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

Abstract 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 ) through 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 Wh 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 pseudocapacitor material for high‐performance capacitive energy storage devices.