Etching high-Fe-content PtPdFe nanoparticles as efficient catalysts towards glycerol electrooxidation
Recently, great effort is being made to improve activity and stability, as well as increase the utilization efficiency of noble metal-based electrocatalyst. Herein, a dealloyed PtPd-based nanoparticle (PtPd-x/C, x = 0, 2, 4, 6, 8, 10), which contains a small amount of Fe inside is obtained by etching a high-Fe-content PtPdFe nanoparticle precursor. It means the final PtPd-x/C having a large amount of PtPd exposed on surface can effectively increase the utilization efficiency of the unit precious-metal to facilitate the glycerol electrooxidation. Attractively, the optimal one of PtPd-6/C not only exhibits higher electrochemical active surface area (113.33 cm2 mg-1 PtPd), oxidation peak current (0.86 A mg-1 PtPd) and stability (0.48 A mg-1 PtPd after 3000s and 5.8% current decreases after 400 cycles), but also shows excellent CO tolerance compared to others. This work demonstrates that the design of multi-component noble metal composite is a feasible way in obtaining some efficient electrocatalysts.