Electrodes from carbon nanotubes/NiO nanocomposites synthesized in modified Watts bath for supercapacitors

Abstract

h i g h l i g h t sNiO with diameter <4 nm was deposited on multiwalled carbon nanotubes. Pseudocapacitance per mass of NiO of the nanocomposite electrode was very high. Modified Watts bath was effective for the size reducing of Ni species. a b s t r a c t A modified Watts bath coupled with pulsed current electroplating is used to uniformly deposit ultrafine nickel oxide particles (diameter < 4 nm) on multiwalled carbon nanotubes. The capacitance of the multiwalled carbon nanotubes/nickel oxide electrodes was as high as 2480 F g À1 (per mass of nickel oxide), which is close to the theoretical capacitance of NiO.

Controlled synthesis of perovskite lanthanum ferrite nanotubes with excellent electrochemical properties

“…where Sc (F g À1 ) is the gravimetric specic capacitance, Dt (s) is the galvanostatic discharge time, DV (V) is the potential window, m (g) is the mass of the active material, and I (A) is the response current. 28,29 . We nd that sample crystallinity increases with increasing calcination temperature for the same calcination time.…”

Liquid phase synthesis of dendritic nickel carbide alloy with high conductivity for advanced energy storage

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Converting Ni-loaded biochars into supercapacitors: Implication on the reuse of exhausted carbonaceous sorbents

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