Conceptual Circuit Model for the Prediction of Electrochemical Performance of Carbonaceous Electrodes Containing Reduced Ultra Large Graphene Oxide

Abstract

A concneptual model based on the physics of electrode components has been proposed for the prediction of the electrochemical behavior of carbonaceous electrode composites containing reduced ultra large graphene oxide (RUGO). RUGO has been used as one of the main components of capacitive deionization (CDI) electrode composites including activated carbon (AC) and carbon nanotubes (CNT). An optimal composition of the CDI electrode materials was determined that resulted in a high ion adsorption capacity of 10.51 mg g−1 @ 1.1 V in the absence of pseudo-capacitive materials. Using small amounts of RUGO (total RUGO and CNT’s content less than 10 wt%) in the CDI electrodes led to relatively high electrochemical capacitance and ion adsorption capacity. The electrochemical impedance spectroscopy and CDI experiments were in reasonable accordance with the mathematical model results.