Catalysis Today
Catalysis Today
5 years ago

Two-Dimensional MXene/A-TiO2 Composite with Unprecedented Catalytic Activation for Sodium Alanate

Two-Dimensional MXene/A-TiO2 Composite with Unprecedented Catalytic Activation for Sodium Alanate
Differing from graphene with a carbon element component, analogous metallic-graphene two-dimensional layered titanium carbide (2D MXene) provides more opportunities to achieve better surface functionalization. Herein, a thin layered 2D MXene/A-TiO2 composite was prepared by chemical exfoliation and hydrothermal decomposition. The 2D MXene/A-TiO2 composite exhibits high catalytic activity in the adsorption and desorption of hydrogen kinetics for NaAlH4. The critical dehydrogenation temperature of NaAlH4 is ∼90°C. The first-stage dehydrogenation (∼3.0wt.%) is accomplished in 50min at 110°C. After the first activated cycle, a constant cycling capacity of 4.7wt.% is remained for a minimum of five cycles tests. It is found that the excellent catalytic activation should be ascribed to the synergistic effect between homogenous distributed Ti-H and TiC, which are originated from MXene/A-TiO2. The results represent a new step forward in the applications of MXene catalytic dehydrogenation and provide new strategies in the quest for new functional MXene derivatives by in-situ modification.

Publisher URL: www.sciencedirect.com/science

DOI: S0920586117307708

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