F-doped NiCo 2 O 4 @CoMoO 4 as an advanced electrode for aqueous Zn-ion batteries.

Heterostructure engineering and element doping is a trustworthy route to attain outstanding aqueous Zn-ion battery electrode materials. Herein, we develop a new type of F-doped NiCo 2 O 4 @CoMoO 4 hierarchical nanostructure with abundant oxygen vacancies for aqueous Zn-ion batteries. The NiCo 2 O 4 @F-CoMoO 4 electrodes exhibit an excellent specific capacity of 402 mA h g -1 at 1 A g -1 . The assembled NiCo 2 O 4 @F-CoMoO 4 //Zn battery has an excellent specific capacity of 328 mA h g -1 at 2 A g -1 , and a high energy density of 544.6 W h kg -1 at a power density of 0.923 kW kg -1 .