Interface Engineering in BNNS@Ti3C2 Intercalation Structure for Enhanced Electrocatalytic Hydrogen Evolution
Electrocatalysts with advantages of stability, high efficiency and noble-metal-free feature are in urgent need for water splitting. Herein, based on the interface engineering, a novel BNNS@Ti3C2 intercalation electrocatalyst via controllable synthesis strategy is prepared for the first time. Rich active sites of Ti3C2 are better protected as well as serve as a bridge to connect different layers of BNNS. Furthermore, combining the first-principles calculation, the nature of interface is proved the transformation from semiconducting property to metallicity in the unique intercalation structure. The as-obtained composite possesses the improved conductivity and abundant catalytic active sites, exhibiting a low onset potential of 23 mV and overpotential of 52 mV (vs RHE) at 10 mA·cm-2 with outstanding stability. BNNS@Ti3C2 is used as the electrocatalyst for the first time without noble-metal assistance. This work demonstrates that the layered materials can serve as a promising electrocatalyst by interfacing intercalation structure.