Morphology engineering of novel MnMoO4@NiMoO4 core–shell nanostructure as an electrode material for asymmetric supercapacitor device

Abstract

The pursuit of innovative and adaptable electrode materials with exceptional electrochemical performance is crucial for the improvement of sophisticated energy storage devices. Herein, we report a novel design of unique manganese molybdate@nickel molybdate (MnMoO4@NiMoO4) nanorods-on-nanosheets core–shell structures grown on nickel foam as a binder-free electrode using a two-step solvothermal approach for asymmetric supercapacitor. Initially, the samples were scrutinized by spectroscopic (XRD and XPS) and microscopic (FE-SEM, HR-TEM) analysis. The distinct core–shell design offers an efficient mesoporous network, ion diffusion channels a rapid electron transfer pathway, and accommodates more active sites for MnMoO4 and NiMoO4. The optimized MNM-160 presents a superior specific capacitance (Cs) of 1160.52 F/g at 0.5 A/g with an outstanding lifespan in a three-electrode cell. The assembled asymmetric supercapacitors (ASC) device exhibits an understanding of energy density (29.27 Wh kg−1) and power density (961.26 W kg−1). In addition, notable cycling stability with ∼89.85 % retaining over 10,000 charge/discharge cycles in ASCs. Finally, the practical ability is verified by three serial-connected ASC devices to drive the light-emitting diodes (LEDs). Hence, the present study clearly illustrates the efficient electrochemical performance, it can be considered a favorable material for future energy storage devices.