Ultrathin AgPt Alloy Nanorods as Low-cost Oxygen Reduction Reaction Electrocatalysts in Proton Exchange Membrane Fuel Cells
The excellent catalytic activities and stabilities of one-dimensional (1D) AgPt alloy nanostructure have been well reported toward oxygen reduction reaction (ORR). However, their real application in proton exchange membrane fuel cells (PEMFCs) is still highly challenging due to the large difficulties with their preparation and fabrication into practical electrodes. By a facile self-growth assisted reduction method, ultrathin single-crystal AgPt alloy nanorods (NRs) with a diameter of 3-4 nm are uniformly grown on carbon support through a finely controlled ion reduction process tuning the nucleation and growth of Pt and Ag. Enhanced power performance is successfully demonstrated in single-cell test. With 50 at% Ag, the AgPt NR/C electrode shows 1.16-fold power density and 1.22-fold mass activity over the Pt NR/C electrode, and 1.14 and 1.51-fold to the commercial Pt/C electrode, respectively. Comparable durability is also established in fuel cells by using the accelerated degradation test despite Ag is included.