NiO Nanoparticles\nAnchored on N‑Doped Laser-Induced\nGraphene for Flexible Planar Micro-Supercapacitors

Abstract

As an energy storage component of wearable electronics,\nplanar\nmicro-supercapacitors (MSCs) hold great advantages in terms of flexibility,\nminiaturization, and integration. However, the preparation process\nof MSCs is rather cumbersome. A simple, fast, and efficient technique\nfor preparing MSCs is still of strong desirability. Herein, a fast\nand efficient laser direct writing technique is proposed to in situ\nfabricate NiO nanoparticles anchored on N-doped laser-induced graphene\n(NiO/NLIG) composite electrodes on account of the formation principle\nof the polyimide (PI) film, which are subsequently assembled into\nhigh-performance flexible planar MSCs. The as-assembled NiO/NLIG MSCs\ncan achieve a remarkable areal specific capacitance of 25.11 mF cm^–2, a superior energy density of 1.88 mW h cm^–2 at a high power density of 0.02 mW cm^–2, excellent\nbendability, and good cycling performance. Furthermore, due to advantages\nof consistency and stability of laser direct writing, the proposed\nhigh-performance planar NiO/NLIG MSCs with consistency and stability\ncan be easily modularized and integrated to provide customized requirements\nand are the most promising crucial micro-power energy storage components\nfor flexible integrated electronics.