Flower-like MoS2/graphene nanocomposite for scalable fabrication of high-performance flexible all-solid-state asymmetric micro-supercapacitor

Micro-supercapacitors are crucial for integrating energy storage into increasingly complex electronic systems, e.g., consumer and wearable electronics, which require appropriate miniaturization. We report here a scalable and cost-effective process to produce an all-solid-state asymmetric micro-supercapacitor based on nanostructured flower-like MoS 2 /graphene cathode and activated carbon anode. The MoS 2 /graphene nanocomposites were synthesized via a hydrothermal method, leveraging the synergistic effect of pseudocapacitive MoS 2 and highly conductive graphene to enhance electrode capacitance and cycling stability. Facile bar-coating and laser cutting techniques were employed to fabricate the asymmetric micro-supercapacitor. The device has a stable operating voltage of 1.6 V, and achieves an impressive area capacitance of 183.7 mF cm −2 , and a maximum area energy density of 65.3 mWh cm −2 , which is the highest areal energy density among MoS 2 -based micro-supercapacitors. In addition, the device exhibits outstanding cycling durability with 94% capacitance retention after 10,000 charge−discharge cycles. The electrochemical performance remains stable under various bending conditions, demonstrating the device's exceptional mechanical flexibility, thereby advancing its practical application as a power source in next-generation wearable technologies.