2D Tantalum Disulfide Reduction Strategy Customized Ta ₂ O ₅ /rGO Heterointerface Aerogel Toward Boosting Electromagnetic Wave Absorption and Flame Retardancy

The exceptional and substantial electron affinity, as well as the excellent chemical and thermal stability of transition metal oxides (TMOs), infuse infinite vitality into multifunctional applications, especially in the field of electromagnetic wave (EMW) absorption. Nonetheless, the suboptimal structural mechanical properties and absence of structural regulation continue to hinder the advancement of TMOs‐based aerogels. Herein, a novel 2D tantalum disulfide (2H‐TaS 2 ) reduction strategy is demonstrated to synthesize Ta 2 O 5 /reduced graphene oxide (rGO) heterointerface aerogels with unique characters. As the prerequisite, the defects, interfaces, and configurations of aerogels are regulated by varying the concentration of 2H‐TaS 2 to ensure the Ta 2 O 5 /rGO heterointerface aerogels with appealing EMW absorption properties such as a minimum reflection loss (RL min ) of −61.93 dB and an effective absorption bandwidth (EAB) of 8.54 GHz (7.80−16.34 GHz). This strategy provides valuable insights for designing advanced EMW absorbers. Meanwhile, the aerogel exhibits favorable thermal insulation performance with a value of 36 mW m −1 K −1 , outstanding fire resistance capability, and exceptional mechanical energy dissipation performance, making it promising for applications in the aerospace industry and consumer electronics devices.