This article presents a breakthrough composite phase change material (CPCM) featuring a three-dimensional (3D) reduced graphene oxide (rGO)/MXene scaffold. Through magnetic-field-assisted self-assembly, highly dispersed Fe3O4 nanoparticles (NPs) are precisely anchored between the MXene layers and graphene oxide surfaces via hydrogen bonding. The resulting rGO/MXene@Fe3O4 framework is then infused with polyethylene glycol (PEG) through vacuum impregnation, creating a multifunctional system that synergistically integrates photothermal conversion, microwave absorption, and infrared stealth capabilities. The optimized CPCM demonstrates outstanding PEG adsorption capacity (>95%) while maintaining superior thermal properties. Its melting and crystallization enthalpies are 176.87 and 171.66 J g–1, respectively, and it exhibits 62% thermal conductivity enhancement relative to that of pure PEG. By leveraging the heterogeneous interfaces formed through rGO/MXene interactions, the composite achieves a record photothermal conversion efficiency of 96.7%. The synergistic effect of the Fe3O4 NPs further elevates magnetic loss and impedance matching, resulting in an exceptional microwave absorption performance with a minimum reflection loss of −51.98 dB at 9.9 mm thickness. Dynamic thermal analysis reveals a rapid infrared stealth response (25.4 °C temperature increase within 50 s) and exceptional cycling stability, underscoring its potential for advanced applications in thermal regulation, electromagnetic interference shielding, and energy conversion systems.
Li et al. (Mon,) studied this question.