Adsorbed Carbon Monoxide-Enabled Self-Terminated Au-Grafting on Pt 6 Nanoclusters for Enhanced Methanol Electrooxidation

The study presents the first example of an adsorbed carbon monoxide (CO) enabled self-terminated Au-grafting on triphenylphosphine (PPh ) stabilized Pt nanoclusters (NCs) (Pt (PPh ) Cl NCs or Pt NCs). Adsorbed PPh ligands weaken the Pt-CO bond enabling the self-terminated Au-grafting on Pt NCs. The...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-11, Vol.20 (44), p.e2401998
Main Authors: Mymoona, Paloli, Shibu, Edakkattuparambil Sidharth, Jeyabharathi, Chinnaiah
Format: Article
Language:English
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Summary:The study presents the first example of an adsorbed carbon monoxide (CO) enabled self-terminated Au-grafting on triphenylphosphine (PPh ) stabilized Pt nanoclusters (NCs) (Pt (PPh ) Cl NCs or Pt NCs). Adsorbed PPh ligands weaken the Pt-CO bond enabling the self-terminated Au-grafting on Pt NCs. The Au-grafted Pt NCs exhibit enhanced methanol electrooxidation (MOR) in acidic solutions. The surface is composed of a PtAu ensemble exhibiting enhanced MOR and CO tolerance due to the synergistic interaction of Pt with Au and PPh . The hydrogen underpotential deposition (H-UPD) signal from a CO-covered surface reveals the existence of free-Pt sites on the PtAu ensemble causing higher MOR reactivity. The Au and PPh ensure electrocatalytic activity of the NCs, depriving of them at anodic potentials results in "a death-valley" trend.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202401998