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Catalysts 2015, 5(3), 1321-1332; doi:10.3390/catal5031321

Pt Monolayer Shell on Nitrided Alloy Core—A Path to Highly Stable Oxygen Reduction Catalyst

1
Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA
2
Hefei Institutes of Physical Science, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, China
3
Fuel Cell Research Center, Korea Institute of Energy Research, Daejeon 305-343, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Minhua Shao
Received: 15 May 2015 / Revised: 7 July 2015 / Accepted: 13 July 2015 / Published: 22 July 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
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Abstract

The inadequate activity and stability of Pt as a cathode catalyst under the severe operation conditions are the critical problems facing the application of the proton exchange membrane fuel cell (PEMFC). Here we report on a novel route to synthesize highly active and stable oxygen reduction catalysts by depositing Pt monolayer on a nitrided alloy core. The prepared PtMLPdNiN/C catalyst retains 89% of the initial electrochemical surface area after 50,000 cycles between potentials 0.6 and 1.0 V. By correlating electron energy-loss spectroscopy and X-ray absorption spectroscopy analyses with electrochemical measurements, we found that the significant improvement of stability of the PtMLPdNiN/C catalyst is caused by nitrogen doping while reducing the total precious metal loading. View Full-Text
Keywords: nickel nitride; ORR; electrocatalyst; core-shell; stability; Pt monolayer nickel nitride; ORR; electrocatalyst; core-shell; stability; Pt monolayer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hu, J.; Kuttiyiel, K.A.; Sasaki, K.; Su, D.; Yang, T.-H.; Park, G.-G.; Zhang, C.; Chen, G.; Adzic, R.R. Pt Monolayer Shell on Nitrided Alloy Core—A Path to Highly Stable Oxygen Reduction Catalyst. Catalysts 2015, 5, 1321-1332.

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