465066 Connected Nanoparticle Catalysts Having a Porous, Hollow Capsule Structure As Carbon-Free Electrocatalysts for Polymer Electrolyte Fuel Cells

Wednesday, November 16, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Takeo Yamaguchi1,2,3, Hidenori Kuroki1,2 and Takanori Tamaki1,2, (1)Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, Yokohama, Japan, (2)Kanagawa Academy of Science and Technology, Yokohama, Japan, (3)CREST, JST, Tokyo, Japan

We developed connected carbon-free platinum-iron (PtFe) nanoparticle catalysts with porous hollow capsule structure (Fig. 1) as oxygen-reduction-reaction (ORR) electrocatalysts for polymer electrolyte fuel cells (PEFCs).[1] This catalysts consist of a beaded network by connected PtFe nanoparticles with a crystallite size of 6~7 nm and a chemically-ordered (face centered tetragonal) superlattice structure. The beaded network is electrically conductive; thus, carbon-supports can be removed from catalyst layers in PEFCs. We have demonstrated that an MEA prepared using a carbon-free cathode of connected PtFe-nanoparticle catalysts was highly durable against start-up/shut-down operations because of the elimination of carbon-corrosion problems. Moreover, an ORR specific activity of a connected PtFe catalyst is about 9 times higher than that of a commercial Pt-nanoparticle catalyst supported on carbon black (Pt/C). Recent results will be explained.

[1] T. Tamaki, H. Kuroki, S. Ogura, T. Fuchigami, Y. Kitamoto, and T. Yamaguchi, Energy Environ. Sci., 8, 3545-3549 (2015)

à–¾: Macintosh HD:Users:Takeo:Desktop:Capsule.pdf

Fig. 1. Schematic illustration and TEM images of a carbon-free connected PtFe-nanoparticle catalyst with porous hollow capsule structure and its ORR activity compared with catalysts on carbon.

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