Atomically dispersed platinum on gold nano-octahedra with high catalytic activity on formic acid oxidation
- Atomically dispersed platinum on gold nano-octahedra with high catalytic activity on formic acid oxidation
- 양성은; 이현주
- Issue Date
- ACS catalysis
- VOL 3, NO 3-443
- Platinum was epitaxially deposited on gold octahedral nanocrystals using an electrochemical method. The coverage of platinum on the gold surface was finely controlled from fully covered multiple overlayers (5 monolayers; denoted as ML) to atomically dispersed submonolayer (0.05 ML). Catalytic activity for formic acid oxidation increased significantly (0.52 A/mg(Pt) for 5 ML to 62.6 A/mg(Pt) for 0.05 ML) with decreasing coverage. This high activity resulted from the control of the reaction pathway toward direct oxidation producing no surface-poisoning species, induced by the absence of platinum ensembles and the bifunctional effect from neighboring Pt-Au sites. The distribution of atomically dispersed platinum was further confirmed by no activity for methanol oxidation, which necessitates platinum ensembles. This result exemplifies that a rational design of the catalyst nanostructure can lead to contrasting activities with the same catalyst, unprecedentedly high activity for formic acid oxidation vs no activity for methanol oxidation.
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