Highly Enhanced Electrocatalytic Oxygen Reduction Performance Observed in Bimetallic Palladium-Based Nanowires Prepared under Ambient, Surfactantless Conditions

作者：Koenigsmann Christopher; Sutter Eli; Chiesa Thomas A; Adzic Radoslav R^*; Wong Stanislaus S

来源：Nano Letters, 2012, 12(4): 2013-2020.

DOI：10.1021/nl300033e

• Nanowire
• bimetallic
• palladium
• electrocatalysis
• platinum monolayer
• oxygen reduction reaction

We have employed an ambient, template-based technique that is simple, efficient, and surfactantless to generate a series of bimetallic Pd1-xAux and Pd1-xPtx 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 ID nanostructures, as a result of their homogeneous alloyed structure. Specifically, Pd9Au and Pd4Pt 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 similar to Pd9Au 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(PV) and 0.16 A/mg(PGM), respectively. The increased activity and catalytic performance is accompanied by improved durability toward ORR.

• 出版日期2012-4