Keywords:b-Ni(OH) 2 nanosheets hybrid supercapacitor multilayer nickel foam A B S T R A C T Ultrafine b-Ni(OH) 2 nanosheets with an average diameter of about 14.5 nm have been fabricated by immersing Na(HCO 3 ) 2 nanoparticles into 6 M KOH solution. The multilayer nickel foam system was introduced to improve the cycling stability of ultrafine b-Ni(OH) 2 nanosheets without using acetylene black. The results demonstrated that the specific discharge capacity of the b-Ni(OH) 2 electrode was up to 524.5C g À1 at 5 A g À1 and retained 83.8% after 1000 cycles, which was better than those of other b-Ni (OH) 2 electrodes obtained using acetylene black as conductors (retained 59.1% after 1000 cycles). Even after 5000 cycles, the specific capacity also maintained 80.8%. In addition, a hybrid supercapacitor was successfully fabricated based on ultrafine b-Ni(OH) 2 nanosheets and active carbon, the corresponding energy density and power density at 0.1 A g À1 were calculated to be 20.45 Wh kg À1 and 75 W kg À1 , respectively. What's more, the hybrid supercapacitor could light up a set of low-voltage light-emitting diodes.

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All-solid-state batteries (ASSBs) are one of the most promising candidates for next-generation energy storage. In particular, ASSBs with sulfide solid-state electrolytes (SEs) offer high conductivity, rivaling those of liquid electrolytes...

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