Stimulation of aqueous corrosion by MoS2deposits

Contrasting Oxygen Reduction Reactions on Zero- and One-Dimensional Defects of MoS2 for Versatile Applications

“…A suitable binding of OH with the S atom at the S-edge can make it easy to adsorb and desorb, making the corresponding overpotential reside at the top of the volcano curving, i.e., achieving a preferred catalytic performance. Therefore, the promoted galvanic corrosion of metals after the deposition of MoS 2 particles, as well as their catalytic activity, found in experiment , should originate from the S-edge with a high ORR activity.…”

“…As the mostly used transition-metal dichalcogenide, MoS 2 has wide important applications ranging from nonprecious catalysts − to protective anticorrosion and lubricating coatings. − This is attributed to the various superior physical properties of MoS 2 , e.g., its high stability in various solvents and oxygenated environments, as well as its preferred tolerance to extreme thermal and baric conditions. − In a previous theoretical study, it has been figured out that the pristine MoS 2 surface has a poor ORR catalytic performance due to the weak adsorption of ORR intermediates . This mechanism should more or less contribute to the superior resistance of many MoS 2 -based composite coatings against electrochemical corrosion. ,, However, on the other hand, it is well known that depositing MoS 2 onto metal surfaces will result in effective galvanic cells, and then exacerbate the metal corrosion, , indicating an active ORR therein. Such an active ORR has also been clearly found in a catalysis experiment on MoS 2 nanoparticles (with sizes down to 2 nm) .…”

“…8 This mechanism should more or less contribute to the superior resistance of many MoS 2 -based composite coatings against electrochemical corrosion. 3,11,17 However, on the other hand, it is well known that depositing MoS 2 onto metal surfaces will result in effective galvanic cells, and then exacerbate the metal corrosion, 18,19 indicating an active ORR therein. Such an active ORR has also been clearly found in a catalysis experiment on MoS 2 nanoparticles (with sizes down to 2 nm).…”

A review on tailoring the corrosion and oxidation properties of MoS2-based coatings

“…In 1998, Büttgen et al reported critical observations regarding the damage of the tube reactor (heat exchanger) sheets due to MoS 2 deposits. 96 The damage was observed in the low alloy steel tube sheet in contact with a high alloy steel tube sheet in the presence of water-electrolyte. The corrosion damage was remarkably enhanced due to MoS 2 deposits over the sheets.…”

Lanthanide-doped MoS2 with enhanced oxygen reduction activity and biperiodic chemical trends

“…Pristine MoS 2 has a quite inert basal plane for ORR catalysis, and only small MoS 2 nanoflakes with a considerably increased ratio of active edge sites can exhibit observable ORR activity 16 – 18 . However, MoS 2 edges have low chemical stability and may incur degrading corrosion and oxidization of nanoflakes when exposed to realistic environments 19 , 20 , thus large-scale MoS 2 flakes should still be preferred for long-lasting performance. Due to the significant tuning effect on the electronic structure of MoS 2 , Ln doping may be a promising way to stimulate the ORR activity on its surface for catalysis purposes.…”