Role of Acid Mixtures Etching on the Surface Chemistry and Sodium Ion Storage in Ti3C2Tx MXene

Two-dimensional transition metal carbides and/or nitrides (MXenes) have shown promise in developing electrochemical storage of metal ions within conductive galleries due to redox reactions with transition metal atoms. Here, effect of surface chemistry on electrochemical storage of sodium ions in MXene interlayer is investigated by etching Ti3AlC2 MAX using different etchants – HF, HF/HCl, and HF/H2SO4.