Abstract
Exploiting high-performance and efficient electrode materials is important for stimulating the energy density of hybrid supercapacitors. However, it is a big challenge to fabricate a well-ordered amorphous/crystalline hetero-phase with hydroxides/oxides for high energy storage. Herein, the fabrication of hetero-phase arrangement with amorphous nickel-manganese hydroxide (NiMn) nanosheets (NSs) as a shell and crystalline nickel-molybdenum hydrate oxide (NiMo) nanorods (NRs) as a core (i.e., NiMo NRs@NiMn NSs architecture) is reported. With the advantages of the NSs wrapped NRs, tri-metallic composite electrode demonstrates superior areal capacity and excellent cycling retention. Moreover, the NiMo NRs@NiMn NSs are prepared at various reaction temperatures (i.e., 140, 160, and 180 °C) to study the influence on the morphology and electrochemical performance. The synergistic behavior of the core–shell design (prepared at 160 °C) demonstrates a maximum areal capacity of 979.2 μAh/cm2 at 5 mA/cm2 which is higher than the other electrodes as well as good cycling stability (10,000 cycles). Additionally, a pouch-like hybrid cell (PHC) assembled with NiMo NRs@NiMn NSs-160 and activated carbon electrodes exhibits a maximum areal capacity of 500.60 µAh/cm2 (at 5 mA/cm2) with excellent energy and power densities of 392.9 μWh/cm2 and 4828.3 μW/cm2, respectively. Especially, the PHC reveals a long-life stability with 99.1 % retention after 10,000 cycles. The practicability of PHC is demonstrated by operating various portable electronic devices.
Published Version
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