Laser-Assisted Rapid Fabrication of Cobalt Hydroxide@Carbon Fiber Composites for High-Performance, Robust Structural Supercapacitors

초록

Conventional supercapacitor electrodes often rely on time-consuming hydrothermal methods to create nanostructures. In this study, a laser-assisted process was utilized to fabricate cobalt hydroxide on a carbon fiber (CF) composite, achieving a mechanically stable structural capacitor (SSC) within 50 min. Intensive CO<inf>2</inf> laser irradiation facilitated the rapid deposition and growth of diverse nanoarchitectures on the CF substrate. The outstanding performance of the Co(OH)<inf>2</inf>@CF electrode was demonstrated by its rate capability, with a cyclic stability of 96.3% maintained through 15,000 cycles and a Coulombic efficiency of 99.5%. A high specific capacitance of 1448.20 F g-1 was also observed. The unique morphology of the Co(OH)<inf>2</inf>@CF electrode enabled efficient charge storage with a high diffusion contribution, even at 50 mV s-1. The robust SSC device remained stable under external forces and thus showed promise in addressing the sensitivity issues encountered with current supercapacitor devices. © 2024 American Chemical Society.

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