Exploring comwposite nanomaterials with novel and stable nanostructures is of great importance for high performance supercapacitors (SCs). Herein, the nanosheet-like XMoO_4 (X=Ni, Co) were uniformly grown on the carbon submicrofibers (CMFs) by a facile hydrothermal route. The NiMoO_4 @CMFs exhibits higher specific capacitance of 1485.53 F g~(-1) and better cycling stability with 87.6% retention after 3000 cycles at 1 A g~(-1) than that of CoMoO_4 @CMFs (1407.1 F g~(-1) 80.6% retention after 3000 cycles at 1 A g~(-1)). To further improve the electrochemical performance of NiMoO_4 @CMFs, the hollow porous carbon submicrofibers (HPCMFs) were designed and used as a substrate for NiMoO_4. Benefiting from the hollow porous structure, the HPCMFs can provide large specific surface area for electrolyte permeating and supply more ion channels in the charge-discharge process. Therefore, the NiMoO_4 HPCMFs exhibits a high specific capacitance of 1600.0 F g~(-1) at 1 A g~(-1) and good cycling stability of 90.7% retention after 3000 cycles. The all-solid stated symmetric supercapacitors (ASSCs) were directly assembled by using NiMoO_4 @HPCMFs as electrode without any additives, which shows good flexibility and a high energy density of 55.33 Wh kg~(-1) at a power density of 999.89 W kg~(-1). Moreover, five series ASSCs can light 'DHU' logo, indicating potential application prospect in wearable electronics.
NSTL
Elsevier
