In:
ECS Transactions, The Electrochemical Society, Vol. 33, No. 1 ( 2010-10-01), p. 143-152
Abstract:
Nanostructured thin film catalysts (NSTF) with widely varying compositions of PtxMyNz (M, N = Ni, Co, Zr, Hf, Fe, Mn) have been evaluated for 0 〈 x,y,z 〈 1. The catalysts' activity for oxygen reduction (ORR) was measured in 50 cm2 fuel cell membrane electrode assemblies. PtxNiy was found to be unique in showing an extraordinarily sharp peak in ORR activity as a function of the as-made composition around x=3, y=7. This composition gave a corresponding fcc lattice parameter of 3.71 Angstroms and a grain size of 7.5 nm. Both surface area and specific activity increases contribute to the increased mass activity. The ORR mass activity of the Pt3Ni7 is 60% higher than for the NSTF standard Pt68Co29Mn3 alloy.
Type of Medium:
Online Resource
ISSN:
1938-5862
,
1938-6737
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2010
