Efficient thermal management and electromagnetic interference (EMI) shielding are critical challenges for the reliable operation of portable electronic devices. Herein, we report the design and fabrication of multifunctional layered composite phase change materials (CPCMs) comprising alternating cellulose nanofiber/phase change capsule/sodium alginate (CNF/PCC/SA) layers and MXene/sodium alginate (MXene/SA) layers. The strong interfacial adhesion and controlled multilayer architecture enable the CPCM to achieve high electrical conductivity (up to 279.8 S/cm) and excellent EMI shielding effectiveness (up to 57.6 dB in the X-band). The layered structure enhances electromagnetic wave attenuation via multiple internal reflections and polarization losses, outperforming homogeneous composites. Moreover, the CPCMs exhibit superior light absorption (maximum nearly 100% for the optimized 5-layer structure) and efficient light-to-thermal conversion, achieving rapid temperature increases and uniform heat distribution under light irradiation. Additionally, the phase change capsules enable latent heat storage, ensuring thermal buffering and prolonged temperature regulation. This work provides novel insights into the rational design of multifunctional composites integrating wireless thermal management and EMI shielding, with promising applications in wearable electronics and smart thermal regulation.

In this study, BP@ZIF-67 (BZ), a special heterostructural nanofiller, was innovatively constructed by growing ZIF-67 in situ on black phosphorus (BP) nanosheets, and introduced it into the waterborne epoxy resin (WEP) coating. In addition, only 0.4 wt.% BZ nanofiller needs to be introduced to give the WEP coating an excellent overall performance improvement. After 42-day of immersion in 3.5 wt.% NaCl solution, the impedance modulus of 4-BZ/WEP in the low frequency region of 0.01 Hz (|Z_{0.01 Hz}|) jumped two orders of magnitude compared to the pure WEP coating, showing a strong corrosion protection barrier effect; The wear rate of the 4-BZ/WEP coating is greatly reduced by 89.98% compared to the blank WEP coating, and the wear resistance has been qualitatively improved. And compare with the blank WEP coating, the peak heat release rate (PHRR) of the 4-BZ/WEP coating is reduced by 10.22%, effectively improving the fire safety and thermal stability of the material. The strategy of using BP nanosheets and ZIF-67 to construct multifunctional nanofillers provides a promising new way for the development of high-performance waterborne epoxy composite coatings that integrate long-term corrosion protection, high wear resistance and good flame retardancy.