Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719405 | International Journal of Hydrogen Energy | 2014 | 8 Pages |
Abstract
Cu@Pt-Ru core-shell supported electrocatalysts have been synthesized by a two-step process via a galvanic displacement reaction. XRD diffraction and EDX analysis, and cyclic voltammetry measurements revealed the presence of nanoparticles composed by a Cu-rich Pt-Cu core surrounded by a Pt-rich Pt-Ru shell. Cyclic voltammetry and chronoamperometric measurements showed that as-synthesized core-shell materials exhibit superior catalytic activity towards methanol and ethanol electro-oxidation compared to a commercial Pt-Ru/C catalyst with higher Pt loading. This behavior can be associated with the lattice mismatch between the Pt-rich shell and the Cu rich core, which in turn produces lattice-strain, surface ligand effects and a large amount of surface defect sites. In addition, the core-shell electrodes displayed a better catalytic activity and lower onset potentials for ethanol oxidation than for methanol oxidation.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Juan Manuel Sieben, Vanina Comignani, Andrea E. Alvarez, Marta M.E. Duarte,