Department of Materials Science and Engineering , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States.
ACS Appl Mater Interfaces. 2018 Jul 5;10(26):22303-22310. doi: 10.1021/acsami.8b06235. Epub 2018 Jun 21.
Printed graphene microsupercapacitors (MSCs) are attractive for scalable and low-cost on-chip energy storage for distributed electronic devices. Although electronic devices have experienced significant scaling to smaller formats, the corresponding miniaturization of energy storage components has been limited, with a typical resolution of ∼30 μm for printed graphene patterns to date. Transfer printing is demonstrated here for patterning graphene electrodes with fine line and spacing resolution less than 5 μm. The resulting devices exhibit an exceptionally small footprint (∼0.0067 mm), which provides, to the best of our knowledge, the smallest printed graphene MSCs. Despite this, the devices retain excellent performance with a high areal capacitance of ∼6.63 mF/cm along with excellent electrochemical stability and mechanical flexibility, resulting from an efficient nonplanar electrode structure and an optimized two-step photoannealing method. As a result, this miniaturization strategy facilitates the on-chip integration of printed graphene MSCs to power emerging electronic devices.
印刷石墨烯微超级电容器（MSCs）对于分布式电子设备的可扩展和低成本片上储能具有吸引力。尽管电子设备已经经历了向更小尺寸的显著缩放，但储能组件的相应小型化受到限制，迄今为止，印刷石墨烯图案的典型分辨率约为 30 μm。本文展示了用于图案化具有小于 5 μm 的细线和间距分辨率的石墨烯电极的转印技术。所得器件具有非常小的足迹（约 0.0067 mm），据我们所知，这是最小的印刷石墨烯 MSCs。尽管如此，由于高效的非平面电极结构和优化的两步光退火方法，器件仍具有出色的性能，具有约 6.63 mF/cm 的高面电容以及出色的电化学稳定性和机械灵活性。因此，这种小型化策略有助于将印刷石墨烯 MSCs 集成到片上，以为新兴电子设备供电。
