Highly enhanced electrocatalytic oxygen reduction performance observed in bimetallic palladium-based nanowires prepared under ambient, surfactantless conditions

摘要

We have employed an ambient, template-based technique that is simple, efficient, and surfactantless to generate a series of bimetallic Pd _(1-x)Au _x and Pd _(1-x)Pt _x nanowires with control over composition and size. Our as-prepared nanowires maintain significantly enhanced activity toward oxygen reduction as compared with commercial Pt nanoparticles and other 1D nanostructures, as a result of their homogeneous alloyed structure. Specifically, Pd _9Au and Pd _4Pt nanowires possess oxygen reduction reaction (ORR) activities of 0.49 and 0.79 mA/cm ~2, respectively, which are larger than the analogous value for commercial Pt nanoparticles (0.21 mA/cm ~2). In addition, core-shell Pt～Pd _9Au nanowires have been prepared by electrodepositing a Pt monolayer shell and the corresponding specific, platinum mass, and platinum group metal mass activities were found to be 0.95 mA/cm ~2, 2.08 A/mg _(Pt), and 0.16 A/mg _(PGM), respectively. The increased activity and catalytic performance is accompanied by improved durability toward ORR.