High-index facets bounded platinum-based
alloy nanocrystals usually
exhibit enhanced electrocatalytic activity. However, the high surface
energy, thermodynamic instability, and lattice mismatch make it a
significant challenge to synthesize well-defined bimetallic nanocrystals
with high-index facets. Here we developed a one-step wet-chemical
synthesis of uniform PtPb concave nanocubes (CNCs) enclosed by {520}
high-index facets. The as-prepared PtPb CNCs exhibited high synthetic
yield and highly concave structure with an average size of 14 nm.
Moreover, the synergistic effects and exposed {520} facets endowed
the PtPb CNCs with excellent stability and electrocatalytic mass activity
toward the methanol oxidation reaction (MOR), which was 2.16- and
4.62-times higher than PtPb nanocubes (NCs) and commercial Pt/C catalysts,
respectively. This work provides a new way for rational design and
practical application of efficient catalysts.