Multifunctional C/TiO <sub>2</sub> from MXene/Polyaniline for Electromagnetic Protection and Supercapacitor
Xiaodan Xu, Yanxiang Wang, Chengjuan Wang, Bowen Cui, Chengguo Wang
Abstract
Enormous endeavors have been made to cope with microwave pollution and energy crisis. Here, porous nitrogen-doped C/TiO 2 composites with absorption/shielding/supercapacitor functions were derived from MXene/polyaniline. It was discovered that KOH acted as porogen and had an etching–bridging–reaction effect during the activation process. As a microwave absorber, the composite/paraffin with a filler loading of 16 wt% reaches a minimum reflection loss of −52.8 dB and an effective absorption bandwidth of 4.72 GHz. Moreover, microwave absorption can be maintained within 45 days in air. Compared with untreated MXene, the absorber shows long-term functional stability in an oxygen-containing environment. As for electromagnetic interference shielding, the composite/paraffin at a filler loading of 50 wt% achieves 30.5 dB from 8.0 to 12.4 GHz. Additionally, the heterostructure delivers a desirable specific capacitance of 1,096.3 F g −1 at 0.5 A g −1 . The trifunctional characteristics enrich the application trials of MXene derivatives and satisfy the strong need for versatile materials.