ScholarWorks@성균관대학교

초록

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 MoS2/graphene cathode and activated carbon anode. The MoS2/graphene nanocomposites were synthesized via a hydrothermal method, leveraging the synergistic effect of pseudocapacitive MoS2 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 MoS2-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.

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