In this work, nickel oxide (NiO) films have been prepared by a sparking method on a flexible chromium/gold coated polyethylene terephthalate substrates and investigated for electrochemical energystorage applications. Structural characterizations by scanning/transmission electron microscopies, X-ray 10 diffraction, X-ray photoelectron spectroscopy and UV-vis spectrophotometer reveal that the film comprises polycrstalline NiO nanoparticles with diameters in the range of 3.0-6.0 nm loosely agglomerated into porous foam-like network. The nanoporous sparked NiO films, exhibits remarkable energy-storage behavior with a high average specific charge capacity of 402.75 C g -1 at a discharge current of 1 A g -1 and a good capacity retention of 88% after 1000 cycles at a high discharge current of 40 15 A g -1 . Thus, the sparking method is a promising alternative route for the preparation of high-performance electrochemical energy-storage devices. 65 storage performances are investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) measurements.
Materials and methodsThe schematic illustration of the sparking apparatus for the fabrication of NiO nanoparticles (NiO-NPs) and NiO films is 70
A portable paper-based electrochemical sensor has been developed to determine 5-hydroxymethylfurfural (5-HMF). Screen-printed carbon electrode (SPCE) was facilely fabricated for the first time on a poster paper which showed a...
In this work, a green and simpler method for photometric determination of sulfite based on a flow injection-gas diffusion (FI-GD) system using a natural reagent extracted from roselle (Hibiscus sabdariffa L.) was proposed. Despite the fact that the employed reaction is not selective to sulfite, its sensitivity is high, and the selectivity can be improved by coupling a GD unit to the FI system. The method involves monitoring a decrease in absorbance of the reagent solution that is used as an acceptor solution. When a standard solution or sample solution was injected into an acidic donor stream, the liberated sulfur dioxide diffuses through a gas-permeable membrane of the GD unit into the acceptor solution, causing color fading of the reagent. A linear analytical curve in the range of 5–100 mg L−1 was obtained with a detection limit of 2 mg·L−1. Relative standard deviations of 0.9%, 0.6%, and 0.6% were obtained for the determination of 30, 70, and 100 mg·L−1 SO32- (n = 11). The developed method was applied to wine samples, giving results that agreed with those obtained with the Ripper titrimetric method. The proposed method offers advantages of simplicity, cost-effectiveness, and being environmentally friendly such as reduced chemical consumption and less waste generation.
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