Oscillatory dynamics during the methanol electrooxidation reaction on Pt(111)

Silva, Kaline Nascimento da; Sitta, Elton

doi:10.1039/d1cp02490f

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…This phenomenon was particularly obvious in the Pd 3 @Pt 1 /C and Pd 1 @ Pt 1 /C core−shell samples because of their thick Pt layers (Figure S13a). Therefore, the oscillation on the negative-scan currents of the two samples could be attributed to the electrochemical oxidation of the accumulated CO. 53 Figure 4b presents a comparison of the mass activity of the samples at 0.6 V. Pd 50 @Pt 1 /C had the highest mass activity of 2.97 A/mg metal , about 10.7 times that of commercial Pd/C. The FAOR activity of the Pd 50 @Pt 1 /C SAA and some recent representative reports are listed and compared in Table S3, which shows the superior FAOR activity of the Pd@Pt/C SAA catalyst.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Modification of Palladium Nanocrystals with Single Atom Platinum via an Electrochemical Self-Catalysis Strategy for Efficient Formic Acid Electrooxidation

Liang

Cai

et al. 2022

ACS Appl. Mater. Interfaces

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Single atom alloys (SAA) have recently drawn increased attention due to their unique structure, high atomic utilization, and fascinating catalytic performance. However, their controllable synthesis still presents a challenge. This study proposes an electrochemical self-catalysis (ESC) strategy to synthesize Pd@Pt/ C SAA catalysts, that is, depositing Pt atoms on Pd nanocrystals through in situ decomposition of sodium formate. The relationship between composition and structure of Pd@Pt/C is distinguished through a combination of electrochemical analysis, sphere-corrected scanning transmission electron microscopy, and X-ray adsorption spectra. That relationship evolved from SAA to a sea-island structure and even a core−shell structure with composition-controllable atomic ratios, highlighting the great diversity and convenience of this method in nanostructure construction. The Pd@Pt/C SAA catalyst showed excellent catalytic activity to formic acid oxidation with a peak current density of 5.2 A/mg metal , which is about 18.6 times that of the commercial Pd/C. density functional theory calculations revealed that the enhanced activity was due to the "passivation" of Pd sites near the Pt single atoms, which attenuated the adsorption of CO. Based on electrochemical principles, this ESC strategy was also expanded to prepare a series of Pd-based SAA, including Pd−Au, Pd−Ir, and Pd−Bi.

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Section: ■ Results and Discussionmentioning

confidence: 99%