Supercapacitors play a crucial role in energy storage field in virtue of their high power density. However, their flexibility and energy density are still challenging to be improved for wearable electronics and other applications. Herein, carbon cloth (CC) is used as flexible substrate to incorporate NiO nanoparticles with a hydrothermal method, and to coat with graphene by a dip-coating treatment. The NiO with high redox activity and CC with excellent flexibility and conductivity enable fast ionic/charge transfer characteristics and superior electrochemical performances. Moreover, the flexible asymmetric supercapacitors (FASCs) are assembled, demonstrating a large potential window of 1.5 V, a high energy density of 33.1 Wh kg(-1) at the power density of 750.0 W kg(-1), a high capacitance retention of 92.6 after 10,000 cycles, and good flexibility. This work demonstrates great potential of the as-fabricated FASCs for future flexible wearable energy storage devices.
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机译：超级电容器凭借其高功率密度在储能领域发挥着至关重要的作用。然而，对于可穿戴电子产品和其他应用来说，它们的灵活性和能量密度仍然具有挑战性。本文以碳布（CC）为柔性基材，以水热法掺入NiO纳米颗粒，并通过浸涂处理涂覆石墨烯。具有高氧化还原活性的NiO和具有优异柔韧性和导电性的CC可实现快速的离子/电荷转移特性和卓越的电化学性能。此外，该器件还组装了柔性非对称超级电容器（FASC），表现出1.5 V的大电位窗口、33.1 Wh kg（-1）的高能量密度、750.0 W kg（-1）的功率密度、10,000次循环后92.6%的高电容保持率和良好的柔韧性。本研究展示了FASCs在未来柔性可穿戴储能器件中的巨大潜力。
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