Engineering multilayered MXene/electrospun poly(lactic acid) membrane with increscent electromagnetic interference (EMI) shielding for integrated Joule heating and energy generating

Proliferous bloom of wearable electronics arouses higher demands on electromagnetic pollution defense and multifunctional trait. Yet the EMI shielding materials capable of versatility still remains a challenge. Herein, the multilayered MXene/PLA composite membrane was designed with increscent EMI shielding by alternately assembling MXene onto electrospun poly(lactic acid) (PLA) nanofiber mats. Attributing to the intact conduction of MXene layer and the multiple-reflection-absorption effect, the multilayered membrane achieved an optimum shielding efficiency (SE) of 55.4 dB. The predominant conductivity of MXene rendered the multilayered membrane remarkable Joule heating performance with a rapid temperature response from 31 °C to 52.8 °C within 25s at a low trigger voltage of 1.5 V. The triboelectric nanogenerator (TENG) based on the multilayered membrane exhibited outstanding energy generation with a peak power density of 457.1 mW/m2. This work provides a feasible pathway to prepare high-performance bio-based EMI shielding membranes and gives insights into the design of highly integrated multifunctional devices.