of 148.3 J g −1 (melting) and 143.9 J g −1 (crystallization), corresponding to a high energy storage capability of 92.7%. Simultaneously, MF/rGO/Cu-C endues the composite with an enhanced thermal conductivity of 0.4621 W m −1 K −1 , which increases by 463% compared to that of PEG@MF. Furthermore, PEG@MF/rGO/Cu-C displays great light-to-thermal and electric-to-thermal conversion capabilities, thermal cycle stability, light-tothermal cycle stability, and shape stability, showing promising application prospects in different aspects.

Transition-metal selenide materials have the potential to be excellent power storage materials owing to their unique physical and structural features. The porous yolk-shelled NiMnSe3 nanospheres synthesized by a two-step hydrothermal and thermal treatment process were used as anode electrode materials for an asymmetric supercapacitor (ASC). The unique yolk-shelled structure and the bimetallic synergistic effect contributed to the improved charge transfer capability of the ASC. With density functional theory calculations, the NiSe2–MnSe heterojunctions illustrate the synergy between NiSe2 and MnSe components along with the charge transfer path at the heterogeneous interface. The NiMnSe3 electrode material has excellent electrochemical properties in the three-electrode system (1093 F g–1 at 0.5 A g–1). The ASC using the NiMnSe3 anode with an activated carbon cathode exhibited a maximum energy density of 74.5 Wh kg–1 and a maximum power density of 8259.3 W kg–1, retaining 99.5% of the initial capacitance after 12,000 cycles. This shows that metal selenide heterojunctions have promising potential for supercapacitor as ASCs.

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