Seed-Mediated Synthesis of Core/Shell FePtM/FePt (M = Pd, Au) Nanowires and Their Electrocatalysis for Oxygen Reduction Reaction

被引：263
作者：
Guo, Shaojun [1 ]
Zhang, Sen [1 ]
Su, Dong [2 ]
Sun, Shouheng [1 ]
机构：
[1] Brown Univ, Dept Chem, Providence, RI 02912 USA
[2] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 37期
关键词：
METAL-FREE ELECTROCATALYSTS; FORMIC-ACID OXIDATION; FUEL-CELLS; FEPT NANOPARTICLES; CATALYSTS; GRAPHENE; NANOCRYSTALS; NANOTUBES; NANOCUBES; METHANOL;
D O I：
10.1021/ja406091p
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report a new seed-mediated growth of FePt over 2.5 nm wide FePtM (M = Pd, Au) nanowires (NWs) into core/shell FePtM/FePt NWs with controlled FePt shell thickness from 0.3 to 1.3 nm. These FePtM/FePt NWs show shell thickness and core composition-dependent electrocatalytic activity for oxygen reduction reaction (ORR) in 0.1 M HClO4. These core/shell FePtM/FePt NWs are generally more active and durable than the corresponding alloy NWs. Among FePtM/FePt NWs, FePt NWs, FePtPd NWs, and commercial Pt studied, the FePtPd/FePt NWs (0.8 nm shell) show the specific activity of 3.47 mA.cm(-2) and the mass activity of 1.68 A/mg Pt at 0.5 V (vs. Ag/AgCl), superior to all other NWs (less than 1.59 mA/cm(2) and 0.82 A/mg Pt for FePtAu/FePt and FePt) as well as the commercial Pt (0.24 mA/cm(2) and 0.141 A/mg Pt). The FePtM/FePt (0.8 nm shell) NWs are also stable in the ORR condition and show no activity decrease after 5000 potential sweeps between 0.4 and 0.8 V (vs Ag/AgCl). They are the most efficient nanocatalyst ever reported for ORR.
引用
收藏
页码：13879 / 13884
页数：6
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