Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes
Author(s)Kim, Junhyung; Lee, Seung Woo; Carlton, Christopher; Shao-Horn, Yang
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PtxNi1 - x nanoparticles (Pt:Ni; 1:0, 4:1, 3:1 and 0.7:1) of ~5 nm, were synthesized on carboxylic acid-functionalized multiwall carbon nanotubes (PtxNi1 - x NPs/MWNT). The oxygen reduction reaction (ORR) activity measurements in 0.1 M HClO4 showed an activity order of Pt NPs/MWNTs < Pt4Ni NPs/MWNTs ≈ Pt0.7Ni NPs/MWNTs < Pt3Ni NPs/MWNTs, where Pt3Ni NPs/MWNTs had mass activity 2.5 times higher than a commercial 46 wt % Pt/C catalyst. The enhanced ORR activity of Pt3Ni NPs relative to Pt NPs could be attributed to reduced coverage of oxygenated species on surface Pt sites as evidenced by the positive shift in the onset voltage for OH adsorption.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Electrochemical Energy Laboratory
Electrochemical and Solid-State Letters
Kim, Junhyung, Seung Woo Lee, Christopher Carlton, and Yang Shao-Horn. Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes. Electrochemical and Solid-State Letters 14, no. 10 (2011): B110. © 2011 ECS - The Electrochemical Society.
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