Redox enhanced energy storage in an aqueous high-voltage electrochemical capacitor with a potassium bromide electrolyte
By Li, Qi; Haque, Mazharul; Kuzmenko, Volodymyr; Ramani, Namrata; Lundgren, Per; Smith, Anderson D.; Enoksson, Peter
Published in Journal of Power Sources
2017
Abstract
Abstract This paper reports a detailed electrochemical investigation of a symmetric carbon-carbon electrochemical device with a potassium bromide (KBr) electrolyte. Below 1.6 V, {KBr} gives electrochemical double layer behavior. At higher voltages the Br ? / Br 3 ? redox reaction comes into effect and enhances the energy storage. The redox-enhanced device has a high energy density, excellent stability, as well as high coulombic and energy efficiencies even at 1.9 V. More importantly, the redox contribution can be