Uniformly dispersing Sb₂Se₃ nanoparticles in porous carbon as an anode material for enhancing sodium storage capacity

About 60 nm Sb₂Se₃ nanoparticles are uniformly embedded in a porous carbon substrate to prepare a Sb₂Se₃/C composite through a combination of pyrolysis reduction and solid-phase selenization. The Sb₂Se₃/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%.