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Open AccessArticle

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

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Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA
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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
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Authors to whom correspondence should be addressed.
Academic Editor: Minhua Shao
Catalysts 2015, 5(3), 1321-1332; https://doi.org/10.3390/catal5031321
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)
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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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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