1 research outputs found
Spiny Rhombic Dodecahedral CuPt Nanoframes with Enhanced Catalytic Performance Synthesized from Cu Nanocube Templates
Platinum
was coated on the surfaces of copper nanocubes to form
Cu–CuPt core–alloy–frame nanocrystals with a
rhombic dodecahedral (RD) shape. Co-reduction of Pt<sup>2+</sup> ions
and residual Cu<sup>+</sup> ions in the supernatant of the Cu nanocube
solution followed by the interdiffusion of Cu and Pt atoms over the
core–shell interface allowed their formation. Growth in the
⟨100⟩ directions of the {100}-terminated Cu nanocubes
resulted in the {110}-faceted rhombic dodecahedra. By the introduction
of additional Pt precursor, the {100} vertices of the Cu–CuPt
RD nanocrystals could be selectively extended to form spiny CuPt RD
nanocrystals. After removing the Cu core template, both CuPt alloy
RD and spiny CuPt alloy RD nanoframes (NFs) were obtained with Pt/Cu
ratios of 26/74 and 41/59, respectively. Abundant surface defects
render them highly active catalysts due to the open frame structure
of both sets of NFs. The spiny RD NFs showed superior specific activity
toward the oxygen reduction reaction, 1.3 and 3 times to those of
the RD NFs and the commercial Pt/C catalysts, respectively. In 4-nitrophenol
reduction, both NFs displayed better activity compared to commercial
Pt NPs in the dark. Their activities were improved ∼1.3 times
under irradiation of visible light, attributed to the effect of LSPR
enhancement by the Cu-rich skeleton