The anisotropic three-dimensional (3D) Ag-welding graphene framework prepared by unidirectional ice-templating freezing casting, was used to encapsulate polyethylene glycol (PEG) as phase change material (PCM) composite in this work. Arising from the decreased interfacial thermal resistance (ITR) in graphene skeleton by Ag-welding and the vertically oriented graphene skeleton as phonon transfer paths, the obtained PCM composite exhibited a high thermal conductivity of 4.3 W m⁻¹ K⁻¹ at graphene loading of ∼6.25 vol%, which improved significantly the heat transfer rate during the heat charging/discharging processes. Meanwhile, the graphene framework gave the PCM composite an excellent solar-thermal conversion ability, which could be further enhanced by Ag-welding strategy. Besides, the 3D porous framework with huge capillary and surface tension forces effectively improved the shape stability and avoided leakage of PCM, with meanwhile remaining high energy storage capacities (147.4–165.9 J g⁻¹). Therefore, the Ag-welding 3D graphene framework reveals the high potential to encapsulate PCM using in solar-thermal conversion field.

在这项工作中，通过单向冰模板冷冻铸造制备的各向异性三维 (3D) Ag 焊接石墨烯框架用于封装聚乙二醇 (PEG) 作为相变材料 (PCM) 复合材料。由于通过银焊接降低石墨烯骨架中的界面热阻 (ITR) 和垂直取向的石墨烯骨架作为声子传输路径，所获得的 PCM 复合材料表现出 4.3 W m ^-1  K ^{-1的高导热率}石墨烯负载量约为 6.25 vol%，显着提高了充放电过程中的传热速率。同时，石墨烯骨架赋予了 PCM 复合材料优异的太阳能热转换能力，这可以通过 Ag 焊接策略进一步增强。此外，具有巨大毛细管力和表面张力的3D多孔骨架有效地提高了形状稳定性并避免了PCM的泄漏，同时保持了高储能容量（147.4-165.9 J g ^-1）。因此，银焊接 3D 石墨烯框架揭示了在太阳能热转换领域中封装 PCM 的高潜力。