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Highly durable carbon nanotube-supported Pd catalysts covered with silica layers for the oxygen reduction reaction
- Source :
- Journal of Catalysis. 279:381-388
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- 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 HClO4 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 H2O2.
Details
- ISSN :
- 00219517
- Volume :
- 279
- Database :
- OpenAIRE
- Journal :
- Journal of Catalysis
- Accession number :
- edsair.doi...........30ec188d4090c1b8b59460fcace6aa43