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submitted on 31.10.2017 and posted on 01.11.2017by Tetsuya Kimata, Kenta Kakitani, Shunya Yamamoto, Iwao Shimoyama, Daiju Matsumura, Akihiro Iwase, Wei Mao, Tomohiro Kobayashi, Tetsuya Yamaki, Takayuki Terai
High activity is one of the primary requirements for the
catalysts in proton exchange membrane fuel
cell applications. Platinum (Pt) is the best-known catalyst especially
for oxygen reduction at the cathode; however, further activity improvements are
still required. Previous computational studies suggested that the catalytic activity of Pt
nanoparticles could be enhanced by a Pt−carbon support interaction. We have recently found that an enhanced electronic
interaction occurs at the interface between an argon-ion (Ar+)-irradiated
glassy carbon (GC) surface and Pt nanoparticles. Here, we report a more than
two-fold increase in specific activity (SA) for the Pt nanoparticles on the Ar+-irradiated
GC substrate compared to that on the non-irradiated GC substrate. The mechanism
of this activity enhancement was investigated by local structure analysis of
the interface. Ar+ irradiation of the carbon support led to the
formation of the Pt−C bonding, thus protecting the deposited Pt nanoparticles