期刊论文详细信息
JOURNAL OF POWER SOURCES 卷:324
Load cycle durability of a graphitized carbon black-supported platinum catalyst in polymer electrolyte fuel cell cathodes
Article
Takei, Chikara1  Kakinuma, Katsuyoshi2  Kawashima, Kazuhito1  Tashiro, Keisuke1  Watanabe, Masahiro2  Uchida, Makoto2 
[1] Mitsubishi Motors Corp, Adv Powertrain Dev, 1 Nakashinkiri,Hashime Cho, Okazaki, Aichi 4448501, Japan
[2] Univ Yamanashi, Fuel Cell Nanomat Ctr, 6-43 Miyamae, Kofu, Yamanashi 4000021, Japan
关键词: Polymer electrolyte fuel cells;    Load cycle;    Graphitized carbon black-supported platinum catalyst;    OCV/load holding time;    Pt dissolution;    Pt particle growth;   
DOI  :  10.1016/j.jpowsour.2016.05.117
来源: Elsevier
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【 摘 要 】

We focus on Pt degradation occurring during fuel cell vehicle (FCV) combined drive cycles involving load and open circuit voltage (OCV) just after startup and during idling. Load cycle durability is evaluated as a function of OCV/load holding time, load rate and relative humidity (RH) with a graphitized carbon black supported platinum catalyst (Pt/GCB) in the cathode. The degradation of Pt/GCB is suppressed for shorter OCV holding times, lower load rates and lower RH. Scanning ion microscopy (SIM) images of membrane cross-sections indicate that the amount of Pt deposited in the membrane decreases during drive cycles involving load with short OCV holding times. Investigations of the Pt distribution in the cathode catalyst layer (CL) by using scanning TEM-EDX show that the dissolution of Pt is suppressed on the membrane side in the CL. The Pt dissolution is accelerated by the high Pt oxidation due to the long OCV holding time. A load cycle with both long OCV holding time and low load inhibits the Pt2+ migration into the membrane but accelerates the Pt particle growth due to electrochemical Ostwald ripening; meanwhile, a load cycle with long OCV holding time at lower RH prevents both the Pt dissolution and particle growth. (C) 2016 The Authors. Published by Elsevier B.V.

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