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首页> 外文期刊>Advanced energy materials >Miniaturized Supercapacitors: Focused Ion Beam Reduced Graphene Oxide Supercapacitors with Enhanced Performance Metrics
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Miniaturized Supercapacitors: Focused Ion Beam Reduced Graphene Oxide Supercapacitors with Enhanced Performance Metrics

机译：小型化超级电容器：聚焦离子束减少的氧化石墨烯超级电容器，具有增强的性能指标

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摘要

Miniaturization of energy storage devices with enhanced performance metrics can reduce the footprint of microdevices being used in our daily life. Micro-­supercapacitor architectures with planar geometry provides several advantages, such as, the ability to control and reduce the distances ions travel between two electrodes, easy integration to microdevices, and offer the potential of being extended into 3D without compromising the interelectrode distances. Here, focused ion beam (FIB) technology is used to directly write miniaturized planar electrode systems of reduced graphene oxide (FIB-rGO) on films of graphene oxide. Using optimized ion beam irradiation, interdigitated FIB-rGO electrode designs with 40 μm long and 3.5 μm wide fingers with ultrasmall interelectrode spacing of 1 μm demonstrate a large capacitance (102 mF cm−2), ultrasmall time response (0.03 ms), low equivalent series resistance (0.35 mΩ cm2), and retain 95% of the capacitance after 1000 cycles at an ultrahigh current density of 45 mA cm−2. These performance metrics show remarkable improvements on several counts of supercapacitor performance over existing reports due to the miniaturized electrode dimensions and minimal damage to the graphene sheets. It is believed that these results can provide avenues for large-scale fabrication of arrayed, planar, high-performance micro-supercapacitors with a small environmental footprint.
机译：具有增强的性能指标的能量存储设备的小型化可以减少我们日常生活中使用的微型设备的占地面积。具有平面几何形状的微型超级电容器架构具有多个优势，例如控制和减少离子在两个电极之间传播的距离，易于集成到微型设备的能力以及提供扩展到3D而不损害电极间距离的潜力。在这里，聚焦离子束（FIB）技术用于在氧化石墨烯薄膜上直接写入还原型氧化石墨烯（FIB-rGO）的小型平面电极系统。使用优化的离子束辐照，指状FIB-rGO电极设计具有40μm长和3.5μm宽的手指，极小的电极间间距为1μm，显示出大电容（102 mF cm-2），超小时间响应（0.03 ms），低等效串联电阻（0.35mΩcm2），并在45 mA cm-2的超高电流密度下经过1000次循环后仍保持95％的电容。这些性能指标显示，由于电极尺寸小型化和对石墨烯片的破坏最小，因此与现有报告相比，超级电容器性能在多个方面都有了显着提高。相信这些结果可以为大规模制造具有较小环境足迹的阵列的，平面的，高性能的微型超级电容器提供途径。

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