A Conformal Active-Material Loading Strategy for Designing High-Performance Planar Microsupercapacitors
Dong‐Dong Han, Ye-Can Zhang, Jichao Li, Hao Zhou, Jiang‐Wei Mao, Yong‐Lai Zhang, Hong‐Bo Sun
Abstract
Microsupercapacitors (MSCs) show promise for use in wearable electronics for biomedical, consumer, and military applications. However, the development of innovative engineering technologies that enable high-capacity loading of active materials on the MSCs is still challenging. In this work, we report a conformal active-material loading strategy for developing high-performance planar MSCs based on stereoscopic carbon electrodes produced via direct laser writing (DLW). Oxidized laser-induced graphene (LIG-O) was prepared by combining laser-induced pyrolysis of polyimide (PI) and oxygen plasma-induced oxidation. The resultant LIG-O electrodes showed well-defined micropatterns, protuberant stereoscopic structures, high porosities, and superhydrophilicity. The combined effects enabled high-capacity loading of active materials (e.g., NiFe layered double hydroxide) on the stereoscopic carbon electrodes in a conformal manner, which contributed to a 10-fold improvement in the areal capacitances of the planar MSCs. In addition, the resultant flexible planar MSCs served as energy storage devices to power a flexible ink display system. This work will open new avenues for developing high-performance planar MSCs.