(294a) Ultra-Thin Ptfe-Nanowires As Durable Electrocatalysts for Oxygen Reduction Reaction

Authors: 
Zhang, Z. - Presenter, Michigan Technological University
Li, W. - Presenter, Michigan Technological University
Li, M. - Presenter, Oak Ridge National Laboratory
Wu, Z. - Presenter, Oak Ridge National Laboratory


Abstract:
The sluggish cathode reaction rate and poor catalyst durability are two main
hurdles that hamper the large-scale application of proton exchange membrane
fuel cells (PEMFCs). Recently, we prepared an ultra-thin PtxFey-nanowire
(NW) catalyst with a diameter (2 ? 3 nm) and a large surface area (52 m2/g),
through a solution-phase reduction method. The PtxFey-NW
catalyst demonstrated a higher oxygen reduction reaction (ORR) activity and
better electrochemical durability than conventional Pt/C catalyst in a
three-compartment-cell test. After 1000 cycles of 0 ? 1.3 V (vs. RHE)
accelerated durability test, the relative electrochemical surface area (ECSA)
of Pt2Fe1-NW drops down to 46%, which is two times better
than commercial Pt/C catalyst. In addition, the mass activity at 0.85 V (vs.
RHE) on Pt1Fe1-NW is 39.9 mA/mgPt after
durability test, which is twice that of Pt/C catalyst(18.6 mA/mgPt).

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