Uniformly dispersing Sb 2 Se 3 nanoparticles in porous carbon as an anode material for enhancing sodium storage capacity.

About 60 nm Sb ₂ Se ₃ nanoparticles are uniformly embedded in a porous carbon substrate to prepare a Sb ₂ Se ₃ /C composite through a combination of pyrolysis reduction and solid-phase selenization. The Sb ₂ Se ₃ /C anode exhibits excellent sodium storage capacity. The initial discharge capacity is up to 420 mA h g ^-1 at 0.1 A g ^-1 , and the specific capacity still remains 339 mA h g ^-1 after 1000 cycles, with a high capacity retention rate of 80%.