Non–noble metal catalysts have recently emerged as promising alternatives to the expensive platinum catalysts for the oxygen reduction reaction (ORR). In this study, a new domain of materials, copper based coordination polymers, has been investigated as promising catalysts for ORR. The study was inspired by copper incorporating biomolecules, which efficiently catalyse the oxygen reduction react...

The application of external electrical field on concrete structures is widely used to protect it from chloride attack or evaluate its resistance penetration in a short period. During these electrochemical processes, the polarization electrodes placed inside and/or outside cannot be ignored. This study proposes numerical model dealing with mass transport and electrode polarizing process under an...

In this paper, preliminary studies of ten different plant extracts as potential corrosion inhibitors carbon steel were examined. For each extract, the concentration range in which it shows anti-corrosion action was first determined, and then most effective determined for extract. The tests performed a brine solution saturated with CO2 at room temperature. aim study to isolate high effectiveness...

Details are outlined of an electrochemical investigation of the oxygen evolution reaction (OER) at passive oxide covered polycrystalline Co electrodes in aqueous alkaline solution. Kinetic studies on electrodes subjected to different pre-treatment routines, yielded different values of the Tafel slope and the reaction order with respect to OH activity. Only one mechanistic pathway could account ...

Julius Tafel (Figure 1) was a Swiss chemist and electrochemist. started his scientific career working on the field of organic chemistry with Hermann Emil Fischer, but soon changed interests to electrochemistry after work Wilhelm Ostwald. Then, Tafel's concentrated compounds relation between rates electrochemical reactions applied overpotentials. name is presently associated many terms: equation...

In present study, the inhibitive impact of Ptychostomum schleicheri extract, a moss species Bryaceae family, on mild steel corrosion in 1 M HCl at ambient temperature was firstly analysed by Tafel extrapolation method, electrochemical impedance spectroscopy (EIS) and linear polarization (LPR) techniques. Electrochemical tests were conducted h immersing steels solutions containing four various c...

In the present study, the corrosion behavior of AISI 347 austenitic stainless steel to ASTM A335 low alloy steel dissimilar joint was investigated. For this purpose, two filler metals, ER309L and ERNiCr-3, were selected to be used during the gas tungsten arc welding process. To investigate the corrosion behavior of the joints after welding, the specimens were tested in 3.5% sodium chloride solu...

in this paper we will prove that if $l$ is a continuous symmetric n-linear form on a hilbert spaceand $widehat{l}$ is the associated continuous n-homogeneous polynomial, then $||l||=||widehat{l}||$.for the proof we are using a classical generalized  inequality due to s. bernstein for entire functions of exponential type. furthermore we study the case that if x is a banach space then we have tha...

The hydrogen evolution reaction (HER) from water through electrocatalysis using highly active noble metal-free catalysts as an alternative to precious Pt-based catalysts holds great promise for clean and renewable energy systems. Here, Mo2C nanosheets well-regulated in N-doped carbon (MCNS/NC)are facilely achieved by in situ confining carburization of a Mo-based inorganic-organic lamellar mesos...