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

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• 作者：Christopher Koenigsmann ; Eli Sutter ; Thomas A. Chiesa ; Radoslav R. Adzic ; Stanislaus S. Wong
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：April 11, 2012
• 年：2012
• 卷：12
• 期：4
• 页码：2013-2020
• 全文大小：641K
• 年卷期：v.12,no.4(April 11, 2012)
• ISSN：1530-6992

文摘

We have employed an ambient, template-based technique that is simple, efficient, and surfactantless to generate a series of bimetallic Pd_1鈥?i>xAu_x and Pd_1鈥?i>xPt_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, Pd₉Au and Pd₄Pt nanowires possess oxygen reduction reaction (ORR) activities of 0.49 and 0.79 mA/cm², respectively, which are larger than the analogous value for commercial Pt nanoparticles (0.21 mA/cm²). In addition, core鈥搒hell PtPd₉Au 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/cm², 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.

Keywords:

Nanowire; bimetallic; palladium, electrocatalysis; platinum monolayer; oxygen reduction reaction