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首页> 外文期刊>Advanced Functional Materials >Flexible All-Solid-State Supercapacitors of High Areal Capacitance Enabled by Porous Graphite Foams with Diverging Microtubes
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Flexible All-Solid-State Supercapacitors of High Areal Capacitance Enabled by Porous Graphite Foams with Diverging Microtubes

机译：多孔石墨泡沫与分散微管实现的高面积电容的柔性全固态超级电容器

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摘要

The practical applications of wearable electronics rely on the successful development of flexible and integrable energy devices with small footprints. This work reports a completely new type of graphite foam made of strategically created superstructures with covalently attached diverging microtubes, and their applications as electrode supports for binder-free and additive-free flexible supercapacitors. Because of the enhanced volumetric surface areas compared to conventional graphite foams, a high loading of pseudocapacitive materials (Mn3O4, 3.91mg cm(-2), 78 wt%) is achieved. The supercapacitors provide areal capacitances as high as 820 mF cm(-2) at 1mV s(-1), while still maintaining high rate capability and 88% retention of capacitance after 3000 continuous charging and discharging cycles. When assembled as all-solid-state flexible symmetric supercapacitors, they offer one of the highest full-cell capacitances (191 mF cm(-2)) among similar manganese oxide/graphene foams, and retain 80% capacitance after 1000 mechanical cycles. The potential of such flexible supercapacitors is also manifested by directly powering electric nanomotors that can trace along letters U and T, which is the first demonstration of flexible supercapacitors for wireless/portable nanomanipulation systems. This work could inspire a new paradigm in designing and creating 3D porous microanosuperstructures for an array of self-powered electronic and nanomechanical applications.
机译：可穿戴电子设备的实际应用依赖于成功开发出占地面积小的柔性和可集成能源设备。这项工作报告了一种完全新型的石墨泡沫，该石墨泡沫由具有战略意义的上部结构和共价连接的发散微管组成，并已用作无粘合剂和无添加剂的柔性超级电容器的电极载体。与常规石墨泡沫相比，由于增加了体积表面积，因此可以实现高负载的假电容材料（Mn3O4、3.91mg cm（-2），78 wt％）。超级电容器在1mV s（-1）时可提供高达820 mF cm（-2）的面电容，同时在3000个连续的充电和放电循环后仍保持高倍率能力和88％的电容保持率。当组装为全固态柔性对称超级电容器时，它们可提供类似氧化锰/石墨烯泡沫中最高的全电池电容之一（191 mF cm（-2）），并在1000次机械循环后保持80％的电容。这种柔性超级电容器的潜力还通过直接驱动可以沿字母U和T跟踪的电动纳米马达来体现，这是用于无线/便携式纳米操纵系统的柔性超级电容器的首次演示。这项工作可以为设计和创建用于一系列自供电电子和纳米机械应用的3D多孔微/纳米超结构激发新的范例。

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