Fabrication of Silicone Rubber/MXene/Onion‐Like Carbon Dielectric Elastomer Composites With Enhanced Dielectric and Actuation Performances Under Low Electric Field Without Prestretching

Dielectric elastomers (DEs) have shown broad application prospects in actuators, generators, bionic robots and other fields due to their muscle‐like driving effect under external electric fields. Nevertheless, conventional DEs demand high electric fields and prestretching to achieve effective deformation. In this paper, silicone rubber (SR)/MXene/onion‐like carbon (OLC) composites that can achieve high driving performance under low electric field without prestretching were reported. By adjusting the content ratio of MXene and OLCs, the dispersibility of the fillers in SR was optimized, and the composites retained excellent thermal stability with the decomposition temperature approaching 400 °C. The SR composite containing 1 wt% MXene and 1 wt% OLCs exhibited a dielectric constant of 7.86 with a low dielectric loss of 0.00137 at 10 3 Hz, and significantly enhanced mechanical properties with an elastic modulus reduced to 334 kPa. Moreover, it achieved an actuated strain of 12.36% without prestretching under an electric field of 35.78 kV mm −1 , which was 55.08% higher than that of pure SR. This work delivers an appealing strategy toward fabricating high‐performance DEs.