Improvement of platinum adhesion to carbon surfaces using PVD coatings

Pt/Ru/C nanocomposites for methanol electrooxidation: how Ru nanocrystals’ surface structure affects catalytic performance of deposited Pt particles

“…The adhesion between Pt and graphite-type carbon black is much smaller than that between Pt and metal. 39 Similarly, Pt particles cannot be deposited firmly on the side surface of Ru CCs due to the atomic arrangement mismatch at their interface. Therefore, Pt particles are likely to aggregate or fall off carbon black or the side surface of Ru CCs during the voltage scan.…”

Shape‐directed platinum nanoparticle synthesis: nanoscale design of novel catalysts

“…The shapes of the nanoparticles can be controlled during the synthesis process to produce materials exhibiting different physical and chemical properties. Common synthetic methods include chemical vapor deposition, aerosol‐assisted deposition, electrochemical reduction, electron‐beam‐induced reduction, flame synthesis, galvanic displacement and incipient wetness methods in which platinum is deposited and reduced directly onto a support. The incipient wetness procedure utilizes metal salt solutions that are adsorbed onto the surface of supports then thermally reduced.…”

“…The control of shape and size during platinum nanoparticle synthesis is an essential part of designing and studying catalyst materials with improved activity and selectivity. Recent studies which characterized catalysts' shapes and exposed surfaces indicate that surface structures can be altered to tune catalytic properties . It was also shown that high index facets on a catalyst surface may exhibit higher activities than lower index facets for certain reactions due to the decreased coordination of step edges and defects, but these sites can also be detrimental to other reactions .…”

Analysis of Ti–6Al–4V adhesion to AISI 52100 steel and TiN during unlubricated sliding contact

“…The initial stage of sliding shown in the coefficient of friction (COF) vs. sliding distance plots (Fig. 2) corresponds to the formation of adhesive junctions between Ti-6Al-4V and steel and TiN coatings during which frictional force gradually increases to a peak value corresponding to the "threshold force" where the junctions break and COF declines [18] and the friction force between Ti-6Al-4V and the counterface surfaces can be attributed to adhesion and plowing force and related to the strength of junctions between Ti-6Al-4V and the counterface surfaces [19][20][21]. For steel a threshold friction force of 1.05 N was reached after a sliding distance of 2.0 mm, however, for TiN coating the threshold force reached the value of 1.20 N after distances of 0.7 mm (Fig.…”