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High-Performance Microsupercapacitors Based on Two-Dimensional Graphene/Manganese Dioxide/Silver Nanowire Ternary Hybrid Film

机译:基于二维石墨烯/二氧化锰/银纳米线三元杂化膜的高性能微型超级电容器

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摘要

Microsupercapacitors (MSCs), as one type of significant power source or energy storage unit in microelectronic devices, have attracted more and more attention. However, how to reasonably design electrode structures and exploit the active materials to endow the MSCs with excellent performances in a limited surface area still remains a challenge. Here, a reduced graphene oxide (RGO)/manganese dioxide (MnO2)/silver nanowire (AgNW) ternary hybrid film (RGMA ternary hybrid film) is successfully fabricated by a facile vacuum filtration and subsequent thermal reduction, and is used directly as a binder-free electrode for MSCs. Additionally, a flexible, transparent, all-solid state RMGA-MSC is also built, and its electrochemical performance in an ionic liquid gel electrolyte are investigated in depth. Notably, the RGMA-MSCs display superior electrochemical properties, including exceptionally high rate capability (up to 50000 mV.s(-1)), high frequency response (very short corresponding time constant tau(0) = 0.14 ms), and excellent cycle stability (90.3% of the initial capacitance after 6000 cycles in ionic liquid gel electrolyte). Importantly, the electrochemical performance of RGMA-MSCs shows a strong dependence on the geometric parameters including the interspace between adjacent fingers and the width of the finger of MSCs. These encouraging results may not only provide important references for the design and fabrication of high-performance MSCs, but also make the RGMA ternary hybrid film promising for the next generation film lithium ion batteries and other energy storage devices.
机译:背景技术作为超级电子设备中重要的电源或能量存储单元的一种类型的微型超级电容器(MSC)受到越来越多的关注。然而,如何合理设计电极结构并利用活性材料在有限的表面积内赋予MSC优异的性能仍然是一个挑战。在这里,通过简便的真空过滤和随后的热还原成功地制备了还原氧化石墨烯(RGO)/二氧化锰(MnO2)/银纳米线(AgNW)三元杂化膜(RGMA三元杂化膜),并直接用作粘合剂MSC的无电极。另外,还构建了柔性,透明的全固态RMGA-MSC,并深入研究了其在离子液体凝胶电解质中的电化学性能。值得注意的是,RGMA-MSC具有优异的电化学性能,包括极高的速率能力(高达50000 mV.s(-1)),高频响应(非常短的对应时间常数tau(0)= 0.14 ms)和出色的循环性能稳定性(离子液体凝胶电解质在6000次循环后的初始电容的90.3%)。重要的是,RGMA-MSC的电化学性能显示出对几何参数的强烈依赖性,包括相邻指状物之间的间隔和MSC指状物的宽度。这些令人鼓舞的结果可能不仅为高性能MSC的设计和制造提供重要参考,而且使RGMA三元混合薄膜有望用于下一代薄膜锂离子电池和其他储能设备。

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