DOE OSTI · 1324166
Two-Dimensional Nb-Based M 4 C 3 Solid Solutions (MXenes)
Abstract
Two new two-dimensional Nb 4 C 3 -based solid solutions (MXenes), (Nb 0.8 ,Ti 0.2 ) 4 C 3 T x and (Nb 0.8 ,Zr 0.2 ) 4 C 3 T x (where T is a surface termination) were synthesizedas confirmed by X-ray diffractionfrom their corresponding MAX phase precursors (Nb 0.8 ,Ti 0.2 ) 4 AlC 3 and (Nb 0.8 ,Zr 0.2 ) 4 AlC 3 . In our report we discuss Zr-containing MXene. We also studied intercalation of Li ions into these two compositions, and Nb 4 C 3 T x in order to determine the potential of those materials for energy storage applications. Lithiation and delithiation peaks at 2.26 and 2.35 V, respectively, appeared in the case of Nb 4 C 3 T x , but were not present in Nb 2 CT x . After 20 cycles at a rate of C/4, the specific capacities of (Nb 0.8 ,Ti 0.2 ) 4 C 3 T x and (Nb 0.8 ,Ti 0.2 ) 4 C 3 T x were 158 and 132 mAh/g, respectively, both slightly lower than the capacity of Nb 4 C 3 T x .
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Yang, Jian, Naguib, Michael, Ghidiu, Michael, Pan, Li-Mei, Gu, Jian, Nanda, Jagjit, Halim, Joseph, Gogotsi, Yury, Barsoum, Michel W., Zhou, Y.. 2015-10-15. Two-Dimensional Nb-Based M 4 C 3 Solid Solutions (MXenes). https://doi.org/10.1111/jace.13922
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