“…Nobel metals, such as platinum (Pt), palladium (Pd), gold (Au), have been used in various areas for decades, including fuel cell catalysts, 1, 2 cell imaging, 3, 4 surface-enhanced Raman spectroscopy (SERS), [5][6][7] bio-sensing, 8 and drug delivery. 9,10 Particularly, rational design of noble metal nanostructures with favorable size, shape and composition provides wide opportunities to construct advanced electrocatalysts in fuel cells with high activity and stability.…”