Ni-Co-Y2O3 composite coating was prepared by electrodeposition from an electroplating bath containing a suspension of Y2O3. The morphology and microstructure in view of their possible application as electrocatalytic materials for the hydrogen evolution reaction were characterized by SEM and XRD, respectively. The electrocatalytic efficiency was evaluated on the basis of steady-state polarization, Tafel curves and electrochemical impedance spectroscopy measurements carried out in 0.50 M Na2SO4 + 0.10 M H2SO4 solution. It was found that hydrogen evolution reaction proceeded better in the presence of Y2O3. The hydrogen evolution potential of Ni-Co-Y2O3 composite electrode moved positively about 100 mV at 13 mA cm-2 compared with that of Ni-Co alloy electrode.
The interaction of methyl caffeate with herring sperm DNA was investigated by cyclic voltammetry, differential pulse voltammetry and ultraviolet absorption spectrometry. Methyl caffeate had a well-defined electrochemical signal in 0.50 M acetate buffer (pH 4.6) involving two electrons and two protons. The binding of methyl caffeate to herring sperm DNA resulted in a series of changes in the electrochemical behavior, giving a considerable decrease in the peak currents and a negative shifts in the peak potential of methyl caffeate, suggesting the interaction of methyl caffeate and herring sperm DNA by an electrostatic mode. Furthermore, the data from the electrochemical investigation showed that a non-electroactive supramolecular compound was formed between methyl caffeate and herring sperm DNA. The conclusion was reinforced by ultraviolet absorption spectrometry.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.