Intrinsically Stretchable MXene-Silver Nanowires Composite Electrodes for Wearable Supercapacitors

To synergistically improve the energy storage capacity and mechanical flexibility of wearable energy storage devices, a facile method to realize intrinsic stretchable AgNWs-bridged MXene porous electrode, especially for enabling the fabrication of microwearable supercapacitors with high resolution, is developed in this work. The continuous AgNWs network provides more abundant and lower resistivity electron and ion transport channels, while improving the stretchability of MXene electrodes intrinsically to accommodate bending and stretching strains. The AgNWs-bridged MXene porous electrode exhibits a capacitance of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$287~\text {F}\cdot \text { cm}^{-{3}}$ </tex-math></inline-formula> when works as a negative electrode, excellent cycle stability (more than 92% retention after 5000 cycles), and out-standing intrinsically stretchability (96.3% retention after stretching strain of 50%). Even after 100 cycles of 20% stretching deformation, the capacitance retention rate is still above 97%, which proves the stability of the AgNWs-bridged MXene porous electrode and shows great potential in wearable and flexible electronics.