Nickel/Cobalt Molybdate Hollow rods Induced by Structure and Defect Engineering as Exceptional Electrode Materials for Hybrid Supercapacitor.

Oxygen defects and hollow structures positively impact pseudocapacitive properties of diffusion/surface-controlled processes, a component of critical importance when building high-performance supercapacitors. Hence, we fabricated hollow nickel/cobalt molybdate rods with O-defects (D-H-NiMoO 4 @CoMoO 4 ) via a soft-template and partial reduction method, enhancing D-H-NiMoO 4 @CoMoO 4 's electrochemical performance, yielding a specific capacitance of 1329 F g -1 , and demonstrating excellent durability with 95.8% capacity retention after 3000 cycles. D-H-NiMoO 4 @CoMoO 4  was used as the positive electrode to construct an asymmetric supercapacitor, displaying an energy density of up to 34.13 W h kg -1  and demonstrating good predisposition towards practical applications. This work presents an effective approach to fabricate and use hollow nickel/cobalt molybdate rods with O-defects as pseudo-capacitor material for high-performance capacitive energy storage devices.