Enhancing the capacity of activated carbon electrodes by a redox mediator pair for the fabrication of flexible asymmetric solid-state supercapacitors

We use a redox mediator pair - hydroquinone (for positive electrode) and sodium anthraquinone-2-sulfonate (for negative electrode) - to treat the activated carbon electrodes for fabricating asymmetric supercapacitors. This simple adsorption-based treatment improves the specific capacity of the activated carbon electrode from 69.3 mAh g−1 to 300.4 mAh g−1 (negative electrode) and 63.5 mAh g−1 to 301.1 mAh g−1 (positive electrode). The charge...