PEDOT-MnO2/rV2O5@graphene nanocomposite electrode-based stretchable micro-supercapacitor array with T-joint-cut kirigami structure

Kirigami structure has been employed to improve the stretchability of a planar functional electrode used in the wearable smart electronics. However, the preparation of the functional sheet-based stretchable device is still challenging due to the limited out-of-plane displacement of the typical kirigami structure and poor electronic performance. Here, we developed the high-performance binary metal oxide nanocomposite electrode-based micro-supercapacitors (MSCs). As combinatorial enhancement strategies to realize highly stretchable non-protruding electrode structure against external mechanical stress, the T-joint-cut kirigami structure and PEDOT-MnO₂/rV₂O₅@GF nanocomposite ink are used to fabricate the MSCs. We demonstrate that the stretchable MSC array composed of 3 × 4 unit cells exhibits the specific capacitance of 25 F g⁻¹ at 0.208 A g⁻¹ and can be stretched up to 20 % strain (76 % of original capacitance is retained after 5000 stretching/releasing cycles) without out-of-plane protrusions. Therefore, our MSC array with T-joint-cut kirigami pattern could be a potentially powerful tool for energy storage system applications.