Catalysis of the D-glucose Oxidation Reaction Using Octahedral, Rhombic Dodecahedral, and Cubic Pd@Pt Core-Shell Nanoparticles

[Display omitted] •Syntheses of Pd@PtOct, Pd@PtRD, and Pd@PtNC are successfully demonstrated.•Sequential and transient catalysis of GORs by three Pd@Pt particles are studied.•GORs on the Pd@PtOct and Pd@PtNC proceed via a one-electron pathway.•GOR on Pd@PtRD occurs via a two-electron mechanism.•Pd@P...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-01, Vol.260, p.118140, Article 118140
Main Authors: Wang, Tzu-Pei, Hong, Bang-De, Lin, Yu-Min, Lee, Chien-Liang
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Core-shell particles
Core-shell Pt–Pd particles
Electrical measurement
Electrochemical quartz crystal microbalance
Electrochemistry
Electrons
Epitaxial growth
Gluconolactone
Glucose
Microbalances
Nanoparticles
Oxidation
Palladium
Platinum
Quartz crystal microbalance
Quartz crystals
Reaction mechanisms
Seed-Mediated growth
Silver chloride
X-ray diffraction pattern
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Summary:[Display omitted] •Syntheses of Pd@PtOct, Pd@PtRD, and Pd@PtNC are successfully demonstrated.•Sequential and transient catalysis of GORs by three Pd@Pt particles are studied.•GORs on the Pd@PtOct and Pd@PtNC proceed via a one-electron pathway.•GOR on Pd@PtRD occurs via a two-electron mechanism.•Pd@PtOct and Pd@PtRD had slightly higher activity than Pd@PtNC. Sequential and transient electrocatalysis of d-glucose oxidation reactions (GORs) were studied using core-shell Pd@Pt particles with octahedral (Pd@PtOct, 76.2 nm), rhombic dodecahedral (Pd@PtRD, 79.3 nm), and nanocubic (Pd@PtNC, 62.7 nm) geometries to determine the reaction mechanism. The resulting currents and in situ frequency changes, measured using an electrochemical quartz crystal microbalance, clearly revealed that the molar ratios of electron to d-glucose mass were 1.24 and 1.22 for the sequential catalysis of the glucose oxidation by Pd@PtOct and Pd@PtNC, respectively; however, a higher ratio of 2.22 was observed for Pd@PtRD. The GORs catalyzed by Pd@PtOct and Pd@PtNC occurred via a one-electron pathway to produce gluconate, whereas the GOR catalyzed by Pd@PtRD occurred via a two-electron mechanism to generate δ-gluconolactone. A comparison based on the same electrochemical surface areas suggested that Pd@PtOct and Pd@PtRD have slightly higher activities than that of Pd@PtNC. The amperometric curves of transient catalysis at −0.05 V vs. Ag/AgCl revealed that the oxidative current density of the tested catalysts after 200 s follow the order of Pd@PtOct > Pd@PtNC > Pd@PtRD.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.118140