Pd-Ag alloy hollow nanostructures with interatomic charge polarization for enhanced electrocatalytic formic acid oxidation
palladium, silver, electrocatalysis, formic acid oxidation, hollow nanostructures
Formic acid oxidation is an important electrocatalytic reaction in protonexchangemembrane (PEM) fuel cells, in which both active sites and speciesadsorption/activation play key roles. In this study, we have developed hollowPd-Ag alloy nanostructures with high active surface areas for application toelectrocatalytic formic acid oxidation. When a certain amount of Ag is incorporatedinto a Pd lattice, which is already a highly active material for formic acidoxidation, the electrocatalytic activity can be significantly boosted. As indicatedby theoretical simulations, coupling between Pd and Ag induces polarizationcharges on Pd catalytic sites, which can enhance the adsorption of HCOO*species. As a result, the designed electrocatalysts can achieve reduced Pd usageand enhanced catalytic properties at the same time. This study represents anapproach that simultaneously fabricates hollow structures to increase the numberof active sites and utilizes interatomic interactions to tune species adsorption/activation towards improved electrocatalytic performance.
Tsinghua University Press
Dong Liu,Maolin Xie,Chengming Wang,Lingwen Liao,Lu Qiu,Jun Ma,Hao Huang,Ran Long,Jun Jiang,Yujie Xiong, Pd-Ag alloy hollow nanostructures with interatomic charge polarization for enhanced electrocatalytic formic acid oxidation. NanoRes.2016, 9(6): 1590–1599