High performance alkaline battery-supercapacitor hybrid device based on diffusion driven double shelled CoSn(OH)6 nanocube@∝-Ni(OH)2 core-shell nanoflower

The design and fabrication of an alkaline battery-supercapacitor hybrid (BSH) device has been proposed here introducing a hierarchically orientated double hydroxide assembly of cobalt tin hydroxide@nickel hydroxide (CoSn(OH)(6)@proportional to-Ni(OH)(2)) as positive (CTH@NH) and nitrogen, sulfur-doped reduced graphene oxide (NSG) as negative electrode. CTH@NH was obtained through few step time-dependant processes. Double shelled CTH nanocube arrays were obtained by excess alkali etching of intermediate nanocubes that are resulted from fast co-precipitation process at earlier stage. Subsequent growth of proportional to-Ni(OH)(2) nanoflake upon double shelled CTH nanocube at high pressure and temperature resulted CTH@NH. Improvised core-shell nanodimensional architecture, reduced particle size, mesoporosity and ample surface charges encourage diffusion mediated charge storage with deep flow facility of electrolyte into inner core of electrode material and thus strengthening charge storage capability and capacity which assured significant specific capacity (C-m) of similar to 1467.24 C g(-1) (specific capacitance (C-s): similar to 2445 F g(-1)) in the hybrid much higher than CTH (C-m similar to 480.96 C g(-1), C-s of similar to 801.7 F g(-1)) at 1 A g(-1). The [CTH@NH//NSG] assembled BSH acquired C-ASC of similar to 151.5 F g(-1) at 1 A g(-1) current density with a long term cycling stability of similar to 95% even after 8000 successive charge-discharge cycles. The concurrent battery performance of CTH@NH along with supercapacitive output of the NSG overcomes the deficiency of specific energy of supercapacitor by providing an excellent specific energy of similar to 53.8 Wh Kg(-1) at a specific power of similar to 800 W Kg(-1) and instigates the high-performance features in the as-fabricated BSH device.

Automated summary

This study proposes a novel alkaline battery-supercapacitor hybrid device with hierarchically oriented double hydroxide assembly and employs nitrogen, sulfur doped reduced graphene oxide as negative electrode. The optimized architecture and fabrication process enhance charge storage capability, achieving a specific capacity of approximately 1467.24 C g(-1) and specific capacitance of approximately 2445 F g(-1).