Few-layer MXene Ti3C2Tx supported Ni@C nanoflakes as a catalyst for hydrogen desorption of MgH2†
Slow hydrogen desorption kinetics and poor cycle durability of MgH2 still remain as challenges for practical applications. In this work, a new approach is proposed to synthesize few-layer MXene Ti3C2Tx supported Ni@C nanoflakes (Ni@C/FL-Ti3C2Tx), which can serve as a highly efficient catalyst for hydrogen desorption of MgH2. After ball milling under a 4 MPa hydrogen atmosphere for 15 hours, the MgH2–10 wt% Ni@C/FL-Ti3C2Tx composite exhibits superior hydrogen desorption kinetics and excellent cycling stability. Further investigation reveals that the enhancement of hydrogen storage properties is attributed to the in situ formed Mg2NiH4 and metallic Ti nanoparticles with a fine size and high dispersity as well as the FL-Ti3C2Tx nanosheets themselves. This work not only reports an effective strategy for improving the hydrogen storage properties of Mg-based materials but provides new insights into the underlying mechanism for optimizing the properties.
- This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers