The rapid development of integrated electronics and the boon in portable devices have increased the demand for miniaturized and on-chip energy storage units. Micro-supercapacitors (MSCs) with planar interdigitated architectures could be readily integrated into on-chip miniaturized electronics. Here we fabricate quasi-solid state MSCs with cellular graphene film as the active material and polyvinyl alcohol (PVA)/H3PO4 as the gel electrolyte. The 3D porous graphene films not only serve as high performance supercapacitor electrodes, but also provide an abundant ion reservoir for the gel electrolyte. We systematically compare the electrochemical performance of the planar interdigitated MSCs to the multi-layered structure of traditional supercapacitors. The quasi-solid state MSCs exhibit excellent performances, including high areal capacitance up to 1.7 mF cm-2 based on the area of the total device, while maintaining 0.9 mF cm-2 (53%) capacitance even when the scan rate was increased up to 1 V s-1. The quasi-solid state device retained about 89.4 % of its initial capacitance after 1,000 cycles while tested under repeated bending from 0° to 120°. In addition, the cellular graphene film based MSCs exhibited 0.34 μWh cm-2 of energy density and 5.3 mW cm-2 of power density in an aqueous electrolyte and 0.22 μWh cm-2 of energy density and 0.37 mW cm-2 of power density in a gel electrolyte. This research sheds light on using 3D porous films for flexible micro-patterned devices with broad applications.

中文翻译：

---

基于细胞石墨烯薄膜的柔性准固态平面微型超级电容器

集成电子产品的快速发展和便携式设备的发展已经增加了对小型化和片上储能单元的需求。具有平面叉指式架构的微型超级电容器（MSC）可以很容易地集成到片上小型电子设备中。在这里，我们以细胞石墨烯薄膜为活性材料，以聚乙烯醇（PVA）/ H3PO4为凝胶电解质，制备了准固态MSC。3D多孔石墨烯膜不仅可以用作高性能超级电容器电极，还可以为凝胶电解质提供丰富的离子库。我们系统地比较了平面交叉指型MSC与传统超级电容器的多层结构的电化学性能。准固态MSC具有出色的性能，包括高达1的高面电容。基于整个器件的面积为7 mF cm-2，即使将扫描速率提高到1 V s-1，也可以保持0.9 mF cm-2（53％）的电容。在从0°到120°的反复弯曲下进行测试时，准固态器件在经过1000次循环后仍保留了其初始电容的约89.4％。另外，基于蜂窝状石墨烯膜的MSC在水性电解质中表现出0.34μWhcm-2的能量密度和5.3mW cm-2的功率密度，在水电解质中表现出0.22μWhcm-2的能量密度和0.37mW cm-2的功率密度。凝胶电解质。这项研究为将3D多孔膜用于具有广泛应用的柔性微图案设备提供了启示。在从0°到120°的反复弯曲下进行1000次循环测试后，其初始电容的4％。另外，基于蜂窝状石墨烯膜的MSC在水性电解质中表现出0.34μWhcm-2的能量密度和5.3mW cm-2的功率密度，在水电解质中表现出0.22μWhcm-2的能量密度和0.37mW cm-2的功率密度。凝胶电解质。这项研究为将3D多孔膜用于具有广泛应用的柔性微图案设备提供了启示。在从0°到120°的反复弯曲下进行1000次循环测试后，其初始电容的4％。另外，基于蜂窝状石墨烯膜的MSC在水性电解质中表现出0.34μWhcm-2的能量密度和5.3mW cm-2的功率密度，在水电解质中表现出0.22μWhcm-2的能量密度和0.37mW cm-2的功率密度。凝胶电解质。这项研究为将3D多孔膜用于具有广泛应用的柔性微图案设备提供了启示。