Abstract
Ultrathin Pd nanosheets (NSs) have great advantages in catalysis due to their large specific surface area and high percentage of under-coordinated atoms. However, the electrochemical performance still can be improved via composition-controllable growth of their solid solution. Herein, seeded alloying strategy was proposed to synthesize Pd-Cu solid solution from Pd NSs and Pd-Cu nanostructures with tunable molar ratios obtained by changing the amount of Cu precursor. As compared to the pristine Pd NSs, the Pd-Cu solid solution shows significantly enhanced methanol oxidation reaction (MOR) performance over those of Pd NSs and homemade Pd/C as the incorporation of Cu weakens the adsorption of CO intermediate on Pd in the MOR process. The choice of template is pivotal to the growth, as a shape-dependent behavior could be identified in the alloying of Cu with Pd nanosheets enclosed by {111} and {100} facets, Pd nanocubes enclosed by {100} facet, and Pd nano-tetrahedrons enclosed by {111} facet. The Pd-Cu solid solution with tunable composition can only be obtained from Pd NSs and the shape-dependent alloying process is mainly determined by the diffusion barrier and the minimum diffusion depth of the different facets. [Figure not available: see fulltext.].
Original language | English |
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Pages (from-to) | 9116-9124 |
Number of pages | 9 |
Journal | Nano Research |
Volume | 16 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2023 |
Externally published | Yes |
Keywords
- Pd-Cu alloy nanosheets
- methanol oxidation reaction
- optimized electronic structure
- tunable composition
- weakened CO-adsorption
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- General Materials Science
- Condensed Matter Physics
- Electrical and Electronic Engineering