Current progress and frontiers in three-dimensional macroporous carbon-based aerogels for electromagnetic wave absorption: A review

In the present era of rapid development in electronic information technology, electromagnetic (EM) pollution is increasingly receiving widespread concerns due to its potential threats to electronic devices and human health. EM wave absorbing materials (EWAMs) play an increasingly important role in preventing exposure to EM waves because they can attenuate incident EM waves through sustainable energy dissipation. Among the numerous EWAMs developed in recent years, three-dimensional (3D) macroporous carbon-based aerogels have been considered one of the most promising candidates as high-performance EWAMs not only due to their flexible component options and the beneficial synergies between their different components but also for their open skeletons, which provide a unique structural contribution to accelerating the consumption of EM waves. In this review, we focus on the current progress of 3D macroporous carbon-based aerogels toward EM absorption and highlight different strategies for their preparation, including biomass transformation, template method, hydrothermal/solvothermal self-assembly, polymer foaming, and metal-organic frameworks (MOFs) topological transformation. Moreover, we discuss and analyze the effects of composition, optimization and structural engineering on their EM absorption performances. After a comprehensive evaluation of the performance of 3D macroporous carbon-based aerogels, we further propose some challenges and perspectives for the development of 3D macroporous carbon-based aerogels, and envision their broad application prospects in the future.