Lee Sang Hwa, Lee Jungjun, Jung Jaemin, Cho A Ra, Jeong Jae Ryeol, Dang Van Cu, Nah Junghyo, Lee Min Hyung
Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi 17104, Korea.
Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea.
ACS Appl Mater Interfaces. 2021 Apr 28;13(16):18821-18828. doi: 10.1021/acsami.1c02102. Epub 2021 Apr 14.
The evolution of "smart life," which connects all internet-of-things (IoT) microdevices and microsensors under wireless communication grids, requires microscale energy storage devices with high power and energy density and long-term cyclability to integrate them with sustainable power generators. Instead of Li-ion batteries with a short lifetime, pseudocapacitors with longer or infinite cyclability and high-power density have been considered as efficient energy storage devices for IoT. However, the design and fabrication of microscale pseudocapacitors have difficulties in patterning microscale electrodes when loading active materials at specific points of the electrodes using conventional microfabrication methods. Here, we developed a facile, one-step fabrication method of micro-supercapacitors (MSCs) through the in situ formation of Co metals and the reduced graphene oxides (rGOs) in a one-pot laser scribing process. The prepared Co/rGO MSC thus exhibited four times higher capacitance than the rGO MSC, due to the Faradaic charge capacitance behavior of the Co/rGO composites.
“智能生活”的发展将所有物联网（IoT）微型设备和微传感器连接在无线通信网络之下，这就需要具有高功率、高能量密度和长期循环稳定性的微型储能设备，以便将它们与可持续的发电机集成在一起。具有较长或无限循环稳定性以及高功率密度的赝电容器，而非寿命较短的锂离子电池，已被视为物联网的高效储能设备。然而，当使用传统微加工方法在电极的特定点加载活性材料时，微型赝电容器的设计和制造在微尺度电极的图案化方面存在困难。在此，我们通过在一锅激光刻划过程中原位形成钴金属和还原氧化石墨烯（rGO），开发了一种简便的微超级电容器（MSC）一步制造方法。由于Co/rGO复合材料的法拉第电荷电容行为，制备的Co/rGO MSC的电容比rGO MSC高四倍。
