Controlled synthesis of mono- and bimetallic Pt-based catalysts for electrochemical ethanol oxidation

Facile electrooxidation of ethanol on reduced graphene oxide supported Pt–Pd bimetallic nanocomposite surfaces in acidic media

“…figure 4. The CV scans exhibit typical forward and backward peaks related to the electoroxidation of ethanol and removal of carbonaceous-based intermediates that are not fully oxidized during forward scan, respectively (figures 4(a) and (b))consistent with literature[46]. Compared to the monometallic Pt/rGO and Pt/C (commercial), the Pt-Pd/rGO catalyst exhibit higher onset potential (E onset ) as well as peak current signifying that the bimetallic/rGO configuration owns improved EOR activity.…”

“…It is observed that current retention over the studied time is more on Pt-Pd/ rGO compared to Pt/C and Pt/rGO indicating that the catalyst possesses superior stability towards ethanol electrooxidation. As can be seen from figure 4(d), sudden diminution of current during initial times on all the electrocatalysts is attributed to surface coverage of carbonaceous intermediates (incomplete suppression of the C1 and C2 intermediates adsorbed on the electrocatalyst surface) formed during ethanol oxidation [53]. The simple ethylene glycol chemical reduction utilized for the fabrication of Pt-Pd/rGO electrocatalyst offers more homogeneity and better attachment of nanoparticles to rGO sheet make it suitably stable under the experimental conditions.…”

The Role of a Sn Promoter on an Anodic Pt Electrocatalyst Prepared over H2O2‐Functionalized Carbon Supports for Direct Ethanol Fuel Cell (DEFC) Applications

“…For PtSn/CNT−H 2 O 2 , PtSn/CNT, Pt/CNT−H 2 O 2 , PtSn/VC−H 2 O 2 , PtSn/VC, and Pt/VC−H 2 O 2 , a shoulder and an oxidation peak are observed in the backward scan, suggesting that the oxidation of two dissimilar species occurs in these electrocatalysts along with the ethanol direct oxidation. Nevertheless, these two oxidation peaks could also be related to ethanol oxidation at two different catalytic sites [19] …”

“…Nevertheless, these two oxidation peaks could also be related to ethanol oxidation at two different catalytic sites. [19] The highest current intensities are observed for PtSn catalysts supported on functionalized carbons, suggesting that the surface groups generated during the hydrogen peroxide treatment and the presence of a promoter like Sn can significantly improve the reaction rate. The PtSn/CNTÀ H 2 O 2 catalyst current intensity is the highest of all prepared catalysts (380 mA mg Pt À 1 ), followed by the other bimetallic catalyst supported on functionalized Vulcan carbon (296 mA mg Pt À 1 ).…”

“…Pure Pt catalysts are not efficient for EOR due to the fact that Pt is quickly poisoned by the CO intermediate species. For this reason, the formulation of bi and trimetallic catalysts based on Pt has been extensively studied [9–32] . Selecting Sn as the second metal, PtSn over various carbon nanocomposites has been investigated.…”