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- W2011083092 abstract "Carbon nanotube (CNT)-supported Pd metal catalysts covered with silica layers show improved durability for oxygen reduction in polymer-electrolyte fuel cells. ► Coverage of carbon nanotube-supported Pd metal with silica layers (SiO 2 /Pd/CNT). ► SiO 2 /Pd/CNT for oxygen reduction in fuel cells. ► Coverage of Pd/CNT with silica prevents deactivation of Pd under cathode conditions. ► Coverage of Pd/CNT with silica inhibits the formation of H 2 O 2 from O 2 . ► Silica-coating method is effective for development of non-Pt catalysts for PEFC. Pd metal supported on carbon nanotubes (Pd/CNT) for use as a cathode catalyst in polymer electrolyte fuel cells was covered with silica layers a few nanometers thick to improve the durability of the catalyst under severe cathode conditions. The silica-coated Pd/CNT cathode catalyst showed similar activity for the oxygen reduction to Pd/CNT despite coverage of the Pd metal with a silica insulator. In addition, the silica-coated Pd/CNT was highly durable during potential cycling between 0.05 and 1.20 V ( vs . reversible hydrogen electrode) in aqueous HClO 4 while Pd/CNT suffered serious deactivation under the same conditions. The silica layers in the silica-coated Pd/CNT prevent the diffusion of dissolved Pd species from the Pd metal out of the layers. Therefore, silica-coated Pd/CNT was highly durable under the cathode conditions. Furthermore, coverage of Pd/CNT with silica layers inhibited the two-electron reduction of oxygen to H 2 O 2 ." @default.
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- W2011083092 date "2011-04-01" @default.
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- W2011083092 title "Highly durable carbon nanotube-supported Pd catalysts covered with silica layers for the oxygen reduction reaction" @default.
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- W2011083092 doi "https://doi.org/10.1016/j.jcat.2011.02.008" @default.
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