Multilayered Pt/Ru nanorods with controllable bimetallic sites as methanol oxidation catalysts
- Multilayered Pt/Ru nanorods with controllable bimetallic sites as methanol oxidation catalysts
- 유성종; 전태열; 김경식; 임태훈; 성영은
- DMFC; Pt/Ru nanorods; oblique angle deposition; controllable bimetallic sites
- Issue Date
- Physical chemistry chemical physics : PCCP
- VOL 12, NO 46, 15240-15246
- A physical synthesis of multilayered Pt/Ru nanorods with controllable bimetallic sites as
methanol oxidation catalysts is reported for the first time. The novel nanorods were synthesized
via the oblique angle deposition method, deposited prior to the formation of each individual
noble metal layer, in a sequential fashion. It has been shown that the oblique angle deposition
controls the morphology and electrochemical properties of the resultant nanostructures.
Sequentially the multilayered nanorods comprising Pt and Ru segments exhibited superior
electrocatalytic activity when compared to equivalent monometallic Pt nanorods with respect to
methanol electrooxidation reaction in an acidic medium. Moreover, it has been established that
the electrochemical process takes place at the Pt/Ru nanorods followed the bifunctional
mechanism. The relative rates of reaction, recorded using chronoamperometry, show a linear
relationship between the long-time current density and the number of Pt/Ru interfaces.
Interestingly, the best catalyst for methanol oxidation was found to the surface of bimetallic
Pt/Ru nanorods produced by the heat treatments via the so-called electronic effect. This reflects
the fact that the ensemble effects of combined bifunctional and electronic effects via second
elements could be expected in methanol oxidation reactions. Electrocatalytic activities correlate
well with bimetallic pair sites and electronic properties analyzed by X-ray photoemission
spectroscopy and X-ray absorption near-edge structure.
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