▎ 摘　　要

A new promising metal-free catalyst (N-TCNT@NGS), with a sandwich structure of 1-dimensional nitrogen-doped truncated carbon nanotubes inserted between 2-dimensional nitrogen-doped graphene nanosheets, was synthesized by a facile and green hydrothermal method. Due to the unique structure, multipath charge and mass transport, N-TCNT@NGS exhibits incredible electrocatalytic ability and robust durability for the hydrogen evolution reaction (HER) (Tafel slope: 50 mV dec (1), onset overpotential: -16 mV, operating overpotential at 10 mA cm(-2): -62 mV).