Co3O4 nanoparticle modified N, P co-doped carbon paper as sodium carrier to construct stable anodes for Na-metal batteries

N, P co-doped carbon paper modified with Co 3 O 4 nanoparticles has excellent sodiophilicity as anode current collector of Na–CO 2 batteries, which can stably operate for 165 cycles at current densities of 500 mA g −1 with capacity of 500 mA h g −1 .