2D MXenes: Assembling 2D MXenes into Highly Stable Pseudocapacitive Electrodes with High Power and Energy Densities (Adv. Mater. 8/2019)

Abstract

flexible and freestanding films of 2D vanadium carbide MXene (V2CTx) are prepared by Majid Beidaghi and co‐workers and used as pseudocapacitive electrodes. The assembled films show excellent chemical and electrochemical stability in contrast to delaminated 2D V2CTx sheets, which rapidly oxidize in ambient conditions. The electrodes show exceptional high‐rate pseudocapacitive properties in supercapacitors with aqueous electrolytes and can intercalate a variety of cations, delivering capacitances in excess of 1300 F cm−3 and a capacitance retention of ≈77% after one million charge–discharge cycles.