H2O2 Assisted Room Temperature Oxidation of Ti2C MXene for Li-ion Battery Anodes

Bilal Ahmed , Dalaver H. Anjum , Mohamed N. Hedhili , Yury Gogotsi and Husam N. Alshareef ,"H2O2 Assisted Room Temperature Oxidation of Ti2C MXene for Li-ion Battery Anodes"
​Nanoscale, 2016, DOI: 10.1039/C6NR00002A​
Bilal Ahmed, Dalaver H. Anjum, Mohamed N. Hedhili, Yury Gogotsi and Husam N. Alshareef​
H2O2, LIB, Ti2C
Herein we demonstrate that a prominent member of MXene family, Ti2C, undergoes surface oxidation at room temperature when treated with hydrogen peroxide (H2O2). The H2O2 treatment results in opening up of MXene sheets and formation of TiO2 nanocrystals on their surface, which is evidenced by high surface area of H2O2 treated MXene and X–ray diffraction (XRD) analysis. We show that the reaction time and amount of hydrogen peroxide used are the limiting factors, which determine the morphology and composition of the final product. Furthermore, it is shown that the performance of H2O2 treated MXene as anode material in Li ion batteries (LIBs) was significantly improved compared to as-prepared MXenes. For instance, after 50 charge/discharge cycles, specific discharge capacities of 389 mAh/g, 337 mAh/g and 297 mAh/g were obtained for H2O2 treated MXene at current densities of 100 mA/g, 500 mA/g and 1000 mA/g, respectively. In addition, when tested at a very high current density, such as 5000 mA/g, the H2O2 treated MXene showed a specific capacity of 150 mAh/g and excellent rate capability. These results clearly demonstrate that H2O2 treatment of Ti2C MXene improves MXene properties in energy storage application, such as Li ion batteries or capacitors.