Abstract
Flexible supercapacitors (FSCs) are promising energy suppliers for the emerging wearable devices. Because of the limited human body surface area, it is vital to prepare a flexible electrode with high areal performance. To address this challenge, we propose a facile hydrochloric acid (HCl) solvothermal strategy to fabricate high areal performance chlorine-doped reduced graphene oxide films (Cl-RGOFs). Owing to the electron-withdrawing effect induced by the doped Cl atoms and reducibility of HCl, the electrical conductivity of Cl-RGOF enhanced 2.5 times compared with the pristine-reduced graphene oxide film, which effectively decreased internal resistance, ensuring impressive capacitive performance. As a result, Cl-RGOF exhibits near-linear growth of specific areal capacitance with the increasing of mass loading to the commercial level. For flexible solid-state supercapacitors (FSSCs), Cl-RGOFs with 11 mg cm–2 mass loading present high areal capacitance of 2312 mF cm–2 and 78.7% capacitance retention from 1 to 20 mA cm–2. The FSSC shows a high areal energy density of 160.6 μW h cm–2 at the power density of 0.5 mW cm–2. Besides, the FSSC also shows stable capacitance at different bending angles or after 500-times bending, demonstrating high flexibility and practicality. This strategy provides a new path for the preparation of high areal performance FSC for wearable devices.
Published Version
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