Three-dimensional hollow nitrogen-doped carbon shells enclosed monodisperse CoP nanoparticles for long cycle-life sodium storage

Transition metal phosphides are emerging as promising anode materials of sodium ion batteries (SIBs) due to their high performance in terms capacity and operational stability. Highly isolated CoP nanoparticles encapsulated 3D hollow nitrogen-doped carbon networks (CoP/HNC composite) designed via polymerization poly-dopamine (PDA) on ZIF-67 the subsequent in-situ phosphorization. Ultrafine (10 ± 2 nm) decorated polyhedral shells a porous architecture. Benefiting from unique construction, CoP/HNC electrode delivers reversible long cycle-life 223 mA h g−1 for storage at 500 after 700 cycles. DFT simulations indicate that Na atoms strongly bound surfaces, significantly concentrate near beneficial ions this composite material. These results suggest can be material SIBs. Besides, strategy could applied fabricate other electrochemical devices.