Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 6, Pages 7047-7056Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17248
Keywords
PtNi octahedral; graphitized carbon support; oxygen reduction reaction (ORR); membrane electrode assembly (MEA); high potential durability
Funding
- National Natural Science Foundation [21676204]
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In this work, PtNi/GC octahedral nanocrystal catalysts are prepared using graphitized carbon (GC) to solve the problems of cathode catalysts in catalytic performance and proton-exchange membrane fuel cell application. The as-prepared supported catalysts exhibit well-crystallized octahedral morphologies and graphite layer structures with high corrosion resistance. Their mass activities and specific activities are 5 and 7 times higher than those of the commercial Pt/C. The sample with the best performance shows the cell voltage at 1000 mA cm(-2) of 0.672 V and maximum power density of 817.6 mW cm(-2) in the single-cell test, which are increased by 23 mV and 13.2 mW cm(-2) compared to the control. Especially after a high potential test, the above two parameters of this sample are reduced by only 5.6 and 8.4%, which are significantly lower than the attenuation of the control fabricated using Vulcan XC-72 carbon black. The work reveals that the GC-supported PtNi octahedral catalysts can give better consideration to the improvement of electrochemical and single-cell performances.
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