Uncoupled non-linear equations method for determining kinetic parameters in case of hydrogen evolution reaction following Volmer–Heyrovsky–Tafel mechanism and Volmer–Heyrovsky mechanism

Hydrogen adsorption engineering by intramolecular proton transfer on 2D nanosheets

“…In contrast, f(COOH)-MoS 2 does not show significant changes. Unlike the HER performance of 2H-MoS 2 , which follows the adsorption-dependent Volmer-Tafel mechanism, f(COOH)-MoS 2 is considered to follow the desorption-dependent Volmer-Heyrovsky or Volmer-Tafel-Heyrovsky mechanism, which agrees with the values of the Tafel slope (approximately 56 mV per decade) 32 shown in Fig. 4a Consequently, f(COOH)-MoS 2 and f(OH)-MoS 2 show high wettability with water, which is beneficial for the HER reaction.…”

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

“…We notice that the corrosion current density is lower in the presence of Q-CH 3 NHyQ to 10 -3 M and becomes only 19.50 µA cm -2 , this result means that the inhibitor Q-CH 3 NHyQ is more effective than Q-HNHyQ, on the other hand, the addition of the tested organic products Q-CH 3 NHyQ and Q-HNHyQ did not significantly affect the value of cathodic Tafel slope (β c ). This result indicates that the proton reduction mechanism (the slowest step) is not affected by the addition of these organic compounds [39], so the mechanism of inhibition involves a simple reaction that blocks the active sites without modifying the corrosion mechanism [40]. The decrease in the anodic and cathodic Tafel slopes indicates that inhibitors are going to retard the anodic dissolution and hydrogen evolution reactions i.e.…”

Coconut coir dust extract: a novel eco-friendly corrosion inhibitor for Al in HCl solutions

“…A recombination step (Tafel reaction) For hydrogen evolution reaction, the cathodic reaction may have three different steps: First, water molecule or hydronium ion is discharged on electrode surface to produce hydrogen atom in acidic solution and an adsorbed hydrogen atom, MH ads , is generated (Volmer reaction). Second, one electron is transferred to a hydronium ion and the hydrogen evolution reaction occurs on metal surface (Heyrowsky reaction) or a pure chemical reaction takes place subsequently (Tafel reaction) (52). In spite of the three states for the formulation of the mechanism, no one of the three reactions formulated occurs as a single step but combines with another; i.e.…”