Corrosion inhibition of mild steel in 1 M HCl and 0.5 M H2SO4 by dapsone were studied by polarization resistance, Tafel polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurement. Results obtained revealed that inhibition occurs through adsorption of the drug on metal surface without modifying the mechanism of corrosion process. Potentiodynamic polarization suggested...

Mit dem Digitalen Lagetisch und den Fovea-Tabletts wurde ein Arbeitsplatz geschaffen, welcher es einem Team von Experten ermöglicht, gemeinsam die Sicherheitslage in einer größeren geographischen Region (Szene) zu analysieren und Sicherheitsmaßnahmen zu planen. Dazu bietet der Digitale Lagetisch eine gemeinsame Szenenübersicht und durch den Einsatz der Fovea-Tabletts lagerichtige hochaufgelöste...

In this communication, nickel diselenide (NiSe2) nanoparticles are synthesized by a facile and low-cost hydrothermal method. The synthesis method can be extended to other metal diselenides as well. The electrode made of NiSe2 exhibits superior electrocatalytic activity in the hydrogen evolution reaction (HER). A low Tafel slope of 31.1 mV per decade is achieved for NiSe2, which is comparable to...

On the basis of the thermokinetics of the hydrogen (deuterium) evolution reaction and the thermodynamics of Pd+H(D) system, we analytically and numerically discuss effects of temperature on the loading ratio of hydrogen (deuterium) absorption into electrodes of β-phase PdHx (PdDx) under the galvanostatic charging condition. It is found that the change of the loading ratio with temperature depen...

A comprehensive and general kinetic model is developed for the oxygen reduction reaction in aprotic Li-O2 cells. The model is based on the competitive uptake of lithium superoxide by the surface and solution. A demonstrative kinetic study is provided to demystify the origin of curvature in Tafel plots as well as the current dependency and aberrant diversity of the nature and morphology of disch...

Amorphous molybdenum sulfide (MoSx) is covalently anchored to reduced graphene oxide (r-GO) via a simple one-pot reaction, thereby inducing the reduction of GO and simultaneous doping of heteroatoms on the GO. The oxygen atoms form a bridged between MoSx and GO and play a crucial role in the fine dispersion of the MoSx particles, control of planar MoSx growth, and increase of exposed active sul...

For the first time, the hydrogen evolution reaction (HER) electrocatalytic performances of incompressible γ-Mo0.5W0.5C, prepared by high-pressure, high-temperature (HPHT) synthesis, were investigated in the electrolyte. The polarization curve of the γ-Mo0.5W0.5C cathode exhibits the current density of 50 mA·cm−2 at an overpotential value of 320 mV. The corresponding Tafel slope of the incompres...

This paper applies the notion of relative CR embeddings to study two related questions. First, it answers negatively the question posed by Penrose [8] whether every shear-free null rotating congruence is analytic. Second, it proves that given any shear-free null rotating congruence, there exists a null electromagnetic field which is null with respect to the given congruence, thus disproving a c...