Preparation, characterization and degradation mechanisms of PtCu alloy nanoparticles for automotive fuel cells

Star-like PtCu nanoparticles supported on graphene with superior activity for methanol electro-oxidation

“…For stars-like PtCu nanoparticles, compared to the pure Pt, the hydrogen underpotential deposition region shows a nearly featureless bump, the similar voltammetric result is also observed on PtCu alloy particles by others [38]. Strasser and co-workers report that surface Cu atoms of irregular shape PtCu alloy particles can be electrochemically dissolved (voltammetric dealloying) and the obtained particles are very active for oxygen reduction reaction [39,40]. In contrast, within the potential window used in this work no apparent Cu dissolution current is observed on the stars-like PtCu nanoparticles, this may be ascribed to there are tiny Cu in the stars-like PtCu alloy nanoparticles.…”

Pt-Based Core–Shell Catalyst Architectures for Oxygen Fuel Cell Electrodes

“…28,39,59,80,101,107,120,142,[155][156] Moreover, the fuel cell performance strongly depends on the chosen operating conditions such as potential regimes, upper turning potentials and scan rates. For instance, nanoparticles strongly suffer from the frequently startand-stop driving of PEMFC vehicles due to the strong metal dissolution and carbon corrosion combined with a strong particle detachment under highly anodic potentials (up to 1.5 V/RHE).…”

Electrochemical Test Procedures for Accelerated Evaluation of Fuel Cell Cathode Catalyst Degradation

“…The data suggest that the hold time at high or low potential plays no significant role for the degradation process. Moreover, the main degradation mechanisms commonly held responsible for ECSA losses, Pt dissolution and Pt agglomeration [18][19][20][21][22], were quantified for the tests where the hold times were varied to 1/1, 2/2, 3/3, 4/4 s. Figure 3 shows the contribution of platinum mass loss quantified by ICP-MS and the change in dispersion determined by TEM analysis over the ECSA loss.…”