Size-Selective Kinetics of Nanostructured Pt/GC Model Electrocatalysts for CO Stripping

Abstract

We studied using dynamic Monte Carlo (DMC) models the size-selective kinetic characteristics of CO monolayer oxidation (CO stripping) on multiscale nanostructured Pt/GC model electrodes comprising nanodisks with diameters of 120 nm and nanoparticles with diameters of 6 nm. We used the DMC models to simulate preadsorbed CO (CO ad ) oxidation peaks and voltammetry responses for the two types of nanostructures and compared them to experiments. Our DMC simulations showed that the different CO stripping voltammetry peaks for the nanodisks and the nanoparticles observed in experiments result from different surface motilities of the CO ad molecules on the catalyst surfaces and from different initial CO ad configurations.

Electrochemical CO stripping on nanosized Pt surfaces in acid media: A review on the issue of peak multiplicity

“…[50]. Regarding the correlation between CO surface diffusion and the appearance of multiple peaks in CO stripping, a recent theoretical study was done by Zhang et al [54] by means of Dynamic Monte Carlo (DMC) simulations and using the data obtained by Behm's group already discussed in Section 3 and shown in Fig. 7.…”

Engineering Pt Nanoparticles onto Resin‐Derived Iron and Nitrogen Co‐Doped Porous Carbon Nanostructure Boosts Oxygen Reduction Catalysis

“…This result was attributed to the change of the adsorption energy of intermediate species caused by the interaction between Pt NPs and support resulting in more easily desorption for CO. [42] In addition, the double CO stripping peak of PtÀ Fe/NC catalyst originates from Pt nanoparticles, platinum oxide, and iron oxide, which is consistent with the results of XPS. [43] As shown in Table S2, the electrochemical surface area (ECSA) of the PtÀ Fe/ NC and commercial Pt/C catalysts were 43.15 m 2 /g and 69.12 m 2 /g which calculated by the e peak area of CO stripping and the loading of Pt on the electrode.…”

Stress induced to shrink ZIF-8 derived hollow Fe-NC supports synergizes with Pt nanoparticles to promote oxygen reduction electrocatalysis

“…metal state and oxidation state) of the metals in the catalyst. 39,44,45 Furthermore, the electrochemically active surface area of the Pt@Fe-NC catalyst was calculated to be 77.79 m 2 g À1 (Table S1 †) using the CO stripping peak area and loading of Pt, which is higher than that of commercial Pt/C (69.12 m 2 g À1 ), indicating that the Pt@Fe-NC sample can be expected to have high ORR activity.…”