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

Catalysts

Jue Hu¹  Kurian A. Kuttiyiel¹  Kotaro Sasaki¹  Dong Su¹  Tae-Hyun Yang²  Gu-Gon Park²  Chengxu Zhang³  Guangyu Chen¹  Radoslav R. Adzic¹ 

[1] Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA; E-Mails:;Fuel Cell Research Center, Korea Institute of Energy Research, Daejeon 305-343, Korea; E-Mail:;Hefei Institutes of Physical Science, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, China; E-Mail:

关键词: nickel nitride;    ORR;    electrocatalyst;    core-shell;    stability;    Pt monolayer;   

DOI  :  10.3390/catal5031321

来源: mdpi

【 摘 要 】

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 Pt_MLPdNiN/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 Pt_MLPdNiN/C catalyst is caused by nitrogen doping while reducing the total precious metal loading.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.