Two-dimensional vanadium carbide (V2CTx) MXene as supercapacitor electrode in seawater electrolyte

In this study, two-dimensional V2CTx MXene has been prepared by selectively etching Al layers from V2AlC MAX phase by NaF+HCl etching at 90 °C for 72 h and its performance as supercapacitor (SC) electrode were tested using simulating seawater as electrolyte. V2CTx MXene-based electrodes shows a good capacitance of 181.1 F/g, which is in accordance with the volumetric specific capacitance of 317.8 F/cm3, and with 89.1% capacitance retention even after 5000 cycle. Compared with other MXenes, V2CTx have better electrochemical performance as SC electrode. This work provides an innovative strategy to apply V2CTx MXene as SC electrode in safety and effective seawater electrolyte.Graphical abstractIn this work, highly pure V2CTx MXene was synthesized by NaF+HCl etching. The electrode based on the V2CTx MXene for supercapacitors in seawater electrolyte exhibited better performance than other MXenes. It had remarkable volumetric specific capacitances of 317.8 F/cm3 at 0.2 A/g, and a good cycling stability, i.e., 89.1% capacitance retention after 5000 cycles.
Source: Chinese Chemical Letters - Category: Chemistry Source Type: research