1 research outputs found
Core Dominated Surface Activity of Core–Shell Nanocatalysts on Methanol Electrooxidation
The activity of core–shell nanoparticles (NCs)
in electrooxidation
of methanol (MOR) was found to be dependent on the crystalline structure
of the core and the lattice strain at the core–shell interface.
Ru-core and Pt-shell NCs delivered 6.1-fold peak MOR current density
at −135 mV than Pt NCs, while the Co-core and Pt-shell NCs
showed a 1.4-fold peak MOR current density at 280 mV. The current
density is improved by the compressive lattice strain of the surface
that is caused by the lattice mismatch between the Pt shell and the
Ru core. For Co-core NCs, the enhancement results from the ligand
effect at surface Pt sites. In addition, the Ru-core NCs maintained
a steady current density of 0.11 mA cm<sup>–2</sup> at 500
mV in a half-cell system for 2 h, which is 100-fold higher than that
of Pt NCs and Co-core NCs. These results provide mechanistic information
for the development of fuel cell catalysts along with reduced Pt utilization
and programmable electrochemical performance